Johkasou Reactor for the Treatment of Domestic Sewage and the Influence of Different Aeration on the Treatment Effect of Sewage

[Objective]The research aimed to provide the technical support for developing sewage treatment technology for rural areas.[Method]A johkasou was developed for the treatment of domestic sewage with two-step anaerobic bio-filters and contacting oxidation treatment technology.The influences of different aeration on the treatment effect were investigated and the optimum aeration quantity was confirmed.[Result]When the aeration quantity was 0.1-0.3 m3/h,dissolved oxygen concentration increased with the increasing of aeration quantity.The highest removal efficiency of COD was 94% at the highest aeration quantity,and the change amplitude decreased gradually with the rise of aeration quantity.Under the conditions of sufficient oxygen supply,the effluent NH3-N was less than 10 mg/L.The removal efficiency of NH3-N reduced obviously at lower aeration quantity.[Conclusion]The efficient treatment of domestic sewage can be realized by using this johkasou reactor.When the aeration quantity was 0.1-0.3 m3/h,the treatment efficiency of sewage was enhanced with the rise of aeration quantity.