Desulfurization wastewater zero discharging process with carbon dioxide method

Abstract

The invention provides a desulfurization wastewater zero discharging process with a carbon dioxide method. The process comprises the following steps: collecting desulfurization wastewater; performing a pH primary reaction; adjusting the pH value to an alkaline condition by adding lime, so as to precipitate magnesium ions, fluoride ions, sulfate ions and heavy metal ions; finally, enabling chlorine ions and ammonia gas to react through an organic substance catalytic reaction, so as to obtain an ammonium chloride product. According to the process, the problem that the wastewater cannot be recycled as the desulfurization wastewater is high in the content of chlorine ions is solved.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a zero-discharge process for desulfurization wastewater using a carbon dioxide method. Background technique [0002] At present, there are several methods for the zero discharge treatment technology of desulfurization wastewater: 1) pretreatment softening: currently using double alkali method, etc., the problem is that the hardness of desulfurization wastewater is extremely high (greater than 10000 mg per liter); 2) membrane concentration reduction: due to No matter what kind of membrane is used, the principle of molecular sieve is adopted. Based on this principle, the life of the membrane will not be too long under this high pollution condition. At present, this kind of membrane material cannot be well localized, and the price is relatively expensive. It will consume a large amount of unnecessary foreign exchange reserves of our country. In terms of users, the wearing parts (me...

AI Technical Summary

Problems solved by technology

In terms of users, the wearing parts (membranes) are frequently replaced, and the average operation cost per ton of water is too high; 3) Evaporation method MVR method: the investment is too large, the general failure rate is high, and the operation cost is high due to the large amount of power consumption. Hazardous solid waste impurity salts cannot be disposed of or the cost of disposal is extremely high

4) Direct flue spraying method: damage the dust removal equipment, affect the dust removal effect and produce dangerous solid waste impurity salt that cannot be disposed of or the disposal cost is extremely high

5) High-temperature flue gas spray drying method: It is greatly affected by restrictive factors such as flue gas volume flue gas temperature fluctuations, and at the same time produces dangerous solid waste impurities and salts that cannot be disposed of or the disposal cost is extremely high

Images