Method and device for recycling high-magnesium wastewater from power plants

A magnesium power plant, resource utilization technology, applied in the field of resource utilization of waste water from high-magnesium power plants, can solve the problems of unutilized magnesium resources and high dosing costs, and achieve the effects of reduced dosing costs, reduced energy consumption, and high-efficiency separation

Pending Publication Date: 2019-03-26
国能朗新明环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the high cost of dosing for pretreatment of high-magnesium wastewater and the inability to utilize magnesium resources, the purpose of the present invention is to provide a m

Method used

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  • Method and device for recycling high-magnesium wastewater from power plants
  • Method and device for recycling high-magnesium wastewater from power plants

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The composition of high-magnesium wastewater from a certain power plant is shown in Table 1. It is the wastewater after preliminary coagulation and sedimentation treatment. The coagulation and sedimentation process is a conventional process in this field, and will not be repeated here. where Ca 2+ The concentration is 580mg / L, Mg 2+ The concentration is 4650 mg / L, SO 4 2- : Mg 2+ The molar ratio is 0.73:1.

[0043] Table 1 Water quality characteristics of high magnesium wastewater from a power plant

[0044] project

quantity

Ca 2+ (mg / L)

580

Mg 2+ (mg / L)

4650

Cl - (mg / L)

6731

SO 4 2- (mg / L)

13580

[0045] as attached figure 1 As shown, the steps of resource utilization of waste water from this high-magnesium power plant are:

[0046] (1) Softening and decalcification: add oxalic acid to the wastewater, the amount of oxalic acid added is 1.56kg / m 3 , so that the molar ratio of oxalate ions to...

Embodiment 2

[0058] The composition of high-magnesium wastewater from a certain power plant is shown in Table 2. It is the wastewater after preliminary coagulation and sedimentation treatment. The coagulation and sedimentation process is a conventional process in the field, and will not be repeated here. where Ca 2+ The concentration is 880mg / L, Mg 2+ The concentration is 10980mg / L, SO 4 2- : Mg 2+ The molar ratio is 0.47:1.

[0059] Table 2 Water quality characteristics of high magnesium wastewater from a power plant

[0060] project

quantity

Ca 2+ (mg / L)

880

Mg 2+ (mg / L)

10980

Cl - (mg / L)

18731

SO 4 2- (mg / L)

20580

[0061] as attached figure 1 As shown, the steps of resource utilization of waste water from the high-magnesium and low-calcium power plant are:

[0062] (1) Softening and decalcification: adding sodium oxalate to the wastewater, the amount of sodium oxalate added is 4.23kg / m 3 At this time, the pH...

Embodiment 3

[0071] A high-magnesium power plant wastewater resource utilization device includes a softening pretreatment system, a tubular membrane ultrafiltration system, a component adjustment system, a nanofiltration salt separation system, a reverse osmosis concentration system, and an evaporation crystallization system connected in sequence.

[0072] Such as figure 2 As shown, the softening pretreatment system includes a reaction tank 1 and a first buffer tank 2, wherein an automatic dosing unit is provided above the reaction tank 1, and the automatic dosing unit includes a decalcifier adder and a Ph regulator adder for adding Calcium remover and pH regulator are added in the reaction tank 1. The reaction pool 1 is provided with a first agitator, and the water in the reaction pool 1 enters the first buffer pool 2 through the overflow port, and the water in the first buffer pool 2 enters the tubular membrane ultrafiltration system through a pump.

[0073] The tubular membrane ultraf...

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Abstract

The invention discloses a method and a device for recycling high-magnesium wastewater from power plants and belongs to the technical field of water treatment. The method for recycling high-magnesium wastewater from power plants comprises the following steps: softening and removing calcium; adjusting compositions; nano-filtering and separating salt; concentrating and crystallizing. The device for recycling high-magnesium wastewater from power plants comprises a softening pretreatment system, a composition adjusting system, a nano-filtering and salt-separating system, a reverse osmosis concentration system and an evaporative crystallization system which are connected with each other in turn along a flowing direction of wastewater. According to the method for recycling high-magnesium wastewater from power plants disclosed by the invention, calcium ions in water can be effectively removed, magnesium ions can be fully utilized and dosing cost of pretreatment can be greatly lowered. Sodium chloride products and magnesium sulfate products acquired by utilizing the method and device provided by the invention are high in purity and high in recovery rate.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and device for resource utilization of high-magnesium power plant wastewater. Background technique [0002] With the release of the national "Water Pollution Prevention and Control Plan", higher requirements have been put forward for the water and drainage of thermal power plants. The construction of zero discharge system for thermal power plant wastewater has become the development trend of power plant wastewater treatment. Among the various wastewater discharged from power plants, the high-salt wastewater and desulfurization wastewater produced by the ion exchange regeneration system are the most difficult to treat. This type of wastewater has high hardness, high suspended solids, high salt content, strong corrosion, and large fluctuations in water quality and quantity. . [0003] At present, the mainstream technologies for zero discharge of power ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01F5/40C01D3/14C01D3/04
CPCC01D3/04C01D3/14C01F5/40C02F1/001C02F1/048C02F1/44C02F1/441C02F1/442C02F1/444C02F1/58C02F1/66C02F5/02C02F9/00
Inventor 苏双青赵焰孙斌徐志清李向南陈雪陆梦楠陈文婷腾东玉
Owner 国能朗新明环保科技有限公司
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