Mixed treatment method for wastewater in 1,4-butanediol and ethanediol production

• Main Authors: LU JUN, ZHU JIANQIANG, TANG HONGJIAN, ZHANG HONGLEI, GUAN GANG, SHAN FURONG, WU BIN, LIU LU, ZHANG YONGLONG, MA YINSHAN
• Format: Patent
• Language: English
• Published: 13.05.2015
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention relates to a mixed treatment method for deionized high-concentration organic wastewater in 1,4-butanediol production and high-nitrate wastewater in production of ethanediol by a direct synthesis process for synthesis gas. The method comprises the steps of wastewater copper ion treatment, pH (potential of hydrogen) adjustment, precipitation/denitrification pretreatment, internal circulation anaerobic reaction treatment, hydrolytic acidification/aerobic biochemical reaction treatment, sludge precipitation, ozone strong oxidation pretreatment and biochemical reaction filter pond treatment which are carried out in sequence. The method not only is high in removal efficiency of COD (chemical oxygen demand) in the mixed wastewater and can effectively resist water quality change but also has the characteristics of simple flow process, easiness for implementation and the like. The method also can be applied to separate treatment of the deionized wastewater in the 1,4-butanediol production or the high-nitrate wastewater in the production of ethanediol by the direct synthesis process for synthesis gas as well as treatment of wastewater similar to the wastewater in the two production processes and similar high-concentration organic wastewater in other industries.