en عمومى General مقاله اصیل Original Article <div style="text-align: justify;">Background: This study aimed to explore the feasibility of producing compost fertilizer through co-composting solid waste materials and dewatered sludge from the domestic wastewater treatment plant (WWTP) at Gole-Gohar Mining and Industrial Company, employing the windrow method with various treatments.<br> Methods: In this experimental study, three windrow piles were established, each with a volume of 0.3 m3 and weight ratios of 1:2 (food waste:dewatered sludge) and 1:4 (garden waste:dewatered sludge), along with a control group without sewage sludge (SS) modification. The parameters influencing the compost production process, including temperature, moisture content, volatile solids, pH, electrical conductivity (EC), organic carbon, organic matter, C/N ratio, heavy metals, density, alkalinity, phosphorus content, microbial load, cations and anions were examined.<br> Results: The results showed that the concentrations of heavy metals and pH levels in all three compost piles fell within acceptable ranges. EC values fluctuated between 2 and 6 mS/cm across all piles. The C/N ratio decreased, with the pile containing sewage treatment plant sludge and food waste achieving the optimal range of 15-25. The germination index (GI) for lettuce, cress, and mung bean seeds was higher than the standard in all three piles. The produced compost was classified as Class A in terms of microbial load.<br> Conclusion: Overall, the physicochemical parameters of the produced composts met standard limits. According to the results, compost-containing food waste emerged as the most suitable for agricultural use.</div> Sludge, Solid waste, Compost, Heavy metals, Soil 1 12 http://ehemj.com/browse.php?a_code=A-10-1-384&slc_lang=en&sid=1 Zahra Parvar zahraparvar7493@gmail.com 100319475328460020702 0009-0008-0731-7365 No Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran Hoda Amiri hoda.amiri@gmail.com 100319475328460020703 100319475328460020703 No Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran Alireza Nasiri nasiri_a62@yahoo.com 100319475328460020704 100319475328460020704 No Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran Majid Hashemi mhashemi120@gmail.com 100319475328460020705 100319475328460020705 Yes Corresponding author: Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran Mohsen Medipour mmehdipoor@yahoo.com 100319475328460020706 100319475328460020706 No Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran Mohsen Pourafshar mohsentarzanan@gmail.com 100319475328460020707 0009-0004-0609-0526 No Department of Environmental Engineering, Faculty of Environment, University of Tehran, Tehran, Iran