Desulfurization wastewater primary settling tank

Abstract

At present, the design capacity of the waste water cyclone and the size of the cyclone nozzle in the desulfurization system are not properly selected, the cyclone effect of the waste water is poor, and the solid content of the incoming water of the desulfurization waste water is high, thus causing the problem of deposition blockage of connecting pipelines between system equipment. The invention discloses a desulfurization wastewater primary sedimentation tank, which is divided into four zones, namely a sludge zone, a sedimentation zone, a clean water zone and a sludge stacking zone, and has arectangular shape, an open top and an internal inclination of 10-20% towards the incoming water direction, so that sludge is precipitated, and the total volume of the sludge can enable the incoming water to stay for 10-50 hours. There is no obvious dividing line between the sludge area and the sedimentation area, and they are naturally separated in the tank according to gravity. The incoming wateris provided with an automatic door, which is naturally separated and clarified after settling in the settling area, and is respectively opened according to the height of the liquid level meter. The sludge stacking area is located on the ground and slopes to the sludge area. A filter screen is arranged at the joint of the sludge area and the sludge stacking area. When the sludge stacking area is located, water flows to the sludge area through the filter screen. The turbidity of the effluent from the clean water zone is less than 1000 NTU, reducing the back-end treatment load.

Description

technical field [0001] The invention relates to the technical field of zero discharge of waste water in a thermal power plant, in particular to a primary sedimentation tank for desulfurization waste water. Background technique [0002] In the current desulfurization wastewater treatment, there are certain problems in the current front-end design. 1) The design capacity of the desulfurization system wastewater cyclone and the size of the swirl sub-nozzle are not properly selected, the wastewater swirl effect is poor, and the solid content of the desulfurization wastewater incoming water is high, resulting in The problem of sedimentation and clogging of connecting pipes between system equipment, such as the connecting pipes between neutralization tanks, settling tanks, and flocculation tanks, is often blocked due to the deposition of suspended solids, and it is difficult to clean. 2) The desulfurization wastewater treatment system is not designed with a wastewater buffer pool....

AI Technical Summary

Problems solved by technology

[0002] In the current desulfurization wastewater treatment, there are certain problems in the current front-end design. 1) The design capacity of the desulfurization system wastewater cyclone and the size of the swirl sub-nozzle are not properly selected, the wastewater swirl effect is poor, and the solid content of the desulfurization wastewater incoming water is high, resulting in The problem of sedimentation and clogging of connecting pipes between system equipment, such as the connecting pipes between neutralization tanks, settling tanks, and flocculation tanks, is often blocked due to the deposition of suspended solids, and it is difficult to clean

2) No wastewater buffer pool is designed for the desulfurization wastewater treatment system

The discharge of desulfurization wastewater is characterized by discontinuity and large flow changes. The wastewater has not been buffered and adjusted by homogeneity and volume, which may easily cause the short-term overload of the desulfurization wastewater treatment system, especially the clarifier, and affect the quality of the effluent.

3) Due to the high solid content of wastewater, fouling of the system pipeline occurs

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