【摘要】：微生物電化學系統(tǒng)是一種新興的,可以從反應體系底物中回收能源的技術,在能源問題逐漸成為困擾人們的重大難題的21世紀,微生物電化學系統(tǒng)為解決能源問題提供了一個新的方向。微生物電化學系統(tǒng)主要包括微生物燃料電池和微生物電解池兩大類�，F(xiàn)行的城市污水處理工藝大多數(shù)為活性污泥法,該方法有著水處理效果好,基建及運行費用較低,對沖擊性水力負荷耐受程度較好等優(yōu)點。但是,該方法有一個很嚴重的問題,那就是在處理城市生活污水時,會產生較多的剩余污泥。于傳統(tǒng)剩余污泥的處理耗資巨大,直接棄之不管又會產生嚴重的環(huán)境污染。而微生物電化學系統(tǒng)可以回收剩余污泥中的能源,且運行條件較為溫和,因此對微生物電化學系統(tǒng)的污泥減量性能和能量回收性能進行研究就顯得十分有必要。本實驗首先考察了不同陰極催化劑形式的MFC在乙酸鈉底物和剩余污泥為底物下的運行效能。綜合乙酸鈉底物和剩余污泥底物下,MFC體系的產能情況,發(fā)現(xiàn)輥壓活性炭催化劑陰極體系的MFC反應器有著最好的電化學性能。同時在對剩余污泥進行處理時,其體系的COD、TSS、VSS去除效果與鉑炭催化劑陰極MFC體系相比,變化不大。在不同陰極催化劑形式下,三組不同陰極催化劑形式的反應器均實現(xiàn)了從底物中回收電能,雖然生物陰極反應器的產電效能較低,但其對底物變化的耐受性要更強一些。理論上講,鉑炭催化劑的效能應好于活性炭催化劑的效能,但是本實驗中活性炭采用輥壓工藝,附著于鋼網基質表面,而鉑炭催化劑采用涂布工藝,由于輥壓工藝陰極的均一性要更好,也由此使得本實驗中活性炭催化劑陰極性能要好于鉑炭催化劑陰極性能。為了探究輥壓活性炭催化劑和涂布鉑炭催化劑陰極在MEC反應器上的運行效能,后本實驗考察了,活性炭催化劑陰極和鉑炭催化劑陰極單室立方體MEC的產氣性能,對比發(fā)現(xiàn)在MEC體系下,活性炭催化劑陰極與鉑炭催化劑陰極的產氣性能差距不大。對比之下,本實驗采用輥壓性炭催化劑陰極作為滾筒式MEC的陰極催化系統(tǒng)。之后本實驗對比了滾筒式MEC在2 g/L單純底物乙酸鈉和復雜底物,堿預處理剩余污泥下的運行效能,并對滾筒式MEC的剩余污泥處理效能進行了初步探討。本實驗綜合考量了不同SRT下滾筒式MEC的產氣性能和污泥減量性能,確定了SRT為16天時,滾筒式MEC處理堿預處理剩余污泥,有著更為優(yōu)良的綜合性能。
[Abstract]:Microbial electrochemical system is a new technology which can recover energy from the substrate of the reaction system. In the 21st century, the energy problem has gradually become a major problem for people. Microbial electrochemical system provides a new direction for solving the energy problem. There are two main types of bio-electrolysis cell. Most of the current municipal sewage treatment processes are activated sludge process. This method has the advantages of good water treatment effect, low capital construction and operation cost, and good tolerance to impact hydraulic load. However, the microbial electrochemical system can recover energy from the excess sludge, and the operating conditions are relatively mild. Therefore, it is necessary to study the sludge reduction performance and energy recovery performance of the microbial electrochemical system. It is necessary. Firstly, the performance of MFC with different forms of cathode catalysts under the substrates of sodium acetate and excess sludge was investigated. The MFC reactor with rolled activated carbon cathode system has the best electrochemical performance. The removal efficiencies of COD, TSS and VSS in the system were similar to those of the platinum-carbon catalyst cathode MFC system when the excess sludge was treated. In theory, platinum-carbon catalyst should be more effective than activated carbon catalyst, but in this experiment, the activated carbon used roll-pressing process, adhered to the surface of steel mesh substrate, and platinum-carbon catalyst used coating process, because the uniformity of the cathode roll-pressing process is better, which makes the experiment live. The cathodic performance of carbon catalysts is better than that of platinum carbon catalysts. In order to investigate the performance of rolled activated carbon catalyst and platinum-coated carbon catalyst cathode in MEC reactor, the gas production performance of activated carbon catalyst cathode and platinum-coated carbon catalyst cathode in one-compartment cubic MEC was investigated. Compared with the platinum carbon catalyst cathode, the rolled carbon catalyst cathode was used as the cathode catalytic system of the drum-type MEC. Then the performance of the drum-type MEC under 2 g/L sodium acetate and complex substrate, alkali pretreatment of residual sludge, was compared. The treatment efficiency of excess sludge of drum-type MEC was preliminarily discussed. The gas production performance and sludge reduction performance of drum-type MEC under different SRTs were comprehensively considered. It was determined that the drum-type MEC could treat excess sludge by alkali pretreatment when SRT was 16 days.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

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本文編號：2208318