Process for treating desulfurization waste liquid by using ammonia still

• Main Authors: SUN YEXIN, MA CHUNYING, SUN CHENXI, LIN JINLIANG, LIANG WENLEI, JI CHANGXIA, ZHANG FAN, HAN RUIJUN, ZHAO XIUXIU, WANG YONGLI, WANG MIJUN, LI KE, HAN MIN, JIAO QINGLIANG
• Format: Patent
• Language: Chinese; English
• Published: 25.08.2023
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a process for treating desulfurization waste liquid by using an ammonia still, which is characterized in that vacuum carbonate desulfurization in a coking plant uses a potassium carbonate solution to absorb H2S and HCN in coal gas, and belongs to wet absorption method coke oven gas desulfurization. In actual operation, in order to adjust the content of potassium carbonate in circulating desulfurization liquid, reduce the content of secondary salt and ammonium salt and guarantee the desulfurization and decyanation effect, a small amount of desulfurization barren liquor and part of vacuum condensate, namely desulfurization waste liquor, need to be discharged. Due to the fact that sulfur and cyanogen in desulfurization waste liquid are high in concentration and extremely high in toxicity to microorganisms, normal physiological metabolism of the microorganisms can be inhibited, serious impact is caused to biochemical treatment of waste water, a biochemical treatment system cannot operate s