Device and method for treating sulfate wastewater

Abstract

The invention belongs to the technical field of wastewater treatment, in particular to a method and a device for treating sulfate wastewater. The treatment method comprises the following steps of: performing first-stage anaerobic treatment, namely adding ethanol into wastewater to be treated, and performing first-stage anaerobic treatment by using an anaerobic expanded bed, wherein a sulfate reduction reaction and methane fermentation are basically finished in a first-stage anaerobic reactor; and performing second-stage anaerobic treatment, namely finishing sulfate blow-off, anaerobic sludge precipitation and further second-stage anaerobic treatment in a combined precipitator. The sulfate reduction amount is extremely low in the second-stage anaerobic treatment process, but 30 to 70 percent of organic matters can be removed; and chemical oxygen demand (COD) removal efficiency rises along with the reduction in first-stage anaerobic amount so as to ensure that the whole set of system has a higher level of organic matter removal efficiency. The treatment device comprises an anaerobic expanded bed reactor, the combined precipitator, a water inlet pump, a backflow pump and the like. The device and the method have good treatment effects on high-concentration sulfate wastewater; and by the device and the method, the organic matter removal efficiency and methane fermentation efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment device and method for sulfate waste water. Background technique [0002] In recent years, the pollution of sulfate wastewater has become increasingly serious, and a large number of industrial wastewater containing high concentrations of sulfate have emerged in many production areas, such as chemical, pharmaceutical, leather, paper, fermentation, food processing and mining, etc., and sulfate wastewater It has the characteristics of large polluted area, long incubation period and difficult treatment. Among the well-known water pollution problems in the Huaihe River Basin, sulfate-rich monosodium glutamate wastewater is the second largest source of pollution. In addition, the groundwater in many cities in my country has been polluted by sulfates to varying degrees. Therefore, seeking an effective sulfate wastewater treatment process has become...

AI Technical Summary

Problems solved by technology

However, the huge amount of solid waste calcium sulfate produced by the neutralization method is difficult to dispose of, causing serious secondary pollution

The treatment of acid mine wastewater by wetland method has the advantages of less investment, low operating cost, and easy management; however, the wetland method covers a large area, and the treatment is greatly affected by the environment, and the treatment of sulfur is not thorough, and the residual H 2 S escapes from the soil and enters the atmosphere, polluting the environment, and the wetland method also needs certain natural conditions, so the wetland method is limited in application

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