Optimization of sewage sludge conditioning and pressure dewatering by statistical modelling

Saveyn, Hans; Curvers, Daan; Thas, Olivier; Meeren, Paul Van der

doi:10.1016/j.watres.2007.09.029

Cited by 45 publications

(9 citation statements)

References 19 publications

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“…Both sludge reduction and sludge reutilization are good strategies for sewage sludge treatment and disposal. The bottleneck of sludge pretreatment is the barrier of cell wall and the membrane composition of complex organic materials that are not readily biodegradable, therefore sludge pretreatment technologies are of great interest in recent researches to enhance anaerobic digestibility of waste activated sludge (WAS) for biogas production [3,4], to improve dewatering of excess sludge for reducing sludge volume [5,6], to recover nutrients (nitrogen and phosphorus) from sludge [7,8], to reduce sludge production [1,9]. Nowadays, among these sludge pretreatment technologies based on physical, chemical and biological methods [1], microwave (MW) is emerging as a promising method for WAS disintegration.…”

Section: Introductionmentioning

confidence: 99%

Effect of H2O2 dosing strategy on sludge pretreatment by microwave-H2O2 advanced oxidation process

Wang

Wei

Liu

2009

Journal of Hazardous Materials

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a b s t r a c t Considering characteristics of breaking down H 2 O 2 into water and molecular oxygen by catalase in waste activated sludge (WAS), the effect of H 2 O 2 dosing strategy on sludge pretreatment by the advanced oxidation process (AOP) of microwave-H 2 O 2 was investigated by batch experiments for optimizing H 2 O 2 dosage. Results showed that the catalase in sludge was active at the low temperature range between 15• C and 45• C, and gradually lost activity from 60• C to 80• C. Therefore, the H 2 O 2 was dosed at 80• C, to which the waste activated sludge was first heated by the microwave (MW), and then the sludge dosed with H 2 O 2 was continuously heated till 100• C by the microwave. Results at different H 2 O 2 dosages showed that the higher the H 2 O 2 dosing ratio was, the more the SCOD and total organic carbon (TOC) were released into the supernatant, and the optimum range of H 2 O 2 /TCOD ratio should be between 0.1 and 1.0. The percentages of consumed H 2 O 2 in the AOP of microwave and H 2 O 2 treating the WAS were 25.38%, 22.53%, 14.82%, 13.61% and 19.63% at different H 2 O 2 /TCOD dosing ratios of 0.1, 0.5, 1, 2, 4, respectively. Along with the increasing H 2 O 2 /TCOD ratio, the contents of TCOD on particles, soluble substances and mineralization increased and the TCOD distribution on solids decreased.

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Section: Introductionmentioning

confidence: 99%

Effect of H2O2 dosing strategy on sludge pretreatment by microwave-H2O2 advanced oxidation process

Wang

Wei

Liu

2009

Journal of Hazardous Materials

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“…Organic polyelectrolytes are synthetic or natural compounds widely used especially for the coagulation and flocculation of activated sludge from wastewater treatment plant (Nguyen 2008;Saveyn et al 2008). These biodegradable chemicals (Cameron 2000;Nakamiya and Kinoshita 1995) usually replace the application of metal salts (mainly aluminum or iron salts).…”

Section: Discussionmentioning

confidence: 99%

Organic flocculants for the removal of phytoplankton biomass

2011

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The formation of noxious phytoplankton blooms causes deterioration of water quality in aquaculture ponds and reservoirs, but also in swimming pools and aquaria. We have studied the effects of selected cationic polyacrylamides on natural phytoplankton community, which was investigated by a decrease of chlorophyll a content in the water column and photosynthetic activity of phytoplankton floccules. Results indicate that cationic polyacrylamides are able to remove more than 80% of phytoplankton biomass. Moreover, no cell damage or lysis was observed by microscopic observation after flocculation. To our knowledge, this is the first report suggesting the removal of cyanobacterial blooms by organic flocculants. Cationic polyacrylamides are biodegradable organic flocculants with low toxicity to aquatic organisms, and seem to be a prospective tool with a possibility for algal or cyanobacterial bloom management in aquaculture.

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“…According to the studies reported in the scientific literature (Friehmelt et al, 1995;Miller et al, 1998;Barton et al, 1999;Gingerich et al, 1999;Lee et al, 2002;Saveyn et al, 2005Saveyn et al, , 2006Saveyn et al, , 2008Mahmoud et al, 2013), which highlighted that application of the electric field at the start of the whole dewatering run, in the filtration stage, did not show any beneficial effect to the dewatering result, the additional effect of an electric field applied (U-EDW or I-EDW) is investigated during compression stage in this paper. The dewatering process consists of two successive stages:…”

Section: Dewatering Proceduresmentioning

confidence: 99%

Electro-dewatering of wastewater sludge: An investigation of the relationship between filtrate flow rate and electric current

et al. 2015

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Optimization of sewage sludge conditioning and pressure dewatering by statistical modelling

Cited by 45 publications

References 19 publications

Effect of H2O2 dosing strategy on sludge pretreatment by microwave-H2O2 advanced oxidation process

Effect of H2O2 dosing strategy on sludge pretreatment by microwave-H2O2 advanced oxidation process

Organic flocculants for the removal of phytoplankton biomass

Electro-dewatering of wastewater sludge: An investigation of the relationship between filtrate flow rate and electric current

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