化学预处理对微生物电解促进污泥厌氧发酵工艺影响研究
发布时间：2019-01-02 10:18
【摘要】：传统污泥厌氧发酵存在污泥水解速度慢和单位污泥产能低的问题。目前已经有研究证实微生物电解可以有效的提高厌氧发酵产甲烷速率和增强厌氧发酵的稳定性,但是污泥发酵的碳源转化率仍然很低,水解依旧是限速步骤。为了进一步提高污泥碳源转化率和产甲烷速率,本研究提出用化学预处理促进剩余污泥水解,进一步提高微生物电解-污泥厌氧发酵耦合工艺的甲烷产率和转化效率,通过化学试剂的选择建立促进胞外聚合物与胞内物质的溶出的有效方法,研究后续微生物电解促进污泥发酵产甲烷过程的碳源转化规律,对剩余污泥梯级转化效率影响进行分析评价。采用五种典型预处理试剂促进剩余污泥水解过程,构建剩余污泥短程产酸制备发酵液的预处理试剂,并对不同发酵液性质对微生物电解产氢效能影响进行了分析,比较了预处理试剂对挥发酸的积累及其对后续产氢的影响,中温发酵条件下3d获得挥发酸积累峰值,挥发酸积累量依次为环糊精鼠李糖脂过氧乙酸SDSNa OH空白,其中环糊精组获得了最大的挥发酸积累量达到了4713 mg COD/L,为空白的3.95倍。鼠李糖脂组总酸含量达到了3503mg COD/L,为空白的2.94倍。不同化学试剂促进产酸的机理不同,带来了挥发酸各组分比例差异,影响了后续微生物电解产能。通过剩余污泥水解产酸-微生物电解发酵液产氢分析表明,发酵组分中小分子挥发酸(乙酸和丙酸)比例越大越利于微生物电解产氢过程的能量回收效率。耦合体系梯级利用有机物获得最大氢气转化率达到8.5±0.5 mg H2/g VSS,不同碳源的转化效率顺序由高到低为:乙酸、丙酸、正丁酸、正戊酸、异戊酸和异丁酸,转化速率系数为乙酸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),异丁酸36.09 mg COD/d(R2=0.97),正戊酸53.44mg COD/d(R2=0.99),异戊酸47.86 mg COD/d(R2=0.96)。常温条件下,分析并提出了最优的预处理试剂,考察了预处理试剂对一体式微生物电解-污泥厌氧发酵工艺影响。考察预处理试剂对于污泥产甲烷的促进作用时发现,SDS的投加对产甲烷菌有很强抑制作用,环糊精组对于产甲烷有一定抑制作用,鼠李糖脂则对产甲烷菌基本不产生抑制作用,有利于应用到耦合工艺促进污泥产甲烷。选择鼠李糖脂作为提升微生物电解促进污泥厌氧发酵产甲烷耦合工艺的产甲烷性能的预处理试剂,获得较好效果。经鼠李糖脂预处理后,耦合系统的甲烷产量和产率都有所提高,总产量达到了78.4 mg CH4/g VSS,最大甲烷产率达到了156 m L/d,分别是为未经鼠李糖脂处理组的1.5和1.7倍。结果表明,合适的预处理手段可以有效的促进剩余污泥水解产酸-微生物电解发酵液产氢过程,而鼠李糖脂作为一种生物表面活性剂,显示出其环境友好性,其对于促进污泥发酵产酸和一体式耦合工艺产能方面均获得了良好的效果,应用鼠李糖脂在污泥预处理上,为进一步缩短污泥发酵时间,提高微生物电解促进剩余污泥发酵产甲烷速率有很大的应用价值。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703
本文编号：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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703
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