Desulfurization wastewater softening pretreatment equipment and treatment method thereof

Abstract

The invention relates to desulfurization wastewater softening pretreatment equipment and a treatment method thereof. The desulfurization wastewater softening pretreatment equipment comprises a first-order reaction tank, wherein a discharging hole of the first-order reaction tank is connected with a first feeding hole of a dehydration unit, a discharging hole of the dehydration unit is connected with a second-order reaction tank, a discharging hole of the second-order reaction tank is connected with a filter unit, a discharging hole of the filter unit is connected with a sludge conveying pipeline, the sludge conveying pipeline comprises a first pipeline and a second pipeline, the first pipeline is connected with a desulfurization device, the second pipeline is connected with a second feeding hole of the dehydration device, an independent vent is formed in the desulfurization device, and a detection device is arranged on the vent. Therefore, calcium carbonate precipitates generated by the second-order reaction tank can be directly reused in a desulfurization system, a tubular membrane and a ceramic membrane can be difficultly polluted or plugged, a cleaning period is prolonged, and operating cost is reduced. Most of soluble silicon is precipitated in the first-order reaction tank, and after solid-liquid separation is carried out by virtue of a dehydrator, the phenomenon that sodium carbonate in the second-order reaction tank dissolves calcium silicate precipitates instead can not appear.

Description

technical field [0001] The invention relates to a processing device and a processing method thereof, in particular to a desulfurization wastewater softening pretreatment device and a processing method thereof. Background technique [0002] Sulfur dioxide (chemical formula SO2) is one of the main causes of air pollution and an important cause of acid rain. It is one of the main pollutants in the atmosphere. The gas is emitted during volcanic eruptions and is also produced in many industrial processes. Since coal and petroleum typically contain elemental sulfur, sulfur dioxide is formed when burned. When sulfur dioxide dissolves in water, sulfurous acid is formed. If sulfurous acid is further oxidized in the presence of PM2.5, sulfuric acid will be produced rapidly and efficiently. This is one reason for concern about the environmental effects of using these fuels as energy sources. [0003] As of the end of 2010, my country's total control target for the "Eleventh Five-Ye...

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Problems solved by technology

[0011] The disadvantages of these processes are: when the concentration of magnesium ions and sulfate ions contained in the incoming water is high, the resulting sediment is not easy to separate, the clarifier takes up a large area, and the quality of the effluent water is difficult to guarantee, and the dosage is huge and easy. The added lime and sodium carbonate react directly, and if the desulfurization wastewater contains a large amount of supersaturated calcium sulfate suspension, a large amount of sodium carbonate agent will be consumed to react with it to form calcium carbonate and sodium sulfate, resulting in high agent cost

Long process flow leads to high investment costs and occupies a large area

Various fouling and scaling problems are prone to occur, and the filter and membrane separation system are frequently backwashed and chemically cleaned

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