Wastewater treatment and water reuse of food processing industries. Part II: Techno-economic study of a membrane separation technique

Hafez, Azza; Khedr, Maaly; Gadallah, Hanaa

doi:10.1016/j.desal.2006.11.010

Cited by 40 publications

(20 citation statements)

References 3 publications

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“…These dosages are in line with literature findings on wash-water from root vegetables and leafy greens, which are also very limited (Hafez et al 2007, Van Haute et al 2015.…”

Section: Settling With Candfsupporting

confidence: 76%

“…C&F is widely used in the wastewater and food industry to precipitate out particulate and dissolved matter (Hafez et al 2007;Van Haute et al 2015). The three types of coagulants commonly used in C&F are metal salts (alum or ferric sulfate), polyelectrolytes (polymers) which are effective but expensive, and natural (chitosan) (Renault et al 2009;Ahmad et al 2004).…”

Section: Coagulation and Flocculation Process (Candf)mentioning

confidence: 99%

“…Review of the literature shows that some work has been done on understanding the physical, chemical, and microbial qualities of wash-water and wastewater from different fruit and vegetable washing and processing operations (Casani et al 2005;Hafez et al 2007;Kato et al 2013; Kern et al 2006;Lehto et al 2014Lehto et al , 2009Ölmez and Kretzschmar 2009;Mundi 2013;Mundi and Zytner 2015). However, due to the large variation in values, growers still ask the question, what wash-water treatment process will work best for them.…”

Section: Introductionmentioning

confidence: 99%

“…The result is large volumes of potable waters are used, thereby generating equally large amounts of wastewater, typically referred to as wash-water (Casani et al 2005;Hafez et al 2007;Kato et al 2013; Kern et al 2006;Lehto et al 2014Lehto et al , 2009Mundi 2013;Mundi and Zytner 2015;Ölmez and Kretzschmar 2009). This wash-water may contain heavy loads of solids in the form of dissolved and particulate matter, high levels of organic matter and solids from peeling processes, elevated levels of chemical and biochemical oxygen demand (COD and BOD), nutrients (nitrogen & phosphorus) and pathogens.…”

Section: Introductionmentioning

confidence: 99%

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Fruit and vegetable wash-water characterization, treatment feasibility study and decision matrices

2017

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On average, it is estimated that up to 5 liters of wastewater is generated per kg of produce in postharvest processing of fruit, leafy greens and root vegetables. The typical wastewater parameters vary in concentration (solids content, COD, BOD, nitrogen, phosphorus) based on the produce being processed. The challenge for producers and regulators is that the selection of the appropriate treatment technology is challenging, so decision matrices were developed to narrow down the treatment selections. Wash-waters for different types of fruit and vegetables from two different operation types, washing only vs. washing and processing. Bench-scale treatments selected for testing included settling, coagulation and flocculation with settling, centrifuge, dissolved air flotation, electrocoagulation, screening, and hydrocyclone. The developed decision matrices summarize the removal effectiveness of the different treatments for typical wastewater parameters and serve as a reference tool in understanding wash-water treatment technologies and their effectiveness in treating various wash-waters.

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“…These dosages are in line with literature findings on wash-water from root vegetables and leafy greens, which are also very limited (Hafez et al 2007, Van Haute et al 2015.…”

Section: Settling With Candfsupporting

confidence: 76%

Section: Coagulation and Flocculation Process (Candf)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fruit and vegetable wash-water characterization, treatment feasibility study and decision matrices

2017

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“…Regulations for other applications, such as boiler make-up water or warm cleaning water, are even more stringent. There has been a study on the possibilities for reuse of vapor condensate in a milk processing company (dried milk production) as boiler make-up water (Hafez et al, 2007), and the reuse of chiller shower water in a meat processing company (sausage production) as warm cleaning water (Mavrov & Bélières, 2000).…”

Section: Membrane Applications In Food Industry For Wastewater Treatmentmentioning

confidence: 99%

Membrane Separation Process in Wastewater Treatment of Food Industry

Muro¹,

Riera²,

Díaz³

2012

Food Industrial Processes - Methods and Equipment

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Modeling and transport parameters during nanofiltration of degreasing effluent from a tannery

Prabhavathy

2011

Asia-Pacific J Chem Eng

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Degreasing effluent from a tannery is treated using a single-step membrane separation (nanofiltration) process in continuous cross-flow mode. The flow regimes encompass the laminar and turbulent zones, including laminar flows with turbulent promoters. Experimental results are reported in the range of transmembrane pressure drop from 828 to 1242 kPa for all three flow regimes. More than 50% flux enhancement is observed by using turbulent promoters compared to purely laminar flow. The performance criteria of the filtration are evaluated in terms of chemical oxygen demand (COD), total dissolved solids (TDS), total solids (TS), pH and conductivity of the permeate. The proposed scheme successfully reduces COD to well below the permissible limits (250 mg/l). A combination of osmotic pressure and solution-diffusion model is used for nanofiltration. Three relevant transport coefficients, namely, the effective osmotic coefficient, solute diffusivity and solute permeability through the membrane are estimated by minimising the sum of errors between the experimental and calculated

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Wastewater treatment and water reuse of food processing industries. Part II: Techno-economic study of a membrane separation technique

Cited by 40 publications

References 3 publications

Fruit and vegetable wash-water characterization, treatment feasibility study and decision matrices

Fruit and vegetable wash-water characterization, treatment feasibility study and decision matrices

Membrane Separation Process in Wastewater Treatment of Food Industry

Modeling and transport parameters during nanofiltration of degreasing effluent from a tannery

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