Flue-gas biological desulphurization and organic wastewater combined treatment method

Abstract

The invention relates to a flue-gas biological desulphurization and organic wastewater combined treatment method. Biochemical pollutant in organic wastewater is used as a special nutrition source for high-efficiency alkaline-producing bacteria, sufficient alkalinity is generated, sulfur dioxide in flue gas is absorbed and neutralized, the absorbed SO2 is oxidized to form sulfate radical by the aid of a catalytic effect of microbial enzyme, and the flue gas is purified and meets the emission standard. Simultaneously, synchronous treatment of the wastewater is realized by the aid of biological desulphurization to a certain degree. Waste heat of the flue gas is absorbed by the wastewater, the temperature of water of a wastewater drainage desulphurization unit can reach 30 DEG C at least, the problem of difficulty in biochemical treatment due to over low temperature of wastewater in winter is solved, the waste heat of the flue gas and the biochemical pollutant in the waste water can be utilized to the greatest extent, and elemental sulfur can be obtained from the sulfate radical by the aid of a reducing bacterial and biochemical oxidization effect in follow-up wastewater biochemical treatment.

Description

technical field [0001] The invention relates to a treatment method of flue gas biological desulfurization and organic waste water combined process, especially a treatment method of coal-fired boiler desulfurization and organic waste water treatment with good biodegradability. Background technique [0002] In areas with low winter temperatures, wastewater biochemical treatment will be affected by low water temperature. The lower water temperature must prolong the hydraulic retention time (HRT) of the wastewater in the treatment process, that is, the volume of the treatment facility needs to be increased. This measure will inevitably lead to a substantial increase in the investment cost of wastewater treatment and increase the area occupied. Using waste heat to raise the temperature of wastewater is an ideal solution. Waste heat can be used for dedusting and desulfurization of flue gas from coal-fired boilers, but traditional wastewater treatment and desulfurization are two ...

AI Technical Summary

Problems solved by technology

[0005] 1. Wet flue gas desulfurization is to convert SO 2 Transferred to solid-phase calcium sulfate, and the utilization value of calcium sulfate is not high, causing difficulties in reuse or disposal;

[0006] 2. The most serious problem of wet desulfurization using limestone as desulfurizer is the scaling and blockage of gypsum, which is the main reason for the shutdown of the desulfurization absorber;

[0007] 3. Scaling and deposition in the desulfurization system will cause pipeline blockage, wear, corrosion and increase in system resistance, increasing investment and operating costs;

[0008] 4. Factors affecting the reliability of the FGD system mainly include flue gas conditions, absorbent characteristics, boiler operating conditions and other factors, as well as the operator's level of understanding and mastery of FGD operations. Due to the complicated process of wet flue gas desulfurization technology, Requires high maintenance costs