Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

Journal of Environmental Health Science Engineering

Kavita Gandhi¹  Rubina Chaudhary²  Chandan Singh² 

[1] National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India;School of Energy and Environmental Studies, Devi Ahilya University, Indore, Takshashila Campus, Khandwa Road, Indore, M.P, India

关键词: Hydrogen peroxide;    Parabolic trough collector;    Solar photocatalysis;    Synthetic high organic wastewater;   

Others  :  821064
DOI  :  10.1186/1735-2746-10-13

 received in 2012-08-09, accepted in 2013-01-13,  发布年份 2013

【 摘 要 】

In the present study, solar photocatalytic oxidation has been investigated through laboratory experiments as an alternative to conventional secondary treatment for the organic content reduction of high COD wastewater. Experiments have been performed on synthetic high COD wastewater for solar photocatalytic oxidation using a parabolic trough reactor. Parameters affecting the oxidation of organics have been investigated.

The experimental design followed the sequence of dark adsorption studies of organics, followed by photolytic studies (in absence of catalyst) and finally photocatalytic studies in presence and absence of additional oxidant (H₂O₂). All the experimental studies have been performed at pH values of 2, 4, 6,8,10 and the initial pH value of the wastewater (normal pH). For photocatalytic studies, TiO₂ has been used as a photocatalyst. Optimization of catalyst dose, pH and H₂O₂ concentration has been done. Maximum reduction of organic content was observed at the normal pH value of the wastewater (pH = 6.8). The reaction rate was significantly enhanced in presence of hydrogen peroxide. The optimum pH other than the Normal was in the alkaline range. Acidic pH was not found to be favourable for organic content reduction. pH was found to be a dominant factor affecting reaction rate even in presence of H₂O₂ as an additional oxidant. Also, the solar detoxification process was effective in treating a waste with a COD level of more than 7500 mg/L, which is a otherwise a difficult waste to treat. It can therefore be used as a treatment step in the high organic wastewater treatment during the primary stage also as it effectively reduces the COD content by 86%.

【 授权许可】

   
2013 Singh et al.; licensee BioMed Central Ltd.

【 图 表 】

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