Novel wet-process flue gas desulfurization wastewater treatment system

Abstract

The invention relates to a novel wet-process flue gas desulfurization wastewater treatment system which comprises a high-efficiency precipitator (2) and is characterized in that the high-efficiency precipitator (2) is communicated with a desulfurization wastewater source, the outlet of the high-efficiency precipitator (2) is communicated with a high-efficiency precipitator sludge discharge pump (25) and a PH adjusting tank (3) through pipelines; the PH adjusting tank (3) is communicated with a softening reaction tank (7); the softening reaction tank (7) is communicated with a settling tank (11); the settling tank (11) is communicated with a tubular micro-filtration membrane (15); the tubular micro-filtration membrane (15) is communicated with a backwashing water column (16); the backwashing water column (16) is connected with a clean water tank (20); a membrane cleaning acid liquid metering tank (31) and a membrane cleaning alkaline liquid metering tank (32) are respectively communicated with a clean water pump (33); a sludge concentrator (23) is communicated with a membrane concentrate discharge electric valve (22), a box type filter press filtrate discharge electric valve (29) and an outlet of a settling tank sludge discharge pump (24) through the pipeline. The novel wet-process flue gas desulfurization wastewater treatment system provided by the invention has the characteristics of being novel in process, compact in structure, stable in running, and low in investment and running expense.

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.

Images