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Treatment device and method capable of achieving waste water zero discharge of power plant with large water volume

A technology for power plant waste water and treatment methods, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of high investment and operating costs, no economic feasibility, water quality requirements It is not a very high problem, and achieves the effect of reducing investment costs and operating costs, achieving technical feasibility and economic feasibility, and reducing power plant water intake

Inactive Publication Date: 2016-01-20
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these methods are all wastewater advanced treatment technologies. The recovered water has basically reached the level of desalinated water, or the wastewater has not been reused (flue evaporation). The investment and operation costs are very high, and they are only suitable for 20 to 50 m 3 / h Zero discharge of waste water with small water volume
When the amount of wastewater is too large (≥500m 3 / h), the above method is not economically feasible
Moreover, the introduction of waste water into the flue will cause corrosion and scaling of the flue
Furthermore, the desalinated water required by the power plant is very small, and the main water used is circulating cooling water, industrial water, etc., and the water quality requirements are not very high, and there is no need to reach the desalinated water level. The current zero-discharge treatment and recovery method is suitable for replenishing this part of water not suitable for

Method used

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  • Treatment device and method capable of achieving waste water zero discharge of power plant with large water volume

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the zero-discharge treatment device for large-volume power plant wastewater includes a regulating pool 1, a lift pump 2, a mechanically accelerated clarifier 3, a dosing device 4, a clear water pool 5, a delivery pump 6, a filtering device 7, an ultrafiltration feed Water pump 8, submerged ultrafiltration device 9, ultrafiltration product water pump 10, product water distribution tank 11, first water distribution device 12, second water distribution device 13, clear water mixing tank 14, TDS online monitoring device 15, booster pump 16. Multi-stage reverse osmosis device 17, crystallization device 18, delivery pump 19.

[0048] The adjustment pool 1 communicates with the mechanical acceleration clarification tank 3 through the lifting pump 2, the mechanical acceleration clarification tank 3 is also connected with the dosing device 4 and the clean water tank 5, and the clean water tank 5 is also connected with the filter device 7 through the delivery p...

Embodiment 2

[0060] This embodiment is similar to Embodiment 1, the difference is that: in this embodiment, the specific implementation process of the zero-discharge treatment method for wastewater from large-volume power plants is as follows:

[0061] S1. Measure the content of active silicon in the waste water, introduce the waste water into the regulating pool, and fully mix it. The total amount of water inflow is 2000m 3 / h, TDS is 5000mg / L, and the hydraulic retention time of the adjustment pool is 4h.

[0062] S2. The uniformly mixed wastewater is introduced into the mechanically accelerated clarifier, and CaO and Na are added to the mechanically accelerated clarifier 2 CO 3 , MgO, AlCl 3 and PAM, controlling Ca 2+ with SO 4 2- The molar ratio is 3, Na 2 CO 3 The dosage of MgO is twice the molar amount of CaO added, and the molar ratio of MgO dosage to active silicon in water is 1.5; AlCl 3 The configuration weight percentage concentration of solution is 15%, AlCl 3 The dosa...

Embodiment 3

[0070] This embodiment is similar to Embodiment 1 and / or 2, the difference is that: in this embodiment, the specific implementation process of the zero discharge treatment method for large-volume power plant wastewater is as follows:

[0071] S1. Measure the content of active silicon in the waste water, introduce the waste water into the regulating pool, and fully mix it. The total amount of water inflow is 1500m 3 / h, TDS is 3000mg / L, and the hydraulic retention time of the adjustment pool is 1h.

[0072] S2. The uniformly mixed wastewater is introduced into the mechanically accelerated clarifier, and CaO and Na are added to the mechanically accelerated clarifier 2 CO 3 , MgO, AlCl 3 and PAM, controlling Ca 2+ with SO 4 2- The molar ratio is 1.5, Na 2 CO 3 The dosage of MgO is 1.5 times of the molar amount of CaO added, and the molar ratio of MgO dosage to active silicon in water is 1.3; AlCl 3 The configuration weight percentage concentration of solution is 5%, AlCl ...

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Abstract

The invention relates to a treatment device and method capable of achieving waste water zero discharge of a power plant with large water volume. By means of the treatment device and method, the technical feasibility and the economic feasibility of large water volume waste water zero discharge can be simultaneously met, and large water volume waste water zero discharge engineering application of the power plant is made to be possible. Meanwhile, reused water can be used as replenished water of water bodies such as recycling cooling water from the power plant and industrial water, the water taking amount of the power plant can be decreased, the applied water cost is reduced, discharge of water body pollutants is completely eradicated, and the ecological environment is protected to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment and reuse, in particular to a zero-discharge treatment device and method for wastewater from a large-volume power plant. Background technique [0002] Thermal power plants are large water users, and their water consumption accounts for more than 50% of the total industrial water use in the country. At the same time, their wastewater discharge is huge, mainly including circulating water sewage, desulfurization wastewater, and domestic wastewater. Rational use of water and optimal allocation of water resources are key factors affecting the development of thermal power enterprises. With the advancement of science and technology, industrial sewage is no longer waste water, but a precious water resource. The most effective way to solve the problem of water resources in power plants is to completely recycle the discharged waste water and achieve zero discharge of waste water. It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10
Inventor 韩飞超陈光衡世权时孝磊郭博闻刘朝辉陶志国刘伟伟喻江
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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