The Application Of High Flux And Non-Backwashing Of Micro-Mesh Dynamic Membrane Component In Water Treatment

At the present stage in China, we are facing a serious shortage of water resources. To some extent, it restricts the normal development of the national economy, and gradually affects people’s daily life. So, effective treatment to production and living sewage which has been discharged into water body to wastewater reuse is an important way to solve this problem. This paper is to "dynamic membrane net migration patterns" as the foundation and the purpose is to research a new type and high efficient of dynamic membrane component for wastewater reuse. The experiment developed a coarse pore-sized membrane component of non-backwashing and made an experiment device about dynamic membrane bioreactor by self. The content of experimental research cover component structure optimization, choosing of coarse pore-sized filtration material, the development of control method of backwashing, continuous running under high flux by the homemade device. The experiment tested effluent quality (including BOD, COD, NH4+, TN, TP, turbidity) from the reactor which is used to discharge municipal wastewater and observed the change of membrane on the coarse pore-sized filtration material by microscopic. In addition, it also made a technical an economic evaluation when the system handled municipal wastewater about60m3/d for urban miscellaneous water and landscape water reuse. The experimental conclusion.(1) To solve some problems, such as large water consumption by backwashing, high energy consumption, dynamic membrane is hard to form by using large aperture of filtration material, the upstream face from the external cavity of component is not easy cleaned, time of backwashing cycle is difficult to determine.(2) It showed that when using stopping aeration, the inverse brushing time was2h and the transmission speed was20rad/min, the system’s returning time(water turbidity is less than1NTU as a standard)of normal water production was less than21h. And the system could operate more than90d and the water production rate reached90%if the flux was45L/(m2.h)and backwashing cycle was30d.In addition, the results of test to effluent quality showed that the average removal efficiencies of COD, NH4+, TN, TP were85.10%,81.11%,50.92%,50.00%and turbidity were less than1NTU.(3) The cost of tons of water and operation costs were1355yuan/m3and1.16yuan/m3when the system handled municipal wastewater about60m3/d for urban miscellaneous water and landscape water reuse.