Industrial wastewater treatment in India
For several years Witteveen+Bos has been supporting a gelatine-producing company in India in treating its wastewater. Several production processes cause two wastewater flows that require treatment. The first flow is treated separately because of its very high salinity and to facilitate the reuse of water from the other flow. The second is pre-treated in an Upflow Anaerobic Sludge Blanket reactor (UASB), followed by aerobic post-treatment for further purification and nitrogen removal.
The treated wastewater is upgraded for use in the production process by sand filtration and membrane filtration. The UASB was overloaded in January 2015, when several events caused a complete loss of activity and insufficient performance. Witteveen+Bos provided daily consulting in March and April, and successfully restarted the UASB. An operations manual was produced at the same time, listing responses to off-spec conditions in the treatment process and wastewater composition values. Witteveen+Bos will also develop alternatives to increase the treatment capacity and to optimise performance. The excess sludge costs and UASB treatment capacity are both matters of concern in light of future production expansions.