Novel two stage bio-oxidation and chlorination process for high strength hazardous coal carbonization effluent
| Autor: | Tapas Nandy, Pravin Manekar, Manikavasagam Karthik, Rima Biswas |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Hazardous Waste
Environmental Engineering Halogenation Hydraulic retention time Nitrogen Health Toxicology and Mutagenesis India Industrial Waste Ammonia chemistry.chemical_compound Environmental Chemistry Extended aeration Coal Coke Waste Management and Disposal Effluent Autotrophic Processes Bacteria Waste management Chemistry Carbonization business.industry Heterotrophic Processes Nitrification Pollution Carbon Biodegradation Environmental business Oxidation-Reduction |
| Zdroj: | Journal of Hazardous Materials. 189:92-99 |
| ISSN: | 0304-3894 |
| Popis: | Effluent generated from coal carbonization to coke was characterized with high organic content, phenols, ammonium nitrogen, and cyanides. A full scale effluent treatment plant (ETP) working on the principle of single stage carbon–nitrogen bio-oxidation process (SSCNBP) revealed competition between heterotrophic and autotrophic bacteria in the bio-degradation and nitrification process. The effluent was pretreated in a stripper and further combined with other streams to treat in the SSCNBP. Laboratory studies were carried on process and stripped effluents in a bench scale model of ammonia stripper and a two stage bio-oxidation process. The free ammonia removal efficiency of stripper was in the range 70–89%. Bench scale studies of the two stage bio-oxidation process achieved a carbon–nitrogen reduction at 6 days hydraulic retention time (HRT) operating in an extended aeration mode. This paper addresses the studies on selection of a treatment process for removal of organic matter, phenols, cyanide and ammonia nitrogen. The treatment scheme comprising ammonia stripping (pretreatment) followed by the two stage bio-oxidation and chlorination process met the Indian Standards for discharge into Inland Surface Waters. This treatment process package offers a techno-economically viable treatment scheme to neuter hazardous effluent generated from coal carbonization process. |
| Databáze: | OpenAIRE |
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