EFECTS OF HIGH LEVEL OF TOTAL DISSOLVED SOLIDS ON THE TREATMENT OF A HIGH STRENGTH ORGANIC CHEMICAL WASTEWATER
Biological treatment of industrial wastewaters with high levels of total dissolved solids (TDS) is often a challenge due to decreased organics removal rates and poor sludge settleability. Hence, it is often necessary to define the threshold concentration of TDS for effective biological treatment of a particular wastewater. In this case, bench-scale biological (activated sludge) treatability studies were conducted on a wastewater generated from an organic chemical industry. The TDS present in wastewater that was investigated were primarily chlorides. Based on the treatability studies, it was determined that an activated sludge system can be operated effectively at the TDS concentration range of 2 to 3 percent or lower. The sludge settling characteristics were generally good at the TDS concentration of below 3 percent. The treatment performance deteriorated when the reactor TDS concentration increased beyond 4 percent. The sludge settling characteristics were also poor (dispersed solids) beyond the reactor TDS concentration of 4 percent.
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Document Type: Research Article
Publication date: 2000-01-01
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