Pollution Statusand Treatment Scheme Of A Black And Odorous Water Body In A City(Central) Urban Area

As an extreme phenomenon of water pollution,black and odorous water is not only causes ecological damage,affects the lives in physical and mental health of residents seriously,but also restricts the development of the city seriously,which has aroused widespread attention.This paper summarizes the causes and pollution status of black-odor water body at home and abroad,as well as a variety of technologies for the treatment of black-odor water body.Emphatically investigates and analyses the pollution status of a black-odor water body in the downtown area of Jiujiang city(central),conducts the cause analysis and odorous grade evaluation,and discusses the comprehensive treatment scheme.The main conclusions are as follows:(1)From May to December in 2016,A city(central),black and odorous water quality present situation of pollution factors DO,COD,NH3-N,TP and TN average of 7.6 mg/L,36 mg/L,43.66 mg/L,0.098 mg/L and 51.9 mg/L respectively,which could not satisfy the standard of surface water environmental quality(GB3838-2002)IV class,are overweight.(2)The water quality of a monitoring point in A city(central)has a great difference in time.From August to November,the water is seriously polluted,with ammonia nitrogen and total nitrogen exceeding the standard.The total nitrogen concentration in October is 66.7 mg/L,and the lowest in August is the,which is 37 mg/L,which belongs to the severe black-odor water.In the rest of the index slightly lower,but the total nitrogen is more serious than V class water indicators,belongs to the mild black and odorous water body.(3)The cause of formation of a black and odorous water body in A city(central)is mainly due to exogenous pollutants input(such as industrial wastewater,domestic sewage,garbage and non-point sources into).The environmental factors causing the black and odorous phenomena mainly include: organic pollutants,nitrogen,phosphorus and other pollutants,oxygen deficiency in water body,poor fluidity of water body,etc.Iron and manganese sulfide is usually the main cause of black and odor in water.However,due to lack of previous knowledge,the study did not detect the iron and manganese,remains to be further.(4)The main treatment measures proposed in this paper for a black and odorous water body in A city(central)include: sewage treatment plant,garbage disposal,ecological embankment and along the dike artificial management,ecological dredging and periodic cleaning of aquatic plants,ecological floating island,artificial and ERT technique of increasing oxygen,water or recycled water supply,algae control,composite water purification engineering,ecological floating bed project,filter feeding fish control algae reproduction,micro-ecosystem reduce sediment,improve water self-purification function.