Study On Purification Of Domestic Sewage By Water Hyacinth In Dynamic And Static Mode

Since the enrollment expansion of colleges and universities,the admission rate of the provinces across the country has been rising every year.The number of university students is also increasing,and the amount of campus sewage produced is also increasing rapidly.Especially in the campuses in the suburbs,due to the lagging construction of the surrounding sewage pipe network,A large amount of domestic sewage is discharged into the surrounding water environment without effective treatment,causing eutrophication of surrounding water bodies.Campus sewage is characterized by large amounts of water and low concentrations of pollutants.Suitable for the purification of aquatic plants.In response to the problem of eutrophication of water bodies,researchers from various countries have done a lot of research on improving water quality,reducing the degree of eutrophication of water bodies,and restoring and improving the water environment.As a rapidly growing floating plant,water hyacinth has obvious effects on reducing the concentration of pollutants in water and reducing the degree of eutrophication.Adopting the method of control and raising water hyacinth to purify the campus domestic sewage can not only purify the campus sewage,but also save the sewage treatment cost.This experiment used water hyacinth to purify the static and dynamic sewage,determine the physical and chemical indicators of water and water hyacinth biomass,the results show that the static water experiments in the experiment of water hyacinth in the removal of water turbidity 75.30% to 93.10% The removal rate of total nitrogen is 97.44%-98.45%;the removal rate of total phosphorus is 98.72%-99.89%;the removal rate of NH4+-N is 86.44%-93.32%;the removal rate of COD of water hyacinth in each experimental tank is respectively For-12.23%,49.49%,-130.88%,39.36%,53.80%,and 5.50%,the removal rate of COD in the experimental cylinders of water hyacinths differs greatly and the effect is not good.In the eutrophic water body,the water hyacinth grows well and the fresh weight of the water hyacinth in the experimental tanks after the experimental culture is increased is 1.78 to 2.54 times the initial fresh weight.Water hyacinth can be used as an auxiliary plant species for subsequent reprocessing of domestic sewage discharged from a sewage outlet.The water hyacinth can grow normally under different pH gradients,and has good purification effect on turbidity,total nitrogen,total phosphorus and ammonia nitrogen in water.Under neutral conditions,water hyacinth shows better performance on total nitrogen and ammonia nitrogen.Ground removal effect;water hyacinth showed better removal rate of total nitrogen under acidic conditions.Water hyacinth has a certain ability to remove COD in water.Under different pH conditions,the removal effect of water hyacinth on COD is quite different.In the high alkalinity condition,the growth of water hyacinth was inhibited,which showed that the leaves were yellow,the plants were relatively small,and some plants died.Dynamic experimental results show that in the flowing water,water hyacinth grows normally and has a good removal rate of turbidity,total nitrogen,and ammonia nitrogen.In the dynamic experiment,the CODcr content of the water drops significantly,which may be a flowing water body.Increase oxygen content in water,promote the growth and reproduction of microorganisms,and accelerate the decomposition of organic matter in water.Water hyacinth roots have the highest microbial diversity and are distributed in the species of Comamonadaceae,Acidibacter,Kineoporia etc.These bacteria have the ability to decompose proteins and take up acidic substances in the surrounding environment.These bacteria may have certain links with the growth and purification of water hyacinths.To provide a theoretical basis for the further use of water hyacinth-microorganism complex to purify eutrophic water bodies.