Ferric chloride for odour control: studies from wastewater treatment plants in India | Zendy

T.C. Prathna | Zendy; Ankit Srivastava | Zendy

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Ferric chloride for odour control: studies from wastewater treatment plants in India

Author(s) -

T.C. Prathna,

Ankit Srivastava

Publication year - 2020

Publication title -

water practice and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.243

H-Index - 15

ISSN - 1751-231X

DOI - 10.2166/wpt.2020.111

Subject(s) - ferric , wastewater , chloride , chemistry , sewage treatment , biochemical oxygen demand , phosphate , ammoniacal nitrogen , chemical oxygen demand , environmental chemistry , pulp and paper industry , nuclear chemistry , environmental engineering , inorganic chemistry , environmental science , organic chemistry , engineering

This study was about the feasibility of using ferric chloride as an agent for odour control in wastewater treatment plants (WWTPs) due to hydrogen sulphide emission. Total inlet sulphide concentrations at 11 WWTPs in Delhi were measured and ranged between 1.1 and 14.8 mg/L. Wastewater samples from Najafgarh drain were used in jar tests to estimate the ferric chloride concentration required to obtain acceptable treatment. Ferric chloride was effective in removing sulphide, phosphate and total suspended solids (TSS), and gave significant biological oxygen demand (BOD) reduction. It was ineffective, however, in removing ammoniacal-nitrogen. A dose of 40 mg/L removed 76% of total sulphide, which corresponds to a significant reduction in hydrogen sulphide emission. The study demonstrated that ferric chloride can be used as a cost-effective pre-treatment step in WWTPs to reduce sulphur-related odours significantly, as well as TSS, BOD and phosphate from wastewater.

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