全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

The use of hydrodynamic disintegration as a means to improve anaerobic digestion of activated sludge

Study on release of pollutants from sludge via anaerobic hydrolysis-acidification and its influencing factors
污泥水解酸化过程中污染物的释出及其影响因素研究

Performance and Mechanism of Excess Sludge Reduction in an OSA (Oxic-Settling- Anaerobic) Process
好氧-沉淀-厌氧工艺剩余污泥减量性能和机理研究

Effect of characteristics of waste activated sludge and experimental conditions on ultrasonic disintegration
超声破解污泥影响因素分析

Hydrolysis and biological release mechanisms of phosphorus from phosphorus-rich waste activated sludge during anaerobic digestion
富磷剩余污泥厌氧消化过程中的水解与生物释磷机制

Effect of Combined Microwave-Ultrasonic Pretreatment on Anaerobic Biodegradability of Primary, Excess Activated and Mixed Sludge

REDUCING OF EXCESS SLUDGE PRODUCTION IN WASTEWATER TREATMENT USING COMBINED ANAEROBIC/AEROBIC SUBMERGED BIOLOGICAL FILTERS

Remove and recover phosphorus during anaerobic digestion of excess sludge by adding waste iron scrap

Factors of Effecting Hydrogen Production from Anaerobic Fermentation of Excess Sewage Sludge
污泥厌氧发酵产氢的影响因素

Characterisation of Excess Sludge Reduction in an Anoxic + Oxic-Settling-Anaerobic Activated Sludge Process
A+OSA活性污泥工艺剩余污泥减量特性研究

更多...

Effect of Thermal Disintegration of Excess Sludge on the Effectiveness of Hydrolysis Process in Anaerobic Stabilization

DOI: 10.2478/v10265-012-0009-5

Keywords: Excess sludge, thermal disintegration, hydrolysis, anaerobic stabilization, degree of sludge fermentation, volatile fatty acids, chemical oxygen demand

Full-Text   Cite this paper   Add to My Lib

Abstract:

The factor which essentially affects sludge biodegradation rate is the degree of fluidization of insoluble organic polymers to the solved form, which is a precondition for availability of nutrients for microorganisms. The phases which substantially limit the rate of anaerobic decomposition include hydrolytic and methanogenic phase. Subjecting excess sludge to the process of initial disintegration substantially affects the effectiveness of the process of anaerobic stabilization. As a result of intensification of the process of hydrolysis, which manifests itself in the increase in the value and rate of generating volatile fatty acids (VFA), elongation of methanogenic phase of the process and increase in the degree of fermentation of modified sludge can be observed. Use of initial treatment of sewage sludge i.e. thermal disintegration is aimed at breaking microorganisms' cells and release of intracellular organic matter to the liquid phase. As a result of thermal hydrolysis in the sludge, the volatile fatty acids (VFA) are generated as early as at the stage of the process of conditioning. The obtained value of VFA determines the course of biological hydrolysis which is the first phase of anaerobic stabilization. The aim of the present study was to determine the effect of thermal disintegration of excess sludge on the effectiveness of the process of hydrolysis in anaerobic stabilization i.e. the rate of production of volatile fatty acids, changes in the level of chemical oxygen demand (COD) and increase in the degree of reduction in organic matter. During the first stage of the investigations, the most favourable conditions of thermal disintegration of excess sludge were identified using the temperatures of 50°C, 70°C, 90°C and heating times of 1.5 h - 6 h. The sludge was placed in laboratory flasks secured with a glass plug with liquid-column gauge and subjected to thermal treatment in water bath with shaker option. Another stage involved 8-day process of anaerobic stabilization of raw and thermally disintegrated excess sludge. Stabilization was carried out in mesophilic temperature regime i.e. at 37°C, under periodical conditions. In the case of the process of anaerobic stabilization of thermally disintegrated excess sludge at the temperature of 50°C and heating time of 6 h (mixture B) and 70°C and heating time of 4.5% (mixture C), the degree of fermentation of 30.67% and 33.63%, respectively, was obtained. For the studied sludge, i.e. mixture B and mixture C, maximal level of volatile fatty acids i.e. 874.29 mg CH3COOH/dm3 and 1131.43 mg CH3COOH/dm3 was found on the 2nd day of the process. The maximal obtained value of VFA was correlated on this day with maximal COD level, which was 1344 mg O2/dm3 for mixture B and 1778 mg O2/dm3 for mixture C.

Full-Text

comments powered by Disqus