System for treating desulfurization wastewater of coal-fired power plant by magnetic coagulation

Abstract

The invention relates to a system for treating desulfurization wastewater of a coal-fired power plant by magnetic coagulation. The system consists of a dosing tank, a stirring device, a stirring speeddistribution box, a water inlet controller, a rotary decanter, a submersible sewage pump and a rotary drum type magnetic mud sorting device. The treatment course comprises the following specific steps: the desulfurization wastewater enters a reactor from the bottom through a water inlet controller; a PAC coagulant and magnetic powder are added from the dosing tank, stirring is conducted for 1 minat a speed of 50 r / min, a PAM coagulant aid is added, stirring is conducted for 2 min at a speed of 250 r / min, stirring is conducted for 6 min at a speed of 50 r / min, standing is conducted for 30 minafter stirring is finished, supernatant in the reactor is guided out through the rotary decanter, desulfurization wastewater is injected, the above operations are repeated, the water outlet controller is turned on when bottom flocs reach the maximum storage capacity, the bottom flocculate is conveyed into a magnetic mud separator for separation, the separated magnetic powder can be repeatedly utilized, and the sludge is subjected to solidification treatment.

Description

technical field [0001] The invention belongs to the related field of sewage treatment, and in particular relates to a system for magnetic coagulation treatment of desulfurization wastewater in coal-fired power plants. Background technique [0002] The quality of desulfurization wastewater from coal-fired power plants is complex, with a large amount of suspended solids, salts, heavy metals, and COD. Especially the problem of high suspended solids, which is too high and difficult to settle will affect the treatment of other wastewater pollutants. At present, there are a large amount of fine particles in the desulfurization wastewater of coal-fired power plants that use gypsum desulfurization. The particulate matter in desulfurization wastewater is small, and it is often impossible to remove it by natural sedimentation in a high-salt environment. Therefore, it is often necessary to add a coagulant to the wastewater to solve the problem of high suspended solids through coagula...

AI Technical Summary

Problems solved by technology

But at the same time, a large amount of sludge will be produced, and the generated sludge has a high moisture content, which leads to high cost of subsequent sludge dehydration treatment, which greatly limits the application prospect of coagulation method

Images