Comprehensive Utilization of Fastener Cleaning Wastewater and Waste Residue Passed Expert Appraisal

The acidic iron-containing sewage produced in the fastener production process has caused pollution to the environment, and has always been a major industrial malaise that has been a headache for enterprises and the masses. Recently, the Fastener Cleaning Wastewater Comprehensive Utilization Project implemented by the National Standard Parts Product Quality Supervision and Inspection Center and Haiyan Hitech Standard Parts Ru0026D Co., Ltd. has recently passed expert appraisal. The stubborn disease that plagued the traditional industry of fasteners has been cured in Haiyan. .

The raw material of fastener companies is rolls of steel, and a layer of rust will form on the surface when stored. Most manufacturers use hydrochloric acid pickling to remove rust, which produces a large amount of iron-containing sewage. Before the sewage is discharged into the pipe network, the manufacturer uses lime to neutralize it. The high-cost production also brings a large amount of industrial sludge, which leads to secondary pollution. The fastener cleaning wastewater and waste residue comprehensive utilization project has been put into trial production on a small scale. The reporter saw in the workshop that the red-yellow pickling wastewater was adjusted and filtered by lime milk and then entered a closed reaction tank body, which was catalyzed by the catalyst. , The water flowing out is colorless and tasteless. The treated water can be recycled, and the by-product iron yellow is left inside the reaction tank, which can be used as a pigment. Each ton of waste water can produce about 0.006 tons of iron yellow, the market price is about 24 yuan, and the additional profit is 3.58 yuan. According to the calculation of the output of sea salt fasteners, the county produces about 1.75 million tons of cleaning wastewater, and about 10,500 tons of sludge is generated after neutralization. If 80% of the cleaning wastewater can be treated in this way, it can bring about 33.6 million yuan to the manufacturer every year Increasing the output value can also reduce the pressure on the sewage pipe network.