High-concentration wastewater from coal chemical industry has attracted widespread attention because of complex composition, high concentration of pollutants, high toxicity and low biodegradability. It not only contains ammonia nitrogen, phenols and oil compounds with high concentration, but also contains highly toxic pollutants such as heterocyclic compounds and polycyclic aromatic hydrocarbons (PAHs). High-efficiency dephenolization and deep detoxification are the two major bottlenecks in wastewater treatment. In this work, the phenolic?oil co-extraction synergistic detoxification technology was proposed from the perspective of process pollution control, and the special extractant IPE-PO was used to treat the high-concentration wastewater from coal chemical industry in Yunnan. The organic matter in the wastewater before and after treatment was detected by GC?MS, and compared with methyl isobutyl ketone (MIBK) extraction system which was used in industrially widely. After treatment using IPE-PO extractant, the average removal rates of chemical oxygen demand (COD), total phenol, ammonia nitrogen (NH4+?N) and absorbance of organic matters at 254 ?nm (UV254) were 77.69%, 90.45%, 97.10% and 82.19%, respectively. Most of the toxic pollutants were removed, and the biodegradability of the wastewater was improved significantly. There were 101 kinds of organic matters in the raw water, after IPE-PO process, the types of organic compounds were reduced to 74 kinds. The process showed ascendancy in the treatment of toxic matters. After biochemical and advanced treatment, the COD of wastewater reduced from 31000~37000 mg/L to less than 100 mg/L, and the UV254 of wastewater reduced from 197 cm?1 to 0.5 cm?1, which meet the wastewater discharge standard of China. Compared with the MIBK extraction system, the deep detoxification ability of the technology was proved. The operating cost does not exceed 10 yuan/t wastewater. The phenol?oil synergistic co-extraction detoxification technology with IPE-PO extractant is a feasible and efficient pretreatment method for coal chemical wastewater treatment.
Hongbin CAO Gaojie XU Pengge NING Shaoyuan SHI
. Co-extraction and synergistic detoxification technology and its application in high-concentration wastewater from coal chemical industry[J]. The Chinese Journal of Process Engineering, 2019
, 19(S1)
: 81
-92
.
DOI: 10.12034/j.issn.1009-606X.219163
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