PERFORMANCE AND CARBON EMISSION ANALYSIS OF DECENTRALIZED INTEGRATED WASTEWATER TREATMENT SYSTEMS AROUND THE FAIRY LAKE, CHINA

As a prominent shortcoming of agricultural and rural pollution control, rural sewage treatment faces issues such as poor treatment effects and insufficient maintenance funds.In this study, an innovative household integrated ecological purification system (HIEPS) was developed.This technology integrated solar photovoltaic power generation technology and ecological treatment technology.HIEPS has been applied successfully in a rural decentralized wastewater treatment project near Fairy Lake, in Jiangxi Province, China for more than one year.The comprehensive analysis indicated that the HIEPS had excellent treatment and stability performance, with average removal efficiencies of 88.03%, 88.49%, 84.75%, 69.44%, and 82.85% for chemical oxygen demand (COD), total nitrogen (TN), ammonia nitrogen (NH3N), total phosphorus (TP) and suspended solids (SS), respectively.There were no statistically significant differences in treatment efficiency and effluent concentration in different seasons, suggesting that the HIEPS could adapt to variations in ambient temperatures to maintain a stable treatment effect.In addition, the analysis of the operational benefits showed that the HIEPS remarkably reduced operational costs and contributed to carbon emission reduction.