Research on application of"one-step"high efficiency flocculation technology for desulfurization wastewater pretreatment
In response to the disadvantages of the traditional coal-fired power plant flue gas desulfurization wastewater pretreatment process,such as:long process flow,multiple types of chemicals,numerous equipments,large occupation area,high engineering investment,poor treatment effect,and unstable water quality,a"one-step"high efficiency flocculation pretreatment process and the corresponding powdered high efficiency flocculant were developed.A test on the"one-step"high efficiency flocculation pretreatment of reclaimed water and flue gas desulfurization wastewater was studied with the engineering application carried out at the same time.The results showed that under the conditions of a fast mixing stirring speed of 90 r/min,hydraulic retention time of 5 min-utes;flocculation reaction stirring speed of 60 r/min,hydraulic retention time of 30 min;and clarification time of 60 minutes,the water quality after treatment was stable,and all indicators could stably met the pollutants dis-charge requirements of DUT 997-2020 Water quality control standard of wastewater from lime stone-gyp sum wet flue gas desulfurization system in coal-fired power plant.The formed flocs were compact,making it easy to dehy-drate and dry,and the moisture content of the dehydrated mud cake met the requirement of not higher than 60％in GB/T 23485-2009 Disposal of sludge from municipal wastewater treatment plant-Quality of sludge for co-landfilling,the toxic leaching index of the dehydrated mud cake met the limit value stipulated in GB 5085.3-2007 Identification standards for hazardous wastes-Identification for extraction toxicity.The"one-step"process has significantly reduced the volume and number of required equipments by simplifying the treatment process,thereby greatly reducing the engineering investment,system energy consumption,and operating and maintenance costs,which provides a feasible solution for efficient,economic and environmental protection treatment of desul-furization wastewater from coal-fired power plant.
desulfurization wastewaterwastewater treatmenthigh efficiency flocculationcoal-fired power plant
万方数据
维普
