化學預處理對微生物電解促進污泥厭氧發(fā)酵工藝影響研究
發(fā)布時間：2019-01-02 10:18
【摘要】：傳統(tǒng)污泥厭氧發(fā)酵存在污泥水解速度慢和單位污泥產(chǎn)能低的問題。目前已經(jīng)有研究證實微生物電解可以有效的提高厭氧發(fā)酵產(chǎn)甲烷速率和增強厭氧發(fā)酵的穩(wěn)定性,但是污泥發(fā)酵的碳源轉化率仍然很低,水解依舊是限速步驟。為了進一步提高污泥碳源轉化率和產(chǎn)甲烷速率,本研究提出用化學預處理促進剩余污泥水解,進一步提高微生物電解-污泥厭氧發(fā)酵耦合工藝的甲烷產(chǎn)率和轉化效率,通過化學試劑的選擇建立促進胞外聚合物與胞內(nèi)物質的溶出的有效方法,研究后續(xù)微生物電解促進污泥發(fā)酵產(chǎn)甲烷過程的碳源轉化規(guī)律,對剩余污泥梯級轉化效率影響進行分析評價。采用五種典型預處理試劑促進剩余污泥水解過程,構建剩余污泥短程產(chǎn)酸制備發(fā)酵液的預處理試劑,并對不同發(fā)酵液性質對微生物電解產(chǎn)氫效能影響進行了分析,比較了預處理試劑對揮發(fā)酸的積累及其對后續(xù)產(chǎn)氫的影響,中溫發(fā)酵條件下3d獲得揮發(fā)酸積累峰值,揮發(fā)酸積累量依次為環(huán)糊精鼠李糖脂過氧乙酸SDSNa OH空白,其中環(huán)糊精組獲得了最大的揮發(fā)酸積累量達到了4713 mg COD/L,為空白的3.95倍。鼠李糖脂組總酸含量達到了3503mg COD/L,為空白的2.94倍。不同化學試劑促進產(chǎn)酸的機理不同,帶來了揮發(fā)酸各組分比例差異,影響了后續(xù)微生物電解產(chǎn)能。通過剩余污泥水解產(chǎn)酸-微生物電解發(fā)酵液產(chǎn)氫分析表明,發(fā)酵組分中小分子揮發(fā)酸(乙酸和丙酸)比例越大越利于微生物電解產(chǎn)氫過程的能量回收效率。耦合體系梯級利用有機物獲得最大氫氣轉化率達到8.5±0.5 mg H2/g VSS,不同碳源的轉化效率順序由高到低為:乙酸、丙酸、正丁酸、正戊酸、異戊酸和異丁酸,轉化速率系數(shù)為乙酸341.32 mg COD/d(R2=0.97),丙酸147.99 mg COD/d(R2=0.99),正丁酸68.94mg COD/d(R2=0.91),異丁酸36.09 mg COD/d(R2=0.97),正戊酸53.44mg COD/d(R2=0.99),異戊酸47.86 mg COD/d(R2=0.96)。常溫條件下,分析并提出了最優(yōu)的預處理試劑,考察了預處理試劑對一體式微生物電解-污泥厭氧發(fā)酵工藝影響�？疾祛A處理試劑對于污泥產(chǎn)甲烷的促進作用時發(fā)現(xiàn),SDS的投加對產(chǎn)甲烷菌有很強抑制作用,環(huán)糊精組對于產(chǎn)甲烷有一定抑制作用,鼠李糖脂則對產(chǎn)甲烷菌基本不產(chǎn)生抑制作用,有利于應用到耦合工藝促進污泥產(chǎn)甲烷。選擇鼠李糖脂作為提升微生物電解促進污泥厭氧發(fā)酵產(chǎn)甲烷耦合工藝的產(chǎn)甲烷性能的預處理試劑,獲得較好效果。經(jīng)鼠李糖脂預處理后,耦合系統(tǒng)的甲烷產(chǎn)量和產(chǎn)率都有所提高,總產(chǎn)量達到了78.4 mg CH4/g VSS,最大甲烷產(chǎn)率達到了156 m L/d,分別是為未經(jīng)鼠李糖脂處理組的1.5和1.7倍。結果表明,合適的預處理手段可以有效的促進剩余污泥水解產(chǎn)酸-微生物電解發(fā)酵液產(chǎn)氫過程,而鼠李糖脂作為一種生物表面活性劑,顯示出其環(huán)境友好性,其對于促進污泥發(fā)酵產(chǎn)酸和一體式耦合工藝產(chǎn)能方面均獲得了良好的效果,應用鼠李糖脂在污泥預處理上,為進一步縮短污泥發(fā)酵時間,提高微生物電解促進剩余污泥發(fā)酵產(chǎn)甲烷速率有很大的應用價值。
[Abstract]:The traditional sludge anaerobic fermentation has the problems of low sludge hydrolysis speed and low unit sludge capacity. At present, it has been found that the microbial electrolysis can effectively improve the methane production rate of the anaerobic fermentation and the stability of the anaerobic fermentation, but the carbon source conversion rate of the sludge fermentation is still low, and the hydrolysis is still the speed limiting step. in ord to further improve that conversion rate of the sludge carbon source and the methane production rate, the present study proposes to promote the hydrolysis of the residual sludge by chemical pretreatment, further improve the methane yield and conversion efficiency of the microbial electrolysis-sludge anaerobic fermentation coupling process, The effective method of promoting the dissolution of the extracellular polymer and the intracellular material was established by the choice of chemical reagent. The transformation of carbon source in the methane production process of the sludge by the subsequent microbial electrolysis was studied, and the effect of the conversion efficiency of the residual sludge was analyzed and evaluated. in that invention, five typical pretreatment reagent are adopted to promote the hydrolysis process of the residual sludge, a pretreatment reagent for preparing the residual sludge short-range production acid to prepare the fermentation liquor is constructed, and the effect of different fermentation liquid properties on the hydrogen production efficiency of the microbial electrolysis is analyzed, the accumulation of the volatile acid and the effect on the subsequent hydrogen production of the pretreatment reagent are compared, the accumulated peak value of the volatile acid is obtained under the condition of the medium temperature fermentation, and the volatile acid accumulation amount is in turn a cyclodextrin rhamnose lipid peracetic acid SDSNa OH blank, The maximum amount of volatile acid in the group was 4713 mg COD/ L, which was 3.95 times that of the blank. The total acid content of the rhamnolipid group reached 3503mg COD/ L, which was 2.94 times of that of the blank. The mechanism of the different chemical reagents to promote the production of acid is different, and the proportion difference of the components of the volatile acid is brought, and the subsequent microbial electrolysis capacity is affected. The hydrogen production analysis of the acid-microbial electrolysis fermentation liquor by the residual sludge hydrolysis shows that the higher the proportion of the small and medium-sized molecular volatile acid (acetic acid and propionic acid) in the fermentation component is beneficial to the energy recovery efficiency of the hydrogen production process of the microbial electrolysis. The conversion efficiency of different carbon sources is high to low: acetic acid, propionic acid, n-butyric acid, n-valeric acid, isovaleric acid and isobutyric acid, the conversion rate coefficient is 343.32 mg COD/ d (R2 = 0.97), propionic acid 147.99 mg COD/ d (R2 = 0.99), n-butyric acid was 68. 94mg COD/ d (R2 = 0.91), isobutyric acid 36.09 mg COD/ d (R2 = 0.97), n-valeric acid 53. 44mg COD/ d (R2 = 0.99), isovaleric acid 47. 86 mg COD/ d (R2 = 0.96). Under the condition of normal temperature, the optimal pretreatment reagent was put forward, and the effect of the pretreatment reagent on the anaerobic fermentation process of the one-piece microbial electrolysis-sludge was investigated. The effect of the pretreatment reagent on the methane production of the sludge was investigated, and it was found that the addition of the SDS had a strong inhibition effect on the methanogenic bacteria, and the cyclodextrin group had a certain inhibition effect on the methane production, and the rhamnolipid had no inhibition effect on the methanogenic bacteria. and is beneficial to the application to the coupling process for promoting the methane production of the sludge. and the rhamnolipid is selected as a pretreatment reagent for promoting the methane production performance of the methane-producing coupling process of the sludge anaerobic fermentation by using the rhamnolipid as a promotion microbial electrolysis, and a better effect is obtained. After the pretreatment of rhamnose, the yield and yield of methane in the coupling system increased, the total yield reached 74.8 mg of CH4/ g VSS, and the maximum methane yield reached 156 m L/ d, respectively, which was 1.5 and 1.7 times that of the non-rhamnolipid treatment group, respectively. The results show that the suitable pretreatment method can effectively promote the production of the acid-microbial electrolysis fermentation liquor produced by the residual sludge, and the rhamnolipid is used as a biological surface active agent to show the environment-friendly property. The method has good effect on promoting the production capacity of the sludge fermentation production acid and the integral coupling process, and the rhamnose grease is applied to the sludge pretreatment, so that the sludge fermentation time is further shortened, the microbial electrolysis is improved, and the methane production rate of the residual sludge is greatly applied.
【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
本文編號：2398373
[Abstract]:The traditional sludge anaerobic fermentation has the problems of low sludge hydrolysis speed and low unit sludge capacity. At present, it has been found that the microbial electrolysis can effectively improve the methane production rate of the anaerobic fermentation and the stability of the anaerobic fermentation, but the carbon source conversion rate of the sludge fermentation is still low, and the hydrolysis is still the speed limiting step. in ord to further improve that conversion rate of the sludge carbon source and the methane production rate, the present study proposes to promote the hydrolysis of the residual sludge by chemical pretreatment, further improve the methane yield and conversion efficiency of the microbial electrolysis-sludge anaerobic fermentation coupling process, The effective method of promoting the dissolution of the extracellular polymer and the intracellular material was established by the choice of chemical reagent. The transformation of carbon source in the methane production process of the sludge by the subsequent microbial electrolysis was studied, and the effect of the conversion efficiency of the residual sludge was analyzed and evaluated. in that invention, five typical pretreatment reagent are adopted to promote the hydrolysis process of the residual sludge, a pretreatment reagent for preparing the residual sludge short-range production acid to prepare the fermentation liquor is constructed, and the effect of different fermentation liquid properties on the hydrogen production efficiency of the microbial electrolysis is analyzed, the accumulation of the volatile acid and the effect on the subsequent hydrogen production of the pretreatment reagent are compared, the accumulated peak value of the volatile acid is obtained under the condition of the medium temperature fermentation, and the volatile acid accumulation amount is in turn a cyclodextrin rhamnose lipid peracetic acid SDSNa OH blank, The maximum amount of volatile acid in the group was 4713 mg COD/ L, which was 3.95 times that of the blank. The total acid content of the rhamnolipid group reached 3503mg COD/ L, which was 2.94 times of that of the blank. The mechanism of the different chemical reagents to promote the production of acid is different, and the proportion difference of the components of the volatile acid is brought, and the subsequent microbial electrolysis capacity is affected. The hydrogen production analysis of the acid-microbial electrolysis fermentation liquor by the residual sludge hydrolysis shows that the higher the proportion of the small and medium-sized molecular volatile acid (acetic acid and propionic acid) in the fermentation component is beneficial to the energy recovery efficiency of the hydrogen production process of the microbial electrolysis. The conversion efficiency of different carbon sources is high to low: acetic acid, propionic acid, n-butyric acid, n-valeric acid, isovaleric acid and isobutyric acid, the conversion rate coefficient is 343.32 mg COD/ d (R2 = 0.97), propionic acid 147.99 mg COD/ d (R2 = 0.99), n-butyric acid was 68. 94mg COD/ d (R2 = 0.91), isobutyric acid 36.09 mg COD/ d (R2 = 0.97), n-valeric acid 53. 44mg COD/ d (R2 = 0.99), isovaleric acid 47. 86 mg COD/ d (R2 = 0.96). Under the condition of normal temperature, the optimal pretreatment reagent was put forward, and the effect of the pretreatment reagent on the anaerobic fermentation process of the one-piece microbial electrolysis-sludge was investigated. The effect of the pretreatment reagent on the methane production of the sludge was investigated, and it was found that the addition of the SDS had a strong inhibition effect on the methanogenic bacteria, and the cyclodextrin group had a certain inhibition effect on the methane production, and the rhamnolipid had no inhibition effect on the methanogenic bacteria. and is beneficial to the application to the coupling process for promoting the methane production of the sludge. and the rhamnolipid is selected as a pretreatment reagent for promoting the methane production performance of the methane-producing coupling process of the sludge anaerobic fermentation by using the rhamnolipid as a promotion microbial electrolysis, and a better effect is obtained. After the pretreatment of rhamnose, the yield and yield of methane in the coupling system increased, the total yield reached 74.8 mg of CH4/ g VSS, and the maximum methane yield reached 156 m L/ d, respectively, which was 1.5 and 1.7 times that of the non-rhamnolipid treatment group, respectively. The results show that the suitable pretreatment method can effectively promote the production of the acid-microbial electrolysis fermentation liquor produced by the residual sludge, and the rhamnolipid is used as a biological surface active agent to show the environment-friendly property. The method has good effect on promoting the production capacity of the sludge fermentation production acid and the integral coupling process, and the rhamnose grease is applied to the sludge pretreatment, so that the sludge fermentation time is further shortened, the microbial electrolysis is improved, and the methane production rate of the residual sludge is greatly applied.
【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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