Grey water treatment concept integrating water and carbon recovery and removal of micropollutants

A total treatment concept was developed for grey water from 32 houses in Sneek, The Netherlands. A thorough characterization of COD, nutrients, metals, micropollutants and anions was carried out. Four biological treatment systems were tested: aerobic, anaerobic, combined anaerobic + aerobic and a bioflocculation system. Micropollutants were measured in grey water and effluent from three biological treatment systems. The best performing biological treatment system, the aerobic one showed the highest COD and micropollutant removal at a low sludge yield. The bioflocculation system could concentrate 70% of the COD of grey water into a concentrated stream. Advanced treatment with ozone and activated carbon showed to be effective to remove all micropollutants below limits of quantification. A total treatment system is proposed based on the pre-treatment with a bio-flocculation system, aerobic post-treatment and ozonation as a disinfection and micropollutant removal step.

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Treatment of tannery wastewater using aluminium formate: influence of the formate over sulphate based coagulant

Global NEST Journal ◽

10.30955/gnj.002528 ◽

2018 ◽

Vol 20 (3) ◽

pp. 458-464 ◽

Cited By ~ 2

Keyword(s):

Biological Treatment ◽

Treatment System ◽

Tannery Wastewater ◽

Counter Anion ◽

Aluminium Sulphate ◽

Turbidity Removal ◽

Mechanistic Approach ◽

Coagulant Activity ◽

Pre Treatment ◽

Biological Treatment System

<p>Tannery industries provoke the conspicuous quantity of deleterious effluent which has to be treated prior to discharge into the environment. Pre-treatment of tannery wastewater with aluminium sulphate is well known over decades, but due to the corrosive nature of sulphate this pre-treated water causes several issues in the biological treatment system. To overcome this issue a study was performed to understand the coagulant activity of aluminium formate and aluminium sulphate. The effect of coagulant activity as a function of pH and coagulant dose of Aluminium formate was studied and found that it surpassed aluminium sulphate in terms of Cr(VI), sulphate and COD removal by 10%, 6% and 10% respectively, while turbidity removal for both coagulants was found approximately equal. Possible mechanistic approach to the coagulation property of aluminium formate and aluminium sulphate could be inter particle bridging and sweep coagulation respectively. Formate [HCOO-] can be utilized as a counter anion in the place of commonly used sulphate anions as it is biodegradable, non-toxic and corrosive free compound. Therefore, Aluminium formate can be a promising coagulant for the pre-treatment of tannery wastewater.</p>

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Chemical Solubilization of Particulate Organics as a Pretreatment Approach

Water Science & Technology ◽

10.2166/wst.1992.0718 ◽

1992 ◽

Vol 26 (9-11) ◽

pp. 2289-2292 ◽

Cited By ~ 22

Author(s):

S. R. Mukherjee ◽

A. D. Levine

Keyword(s):

Enzymatic Hydrolysis ◽

Alkaline Hydrolysis ◽

Industrial Waste ◽

Biological Treatment ◽

Organic Waste ◽

Experimental Studies ◽

Organic Content ◽

Treatment System ◽

Chemical Pretreatment ◽

Biological Treatment System

The first step degradation of particulate organic waste is solubilization. In a bioreactor, solubilization occurs due to enzymatic hydrolysis. As an alternative, the use of chemical solubilization methods may provide a means of more efficiently solubilizing the particulates to a form that can be readily utilized by a biological treatment system. In this study, an industrial waste high in particulate organic content was used as a test substrate. The chemical pretreatment methods tested were alkaline hydrolysis, oxidation, and a mixture of hydrolysis and oxidation. Experimental studies to elucidate the effects of chemical pretreatment on the characteristics of particulate organics are discussed in this paper.

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