Effect of hexavalent chromium on extracellular polymeric substances of granular sludge from an aerobic granular sequencing batch reactor

Wang, Zichao; Gao, Mengchun; Wang, Sen; Xin, Yanjun; Ma, Dong; She, Zhigang; Wang, Zhe; Chang, Qingbo; Ren, Yun

doi:10.1016/j.cej.2014.04.078

Cited by 104 publications

(39 citation statements)

References 46 publications

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“…The broad absorption band between 3200 and 3400 cm À1 in the spectrum was assigned to the stretching vibrations of the OeH groups of polymeric substances Tapia et al, 2009). The peaks from 2925 to 2935 and 2850-2860 cm À1 demonstrated the existence of aliphatic chains of polysaccharides, proteins and humic substances Wang et al, 2014). Chai et al (2007) reported that the absorption of wavelengths between 2930 and 1650 cm À1 was related to humic acids (stretching vibrations of C] C).…”

Section: Ftir Analysismentioning

confidence: 99%

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

et al. 2016

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a b s t r a c tThe effects of combined calcium peroxide (CaO 2 ) oxidation with chemical re-flocculation on dewatering performance and physicochemical properties of waste activated sludge was investigated in this study. The evolutions of extracellular polymeric substances (EPS) distribution, composition and morphological properties were analyzed to unravel the sludge conditioning mechanism. It was found that sludge filtration performance was enhanced by calcium peroxide oxidation with the optimal dosage of 20 mg/ gTSS. However, this enhancement was not observed at lower dosages due to the absence of oxidation and the performance deteriorated at higher dosages because of the release of excess EPS, mainly as proteinlike substances. The variation in soluble EPS (SEPS) component can be fitted well with pseudo-zero-order kinetic model under CaO 2 treatment. At the same time, extractable EPS content (SEPS and loosely bound EPS (LB-EPS)) were dramatically increased, indicating sludge flocs were effectively broken and their structure became looser after CaO 2 addition. The sludge floc structure was reconstructed and sludge dewaterability was significantly enhanced using chemical re-flocculation (polyaluminium chloride (PACl), ferric iron (FeCl 3 ) and polyacrylamide (PAM)). The inorganic coagulants performed better in improving sludge filtration dewatering performance and reducing cake moisture content than organic polymer, since they could act as skeleton builders and decrease the sludge compressibility.

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Section: Ftir Analysismentioning

confidence: 99%

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

et al. 2016

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“…A lab-scale plexiglass aerobic GSBR, similar to that used by Wang et al [12], was used in the present study. The aerobic GSBR had an internal diameter of 9 cm and an effective height of 90 cm.…”

Section: Reactor Set-up and Wastewater Compositionmentioning

confidence: 99%

Effects of salinity on performance, extracellular polymeric substances and microbial community of an aerobic granular sequencing batch reactor

Wang

Gao

She

et al. 2015

Separation and Purification Technology

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140

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“…could combine with heavy metal cations such as Cr (VI) to form a protective barrier, thereby hindering the intracellular penetration of heavy metals and alleviating their toxicities [23]. The bacteria viability results showed that the percentage of viable bacteria decreased from 78% to 50-71% after exposure to 25 mg Cr (VI)/L for 32 hours among the tested pH levels (i.e.…”

Section: Effect Of Ph On Direct Cr (Vi) Bio-reductionmentioning

confidence: 93%

Direct Cr (VI) bio-reduction with organics as electron donor by anaerobic sludge

Qian

Zhou

Wang

et al. 2017

Chemical Engineering Journal

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Industrial activities produce lots of Cr (VI)-containing wastewater. This study presented a detailed work on direct Cr (VI) bio-reduction (i.e. Cr (VI) is reduced with organics as electron donor directly) by anaerobic sludge through both batch and long-term experiments. Effects of pH and initial Cr (VI) concentrations on direct Cr (VI) bioreduction activity were evaluated. The highest direct Cr (VI) bio-reduction rate was

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Effect of hexavalent chromium on extracellular polymeric substances of granular sludge from an aerobic granular sequencing batch reactor

Cited by 104 publications

References 46 publications

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

Enhancement of waste activated sludge dewaterability using calcium peroxide pre-oxidation and chemical re-flocculation

Effects of salinity on performance, extracellular polymeric substances and microbial community of an aerobic granular sequencing batch reactor

Direct Cr (VI) bio-reduction with organics as electron donor by anaerobic sludge

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