Typically The Proportion Of Solid Waste By Anaerobic Fermentation Optimization And Mechanism

With the acceleration of urbanization process, it is hard to avoid produced many difficult to dispose of solid waste, such as Waste activated sludge, manure and corn stalks, etc. Anaerobic fermentation in the efficient processing of these solid wastes,at the same time, it also can get a certain amount of resources, but the anaerobic fermentation of single raw material often appear more disadvantages,such as raw materials difficult to degradation, hydrolysis acidification, C / N deficiency, nutrient imbalance. so fermentation of raw materials is particularly necessary. This topic through the fermentation raw material of residual activated sludge, ultrasonic treatment, pairwise fermentation of corn straw after alkali treatment. On the basis of using response surface method was used to study the substrate concentration and the ratio of raw materials on three material mixed fermentation of biogas production effect, and studies the optimization ratio in the initial stage of the reaction, gas production peak and late reaction from the microbial community structure and organic matter transport and transformation.Through the pretreatment of sludge, SCOD content by 816.5mg/L rose to 13890mg/L and protein concentration increased to 461mg/L, straw composition affect the fermentation process of hydrolysis step of wood element from 10.38% reduce to the 6.42%, the degradation rate reached 38.15%. Hemicellulose from 32.54% reduced to 16.62%, degradation rate of 48.9%, resin fractionation experiments show that sludge after ultrasonic treatment Suva values and hydrophobic / hydrophilic has been reduced, not by the pretreatment of cow dung Suva is only half of the ultrasonic pretreatment, the hydrophobic / hydrophilic is almost the same. Pretreatment test showed that the pretreated sludge and straw can be biochemical is improved without the treatment of cow dung is the dissolution of a number of aromatic substances.Study on sludge, corn straw and cow dung two two fermentation results showed that the cow dung and straw VS ratio was 1:1, the gas production rate was 613.8 m L/g VS, the methane content was 62.32%; sludge and straw VS ratio was 1:2, the gas production rate was 472.33 m L/g VS, the methane content was 60.52%; the ratio of sludge and cow dung VS 1:2, the gas production rate was 470.33 m L/g VS, the methane content is 58.68%; the mixed fermentation process without acid and ammonia inhibition, COD and substrate removal rate is far greater than the single raw material fermentation, the gas production is the best ratio of daily gas production and cumulative gas production dynamics analysis, the correlation coefficient of gas production in 0.6, the correlation coefficient of the cumulative gas production was above 0.98, which indicates that the model is better fitting degree.Using response surface methodology on the substrate concentration and the ratio of raw materials of sludge and straw and cow dung mixed fermentation gas production effects. The results of experiment show that, when the substrate concentration is 15g/VS, straw, cow manure, sludge =1:1:0.8, production volume 8066 m L. Reaction in the process of EBOM in Suva value decreased from 0.33 of the initial reaction to 0.06, hydrolysis, fractionated sample spectra analysis showed that with reaction, EBOM components has been different degradation and gas production reached its peak when hpo-n be digested with restriction factors and reaction subsequent microbial mainly use TPI to life activities.Optimization of the ratio of bacteria in the ratio of 74394 OTU sequences, Shannon index gradually increased. Increased from 5.366738 to 6.315557. The results of sequencing showed that the microbial population abundance increased with the reaction time. Samples in the flora of the content is as follows: Protecbacteria> Bacteroidetes) > Firmicutes> Chloroflexi and class classification deltaproteobacteria outline of flora content from 3.75% rise to 4.61%, this may because of the reaction in the process of decomposition of protein and polysaccharide macromolecular substance induced. The proportion of Bacteroidetes increased to 15.4%, which indicated that the protein and polysaccharide in the substrate material were degraded by. The ancient bacteria had 74394 OTU sequences, the Shannon index increased from 3.33894(early stage) to 3.711827(peak gas production), and then decreased to 3.139862(late stage). The results of sequencing showed that the microbial population abundance increased at the peak of gas production. The late response of the reaction was less than the initial stage of reaction.