Sludge granulation and efficiency of phase separator in UASB reactor treating combined industrial effluent

Sludge granulation and the effect of gas-liquid-solid separator （GLSS） design on the efficiency of upflow anaerobic sludge blanket （UASB） and upflow anaerobic sludge filter （UASF） reactors, operating at HRTs ranging from 3 to 12 h was investigated. VSS/TS ratio gradually increased in both the reacto...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2007, Vol.19 (5), p.553-558
Main Authors: Yasar, Abdullah, Ahmad, Nasir, Chaudhry, Muhammad Nawaz, Khan, Aamir Amanat Ali
Format: Article
Language:English
Subjects:
Bioreactors
Dairying
gas-liquid-solid (GLS) phase separator
Industrial Waste - analysis
microbial growth
sludge granulation
UASB
UASB反应器
Waste Disposal, Fluid
X-Ray Diffraction
废水处理
污泥颗粒化
混合工业排水
相分离器效率
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Summary:Sludge granulation and the effect of gas-liquid-solid separator （GLSS） design on the efficiency of upflow anaerobic sludge blanket （UASB） and upflow anaerobic sludge filter （UASF） reactors, operating at HRTs ranging from 3 to 12 h was investigated. VSS/TS ratio gradually increased in both the reactors with increasing sludge age （from 0.5 to more than 0.7 for UASB reactor and 0.012 to 0.043 for UASF reactor）. X-Ray diffraction analysis of the UASF sludge showed the presence of expanding clays revealing its additional absorption capability. Fuoraphyllite and albite precipitation related to excellular polymers of the microbial shell structure, showed the extended growth of microorganisms during sludge granulation. A gradual decrease （82%-69%） in COD removal with decreasing HRT was apparent in UASF reactor. In case of UASB reactor, this decrease was marginal because addition of GLSS device significantly improved （14%-20%） the overall efficiency of the UASB reactor. GLSS enhanced the efficiency of the UASB reactor by increasing the settleability of suspended particles and accelerating the coagulation of colloidal particles due to the velocity gradient.
ISSN:1001-0742
1878-7320
DOI:10.1016/s1001-0742(07)60092-8