Sewage Farming and Soil Sustainability: A Study on Nutrient Dynamics and Contaminant Accumulation

Sewage farming, the practice of irrigating agricultural land using treated or untreated sewage effluent, has become a prominent alternative in regions facing water scarcity. While this practice can contribute positively to soil fertility through the supply of nutrients like nitrogen, phosphorus, and organic matter, it also poses risks of contamination due to the accumulation of heavy metals, pathogens, and organic pollutants. This study explores the dual effects of sewage farming on soil sustainability by examining changes in soil nutrient profiles and the accumulation of contaminants over time. A combination of field sampling, laboratory analysis, and literature synthesis was employed to assess the impact of sewage irrigation on physicochemical soil properties, nutrient dynamics, and potential risks associated with long-term exposure. The research was conducted in peri-urban agricultural regions where sewage water is commonly used. Parameters analyzed included soil pH, electrical conductivity (EC), organic carbon, total nitrogen, available phosphorus and potassium, and heavy metals such as cadmium (Cd), lead (Pb), chromium (Cr), and zinc (Zn). Results indicated a significant increase in macronutrient levels and organic content, enhancing short-term fertility. However, heavy metal concentrations in sewage- irrigated soils were found to exceed permissible limits in certain areas, suggesting a long-term threat to soil health and food safety. This paper highlights the importance of balancing the benefits and drawbacks of sewage farming. Recommendations include regular monitoring, the use of partially treated effluent, crop rotation strategies, and phytoremediation practices to mitigate adverse impacts. Ultimately, sewage farming can be a viable component of sustainable agriculture if managed scientifically and regulated effectively.