The comprehensive influence of septic tank on urban drainage system from water quality,water quantity and hydrogen sulfide emission
The residential area in the main urban area of Chongqing was selected for field investigation.The sewage quality,flow rate,H2S and other indicators of the inlet and outlet of the septic tank in the resi-dential area were measured,and the impact of the abolition of the septic tank on the drainage system and the surrounding environment was analyzed.The result showed that①from the flow point of view,accord-ing to the results of the community flow,there was little difference in the flow before and after the septic tank on weekdays or weekends,and the cancellation of the septic tank had little effect on the total amount of sewage entering the municipal pipe network;②from the water quality,the septic tank had a higher re-duction rate for COD,BOD5 and SS.The average decline rate of COD/TN was 43%.The average decline rate of COD/TP was 38%;③ according to the measured results of H2S in the community,the average concentration of H2S in the septic tank was 8.20 mg/m3,and the average concentration of H2S in the sewage pipeline was 2.70 mg/m3.Canceling the septic tank could effectively reduce the risk of odor emis-sion that could be obviously perceived by human senses,and had a positive effect on improving the air quality of the community.
NETL
NSTL
万方数据
