Study on Facile and Full-Scale Reuse Treatment of Wastewater Produced from Tail Gas Oxidation-Absorption Technology of Natural Gas Purification Plant

The oxidation-absorption technology of tail gas is perfect for natural purification plants to ensure the up-to-standard discharge sulfur dioxide emissions, but it can produce a large amount wastewater. In this paper, facile and full-scale reuse treatment strategy based on sequential combination disc tube reverse osmosis low-temperature low-pressure evaporation desalination was proposed studied. produced light yellow wastewater acid sulfate-rich organic wastewater, in which sulfate ions (SO42−) existed up 6479 mg/L, chemical oxygen demand (COD), 5-day biochemical (BOD5), total carbon (TOC), ammonia nitrogen (ammonia-N), (TN) suspended solid (SS) were 207, 71.9, 67.6, 1.28, 70.5 20.9 respectively. After treatment, there COD (6 mg/L), BOD5 (1.4 TOC (0.9 TN (2.07 SS mg/L) SO42− (90 permeated water, condensate water with (11 (2.3 (4.3 (2 (1.2 obtained. Thereby, pollution indexes reduced after so as meet quality standard (GB/T18920-2022) China, recovery rate reached 98.2 vol%. Ultimately, priority pollutant migration mechanism during process determined.