This newspaper (Zhang Wangpei Qianbo reporter Cao Jigen) has caused pollution caused by acidic iron-containing sewage generated in the fastener production process. It has always been a major industry malpractice for enterprises to “headache†and mass “cutting teethâ€. Recently, the National Standard Parts Product Quality Supervision and Inspection Center and Haiyan Haitaike Standard Parts R&D Co., Ltd. implemented the “Fast-cleaning Wastewater Waste Slag Comprehensive Utilization†project recently passed the expert appraisal, which has plagued fasteners as a traditional industry. The cure.
The raw material of the fastener company is a roll of steel, which will form a layer of rust when stored. Most manufacturers use hydrochloric acid pickling to remove rust, resulting in a large amount of iron-containing sewage. Before the sewage is discharged into the pipe network, the manufacturer uses lime neutralization, and the high-cost production also brings a large amount of industrial sludge, resulting in secondary pollution. The fastener cleaning waste slag comprehensive utilization project has been implemented in small-scale trial production. The reporter saw in the workshop that the red-yellow pickling sewage was filtered and filtered by lime milk and entered a closed reaction tank. The water that flows out is colorless and tasteless. The treated water can be recycled. The by-product “iron yellow†is left inside the reaction tank. It can be used as a pigment. The waste water can produce about 0.006 tons of iron yellow per ton of wastewater. The market price is about 24 yuan, and the new profit is 3.58 yuan. According to the calculation of sea salt fastener production, the county produces about 1.75 million tons of cleaning wastewater annually, and about 10,500 tons of sludge is produced after neutralization. If 80% of the cleaning wastewater can be treated like this, it can bring 33.6 million yuan to the factory every year. Increasing production value can also reduce the pressure on the sewage pipe network. (Source: China Quality News)
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