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Advanced treatment method of urban reclaimed water for power plant

A technology for urban reclaimed water and advanced treatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as high salt content, high ammonia nitrogen content, and high organic matter content , to achieve good anti-corrosion performance and low phosphorus content

Inactive Publication Date: 2011-03-16
STATE GRID OF CHINA TECH COLLEGE
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AI Technical Summary

Problems solved by technology

However, the reclaimed water of urban sewage treatment plants has the characteristics of high salt content, high organic matter content, high ammonia nitrogen content, complex bacterial population, and high corrosion and scaling tendency, resulting in scaling, corrosion and microbial growth of heat exchangers and other components

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0016] 2 × 1000MW expansion unit supporting reclaimed water advanced treatment project, to carry out specific experiments. The reclaimed water is taken from the secondary discharge water of the urban sewage treatment plant.

[0017] One: the raw material that the present invention adopts:

[0018] Slaked lime: solid powder, purity ≥ 94%, fineness: 325 mesh;

[0019] Coagulant: polyferric sulfate (PFS): liquid, total iron content ≥ 10%, density: ≥ 1.45g / cm 3 ;

[0020] High-efficiency coagulant: 150-200 mesh attapulgite clay;

[0021] The water sample is the reclaimed water effluent of the sewage treatment plant during normal operation, the main water quality indicators are shown in Table 1, and the test water temperature is 26.3°C.

[0022] Table 1 The main water quality indicators of the test water samples

[0023] pH

7.09

Total P mg / L

1.99

Turbidity (NTU)

4.95

Full hardness mmol / L

8.60

Suspended matter mg / L

10.0

Ca hard ...

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Abstract

The invention relates to an urban reclaimed water treatment method, in particular to an advanced treatment method of urban reclaimed water used as cooling water for a power plant. The advanced treatment method of urban reclaimed water for the power plant of the invention comprises the following steps: carrying out aeration treatment and filtering; adding slaked lime, coagulant polyferric sulfate and efficient coagulant aid; adding bactericide for sterilizing; and adding composite scale and corrosion inhibitor, and after mixing the mixture evenly, adding the mixture to circulating water of the power plant. The advanced treatment method of the invention solves the related technical problems of advanced treatment, sterilization, scale inhibition, corrosion prevention, ammonia nitrogen treatment and the like of the reclaimed water involved by reclamation of the reclaimed water in the power plant, and provides technical support for safe and economical use of the reclaimed water in the power plant, and the reclaimed water is used as make-up water for the circulating water in the power plant, and has very obvious economical, social and environmental benefits.

Description

technical field [0001] The invention relates to a treatment method for urban reclaimed water, in particular to an advanced treatment method for urban reclaimed water used as cooling water for power plants. Background technique [0002] Cooling water consumes the most water in thermal power plants. Using urban reclaimed water as the supplementary water source for industrial circulation cooling is currently the first choice for countries around the world to solve the water shortage problem. The reuse of urban reclaimed water as circulating cooling water for thermal power plants can not only expand the scale of reclaimed water reuse, but also provide a long-term, stable and sufficient second water source for power plant cooling water. It has broad application prospects in alleviating the contradiction between supply and demand of water sources in power plants, reducing pollution, and reducing the amount of sewage discharged from cities to the environment. However, the reclaim...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 李艳萍李勇王彬沈竞为冯凤玲潘俊香
Owner STATE GRID OF CHINA TECH COLLEGE
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