Eco-Friendly Bioconversion of Sewage Sludge: Strategies for Nutrient Recovery and Pollutant Mitigation
DOI:
https://doi.org/10.55544/jrasb.4.4.5Keywords:
sewage sludge, composting, vermicomposting, BSFL, nutrient recovery, microbial degradation, circular economyAbstract
Sewage sludge (SS), a byproduct of wastewater treatment, is rich in organic matter and nutrients but also harbors heavy metals, pathogens, and organic pollutants. Sustainable disposal and valorization of SS is critical to mitigate environmental and health risks. This review explores the potential of biological composting techniques including thermophilic composting; vermicomposting, co-composting, and black soldier fly larvae (BSFL) treatment as effective, low-cost alternatives to conventional methods such as incineration, pyrolysis, and wet oxidation. These biological approaches significantly reduce pathogenic load and heavy metal mobility, while enhancing nutrient recovery and producing high-quality compost. Microbial degradation during composting facilitates the breakdown of persistent organic pollutants such as PAHs and PCBs. Vermicomposting, in particular, promotes metal bioaccumulation and nutrient enrichment, making the final product suitable for agricultural use. Despite their promise, biological methods face challenges such as slower degradation rates and variability in pollutant removal efficiency. Future research should focus on optimizing composting conditions, microbial consortia, and bulking agents to improve the degradation of persistent pollutants like PPCPs and micro-plastics. Overall, biological composting represents a key strategy in circular waste management, turning SS from an environmental liability into a valuable resource for sustainable agriculture.
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Ashraf, M., Shahzad, S. M., Abid, M., Mehmood, K., Aziz, A., Sarwar, A., ... & Mehran, M. (2022). Ionic Homeostasis and Growth Characteristics of Tomato (Solanum lycopersicum L.) Grown with Municipal Wastewater by Supplying Silicon, Farmyard Manure and Plant Growth Promoting Rhizobacteria. Silicon, 14(18), 12855-12867.
Abduallah, A. M., Ahmed, A. E., Bajaber, M. A., & Alalwiat, A. A. (2023). Evaluation of the antidiabetic effects of methanolic extracts of neem (Azadirachta indica) seeds on streptozotocin-induced Wistar rats. Pakistan Veterinary Journal, 43(4), 792–798.
Abena, A. A., et al. (2019). Fate of organic pollutants during sludge composting. Environmental Pollution, 253, 716–728.
Adamcová, D., Vaverková, M. D., Bartoň, S., Pelcová, P., & Elbl, J. (2016). Potential use of sewage sludge and fly ash in compost production. Environmental Technology, 37(13), 1658–1667.
Adnan, A., Qaswar, M., Farooq, T. H., Hussain, I., Imran, M., & Xu, M. (2022). Sustainable recycling of sewage sludge into biofertilizer through integrated composting and vermicomposting. Chemosphere, 289, 132749.
Ahmad, I. A., Hu, H., Islam, M. S., Fu, Q., Zhu, J., Miao, F., ... & Ali, A. (2025). Simultaneous adsorption of cadmium and arsenic by goethite-modified rice straw-derived biochar in water and soil: interactive ion effects and co-adsorption mechanism. Environmental Monitoring and Assessment, 197(6), 1-17.
Al-Gheethi, A. A., Noman, E., Mohamed, R. M. S. R., & Bala, J. D. (2018). Pathogen reduction and monitoring in sewage sludge: A review. Environmental Monitoring and Assessment, 190(10), 566.
Alidadi, H., Parvaresh, A., Shahmansouri, M. R., & Pourmoghadas, H. (2016). Vermicomposting of sewage sludge using Eisenia fetida. Waste Management, 50, 1–6.
Al-Saeed, F. A., Naz, S., Saeed, M. H., Hussain, R., Iqbal, S., Chatha, A. M. M., Ghaffar, A., & Akram, R. (2023). Oxidative stress, antioxidant enzymes, genotoxicity, and histopathological profile in Oreochromis niloticus exposed to lufenuron. Pakistan Veterinary Journal, 43(1), 160–166.
Alves, D. R., et al. (2019). Influence of microbial dynamics on pollutant degradation in composting. Journal of Hazardous Materials, 378, 120772.
APHA. (2017). Standard methods for the examination of water and wastewater (23rd ed.). American Public Health Association.
Ashraf, M., Qamar, F., Mehran, M., Masood, S., Shahzad, S. M., Javed, M. S., & Azhar, M. T. (2025). Zinc nutrition optimization for better cotton productivity on alkaline calcareous soil. Journal of Cotton Research, 8(1), 14.
Awasthi, M. K., Wang, Q., Wang, Z., Zhao, J., & Ren, X. (2022). Lime stabilization of sewage sludge: A review of mechanisms and sustainable application. Journal of Environmental Management, 316, 115224.
Ayilara, M. S., Olanrewaju, O. S., Babalola, O. O., & Odeyemi, O. (2020). Waste management through composting: Challenges and potentials. Sustainability, 12(11), 4456.
Azizi, A., Zinatizadeh, A. A., & Mohamed, A. R. (2013). Heavy metal removal by earthworms during vermicomposting of sewage sludge. Environmental Engineering Research, 18(2), 101–107.
Balaganesh, M., Kumar, S., & Rajendran, R. (2020). Co-composting for sustainable organic waste management. Journal of Cleaner Production, 268, 122136.
Barthod, J., Rumpel, C., & Dignac, M. F. (2018). Composting with additives to improve organic pollutant degradation. Waste Management, 71, 1–15.
Beffa, T., et al. (1996). Taxonomic and metabolic profiling of thermophilic bacteria in composting. Applied and Environmental Microbiology, 62(5), 1723–1727.
Bertanza, G., Canato, M., & Laera, G. (2017). Wet oxidation: Principles and applications. Environmental Science and Pollution Research, 24(30), 23884–23896.
Bhattacharya, A., & Pletschke, B. I. (2014). Composting dynamics: microbial and chemical perspectives. Applied Microbiology and Biotechnology, 99(3), 1271–1281.
Bian, R., Wang, T., Wang, J., Zhang, M., & Liu, X. (2020). Pyrolysis of sewage sludge for biochar production: A review. Science of the Total Environment, 729, 138995.
Bibby, K., & Peccia, J. (2013). Identification of viral pathogen diversity in sewage sludge by metagenome analysis. Environmental Science & Technology, 47(4), 1945–1951.
Bien, J., Bien, B., & Malijan, G. (2011). Co-composting of sewage sludge and organic waste. Environmental Engineering and Management Journal, 10(4), 467–472.
Bloem, J., et al. (2017). The role of pathogens in sewage sludge: Implications for land application. Journal of Environmental Management, 196, 499–505.
Boulahouat, H. A., et al. (2023). Microbial competition mechanisms in composting. Journal of Hazardous Materials, 448, 130894.
Bustamante, M. A., et al. (2020). Co-composting strategies for biosolids stabilization. Waste Management, 102, 112–123.
Cabañas-Vargas, D., et al. (2013). Pathogen reduction during composting of sewage sludge. Waste Management & Research, 31(10), 975–981.
Cai, Q. Y., et al. (2007). Phthalic acid ester removal during composting of sewage sludge. Waste Management, 27(1), 78–84.
Chen, Y., Huang, L., Gao, J., Zhou, Z., Mehran, M., Geng, M., ... & Huang, J. (2024). Long-term Chinese milk vetch incorporation promotes soil aggregate stability by affecting mineralogy and organic carbon. Journal of Integrative Agriculture.
Chi, Y., et al. (2010). Composting of dewatered sewage sludge with organic waste. Journal of Environmental Sciences, 22(11), 1806–1813.
Cieslik, B. M., et al. (2015). Vermicomposting as a tool for nutrient recycling from sewage sludge. Journal of Cleaner Production, 90, 210–216.
Cieślik, B. M., Konieczka, P., & Namieśnik, J. (2019). Sewage sludge in energy recovery: Review and perspectives. Renewable and Sustainable Energy Reviews, 108, 423–435.
Da Rocha, C., et al. (2016). Helminth eggs in sewage sludge: Resistance and inactivation strategies. Water Research, 103, 110–118.
Delibacak, S., Ongun, A. R., & Güneş, A. (2020). Heavy metal accumulation in soil and food crops irrigated with secondary-treated sewage water under Mediterranean conditions. Environmental Monitoring and Assessment, 192(9), 579.
Diez, C. (2010). PCDD/Fs in sewage sludge: risk assessment and removal. Chemosphere, 81(9), 1152–1160.
Domínguez-Crespo, M. A., et al. (2019). Earthworms as biomonitors in metal-contaminated soils. Ecotoxicology and Environmental Safety, 167, 381–390.
Du, M., et al. (2019). Microbial and enzymatic strategies for DEHP biodegradation. Journal of Environmental Management, 246, 810–818.
Dumontet, S., Dinel, H., & Baloda, S. B. (1999). Pathogen reduction in sewage sludge by composting and other biological treatments: A review. Biological Agriculture & Horticulture, 16(4), 409–430.
Dutta, A., et al. (2023). Microbial degradation of pathogens during composting. Bioresource Technology, 366, 128218.
Fang, D., & Zhou, L. (2007). Bioleaching of heavy metals from sewage sludge using Acidithiobacillus spp. Chemosphere, 67(6), 1030–1035.
Fatima, I., Fatima, A., Shah, M. A., Farooq, M. A., Ahmad, I. A., Ejaz, I., ... & Hani, U. (2024). Individual and synergistic effects of different fertilizers and gibberellin on growth and morphology of chili seedlings. Ecological Frontiers, 44(2), 275-281.
Fei-Baffoe, B., Nyankson, E. A., Ofosu, E. A., Awuah, E., & Darko, A. (2016). Characterization of faecal sludge for agricultural application in Accra, Ghana. International Journal of Environmental Science and Technology, 13(10), 2531–2542.
Fijalkowski, K., et al. (2017). Pathogens in sewage sludge. Science of The Total Environment, 599–600, 1741–1751.
Frąc, M., & Jezierska-Tys, S. (2011). Fungi in sewage sludge: A neglected group of pathogens. Polish Journal of Environmental Studies, 20(6), 1403–1410.
Frąc, M., et al. (2017). Fungal diversity and pathogen presence in treated sewage sludge. Applied Soil Ecology, 119, 289–297.
Fu, X., et al. (2013). Removal efficiency of PAHs and PAEs during composting. Bioresource Technology, 148, 214–220.
Gai, C., Dong, Y., & Zhang, X. (2023). Advanced pyrolysis technology for sewage sludge valorization. Renewable Energy, 210, 878–889.
Gao, X., Liu, Y., & Yang, Z. (2020). Organic amendments in soil improvement. Environmental Pollution, 267, 115624.
Giagnoni, L., Pastorelli, R., Gallo, M., & Nannipieri, P. (2020). The effect of co-composting on microbial activities and quality of organic fertilizers. Bioresource Technology, 297, 122408.
Gibson, R., et al. (2008). Persistence of PCBs during sludge composting. Environmental Science & Technology, 42(10), 3565–3571.
Gong, M. (2013). Heavy metals and organic pollutants in sewage sludge. In W. Wang, J. C. Yang, & P. W. Zhang (Eds.), Environmental Protection and Sustainable Ecological Development (pp. 197–202). Springer.
González-Abradelo, D., et al. (2019). Microbial strategies for PAH and PAE degradation. Environmental Science and Pollution Research, 26(8), 8128–8139.
Grgas, D., Starčević, M., & Đermić, E. (2023). Composting sewage sludge with food waste and green waste: Nutrient recovery and heavy metal reduction. Environmental Technology & Innovation, 30, 103201.
Guo, H., et al. (2020). PAH biodegradation and microbial consortia in sewage sludge composting. Science of the Total Environment, 746, 141285.
Guo, R., Li, G., Jiang, T., Schuchardt, F., Chen, T., Zhao, Y., & Shen, Y. (2020). Effect of green waste on polycyclic aromatic hydrocarbons reduction during sewage sludge composting. Journal of Environmental Sciences, 91, 222–230.
Guo, Z., Yu, L., Wang, C., Zhang, Y., & Liu, J. (2023). Sewage sludge management in China: Current practices and future perspectives. Journal of Environmental Management, 325, 116490.
Gurtler, J. B., et al. (2018). Heat inactivation of pathogens during composting. Compost Science & Utilization, 26(2), 100–108.
Haider, S., Bibi, K., Munyaneza, V., Zhang, H., Zhang, W., Ali, A., ... & Ding, G. (2024). Drought-induced adaptive and ameliorative strategies in plants. Chemosphere, 143134.
Harrison, E. Z., Oakes, S. R., Hysell, M., & Hay, A. (2006). Organic chemicals in sewage sludges. Science of the Total Environment, 367(2–3), 481–497.
He, Z. L., et al. (1995). Distribution of heavy metals in compost. Environmental Pollution, 89(1), 37–44.
He, Z. L., et al. (2020). Heavy metal stabilization in compost. Environmental Pollution, 266, 115216.
Houillon, G., & Jolliet, O. (2005). Life cycle assessment of sewage sludge treatment. International Journal of Life Cycle Assessment, 10(5), 336–345.
Huang, Y., et al. (2018). Pathogen diversity in activated sludge. Water Research, 137, 131–139.
Ikram, M., Mehran, M., Minhas, A., ur Rehman, H., Bakash, M. Z. M., Khan, M. W., ... & Rasheed, H. (2025). C: N Ratio and Its Importance in Developing Effective Bioenergy Crops. In Forage Crops in the Bioenergy Revolution: From Fields to Fuel (pp. 259-276). Singapore: Springer Nature Singapore.
Ikram, M., Mehran, M., ur Rehman, H., Ullah, S., Bakhsh, M. Z. M., Tahira, M., ... & El Sabagh, A. (2024c). Mechanistic Review of Melatonin Metabolism and Signaling Pathways in Plants: Biosynthesis, Regulation, and Roles under Abiotic Stress. Plant Stress, 100685.
Ikram, M., Minhas, A., Al-Huqail, A. A., Ghoneim, A. M., Mahmood, S., Mahmoud, E., ... & Ali, W. (2024b). Promoting tomato resilience: effects of ascorbic acid and sulfur-treated biochar in saline and non-saline cultivation environments. BMC Plant Biology, 24(1), 1053.
Ikram, M., Rauf, A., Rao, M. J., Maqsood, M. F. K., Bakhsh, M. Z. M., Ullah, M., ... & Tahira, M. (2024a). CRISPR-Cas9 based molecular breeding in crop plants: a review. Molecular Biology Reports, 51(1), 227.
Jain, M. S., Kalamdhad, A. S., & Kazmi, A. A. (2019). A review on sewage sludge treatment and management using various thermal methods. Bioresource Technology Reports, 7, 100243.
Jiang, T., et al. (2021). Composting strategies for improving organic pollutant degradation. Journal of Environmental Management, 298, 113550.
Johansson, M., Nilsson, J., & Karlsson, M. (2018). Wet oxidation: A low-emission option for sludge treatment. Chemical Engineering Journal, 348, 725–732.
Kabak, H., et al. (2022). Pathogen inactivation mechanisms during composting. Environmental Science and Pollution Research, 29(8), 11943–11955.
Kacprzak, M., Neczaj, E., Fijałkowski, K., Grobelak, A., Grosser, A., Worwag, M., ... & Singh, B. R. (2017). Sewage sludge disposal strategies for sustainable development. Environmental Research, 156, 39–46.
Kumar, R., Bharti, A., & Sharma, V. (2023). Earthworm-mediated vermicomposting of sewage sludge: Transformation, microbial diversity and heavy metal immobilization. Environmental Technology & Innovation, 30, 103069.
Lalander, C., Diener, S., Zurbrügg, C., & Vinnerås, B. (2019). Effects of feedstock on larval development and process efficiency in BSFL composting. Waste Management, 87, 489–500.
Lazzari, L., et al. (2000). Fate of PAHs during organic waste composting. International Biodeterioration & Biodegradation, 45(3), 157–162.
Li, J., Wang, X., Sun, A., Li, H., Luo, Y., He, F., Huan, C., Zhou, X., Li, C., Zhang, B., & Yi, K. (2023). Comparative transcriptomic analysis of spermatozoa from Xiangxi and Simmental bulls under heat stress: Implications for fertility prediction. Pakistan Veterinary Journal, 43(1), 184–188.
Li, R., Zhang, L., Ma, J., & Zhao, L. (2018). Bioleaching of heavy metals from sewage sludge. Bioresource Technology, 261, 490–496.
Li, W., Liang, H., & Liu, J. (2013). Reduction of ammonia emissions during composting by adding dicyandiamide and phosphogypsum. Bioresource Technology, 133, 116–123.
Li, Y., Zhao, L., & Wang, Y. (2023). Risk assessment of heavy metal accumulation under long-term sludge application. Ecotoxicology and Environmental Safety, 249, 114376.
Li, Z., et al. (2020). Microbial degradation of PAEs during composting. Science of the Total Environment, 740, 139904.
Liang, C., Wang, X., & Wang, G. (2018). Effects of alkaline stabilization on sewage sludge characteristics. Waste Management, 79, 763–770.
Liew, R. K., Kalderis, D., & Foo, K. Y. (2022). Sewage sludge as a resource: Circular economy strategies and BSFL valorization. Renewable and Sustainable Energy Reviews, 160, 112262.
Liew, R. K., Nam, W. L., Su, M. H., Peng, W., Lin, Y. F., & Lam, S. S. (2021). Upcycling sewage sludge to bioenergy and biochar: A review of technological advances and future challenges. Renewable and Sustainable Energy Reviews, 135, 110223.
Liew, R. K., Phang, X. Y., Su, M. H., Tsang, Y. F., Sonne, C., Peng, W., & Lam, S. S. (2022). A review on sewage sludge pyrolysis and gasification technologies. Energy, 248, 123620.
Lim, S. L., Wu, T. Y., & Clarke, C. (2016). Treatment and biotransformation of sewage sludge into a beneficial biofertilizer. Bioresource Technology, 211, 1–15.
Liu, H., et al. (2019). Relationship between microbial communities and pollutant degradation. Environmental Science and Pollution Research, 26(13), 12958–12969.
Liu, X., Zhang, Y., & Liu, L. (2019). Role of microbes in sewage sludge treatment. Environmental Technology, 40(10), 1321–1332.
Liu, Z., Wang, Q., & Zhao, X. (2021). Heavy metal stabilization in biochar. Environmental Pollution, 273, 116453.
Lü, F., et al. (2021). Microbial activity in thermophilic SS composting. Waste Management, 124, 84–92.
Lu, M., et al. (2019). Biodegradation of PAHs in composting using microbial inoculants. Bioresource Technology, 293, 122061.
Lu, Q., He, Z. L., & Stoffella, P. J. (2021). Land application of biosolids. Agronomy, 11(5), 935.
Ma, X., et al. (2020). Comparative removal of organic pollutants during sludge composting. Journal of Hazardous Materials, 385, 121525.
Maier, R. M., et al. (2001). Biosurfactant-mediated metal recovery. Applied and Environmental Microbiology, 67(7), 3247–3251.
Malekian, S., Alavi, N., & Ghaffari, H. R. (2020). Heavy metals in soil after long-term SS application. Environmental Monitoring and Assessment, 192(11), 699.
Manca, L., Carlon, E., & Benedetti, A. (2020). Assessment of heavy metals and nutrient contents in composted sewage sludge for agricultural use. Environmental Technology, 41(17), 2242–2252.
Manual, C. D. (2023). Antimicrobial compounds in compost. Composting International, 11, 33–41.
Marin, J. A., et al. (2015). Pathogen reduction in wastewater sludge composting. Waste Management, 42, 94–100.
Mawede, M. (2023). A review on co-composting of sewage sludge: Progress, benefits, and challenges. Waste Management & Research, 41(3), 378–386.
Medeiros, J., & Daniel, L. (2018). Protozoan and helminth occurrence in sludge. Parasitology International, 67(1), 52–60.
Mehran M, Ikram M, Ghoneim AM, Alotaibi MO, Ghafar S, Rafique MT, Ahmad IA, Haider S, Safiullah D and Shah MN, 2025b. Plant health, soil structure and fertility: developing a sustainable future. In: Kausar R, Nisa ZU, Jamil M and Bashir I (eds), Integrated Health and Sustainability: Plants, Wildlife, and Genetic Resilience. Unique Scientific Publishers, Faisalabad, Pakistan, pp: 144-152.
MEHRAN, M., ASHRAF, M., SHAHZAD, S. M., SHAKIR, M. S., AZHAR, M. T., AHMAD, F., & ALVI, A. (2023). Growth, yield and fiber quality characteristics of Bt and non-Bt cotton cultivars in response to boron nutrition. Journal of Cotton Research, 6(1), 1.
Mehran, M., Huang, L., Geng, M., Gan, Y., Cheng, J., Zhu, Q., ... & Mustafa, A. (2025a). Co-utilization of green manure with straw return enhances the stability of soil organic carbon by regulating iron-mediated stabilization of aggregate-associated organic carbon in paddy soil. Soil and Tillage Research, 252, 106624.
Meng, J., et al. (2014). Characterization of phthalates in sewage sludge. Environmental Toxicology and Chemistry, 33(2), 412–419.
Menoni, L., & Bertanza, G. (2019). Techno-economic evaluation of wet oxidation. Journal of Environmental Chemical Engineering, 7(3), 103148.
Meulepas, R. J., et al. (2015). Bioleaching processes for sludge remediation. Journal of Hazardous Materials, 285, 474–482.
MINHAS, A., SAEED, M. S., EHSAN, A., MURTAZA, G., AKRAM, M., MEHRAN, M., ... & SYED, R. K. I. A. (2024). RESPONSE OF INTEGRATED USE OF HUMIC ACID AND CHEMICAL FERTILIZER ON GROWTH AND YIELD OF RICE CROP (ORYZA SATIVA L.) IN CALCAREOUS SOIL. Pak. J. Bot, 56, 3.
Munoz, M., et al. (2018). Changes in PCDD/F levels during SS composting. Chemosphere, 206, 456–463.
Murtaza, G., Sheryar, A., Hayat, H. S., Bukhari, A., Shaheryar, M., Ghaffor, K., ... & Akram, H. M. B. (2022). Effect of Nitrogen and Phosphorus Application Rate on Peanut (Arachis Hypogaea L.) Phenology, Yield and Soil Nutrient Status. Journal of Arable Crops and Marketing, 4(2), 143-153.
Nahar, M. S., & Shahadat, M. (2021). Sustainable sludge management in developing countries: A review. Environmental Challenges, 4, 100212.
Naz, S., Arshad, A., Shoukat, A., Shaheen, C., Aslam, R., Nawaz, A., ... & Ahmad, I. A. (2025). Innovative Approaches in Wastewater Management: A Comprehensive Review. Int. J. Curr. Microbiol. App. Sci, 14(03), 140-164.
Naz, S., Arshad, A., Shoukat, A., Shaheen, C., Aslam, R., Nawaz, A., ... & Ahmad, I. A. (2025). Innovative Approaches in Wastewater Management: A Comprehensive Review. Int. J. Curr. Microbiol. App. Sci, 14(03), 140-164.
Neklyudov, A. D., et al. (2021). Thermal phases and sludge composting. Applied Biochemistry and Microbiology, 57(2), 185–191.
Nemet, I., et al. (2021). Composting dynamics and microbial succession in organic waste. Bioresource Technology, 320, 124354.
Nuagh, R. K., Fei-Baffoe, B., & Awuah, E. (2020). Evaluation of nutrient and heavy metal concentrations in composted faecal sludge for reuse in agriculture. Heliyon, 6(5), e04021.
Oleszczuk, P. (2012). Toxicity of composts from sewage sludges evaluated by chemical and biological tests. Ecotoxicology and Environmental Safety, 80, 102–108.
Ozaki, N., et al. (2017). PAH fate during prolonged composting of food and industrial wastes. Environmental Technology, 38(24), 3232–3241.
Pakou, C., et al. (2009). Biodegradation of DEHP in manure composting systems. Environmental Science and Pollution Research, 16(3), 261–268.
Pandey, P. K., et al. (2016). Pathogen inactivation during composting. Waste Management, 51, 115–123.
Pathak, A., et al. (2020). Advances in bioleaching technologies for heavy metal removal. Reviews in Environmental Science and Bio/Technology, 19(2), 389–407.
Poluszynska, J., et al. (2017). Removal of PAHs during sludge composting with sawdust. Environmental Science and Pollution Research, 24(30), 23897–23906.
Qiao, C., et al. (2019). Composting dynamics of pig manure and SS. Science of the Total Environment, 667, 150–157.
Rahim, H. U., Ahmad, S., Surendran, U., Aslam, I., Uddin, M., Khan, Z., ... & Ahmad, I. A. (2025). Artificial crop irrigation and microplastic pollution. In Microplastics in Agriculture and Food Science (pp. 147-156). Academic Press.
Ramirez, N., et al. (2008). Distribution of PCBs in municipal sludge composts. Environmental Science and Technology, 42(10), 3561–3567.
Ratanatamskul, C., Sillapapiromsuk, S., & Maneewan, K. (2014). Potential use of sewage sludge compost in agriculture: Evaluation of maturity indexes. International Journal of Environmental Science and Development, 5(2), 200–203.
Rorat, A., et al. (2017). Comparison of bulking agents in sludge composting. Waste Management, 68, 716–725.
Saleem, M., et al. (2021). Bioleaching for heavy metal removal in sewage sludge. Environmental Technology & Innovation, 23, 101651.
Sharma, J., Suthar, S., & Singh, S. (2021). Vermistabilization of sewage sludge: Impact on enzyme activities, heavy metal bioavailability, and soil health. Ecotoxicology and Environmental Safety, 208, 111770.
Sharma, R. K., et al. (1997). Distribution of heavy metals in composts. Environmental Monitoring and Assessment, 43(1), 135–144.
Siebielska, I., & Sidelko, G. (2015). Distribution of PCBs in composted municipal waste. Ecological Chemistry and Engineering S, 22(3), 429–439.
Singh, J., & Kalamdhad, A. S. (2018). Effects of composting on heavy metal stabilization. Bioresource Technology, 250, 653–661.
Song, G., Liu, S., & Yu, J. (2022). Soil response to biosolid amendments. Applied Soil Ecology, 170, 104250.
Sunar, N. M., Zakaria, M. R., & Kamyab, H. (2014). Thermophilic composting for sewage sludge treatment. Clean – Soil, Air, Water, 42(3), 258–263.
Sung, W. J. (2002). Biodegradation of PAHs by thermophilic bacteria. Chemosphere, 49(6), 627–632.
Suthar, S., et al. (2014). Vermicomposting and earthworm-microbe interaction. Environmental Science and Pollution Research, 21(3), 1619–1627.
Ullah, M., Rasool, F., Khan, N., Ali, S., & Sheikh, A. A. (2023). Antibiotic resistance and its gene profile in Escherichia coli isolated from diseased farm-raised carps in Punjab, Pakistan. Pakistan Veterinary Journal, 43(3), 470–476.
Veeresh, H., Tripathy, S., Chaudhuri, D., & Hart, B. R. (2003). Chemically enhanced primary treatment of wastewater using modified clays. Environmental Technology, 24(3), 327–336.
Wainaina, S., et al. (2020). Composting processes in developing countries. Bioresource Technology, 299, 122564.
Wang, L., Zhang, Y., & Liu, Q. (2019). Sludge incineration and reuse. Journal of Cleaner Production, 210, 312–320.
Wang, S., Chen, M., & Liu, C. (2020). Sludge wet oxidation: Advances and challenges. Environmental Research, 185, 109467.
Wang, X., et al. (2015). Carbon and nitrogen dynamics in SS composting. Waste Management, 40, 38–47.
Wang, X., Zhang, Y., Mao, J., Li, Y., Deng, Q., Jia, Z., Tang, M., Zhang, X., & Du, L. (2023). Oestrogen receptors ERα, ERβ and GPER mediate the activation of AMPK and the inhibition of the inflammatory signaling pathway TLR4/NFκB in dairy cow neutrophils. Pakistan Veterinary Journal, 43(1), 153–159.
Wang, Z., et al. (2022). Organic pollutant removal during microbial composting of sludge. Journal of Environmental Chemical Engineering, 10(3), 107369.
Wen, Y., et al. (2013). Bioleaching of heavy metals from sewage sludge. Environmental Science and Pollution Research, 20(4), 2418–2425.
Wong, J. P. K., et al. (2020). Nutrient loss in bioleaching. Bioresource Technology, 307, 123198.
Yang, C., et al. (2016). Metal removal using biosurfactants from Burkholderia sp. Journal of Hazardous Materials, 303, 30–38.
Yang, X., et al. (2017). Microbial composition and contaminant degradation in SS compost. Science of the Total Environment, 607–608, 1184–1191.
Yang, Y., et al. (2013). Characterization of composting stages and pollutant removal. Environmental Pollution, 179, 135–143.
Yang, Z., Liu, X., & Zhang, Y. (2022). Recycling incinerated sludge ash. Renewable and Sustainable Energy Reviews, 161, 112326.
Yasir, M., Khan, A. A., Kazmi, A. A., & Al-Mutairi, Z. (2022). Risk assessment of heavy metals in sewage sludge for agricultural applications. Environmental Monitoring and Assessment, 194, 101.
Yu, Y., Tan, X., & Chen, Y. (2022). Emission control in sludge pyrolysis. Journal of Hazardous Materials, 431, 128539.
Zennegg, M., et al. (2013). Long-term trends of PCBs in sludge. Chemosphere, 91(6), 785–790.
Zhang, H., Zhang, S., & Xu, D. (2016). Characteristics of heavy metals and organic pollutants in sewage sludge: A case study in China. Environmental Earth Sciences, 75, 1039.
Zhang, L., Zhang, S., Christie, P., & Li, X. (2009). Micronutrient concentrations in sewage sludge from 12 wastewater treatment plants in China and implications for agricultural use. Waste Management, 29(2), 547–554.
Zhang, Y., Wang, Y., Peng, Y., & Wang, S. (2015). Wastewater sludge in China: Generation, characteristics, and management. Journal of Environmental Management, 157, 1–7.
Zhang, Y., Wu, M., & Gao, H. (2023). Incineration residues and environmental risk. Journal of Environmental Management, 336, 117604.
Zhang, Y., Zhou, Y., & Wang, X. (2020). Optimization of bioleaching for heavy metals. Environmental Technology & Innovation, 19, 100918.
Zhao, X., Li, Q., & Wang, T. (2021). Assessment of SS amendments in agriculture. Ecotoxicology, 30(4), 728–739.
Zhao, Y., et al. (2018). Pathways and microbial degradation of PAEs. Environmental Pollution, 243, 1263–1271.
Zheljazkov, V. D., & Warman, P. R. (2004). Compost use and metal availability in soils. Compost Science & Utilization, 12(1), 44–53.
Zheng, L., Hou, Y., Li, W., Yang, S., & Yu, Z. (2022). Black soldier fly larvae for organic waste treatment: From laboratory to industrial scale. Science of The Total Environment, 837, 155775.
Zheng, W., et al. (2018). Aeration effects on microbial communities and pollutant removal. Bioresource Technology, 253, 292–300.
Zhou, X., et al. (2022). Biodegradability of organic materials in SS composting. Waste Management, 136, 62–70.
Zhu, W., Li, X., & Zhang, D. (2021). Effects of maize straw as bulking agent on thermophilic composting of sewage sludge. Waste Management, 120, 559–567.
Zigmontiene, A., & Sereviciene, V. (2023). Comparison of nitrogen retention and ammonia emission in vermicomposting and traditional composting. Environmental Monitoring and Assessment, 195, 457.
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Copyright (c) 2025 Samra Naz, Ammara Shoukat, Abiha Arshad, Rimsha Aslam, Chanda Shaheen, Samra Saeed, Rehana Latif, Asma Zafar, Sonia Ihsan, Muhammad Farhan Qadir, Muhammad Mehran, Sharjeel Haider, Iftikhar Ali Ahmad
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