Sewage sludge disintegration by combined treatment of alkaline + high pressure homogenization

Zhang, Yuxuan; Zhang, Panyue; Zhang, Guangming; Ma, Wing-Kin; Wu, Hao; Ma, Boqiang

doi:10.1016/j.biortech.2012.07.078

Cited by 40 publications

(23 citation statements)

References 26 publications

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“…Similar results using this method had Zhang et al [18]. Kim et al [2] conducted alkaline pre-treatment at pH 12 with several alkaline agents: NaOH, KOH, Mg(OH) 2 and Ca(OH) 2 .…”

Section: Resultssupporting

confidence: 68%

“…Therefore, pH start of the anaerobic digesters should be monitored at a pH lower than 8.0 after the alkali-treated sludge is fed into the digesters. Mostly, alkalization is used witch some other disintegration methods (sonification [10,17], thermal pretreatment [10], high pressure homogenization [18]) to increase the efficiency of whole process but usually this is financially unfavorable cause of a high energy expending process.…”

Section: Resultsmentioning

confidence: 99%

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Impact of Alkalization of Surplus Activated Sludge on Biogas Production

Grűbel¹,

Machnicka²

2013

Ecological Chemistry and Engineering S

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Large amounts of sludge are produced in biological wastewater treatment plants. Since the sludge is highly contaminated, it has to undergo proper stabilization before it is disposed or utilized in an environmentally safe way. On the whole, the aim of bacterial cell disintegration is the release of cell contents in the form of an aqueous extract. Chemical disintegration of surplus activated sludge by alkalization results in destruction and disruption of the flocs and microorganisms as well as increase concentration of organic matter in supernatant. The mesophilic anaerobic sewage sludge digestion is an established process, most often applied at medium and large municipal sewage treatment plants. Four major steps of anaerobic digestion are distinguished. The first hydrolysis step leads to solubilization of insoluble particulate matter and biological decomposition of organic polymers to monomers or dimers. The hydrolysis step is recognized as the rate-limiting step of the following second and third steps, the processes of acidogenesis and acetogenesis. Chemical disintegration activates biological hydrolysis and, therefore, it can significantly increase the stabilization rate of the secondary sludge. It has been shown that when the activated sludge was subjected to alkalization to pH 9.0 value, the COD concentration increased from 101 to 530 mg/dm 3 in sludge supernatant. The paper presents a potential application of chemical disintegration for sewage sludge (mainly activated sludge) to upgrading biogas production.

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“…Similar results using this method had Zhang et al [18]. Kim et al [2] conducted alkaline pre-treatment at pH 12 with several alkaline agents: NaOH, KOH, Mg(OH) 2 and Ca(OH) 2 .…”

Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Impact of Alkalization of Surplus Activated Sludge on Biogas Production

Grűbel¹,

Machnicka²

2013

Ecological Chemistry and Engineering S

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“…Kavitha et al (2013) proposed that sludge could be treated with complexing agents to convert the sludge as an improved substrate for enzyme action. Other reports investigated the methods involving improvement of the diffusion effectiveness of EPS by altering the EPS feature to enhance the disintegration of flocs matrix (Yuxuan et al 2012).The extracellular enzymes played more significant roles in wastewater treatment process than intracellular enzymes (Confer and Logan 1998).…”

Section: Linkage Between Eps and Hydrolasementioning

confidence: 99%

Various Sludge Pretreatments: Their Impact on Biogas Generation

Banu

Kavitha

2017

Waste Biomass Management – A Holistic Approach

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Biogas produced through anaerobic degradation of waste activated sludge (WAS) in wastewater treatment plants has gained much more attention as it is a renewable energy resource. An apparent advantage of anaerobic digestion is the generation of biogas that presents a renewable substitute for utilization of fossil fuels. It was observed that pretreatment has to be done prior to anaerobic degradation (AD) to enhance the biogas generation. This review deals with various pretreatments-chemical, physical, mechanical, combinative, phase-separated pretreatment, their mode of action, advantages and their impact on biogas generation. An extensive review of these pretreatment techniques could plausibly aid in increasing the biogas production and thus rises the sustainable energy generation.

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“…Additionally, Zhang et al (2012) managed to make the two stage (hybrid) disintegration process result in a further pronounced increase in organic matter dissolution. Similar results were presented in our previous article (Grübel et al 2013).…”

Section: Hybrid Was Disintegrationmentioning

confidence: 99%

Low intensity surplus activated sludge pretreatment before anaerobic digestion

Suschka¹,

Grűbel²

2017

Archives of Environmental Protection

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Sewage sludge (municipal, or industrial) treatment is still a problem in so far that it is not satisfactorily resolved in terms of cost and fi nal disposal. Two common forms of sludge disposal are possible; the fi rst being direct disposal on land (including agriculture) and the second being incineration (ash production), although neither of these methods are universally applied. Simplifying the issue, direct sludge disposal on land is seldom applied for sanitary and environmental reasons, while incineration is not popular for fi nancial (high costs) reasons. Very often medium and large wastewater treatment plants apply anaerobic digestion for sludge hygiene principles, reducing the amount to be disposed and for biogas (energy) production. With the progress in sewage biological treatment aiming at nutrient removal, primary sludge has been omitted in the working processes and only surplus activated sludge requires handling. Anaerobic digestion of waste activated sludge (WAS) is more diffi cult due to the presence of microorganisms, the decomposition of which requires a relatively long time for hydrolysis. In order to upgrade the hydrolysis effects, several different pre-treatment processes have already been developed and introduced. The additional pre-treatment processes applied are aimed at residual sludge bulk mass minimization, shortening of the anaerobic digestion process or higher biogas production, and therefore require additional energy. The water-energy-waste Nexus (treads of) of the benefi ts and operational diffi culties, including energy costs are discussed in this paper. The intensity of pre-treatment processes to upgrade the microorganism's hydrolysis has crucial implications. Here a low intensity pre-treatment process, alkalisation and hydrodynamic disintegration -hybrid process -were presented in order to achieve suffi cient effects of WAS anaerobic digestion. A sludge digestion effi ciency increase expressed as 45% biogas additional production and 52% of the total or volatile solids reduction has been confi rmed.

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Sewage sludge disintegration by combined treatment of alkaline + high pressure homogenization

Cited by 40 publications

References 26 publications

Impact of Alkalization of Surplus Activated Sludge on Biogas Production

Impact of Alkalization of Surplus Activated Sludge on Biogas Production

Various Sludge Pretreatments: Their Impact on Biogas Generation

Low intensity surplus activated sludge pretreatment before anaerobic digestion

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