Removing Ammonium Nitrogen From Wastewater By Immobilize Nitrobacteria With Chitosan And Alginate

On the condition of limited fishery resources and cultivable water, the sustainable development of fisheries depends on increasing intensity of breed aquatics to elevate the output of per unit water. The high concentration of total ammonia nitrogen is derived from the high intensity of breed aquatics, high rates of fish excretion and feed loading .It is a harmful environment factor that can restrict fish products and cause water eutrophication. So it becomes more necessary to remove the ammonium nitrogen from breed aquatics water.In order to reduce the harm of ammonia nitrogen pollution, the microorganism is adopted to control water quality, but that is easy affected by outside environment and has bad ability to resist environment impact. Once damaged, system was hard to restore. The disposal effect of the method is unsteady. The microorganism technique is advantageous to not only fix advantage germ, increase decompose efficiency of difficult decomposed organic matter, also maintain the high creature density in the equipment, be easy to separate solid from liquid. So we treat NH₄⁺-N in fishery wastewater by immobilized microorganisms technology.This paper mainly introduced immobilized microorganisms technology, choosing of immobilized carriers, the methods used for immobilized microorganisms and nitration mechanism of nitrobacteria. It introduced uniformity design method and math model. The immobilized microbial beads were made from entrapping nitrobacteria with chitosan and alginate as entrapment carrier to treat NH₄⁺-N in fishery wastewater.This paper is aimed to find out the best conditions of the immobilized microbial beads crosslinked by glutaradehyde to treat NH₄⁺-N in fishery wastewater, which is made from entrapping nitrobacteria with chitosan and alginate as entrapment carrier. The experiment results indicated thatl.5%～1.7% chitosan, alginate 3%, CaCl₂ 4.6%～5%, glutaradehyde 1.1%～1. 3%, nitrobacteria 5～5.3mL were the optimal conditions. The means has little toxicity to nitrobacteria, stable quality, easy operation, low price, and high mechanical strength . The NH₄⁺-N removal efficiency of fishery wastewater is high.