Strategy for minimization of excess sludge production from the activated sludge process

Liu, Yu; Tay, Joo‐Hwa

doi:10.1016/s0734-9750(00)00066-5

Cited by 214 publications

(108 citation statements)

References 35 publications

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“…Therefore, excess free energy would be directed away from anabolism so that the production of biomass can be reduced. Uncoupled metabolism is observed under some conditions, such as in the presence of inhibitory compounds, heavy metals, excess energy source, abnormal temperatures, and limitation of nutrients [8,56]. The uncoupling approach is to increase the discrepancy of energy (ATP) level between catabolism and anabolism so that energy supply to anabolism is limited.…”

Section: Uncoupling Metabolismmentioning

confidence: 99%

“…To reduce the production of biomass, wastewater processes must be engineered such that substrate is diverted from assimilation for biosynthesis to fuel exothermic, non-growth activities. Different strategies are currently developed for sludge reduction in an engineering way based on these mechanisms: lysiscryptic growth, uncoupling metabolism, maintenance metabolism, and predation on bacteria [1,[6][7][8]. This paper gives an overview of these strategies currently applied and studied for minimization of sludge production in biological wastewater treatment in order to seek an optimal solution.…”

Section: Introductionmentioning

confidence: 99%

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Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

623

278

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Excess sludge treatment and disposal currently represents a rising challenge for wastewater treatment plants (WWTPs) due to economic, environmental and regulation factors. There is therefore considerable impetus to explore and develop strategies and technologies for reducing excess sludge production in biological wastewater treatment processes. This paper reviews current strategies for reducing sludge production based on these mechanisms: lysis-cryptic growth, uncoupling metabolism, maintenance metabolism, and predation on bacteria. The strategies for sludge reduction should be evaluated and chosen for practical application using costs analysis and assessment of environmental impact. High costs still limit technologies of sludge ozonation-cryptic growth and membrane bioreactor from spreading application in full-scale WWTPs. Bioacclimation and harmful to environment are major bottlenecks for chemical uncoupler in practical application. Sludge reduction induced by oligochaetes may present a cost-effective way for WWTPs if unstable worm growth is solved. Employing any strategy for reducing sludge production may have an impact on microbial community in biological wastewater treatment processes. This impact may influence the sludge characteristics and the quality of effluent. r

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Section: Uncoupling Metabolismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

623

278

View full text Add to dashboard Cite

show abstract

“…On the other hand, the high organic load of these wastewaters may promote the excessive growth of biomass, that requires an increase in the air supply (López-Palau et al, 2009) and creates problems of sludge generation and disposal. The adopted strategy in this study is based on sludge reduction, as the production of excess sludge from the wastewater treatment plant is considered one of the serious problems encountered in the aerobic treatments (Liu & Tay, 2001). In this study, an aerobic step alternated with an anoxic one was adopted as a strategy.…”

Section: Ambb Treatmentmentioning

confidence: 99%

A Methodological Proposal For Corporate Carbon Footprint And Its Application To A Wine-producing Company In Galicia, Spain

2015

Toward a Sustainable Wine Industry

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“…Hence, the current legal constraints, rising costs, and public sensitivity of sewage sludge disposal have provided considerable impetus to explore and develop strategies and technologies for the minimization of sludge production (Wei et al, 2003a). Many methods have been developed for sludge reduc-tion, mainly based on the mechanisms of lysis-cryptic growth, uncoupling metabolism, maintenance metabolism, and predation on bacteria (Low and Chase, 1999;Liu and Tay, 2001;Wei et al, 2003aWei et al, , 2003b. Sludge reduction technologies based on the lysis-cryptic growth mechanism, such as sludge reduction with ozone pretreatment or thermal pretreatment, show great potential for practical application.…”

Section: Introductionmentioning

confidence: 99%

Optimization of H2O2 dosage in microwave-H2O2 process for sludge pretreatment with uniform design method

Xiao

Yan

Wei

et al. 2012

Journal of Environmental Sciences

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A microwave-H 2 O 2 process for sludge pretreatment exhibited high efficiencies of releasing organics, nitrogen, and phosphorus, but large quantities of H 2 O 2 residues were detected. A uniform design method was thus employed in this study to further optimize H 2 O 2 dosage by investigating effects of pH and H 2 O 2 dosage on the amount of H 2 O 2 residue and releases of organics, nitrogen, and phosphorus. A regression model was established with pH and H 2 O 2 dosage as the independent variables, and H 2 O 2 residue and releases of organics, nitrogen, and phosphorus as the dependent variables. In the optimized microwave-H 2 O 2 process, the pH value of the sludge was firstly adjusted to 11.0, then the sludge was heated to 80°C and H 2 O 2 was dosed at a H 2 O 2 :mixed liquor suspended solids (MLSS) ratio of 0.2, and the sludge was finally heated to 100°C by microwave irradiation. Compared to the microwave-H 2 O 2 process without optimization, the H 2 O 2 dosage and the utilization rate of H 2 O 2 in the optimized microwave-H 2 O 2 process were reduced by 80% and greatly improved by 3.87 times, respectively, when the H 2 O 2 :MLSS dosage ratio was decreased from 1.0 to 0.2, resulting in nearly the same release rate of soluble chemical oxygen demand in the microwave-H 2 O 2 process without optimization at H 2 O 2 :MLSS ratio of 0.5.

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Strategy for minimization of excess sludge production from the activated sludge process

Cited by 214 publications

References 35 publications

Minimization of excess sludge production for biological wastewater treatment

Minimization of excess sludge production for biological wastewater treatment

A Methodological Proposal For Corporate Carbon Footprint And Its Application To A Wine-producing Company In Galicia, Spain

Optimization of H2O2 dosage in microwave-H2O2 process for sludge pretreatment with uniform design method

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