Study On The Comprehensive Treatment Scheme And Combination Technology Of Black And Smelly Water In Xiaoheli River

Water resources is an important part of urban landscape,it is essential part of human life and production,when the water is polluted and more than water selfpurification ability,the urban water body black smelly phenomenon,can cause massive death of aquatic plants,plankton decrease in water,water ecological balance was broken,serious water landscape function is lost,this will make the shortage of water resource is more serious,destruction of the ecological city,reduce the happiness of people's lives.Black and smelly water body will affect urban economic development and residents' life,so it is urgent to regulate black and smelly water body.According to the cause,scope and degree of black and smelly water,the treatment plan should be put forward.This study analyzes and evaluates the level of black and smelly pollution in the Xiaoheli River Basin of Hegang City through preliminary field investigation and water quality detection.To identify and check the types and sources of pollutants that cause black and smelly,and to establish a list of pollution sources and pollutant discharge in the basin.In this study,the method of "physical adsorption and biological treatment" was used to remove pollutants in water body,and the preparation parameters of magnetic biochar were optimized.Meanwhile,the aerobic MBBR reactor was started and operated to verify the feasibility of the combined process to remove pollutants in black and smelly water body,providing technical basis for the treatment of black and smelly water body pollution in Hegang City.The study drew the following conclusions:Through field investigation and water quality test,the study determined that the Xiaoheli River basin contains 1 heavily black and smelly water body?slime ditch?and 9 slightly black and smelly water bodies.The main pollutants in the basin are COD,NH₄⁺-N and TP,and their total pollutant emissions are 3686.96t/a,285.86t/a and 57.31t/a respectively,seriously exceeding the current water environmental capacity.The analysis of pollutant sources shows that industrial point source pollution and combined overflow are the main sources of pollutant discharge.There are serious organic pollution and sediment pollution in the Xiaoheli River basin,so it is necessary to build a comprehensive treatment scheme for black and smelly water that combines pollution removal,long-term conservation and ecological restoration.In this study,"magnetic modified biochar adsorption and aerobic MBBR combined process" was used to remove black and odorous water pollutants.It was believed that magnetic modified biochar had a better removal effect on raw water COD,and the most economical preparation condition of magnetic modified biochar was determined to be Fe³⁺ and biochar 2:1.After 5 minutes of the adsorption reaction,the COD in raw water was reduced from 330mg/L to about 100mg/L,and the COD removal rate could reach 70%.Magnetic modification could enhance the COD removal effect of biochar and shorten the reaction time.Magnetic modification biochar adsorption could be used as an alternative for emergency treatment of black and odour water.In this study,the simulated magnetic modified biochar adsorption effluent was used to start and run the MBBR reactor,and the removal efficiency of NH₄⁺-N reached more than 90% after running for 34 d.The combined process can be used as a feasible technical scheme for the removal of pollutants in black and odorous water bodies and provide technical support for the construction of black and odorous water bodies.