Journal
WATER SCIENCE AND TECHNOLOGY
Volume 67, Issue 9, Pages 1960-1966Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2013.072
Keywords
Bacillus sp SCUN; biological treatment; high saline wastewater; ternary cycle treatment
Funding
- Wuhan City Key Project [201160638171]
- Hubei Province Key Project [2012FFA114]
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The material of this study is provided by biological aerobic treatment of high saline wastewater from pesticide production. The microorganism used for biodegradation has been identified by gene-sequencing as a strain of Bacillus sp. SCUN. The best growth condition for the salt-tolerant microorganism has been studied by varying the pH, immobilized microorganism dosage and temperature conditions. The feasibility of pretreating wastewater in ethyl chloride production containing 4% NaCl has been discussed. It was found that under the pH range of 6.0-8.0, immobilized microorganism dosage of 1.5 g/L, temperature of 30 degrees C, and NaCl concentration of 0-3%, the microorganism achieves the best growth for biodegradation. After domestication, the strain can grow under 4% NaCl. This salt-tolerant microorganism is effective in the pretreated high saline wastewater. With a newly developed ternary cycle treatment, the chemical oxygen demand removal approaches 58.3%. The theoretical basis and a new method for biological treatments in biodegradation of high saline wastewater in ethyl chloride production are discussed.
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