The Application Study On Anaerobic Baffled Reactor Combined With Non-woven Treating Dairy Wastewater

Anaerobic Baffled Reactor (ABR) is the third-generation new anaerobic apparatus developed according to the theory of Staged Multi-Phase Anaerobic Reactor (SMPA). ABR became the research hotspot for environmental scientists the minute it aroused.Membrane bioreactor is a kind of new sewage disposing technology, combining the membrane separation technology and biological treatment technology. The technology has advantagys such as simple technology, little space, high quality of water output, high automatic level, less excess sludge. The technology has passed through several dozens years development, and has been widely explicated. The high price of membrane filtration module is the main factor of restricting extensive application of membrane bioreactor. Membrane bioreactor is into the high-powered and high-priced ball game.In this experiment, ABR is carried out to treat the dairy wastewater, then the process is improved. Using low-cost nonwovens instead of hollow-fibre membranes which are used widely within the recent years as filter unit is added to the following process of wastewater. In my experiment, the price of nonwovens is a thirtieth of ollow-fibre membranes.The getting up and running of ABR are studied, I have also measured the removal efficiency, biomass live weight, gas production rate in different load. The experiment have show that in the fixed HRT, high influent concentration can start up anaerobic reactor. In this study, the biochemical quality of high concentration dairy wastewater achieved satisfactory effect.Based on the operation control system, successful development of Anaerobic Baffled Reactor achieved satisfactory effects in treating high concentration dairy wastewater:(1)In the situation of seeding aerobic activated sludge(28.7 gMLSS/L,16.2gVSS/L) and 48 HRT, when the influent CODCr change 2000 mg/L to 10000 mg/L, the CODCr removal rate is no smaller than 94%,the mature granular sludges are turned up in every incubator.(2)When the organic loading change from 2000mg/L-10000mg/Land the influent CODCr achieve 10000mg/L, the CODCr removal rates of 1-4 cells:62.5%,72.3%,88.8%,92.4%, pH is 5.4,6.9,7.1,7.2, MLSS is 38mg/L,37.5mg/L,36.4mg/L,30.2mg/L,MLVSS/MLSS is 0.80,0.78,0.75,0.65, gas production rate is 55L/d,21L/d,7.5L/d,1.6 L/d.This paper has researched the removal efficiency of Non-woven fabric with apertureΦ10μm to CODcr and BOD5, which is in the situation of artesian water and pumping water, According to theoretical analysis and experimental study, the conclusions of this study are shown as follows:(1)water flux experiment shows a close correlation between flux and pressure in 10μm non-woven fabrics, the flux will increase with the pressure increase, in the MLSS concentration of 600mg/L, the critical value of 32cm water column;(2)After mature filter cake layer formed, the removal rate of CODCr and BOD5 can reach 75% and 70% respectively, and have steady outflow water quality in the situation of artesian water, but when the start-stop proportion of pumping water is 1:1, the CODCr can stay below 200mg/L,the volatility in former is larger, however, the volatility in latter can also keep 80% and 78%.This paper reveal the law of 4 Cells of ABR to remove organic, research its engineering applications, provide theory and technical guidance for practical engineering; and study the mechanism of non-woven fabrics fouling. The result shows that, for the characteristics of non-woven fabric structural, pollution is mainly due to internal contamination caused by nonwovens, non-woven fiber on microbial adhesion is the main reason for flux decline.