Determination of the effect of cations and cationic polyelectrolytes on the characteristics and final properties of synthetic and activated sludge

Nguyễn, Tấn Phong; Hilal, Nidal; Hankins, Nicholas P.; Novak, John T.

doi:10.1016/j.desal.2007.01.161

Cited by 31 publications

(12 citation statements)

References 25 publications

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“…The difference in cake compactibility can be explained by the low Ca 2 + concentration in the wastewater in the case of sample D3 (*100 ppm) compared to the samples D1 and D2 (*800 ppm). The effect of Ca 2 + in the water surrounding the sludge flocs on its dewaterability was shown in the past by CST measurements on sludge samples of this WWTP (Peeters and Herman, 2007) and is described in literature (Higgins et al, 2004;Nguyen et al, 2008).…”

Section: Resultsmentioning

confidence: 98%

Polyelectrolyte Flocculation of Waste Activated Sludge in Decanter Centrifuge Applications: Lab Evaluation by a Centrifugal Compaction Test

Peeters

Dewil

Impe

et al. 2011

Environmental Engineering Science

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#155). AbstractThis article introduces a centrifugal compaction (spin tube) test to thoroughly evaluate polyelectrolyte conditioning on lab scale. In contrast to the well-known and widely applied existing tests (e.g., the beaker, the Jar settling, the free drainage, and the [sheared] capillary suction time test), the proposed spin tube test has a clear relation with the dewatering process taking place in a decanter centrifuge. First, based on the theory of centrifugal compaction, the solids stress of separate layers of sludge cake (obtained after spinning sludge in a lab centrifuge) is calculated. Next, the test was applied to assess in the lab the performance of three different polymers by evaluating the obtained sludge dryness. To verify and/or compare the results obtained with the spin tube tests, sheared capillary suction time tests were conducted and floc size distributions were analyzed. Finally, two of the three polymers evaluated in the lab were applied in the industrial sludge dewatering and drying system used at the wastewater treatment plant of Monsanto Antwerp in Belgium. Observed field performance was in perfect accordance with the spin tube tests.

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Section: Resultsmentioning

confidence: 98%

Polyelectrolyte Flocculation of Waste Activated Sludge in Decanter Centrifuge Applications: Lab Evaluation by a Centrifugal Compaction Test

Peeters

Dewil

Impe

et al. 2011

Environmental Engineering Science

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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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“…The divalent cation bridging theory (DCBT) has been used to describe interactions between divalent cations in wastewater and the extracellular polymeric substances (EPS) produced by microbes in activated sludge systems. [15][16][17][18][19][20][21][22][23][24][25] According to the DCBT, divalent cations like Ca þþ bridge the negatively charged functional groups present on the biopolymers. This bridging helps to aggregate and stabilize the matrix of biopolymers and individual bacteria, promoting good floc formation, improvement in sludge settling, and sludge dewatering.…”

Section: Operational Experiences Changing Sludge Settleability and Dementioning

confidence: 99%

Mechanical Dewatering and Thermal Drying of Sludge in a Single Apparatus

Peeters

2010

Drying Technology

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This article describes the Centridry 1 technology (marketed in the UK by Euroby Ltd.) used at the Monsanto wastewater treatment plant in Antwerp, Belgium, for handling excess wastewater-activated sludge. In one single enclosed machine, sludge with an initial solids concentration of 1.5 to 4% w/w dry substance is mechanically dewatered with a high-solids decanter centrifuge and thermally dried in a flash dryer, yielding a final product with a concentration of solids ranging from 80 to 95% w/w dry substance. Operational experience with varying sludge characteristics affecting the fouling sensitivity of the system is presented for the Centridry technology at the Monsanto plant in Antwerp.

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Determination of the effect of cations and cationic polyelectrolytes on the characteristics and final properties of synthetic and activated sludge

Cited by 31 publications

References 25 publications

Polyelectrolyte Flocculation of Waste Activated Sludge in Decanter Centrifuge Applications: Lab Evaluation by a Centrifugal Compaction Test

Polyelectrolyte Flocculation of Waste Activated Sludge in Decanter Centrifuge Applications: Lab Evaluation by a Centrifugal Compaction Test

Organic flocculants for the removal of phytoplankton biomass

Mechanical Dewatering and Thermal Drying of Sludge in a Single Apparatus

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