Wet flue gas desulfurization wastewater treatment system

Abstract

A wet flue gas desulfurization wastewater treatment system, which includes a high-efficiency precipitator (2), characterized in that the high-efficiency precipitator (2) is connected to the desulfurization wastewater water source, and its outlet is discharged from the high-efficiency precipitator through a pipeline The pump (25) and the pH adjustment tank (3) are connected, the pH adjustment tank (3) is connected to the softening reaction tank (7), the softening reaction tank (7) is connected to the settling tank (11), and the settling tank (11) It is connected with the tubular microfiltration membrane (15), and the tubular microfiltration membrane (15) is connected with the backwash water column (16); the backwash water column (16) is connected with the clean water tank (20); the membrane cleaning acid solution metering box (31 ) and the membrane cleaning lye metering box (32) are respectively connected with the cleaning water pump (33); the sludge concentrator (23) is connected with the membrane concentrated liquid discharge electric valve (22) through the pipeline, and the van filter press filtrate discharge electric valve (29), the outlet of the settling tank mud discharge pump (24) is connected. The invention has the characteristics of novel process, compact structure, stable operation, low investment and operation cost.

Description

technical field [0001] The present invention relates to a wastewater treatment technology, especially a technology that includes neutralization reaction, softening reaction, sludge-water separation and membrane separation technology of desulfurization wastewater and can effectively remove heavy metal ions, calcium ions, magnesium ions and suspended matter in wastewater Multifunctional treatment technology, specifically a new type of wet flue gas desulfurization wastewater treatment system. Background technique [0002] At present, a certain amount of desulfurization wastewater will be produced in domestic wet flue gas desulfurization production. The pH value of desulfurization wastewater is 5.0~5.5. The main pollution factors of heavy metals in wastewater are mercury, cadmium, chromium, nickel, and the suspended solids in wastewater are as high as 15000~ 25000 mg / L, the calcium ion in the wastewater is 2000-6000 mg / L, the magnesium ion in the wastewater is 1500-4500 mg / L, an...

AI Technical Summary

Problems solved by technology

Under acidic conditions in desulfurization wastewater, toxic heavy metal ions are dissolved in the water. When lime milk or caustic soda is added to make the pH of the water around 9.5, the toxic heavy metal ions will form hydroxides and precipitate in the sludge, and the sludge formed by pressure filtration The cake is classified as hazardous waste, and the disposal cost is very high. According to the regional differences in the amount and quality of the treated water and the disposal cost, the annual disposal cost is generally 6 million to 12 million yuan. Due to the current treatment process is too long, there are many types of chemicals, and the dosage is large. High investment costs, large floor area, high operating costs, sludge disposal costs, and complicated operation and management have restricted the implementation of desulfurization wastewater treatment. Therefore, a new type of wet flue gas desulfurization wastewater treatment device is designed.

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