Study On Treatment Of Swine Wastewater In The Integrated Membrane Bioreactor

Swine wastewater has considerable amounts of non-stabilized organic matter and high concentrations of ammonia, nitrogen and phosphorus. In order to assess the fesibility of integrated membrane bioreactor treating swine wastewater, we carry out a lab scale experiment which was designed by ourselves. We investigated on the effects of MBR with three different phases and compared the situation of sludge withdrawal with without sludge withdrawal. Based on condition which was controlled, we found out a best situation.The results of the experiments show that:1. After compared the result of three phases, we found the third phase can obtain the best result. Under condition that DO of 3mg/L ,HRT of 16h in the anoxic reactor, HRT of 26h in the MBR, MLSS of 15mg/L and SRT of 50d, the average removal rate of NH₃-N, COD, TN and TP is 97. 8%, 93. 7%, 90. 8%, 76%, respectively.2. MBR held an ability to resist organic shock loading. After high organic shock loading, the reactor can comeback to originally state which has a good removal rate.3. MBR can maintain high biomass concentration by separating biomass from the treated wastewater, but under the situation of without sludge withdrawal, the treating effects and stability of the system became poor. So, withdraw sludge is in the favor of improving the removal efficiencies of TP and reduce membrane fouling.4. Volumetric loading is one of the important parameters for MBR. Under the condition of the experiment, the NH₃—N volumetric loading is reached 0. 5kg/m3 . d.