微生物脱盐电池(MDC)对含铬废水的研究

Study on the treatment of Chromium wastewater by Microbial Desalination Cell

本文为了完成MDC反应器可以高效处理高浓度含铬废水,采取一个有效容积为900mL的三室微生物脱盐电池(MDC)进行研究,通过不断提高中间室盐浓度的方法,研讨MDC在运行阶段内阳极室的COD变化情况、电池的产电情况以及阴极室内Cr6+的去除效果,并探究怎样的参数调控能使得反应器可以快速稳定启动和得到反应器对于高浓度废水的处理效果。以厌氧和好氧活性污泥的混合物接种,当阳极室pH为6.35、温度为30℃时污泥的活性处于最佳状态。在改变中间室盐浓度的过程中,随着盐浓度的提高,各参数变化明显:在盐浓度为20g/L时,微生物脱盐电池的产电峰值可达1200mV,脱盐效率达62.31%,Cr^6+的去除率高达90.25%。在阳极室COD的检测中,当COD的去除率达83.57%时,再次提高盐浓度而去除率不再发生变化。综上所述,在中间室盐浓度为20g/L时各参数效果最佳。

In order to complete the MDC reactor, a high concentration of chromium containing wastewater can be treated efficiently, and a three-chamber microbial desalination Cell (MDC) with effective volume of the unit is studied, and the COD variation of the anode chamber during the operation phase of the MDC is discussed by increasing the salt concentration of the middle chamber. The power production of the battery and the removal effect of the cathode indoor Cr^6+, and explore how the parameter regulation can make the reactor can start quickly and stably and get the treatment effect of the reactor on the high concentration wastewater. When inoculated with a mixture of anaerobic and aerobic activated sludge, the activity of sludge was in the best condition when the pH of sludge was 6.35 and the temperature was 30℃. In the process of changing the concentration of salt in the middle Chamber, with the increase of salt concentration, the variation of each parameter is obvious: when the salt concentration is about 20 g/L, the peak of the production of microbial desalination battery can reach 1200 mV, and the removal rate of desalination efficiency up to 62.31%, removal rate of Cr6+ is up to 90.25 %. In the detection of COD in the anode chamber, when the removal rate of COD reaches 83.57 %, the salt concentration is increased again and the removal rate is no longer changed. To sum up, the effect of each parameter is the best when the salt concentration in the middle chamber is about 20 g/L.