hydrolysis acidification
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2022 ◽  
Vol 304 ◽  
pp. 114305
Author(s):  
Yanqiong Wang ◽  
Hongwu Wang ◽  
Hui Jin ◽  
Xiaoqin Zhou ◽  
Hongbin Chen

2021 ◽  
Author(s):  
Anahita Rabii

<div>Municipalities are facing increasing challenges regarding management and disposal of solid waste. Anaerobic digestion (AD) of municipal biowaste enables waste reduction and biogas production that can be utilized as a renewable source of energy for heat and power generation. Anaerobic co-digestion (AnCoD) enhances the performance of conventional mono-digestion. The mixing ratio of the feedstocks is an important criterion in AnCoD design which is typically determined based on the optimum carbon to nitrogen (C:N) ratio within the range of 25-30 or COD:N ratio in the range of 50-140. However, literature has shown contradictory results for the optimum C:N and COD:N ratios.</div><div>Therefore, the main objective of this study was to primarily investigate the influence of the mixing ratio of the feedstocks including thickened waste activated sludge (TWAS), manure and source separated organics (SSO) on improving biomethane production and introducing a new methodology for optimizing the mixing ratio in AnCoD based on the lipids, proteins, and carbohydrates contents as the three main compounds existing in biowaste. The hydrolysis/acidification performance in AnCoD of manure, TWAS and SSO individually and in different combinations was also investigated. This study has introduced an empirical model to explain the relationship between the biomethane production and lipids: proteins: carbohydrates ratio of the feedstocks in anaerobic co-digestion of TWAS, manure and SSO. Among the binary ad ternary combinations, the ternary co-digestion of TWAS/manure/ SSO at the mixing ratio of 2:4:4 and lipids: proteins: carbohydrates ratio of 1:3:12 resulted in the maximum ultimate methane production. The maximum methane yield of 363 ml CH4/g COD added corresponded to co-digestion of manure/SSO at the mixing ratio of 7:3. The maximum hydrolysis rate corresponded to the co-digestion of TWAS/manure at the ratio of 9:1. Overall, the best performance in both hydrolysis and methanogenesis was achieved by the co-digestion of TWAS with SSO at the ratio of 3:7 as well as TWAS/manure/SSO at the ratio of 2:4:4 compared to other feedstock mixes. It was observed that the proposed second order polynomial model could describe the relationship between biomethane production and lipids, proteins, and carbohydrates content of the feedstock.</div>


2021 ◽  
Author(s):  
Anahita Rabii

<div>Municipalities are facing increasing challenges regarding management and disposal of solid waste. Anaerobic digestion (AD) of municipal biowaste enables waste reduction and biogas production that can be utilized as a renewable source of energy for heat and power generation. Anaerobic co-digestion (AnCoD) enhances the performance of conventional mono-digestion. The mixing ratio of the feedstocks is an important criterion in AnCoD design which is typically determined based on the optimum carbon to nitrogen (C:N) ratio within the range of 25-30 or COD:N ratio in the range of 50-140. However, literature has shown contradictory results for the optimum C:N and COD:N ratios.</div><div>Therefore, the main objective of this study was to primarily investigate the influence of the mixing ratio of the feedstocks including thickened waste activated sludge (TWAS), manure and source separated organics (SSO) on improving biomethane production and introducing a new methodology for optimizing the mixing ratio in AnCoD based on the lipids, proteins, and carbohydrates contents as the three main compounds existing in biowaste. The hydrolysis/acidification performance in AnCoD of manure, TWAS and SSO individually and in different combinations was also investigated. This study has introduced an empirical model to explain the relationship between the biomethane production and lipids: proteins: carbohydrates ratio of the feedstocks in anaerobic co-digestion of TWAS, manure and SSO. Among the binary ad ternary combinations, the ternary co-digestion of TWAS/manure/ SSO at the mixing ratio of 2:4:4 and lipids: proteins: carbohydrates ratio of 1:3:12 resulted in the maximum ultimate methane production. The maximum methane yield of 363 ml CH4/g COD added corresponded to co-digestion of manure/SSO at the mixing ratio of 7:3. The maximum hydrolysis rate corresponded to the co-digestion of TWAS/manure at the ratio of 9:1. Overall, the best performance in both hydrolysis and methanogenesis was achieved by the co-digestion of TWAS with SSO at the ratio of 3:7 as well as TWAS/manure/SSO at the ratio of 2:4:4 compared to other feedstock mixes. It was observed that the proposed second order polynomial model could describe the relationship between biomethane production and lipids, proteins, and carbohydrates content of the feedstock.</div>


2021 ◽  
pp. 126047
Author(s):  
Xiangmiao Tian ◽  
Xiaoguang Jin ◽  
Jie Wang ◽  
Zhiqiang Shen ◽  
Yuexi Zhou ◽  
...  

2021 ◽  
Vol 84 (6) ◽  
pp. 1477-1486
Author(s):  
Mengshi Zhao ◽  
Qiang Fu ◽  
Yu Yang ◽  
Li Zhang ◽  
Si Shan

Abstract The hydrolysis acidification tank mainly relies on microorganisms to treat oily sewage, but in many cases the chemical oxygen demand (COD) of the effluent from the hydrolysis acidification tank does not decrease or even increase. In this work, about 50 L of oily wastewater is treated in a facultative anaerobic hydrolysis acidification tank with a temperature of 29 °C, pH 6, high-throughput sequencing technology analyzes found that after long-term operation of the hydrolysis and acidification tank, the dominant bacterial Pseudomonas accounted for only 2.87%, at this time, the effluent COD of the hydrolysis and acidification tank was 450 mg/L. Pseudomonas stutzeri LH-42 a strain screened in the laboratory, was domesticated and colonized in the hydrolysis acidification tank. High-throughput sequencing and bioinformatics analysis showed that the proportion of Pseudomonas in the hydrolysis acidification tank reached 5.89%, the effluent COD of the hydrolysis and acidification tank was 200 mg/L. The above results indicate the importance of the proportion of Pseudomonas in the hydrolysis and acidification tank for the COD degradation of oily wastewater.


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