Evaluation of continuous mesophilic, thermophilic and temperature phased anaerobic digestion of microwaved activated sludge

Coelho, N.; Droste, Ronald L.; Kennedy, Kevin J.

doi:10.1016/j.watres.2011.02.032

Cited by 141 publications

(51 citation statements)

References 28 publications

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“…Although a faster stable state was achieved in the MW-two stage reactor (data not shown), the daily methane production was not further improved compared with the MW-one stage reactor. This was mostly due to biogas production in the first stage reactor even though the SRT was controlled at 2 days as proposed by Coelho et al (2011), to avoid excessive methanization in the first stage reactor. It was found that increasingly more methane was produced daily in the first stage reactor (data not shown).…”

Section: Performance Of the Anaerobic Digestersmentioning

confidence: 99%

“…In the U.S., the amount of biosolids annually generated from stabilized sewage sludge is greater than 8 million dry tons (Peccia and Westerhoff, 2015). Due to the characteristics of sewage sludge, including the high degree of water bounding (Coelho et al, 2011), low biodegradability (Kuglarz et al, 2013) and existence of chemical pollutants, such as heavy metals, pathogens and persistent organic pollutants (Hua et al, 2008), sludge treatment and disposal present rising challenges for wastewater treatment plants (WWTPs). It is well known that sewage sludge is a non-Newtonian fluid, that exhibits rheological characteristics, such as shear-thinning, thixotropy, yielding properties and viscoelasticity (Campbell and Crescuolo, 1982;Chaari et al, 2003;Dick and Ewing, 1967;Eshtiaghi et al, 2013;Seyssiecq et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

et al. 2016

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a b s t r a c tThe rheological behavior of sludge is of serious concern in anaerobic digestion. This study investigated the rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H 2 O 2 pretreatment (MW-H 2 O 2 ). The results showed that MW-H 2 O 2 pretreatment resulted in the improvement of sludge flowability and weakening of its viscoelastic properties. Further positive effects on the rheological properties of digested sludge during anaerobic digestion were observed. The flowability was improved with a low level of apparent viscosity. The decrease of the consistency index and increase of the flow behavior index indicated that the strength of the inner structures and non-Newtonian flow characteristics of digested sludge weakened. Both the storage modulus (G 0 ) and loss modulus (G 00 ) decreased, indicating that the viscoelastic behavior became weak. These effects were possibly attributed to the changes of the digested sludge micro-structures, such as extracellular polymeric substances (EPS). This study concluded that anaerobic digestion for treating sewage sludge combined with pretreatment is a more favorable option than single anaerobic digestion from the perspective of rheology.

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Section: Performance Of the Anaerobic Digestersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

et al. 2016

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“…Cell wall disruption or destruction is considered as an effective way of enhancing AD efficiency of SS which is mainly composed of microbial cells within an extra-cellular polymeric floc matrix (Baier and Schmidheiny, 1997), because hydrolysis was enhanced through SS pretreatment by releasing the intracellular organics that were easily biodegraded. Microwave pretreatment (MW) of SS (MW-SS) was widely investigated to enhance the AD efficiency of SS, and volatile solids (VS) removal, methane production and AD stabilization were improved (Coelho et al, 2011). Meanwhile, the effects of microwave pretreatment of FW (MW-FW) on AD were investigated, while contrary results existed.…”

Section: Introductionmentioning

confidence: 99%

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Zhang

Tong

et al. 2016

Bioresource Technology

204

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“…Apart from the online measurements, the operation was monitored in terms of solids, CODcr, volatile fatty acids (VFAs), NH 3 -N, and TP twice or three times weekly. The period lasted till the variations of the factors were observed \10 % over the average values, and the digester was considered as basically stable (Coelho et al 2011;Jang et al 2014). During the second period, a continuous feeding at a relatively low organic load rate (OLR) with SRT kept at 20 days was applied for 1 month.…”

Section: Anaerobic Digestionmentioning

confidence: 99%

Removal of typical pharmaceutically active compounds in sewage sludge using mesophilic and thermophilic anaerobic digestion processes

Zhou

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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The removal of four pharmaceutically active compounds, i.e., anti-inflammatory painkiller diclofenac (DCF), lipid-regulating agent clofibric acid (CFA), epilepsy drugs carbamazepine (CBM), and broad-spectrum anti-bacterial agent triclosan (TCS), present in sewage sludge was investigated using anaerobic digestion processes in the mesophilic and thermophilic modes. Sludge retention times (SRTs) were set at 10, 15, and 20 days, respectively, for the mesophilic mode and 7, 15, and 20 days, respectively, for the thermophilic mode. The effective isolation and purification pre-treatment to extract the target compounds from the sewage sludge samples were firstly established, followed by gas chromatographymass spectrometer analysis to identify and quantify them. The removal efficiencies of the target compounds could be raised to a certain extent with the increase on SRTs, especially under the mesophilic condition. The removal of CFA and TCS under thermophilic condition hardly varied when the SRTs were above 15 days. All the compounds could be partly removed from the sewage sludge under the two temperature conditions, particularly TCS that was reduced by about 74 %. Besides, CFA, firstly reported in this study, could be reduced by maximal 65 %. On the whole, the thermophilic mode was more conducive to the removal of CBM and TCS, but did not have a noticeable effect on the removal of CFA. Furthermore, DCF could be better removed in the mesophilic mode. In addition, NH 3 -N accumulation in this measured range might positively affect the removal of the selected compounds, particularly in the mesophilic mode.

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Evaluation of continuous mesophilic, thermophilic and temperature phased anaerobic digestion of microwaved activated sludge

Cited by 141 publications

References 28 publications

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

Rheological properties of sewage sludge during enhanced anaerobic digestion with microwave-H2O2 pretreatment

Optimization and microbial community analysis of anaerobic co-digestion of food waste and sewage sludge based on microwave pretreatment

Removal of typical pharmaceutically active compounds in sewage sludge using mesophilic and thermophilic anaerobic digestion processes

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