Study On Integrated Two-phase Anaerobic Baffled Process For Wastewater Treatment

With the shortage of the fresh water and the increase of wastewaterquantity, the wastewater treatment industry is facing the austere situation. InChina, the standard to judge the advanced wastewater treatment processes issuitable for the condition of China because of serious pollution and shortageof resource, at the same time, it should be highly efficiency ,low consumptionand cost. The new treatment technology with high efficiency, lowconsumption will take on an important role in municipal wastewater in China.The requirement can be met by the integral tow-phase anaerobic baffledreactor. The key factor for wastewater treatment enhancement is utilization ofactivity of microorganism and increase of mass transfer efficiency in theprocess.The activity of microorganism and kinetics of mass transfer and reactionprocess in integral tow-phase anaerobic baffled reactor were investigated.The basis theory on the process was concluded that treatment efficiency canbe enhanced by strengthening the activity of microorganism i.e. throughtandem compartment formed by adopting baffle along water flow direction,acidogenic phase and mathanogenic phase separation and substrate andmicroorganism fully contact under the role of stream, gas production andfiller caused organic degradation. In addition, through alkalinity input and pHvalue control, buffer capacity and treatment efficiency in the reactor can beenhanced.The integral tow-phase anaerobic baffled reactor is characterized withmass transfer improvement in the reactor , and increasing alkalinity for thebuffer capability enhancement by adding Na2CO3 to reaction and controllingoptimal pH value which is suitable for acidic and methane bacterium. Inresult, the organic matters can be removed efficiently in the reactor.The paper demonstrated that the integral tow-phase anaerobic baffledreactor is highly efficiency through experiment for more than one year. Theconclusions are showed as followed:1. This paper demonstrated that Biofilm is adaptable to environment inthe reactor and is resistance to loading variation by the startup mean ofadding anaerobic bacteria after aerobic accumulation.2. Considering the relation between the activity of microorganism andtemperature and taking energy into account, the reaction is runed in lowtemperature;3. Considering PH vs specific TTC–dehydrogenase activity, Na2CO3was added into the system to increase alkalinity so as to improve thecapability of abirritation of the system at the anaerobic stage and create anoptimal pH condition. The results demonstrated that the better specific TTC–dehydrogenase activity of acidic bacterium when pH was 4.8~6.27 at theacerbic stage and 4.8~6.27 at the anaerobic stage, the more organic matterswill be removed;4. The results demonstrated that the integral tow-phase anaerobic baffledreactor can get higher removal rate of organic matters in the shorter time. Theremoval rate of COD come up to 90% when the optimal HRT is 8h;5. The integral tow-phase anaerobic baffled reactor is more efficient wheninfluent COD is 500mg/L and reflux ratio is 150%. The removal rate of CODis 98%. The result demonstrated that suitable reflux ratio do good to removalrate.A conclusion can be drawn that the high efficiency in a system can beachieved by Creating environment suitable for microorganism, putting fillerin the reactor and adjusting to proper return flow ratio. This new wastewatertreatment process will resolve the current the problem such as the shortage ofconstruction fund and running cost and so on. Therefore, it is a meaningfulwork not only with the benefits in theory, but also with the benefits ofenvironment, economy and society.