THE EFFECT OF THE HYDRAULIC RETENTION TIME AND TEMPERATURE ON THE PERFORMANCE OF UP-FLOW ANAEROBIC..

Improper sewage treatment in big cities and rural communities contains organic matter and nutrients substrates that can significantly influence lakes and streams by speeding up the eutrophication process, which degrades the water quality of freshwater bodies. The use of an up-flow anaerobic filter (UAF) reactor for the treatment of rural home sewage is now well documented as a cost-effective and efficient process reactor, particularly for the removal of organic matter and nutrients. The effect of hydraulic retention duration and temperature on the effectiveness of an up-flow anaerobic filter reactor treating low-strength rural home sewage is the subject of this paper. The wastewater was collected from a sewage manhole at Southeast University's Taihu Lake Environmental Engineering Research Center in Wuxi, China. In a laboratory setting, two rounds of experimental operations were carried out. The UAF reactor systems consisted of two polyvinyl chloride (PVC) columns with a total capacity of 200 L, each of which was used as an anaerobic column. With an internal diameter of 0.2 m and a height of 2 m, the UAF reactors were connected in a series. Non-woven fabric filter material with a length of 2.5 m, a width of 50 mm, a surface area of 150 m2/m3, a porosity of 97 percent, and an effective volume of 90 L was used to fill the columns. The influence of hydraulic retention period (1, 2, 3, and 4 days) and temperature (31.6, 32.95, 33.7, 16.4, 14.8 and 10.2°C) on organic and nutrient removal was experimented with and assessed during the experimental operations. The pH level was kept between 7.2 and 7.5. The optimum hydraulic retention time (HRT) and temperature in UAF were three days and 33.7°C, respectively, with maximum average chemical oxygen demand (COD) and total nitrogen (TN) removal of 91 percent and 65 percent. The trials demonstrated that when the reactor's HRT and temperature increased, so did its performance. According to the findings, the UAF treatment of diverse biomass substrates from low-strength rural residential sewage provides a range of benefits for wastewater management and water pollution prevention.

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