Swirl flocculation device and coal-fired power plant high-salt and high-turbidity waste water treatment system and application thereof

Abstract

The invention provides a swirl flocculation device and a coal-fired power plant high-salt and high-turbidity waste water treatment system and application thereof. The device comprises a box body (1),a swirl coagulation tube (2) and an inner tube (3) are arranged in the middle of the inside of the box body, the swirl coagulation tube is arranged at the bottom of the box body and located in the inner tube, and the swirl coagulation tube extends upwards to reach the top edge of the box body and is not in contact with the top of the box body; the inner tube is arranged at the top of the box bodyand extends downward, and the bottom edge of the inner tube is not in contact with the box body; swirl guiding plates (4) are arranged on the outer wall of the part, extending into the inner tube, ofthe swirl coagulation tube, and the swirl blades (5) are arranged in the swirl coagulation tube; a water inlet pipe (6) is arranged outwards at the bottom of the box body, and the water inlet pipe iscommunicated with the swirl coagulation tube; an overflow groove (8) is formed in the edge of the top of the box body. The system comprises a water softener plant (101), the swirl flocculation device(102), a filter (103), a preconcentrator (104), a preheater (105), a membrane distiller (106) and an evaporation tower (107) which are sequentially connected through pipelines.

Description

technical field

[0001] The invention relates to the field of waste water treatment in power plants. Specifically, the invention relates to a swirling flow flocculation device, a high-salt and high-turbidity waste water treatment system and application of a coal-fired power plant. Background technique

[0002] With the promulgation of a series of wastewater discharge management policies such as the Water Ten Articles, technologies related to zero discharge of wastewater from coal-fired power plants have received more and more attention and attention. Zero discharge of wastewater from coal-fired power plants is an inevitable trend. Under the current conditions, it is still difficult to achieve near-zero discharge of some high-salt wastewater in coal-fired power plants. The most difficult to treat is the desulfurization wastewater generated during the limestone-gypsum wet desulfurization process. Desulfurization wastewater not only contains a large amount of solids, but also co...

Examples

Embodiment 1

[0050] use as figure 2 The waste water treatment system shown, waste water (pre-treatment indicators are shown in Table 1) treatment process: (1) softened by adding soda to the softened water device, and then enter the cyclone flocculation device (such as figure 1 As shown), adding polyferric chloride coagulant and polyacrylamide flocculant in turn, the SS content in the outlet wastewater of the cyclone flocculator will be reduced to 12mg / L, the copper ion content will be 5mg / L, and other components will remain basically unchanged; ( 2) The filtration process adopts a multi-media filter. At this time, the content of suspended solids is less than 3mg / L, calcium ions (Ca 2+ )657mg / L, magnesium ion (Mg 2+ ) 366mg / L; (3) Two-stage reverse osmosis treatment is used for pre-shrinking, the wastewater TDS is concentrated from 25000mg / L to about 60000mg / L, fresh water is reused, and concentrated brine enters the membrane distillation treatment unit; (4) The membrane distillation proc...

technical field

[0001] The invention relates to the field of waste water treatment in power plants. Specifically, the invention relates to a swirling flow flocculation device, a high-salt and high-turbidity waste water treatment system and application of a coal-fired power plant. Background technique

[0002] With the promulgation of a series of wastewater discharge management policies such as the Water Ten Articles, technologies related to zero discharge of wastewater from coal-fired power plants have received more and more attention and attention. Zero discharge of wastewater from coal-fired power plants is an inevitable trend. Under the current conditions, it is still difficult to achieve near-zero discharge of some high-salt wastewater in coal-fired power plants. The most difficult to treat is the desulfurization wastewater generated during the limestone-gypsum wet desulfurization process. Desulfurization wastewater not only contains a large amount of solids, but also co...

Examples

Embodiment 1

[0050] use as figure 2 The waste water treatment system shown, waste water (pre-treatment indicators are shown in Table 1) treatment process: (1) softened by adding soda to the softened water device, and then enter the cyclone flocculation device (such as figure 1 As shown), adding polyferric chloride coagulant and polyacrylamide flocculant in turn, the SS content in the outlet wastewater of the cyclone flocculator will be reduced to 12mg / L, the copper ion content will be 5mg / L, and other components will remain basically unchanged; ( 2) The filtration process adopts a multi-media filter. At this time, the content of suspended solids is less than 3mg / L, calcium ions (Ca 2+ )657mg / L, magnesium ion (Mg 2+ ) 366mg / L; (3) Two-stage reverse osmosis treatment is used for pre-shrinking, the wastewater TDS is concentrated from 25000mg / L to about 60000mg / L, fresh water is reused, and concentrated brine enters the membrane distillation treatment unit; (4) The membrane distillation proc...

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