Study On Sewage Treatment And Reuse Equipment Used In Ecotypic Domicile

With the rapid development of economy and the improvement of people's living standard, Choosing ecotypic domicile has become common sense, so the concept of ecotypic domicile is appeared.The task of this research subject is to develop a sewage treatment equipment used in ecotypic domicile. The treatment capacity of the equipment should be according with the outlet of five people's family. The effluent quality should reach the reuse standard. The treatment equipment should be compact, the volume of the equipment should be reduced, the process should be advanced and easily operating and self-controlling to some extent. In order to achieve above goal, a small abbreviated membrane bio-reactor was schemed out to find out compatible operating parameter, then the treatment equipment was designed.Hybrid membrane bioreactor was choosed as treatment equipment using in ecotypic domicile after analyzing experiment result of disposing car-washing wastewater and municipal wastewater using ceramics membrane bioreactor and analyzing advantages and disadvantages traditional membrane bioreactor. It indicated that this bioreactor has strong ability of shock loading resistance and can conquer sludge expansion. Because of the existence of padding the reactor can maintain low suspending sludge concentration and can reduce membrane contamination. The membrane separation and bioreactor can both operate in high efficiency.In the condition of no sludge discharge, the reactor was operated about one month separately in terms of HRT=4h, 6h, 8h, 10h. The result indicated that the removal rate of the system to COD were all above 90%. The COD removal rate of bio-treatment cell increased according to the increase of HRT, but the longer HRT leaded to lower organic loading. When the organic loading was at a low level, the microorganisms' endogenous respiration would happen for lack of nutrition, so the amount of the microorganisms would reduce.In the condition of HRT=8h, the reactor operated about one month separately in terms of SRT=5d, 10d, 20d, 40d. The result showed that the SRT has a little effect on the removal rate of COD. Because of the existence of padding the attached growth sludge concentration accounted for most of total sludge concentration, so the suspending sludge discharge has a little effect on total sludge concentration. SRT affects the removal rate of NH3-N greatly. The removal rate of NH3-N increased according to the increase of SRT. According to analyzing the SOUR activity of microorganismshowed that the SOUR activity of suspending microorganism reduced according to the increase of SRT and the SRT has little effect on the SOUR activity of attached growth microorganism. According the above analysis the sewage treatment equipment will operate in the condition of no sludge discharge.In the condition of HRT=8h and no sludge discharge, the effect of DO on the removal rate of contamination has been analyzed. The results show that increasing DO can increase the removal rate of contamination, but thus the energy consumption was increased.The variety of the transmembrane pressure during the long-term running test was analyzed. The results showed that the transmembrane pressure and resistance were related to flux and accumulated degree of soluble organic in the MBR. Then effects of pump period and aeration intensity, on the increasing rate of the transmembrane pressure were investigated. The membrane fouling was visualized by scanning electron microscope and the membrane cleaning ways were investigated. It was found that the membrane fouling was concentrated on the surface mainly, and the internal fouling was not obvious. After soaking by the lye, the cake layer on the membrane surface was removed basically.The wastewater treatment equipment used in ecotypic domicile was designed according to optimal operation parameters and the economic analysis of municipal wastewater treatment by this equipment.