Coagulation-crossflow microfiltration of domestic wastewater

Al-Malack, Muhammad H.; Anderson, G. K.

doi:10.1016/0376-7388(96)00165-2

Cited by 58 publications

(31 citation statements)

References 12 publications

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“…Albased or Fe-based salts could form a series of cationic hydrolytic species and weakly charged or uncharged precipitates after reacting with water (Stumm and Morgan, 1996;O'Melia, 1998). Al-Malack and Anderson (1996) determined the optimal coagulation conditions for wastewater which was 200 mg/L FeCl 3 at pH 9.0, and the chemical oxygen demand (COD) removal efficiency by this optimal dose of FeCl 3 was about 99.3%. Aguiar et al (1996) found that the optimal dose of coagulant was 2.1 AE 0.2 mg Fe per mg of total organic carbon (TOC).…”

Section: Introductionmentioning

confidence: 99%

Effect of low dosage of coagulant on the ultrafiltration membrane performance in feedwater treatment

Liu

et al. 2014

Water Research

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Low dosageCritical dose Ultrafiltration Flux decline a b s t r a c t One of the critical issues for the widely application of ultrafiltration (UF) in water treatment is membrane fouling owning to the dissolved organic matter. The aim of the present study is to explore the effect of various particle sizes caused by low dosages of coagulant with dissolved organic matter on the UF membrane performance. Aluminum chloride was added to the synthetic water with the hydrophobic humic acid (HA), the hydrophilic bovine serum albumin (BSA) e a protein-and their 1:1 (mass ratio) mixture. The results showed that there was a critical dose of Al that could cause dramatic flux reduction by blocking the membrane pores after coagulating with HA/BSA. For HA or BSA, the critical dose of Al was relatively lower at pH 6.0 than that at pH 8.0. After coagulation, the flux decline caused by HA was slightly varied as a function of pH while that caused by BSA was greatly affected by pH. The flux decline caused by the 1:1 (mass ratio) HA/BSA mixture after coagulation was similar to that caused by HA after coagulation because BSA could be encapsulated by HA. In addition, the peak value of the molecular weight (MW) distribution of HA coagulated with Al was changed more drastically compared to that of BSA after filtration. ª

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Section: Introductionmentioning

confidence: 99%

Effect of low dosage of coagulant on the ultrafiltration membrane performance in feedwater treatment

Liu

et al. 2014

Water Research

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“…Al-Malack et al [3] have studied the effect of alum, polyaluminium silicate sulfate (PASS) and lime as flocculants on the performance of cross-flow microfiltration of domestic wastewater. Chapman et al [4] showed the importance of A pretreatment of adsorption, on the other hand, can remove the dissolved organics.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of adsorption–flocculation–microfiltration hybrid system in wastewater reuse

Guo

Vigneswaran

Ngo

et al. 2004

Journal of Membrane Science

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Membrane hybrid systems are becoming increasingly important as cost effective solutions in wastewater treatment and reuse. The effects of pretreatment namely floating medium flocculation (FMF) and powdered activated carbon (PAC) adsorption on organic and phosphorus removal was studied. The FMF was found to increase the phosphorus removal up to 97%. This preflocculation improved the dissolved organic removal only marginally (from 20% to 40%) whilst the pretreatment of adsorption increased the organic removal to more than 98%. The decline in filtration (permeate) flux of microfiltration was reduced by the incorporation of these pretreatment methods. Detailed studies on the effect of PAC dose indicated that a PAC dose of 1g/L was the optimum in terms of organic removal and filtration flux. PAC doses in excess of 1g/L contributed to a significant decrease in filtration flux.The critical flux was experimentally evaluated for crossflow microfiltration (CFMF) with and without the pretreatment. The pretreatment of adsorption led to six times higher critical flux than that without any pretreatment. The preflocculation 2 alone did not significantly increase the critical flux. There was only a 33% increase with preflocculation. However, the preflocculation combined with PAC adsorption resulted in nine times higher critical flux.The results showed that a pretreatment of flocculation and adsorption led to almost complete phosphorus and organic removal while reducing the membrane clogging.

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“…It is caused by the gradual build-up on the membrane surface (cake layer formation), which may consist of colloidal particles, iron and/or manganese oxides, and a biofilm, or may be due to inorganic scale formation (Casey 1997). In order to control cake formation, two types of action can be undertaken: (a) prevent the particles from reaching the membrane; these include the use of air diffusers under the membrane, filtration aids, coagulants and electro-filtration and (b) flush the particles out; periodic backwashing, ultrasound fields and pulsated flow are intended to remove the particles already located in the membrane or at its surface (Al-Malack and Anderson 1996). In this study, air diffusers and back-flush techniques were used to prevent the fouling of the membrane.…”

Section: Introductionmentioning

confidence: 99%

Microfiltration of pretreated sanitary landfill leachate

2011

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A laboratory study using a bench scale model of two units operation involving coagulation process with Moringa oleifera seeds extract as a coagulant and filtration process using hollow fibre microfiltration membrane, was adopted to treat Air Hitam Sanitary Landfill leachate in Puchong, Malaysia. The performance of the microfiltration membrane in pretreated sanitary landfill leachate treatment was investigated through a continuous process. The leachate sample was passed through conventional coagulation process before being filtered through a hollow fibre microfiltration membrane of 0.1 lm surface pores. The hollow fibre microfiltration membrane decreased the turbidity, colour, total suspended solids, total dissolved solids and volatile suspended solids in the leachate by 98. 30, 90.30, 99.63, 14.71 and 20%, respectively. The results showed that microfiltration is capable of removing high percentage of solids from leachate and might be considered as a polishing stage after on-site biological treatment for sanitary landfill leachate.

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Coagulation-crossflow microfiltration of domestic wastewater

Cited by 58 publications

References 12 publications

Effect of low dosage of coagulant on the ultrafiltration membrane performance in feedwater treatment

Effect of low dosage of coagulant on the ultrafiltration membrane performance in feedwater treatment

Experimental investigation of adsorption–flocculation–microfiltration hybrid system in wastewater reuse

Microfiltration of pretreated sanitary landfill leachate

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