Influences of influent carbon source on extracellular polymeric substances (EPS) and physicochemical properties of activated sludge

Chemosphere ◽  
2011 ◽  
Vol 84 (9) ◽  
pp. 1250-1255 ◽  
Author(s):  
FenXia Ye ◽  
Ge Peng ◽  
Ying Li
Keyword(s):  
Carbon Source ◽  
Physicochemical Properties ◽  
Activated Sludge ◽  
Extracellular Polymeric Substances

A Review on Utilization of Organic Matters in Activated Sludge

2013 ◽  
Vol 773 ◽  
pp. 353-361
Author(s):  
Guang Jie Duan ◽  
Rui Jing Su ◽  
Deng Xin Li
Keyword(s):  
Wastewater Treatment ◽  
Physicochemical Properties ◽  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Land Reclamation ◽  
Chemical Compositions ◽  
Organic Matters ◽  
Treatment Practices ◽  
Treatment And Disposal ◽  
And Function

Activated sludge process has been applied worldwide in municipal and industrial wastewater treatment practices. Excess sewage sludge, produced in sedimentation after wastewater bio-treatment, is an inevitable by-product of wastewater treatment processes. In any case sludge treatment and disposal should always be considered as an integral part of treatment of wastewater. Currently, the most widely available options in the world are the agriculture utilization, the waste disposal sites, the land reclamation and restoration, the incineration and other novel uses. Extracellular polymeric substances (EPS), as high-molecular weight compounds are secreted by activated sludge microorganisms, which can significantly influence the physicochemical properties and function of activated sludge flocs. Because of the crucial roles of EPS, many researchers have been made to explore their chemical compositions and physicochemical properties. Polysaccharides, humic substances and proteins are usually found to be the major components of EPS. The present paper sought to review past and future trends in sludge handling, focusing mainly at the organic matters.

The activated sludge metabolic characteristics changing sole carbon source from readily biodegradable acetate to toxic phenol

2016 ◽  
Vol 73 (10) ◽  
pp. 2324-2331 ◽  
Author(s):  
Changyong Wu ◽  
Yuexi Zhou ◽  
Jiamei Song
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Carbon Sources ◽  
Oxygen Demand ◽  
Metabolic Characteristics ◽  
Microbial Products ◽  
Intracellular Storage

A sequencing batch reactor was used to investigate the effect of carbon sources on the metabolism of activated sludge. Acetate and phenol, with the chemical oxygen demand (COD) of 330–350 mg L−1, was used as the carbon source in Periods I and II, respectively. Acetate decreased in the initial 120 min with the intracellular storage materials (XSTO), extracellular polymeric substances (EPS), and the soluble microbial products (SMP) accumulating to 131.0 mg L−1, 347.5 mg L−1, and 35.5 mg L−1, respectively. Then, XSTO and EPS decreased to 124.5 mg L−1 and 340.0 mg L−1, respectively, in the following 120 min. When acetate was replaced by phenol, it could not be used at the beginning due to its toxicity. The XSTO decreased from 142 mg L−1 to 54.6 mg L−1 during the aeration period. The EPS had a significant increase, with the highest value of 618.1 mg L−1, which then decreased to 245.6 mg L−1 at 240 min. The phenol was gradually degraded with the acclimation and it can be fully degraded 18 d later. Meanwhile, the usage ratio of the internal carbon source decreased. The effluent SMP in Period II was 1.7 times that in Period I.

Study of factors affecting simultaneous nitrification and denitrification (SND)

1999 ◽  
Vol 39 (6) ◽  
pp. 61-68 ◽  
Author(s):  
Klangduen Pochana ◽  
Jürg Keller
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Physical Phenomenon ◽  
Treatment Plant ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Factors Affecting ◽  
Floc Size ◽  
Sludge Flocs ◽  
Activated Sludge Systems

Experiments have been performed to gain an understanding of the conditions and processes governing the occurrence of SND in activated sludge systems. Sequencing batch reactors (SBRs) have been operated under controlled conditions using the wastewater from the first anaerobic pond in an abattoir wastewater treatment plant. Under specific circumstances, up to 95% of total nitrogen removal through SND has been found in the system. Carbon source and oxygen concentrations were found to be important process parameters. The addition of acetate as an external carbon source resulted in a significant increase of SND activity in the system. Stepwise change of DO concentration has also been observed in this study. Experiments to determine the effect of the floc size on SND have been performed in order to test the hypothesis that SND is a physical phenomenon, governed by the diffusion of oxygen into the activated sludge flocs. Initial results support this hypothesis but further experimental confirmation is still required.

Roles of extracellular polymeric substances (EPS) in the migration and removal of sulfamethazine in activated sludge system

2013 ◽  
Vol 47 (14) ◽  
pp. 5298-5306 ◽  
Author(s):  
Juan Xu ◽  
Guo-Ping Sheng ◽  
Ying Ma ◽  
Long-Fei Wang ◽  
Han-Qing Yu
Keyword(s):  
Activated Sludge ◽  
Extracellular Polymeric Substances ◽  
Activated Sludge System
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