Spent caustic streams from the downstream of the oil and gas industry consist of very high Chemical Oxygen Demand (COD) levels and several other hazardous contaminants such as sulfides, mercaptans, sodium salts etc. Due to these contaminants in refinery spent caustic, these wastewaters are difficult to treat and very harmful to the environment. Consequently, spent caustic wastewater treatments can be both challenging and expensive.
These complex wastewaters are difficult to treat using conventional processes. Traditionally, various spent caustic disposal techniques were adopted for disposal of spent caustics such as: deep well injection, biological treatment with careful dosage, incineration, wet air oxidation or disposal off-site. Aquatech’s spent caustic wastewater treatment systems offer the best alternative to conventional treatment and disposal practices in terms of capital investment.