Evaluating sedimentation problems in activated sludge treatment plants operating at complete sludge retention time

被引：44
|
作者：
Amanatidou, Elisavet [1 ]
Samiotis, Georgios [1 ]
Trikoilidou, Eleni [1 ]
Pekridis, George [1 ]
Taousanidis, Nikolaos [2 ]
机构：
[1] Technol Educ Inst Western Macedonia, Environm Engn Pollut Control Dept, Environm Chem & WasteWater Treatment Lab, Kozani 50100, Greece
[2] Technol Educ Inst Western Macedonia, Dept Mech Engn, Kozani 50100, Greece
来源：
WATER RESEARCH | 2015年 / 69卷
关键词：
Activated sludge; Complete sludge retention; Zero net biomass; Sedimentation problems; Sludge flotation; Floc trapped nitrogen; WASTE-WATER TREATMENT; FLOCCULATION; MINIMIZATION;
D O I：
10.1016/j.watres.2014.10.061
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Zero net sludge growth can be achieved by complete retention of solids in activated sludge wastewater treatment, especially in high strength and biodegradable wastewaters. When increasing the solids retention time, MLSS and MLVSS concentrations reach a plateau phase and observed growth yields values tend to zero (Y-obs approximate to 0). In this work, in order to evaluate sedimentation problems arised due to high MLSS concentrations and complete sludge retention operational conditions, two identical innovative slaughterhouse wastewater treatment plants were studied. Measurements of wastewaters quality characteristics, treatment plant's operational conditions, sludge microscopic analysis and state point analysis were conducted. Results have shown that low COD/Nitrogen ratios increase sludge bulking and flotation phenomena due to accidental denitrification in clarifiers. High return activated sludge rate is essential in complete retention systems as it reduces sludge condensation and hydraulic retention time in the clarifiers. Under certain operational conditions sludge loading rates can greatly exceed literature limit values. The presented methodology is a useful tool for estimation of sedimentation problems encountered in activated sludge wastewater treatment plants with complete retention time. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：20 / 29
页数：10
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