Membrane-softening treatment system and method used for supplement water for circulating water of reclaimed water source

Abstract

The invention discloses a membrane-softening treatment system and method used for supplement water for circulating water of a reclaimed water source. The system comprises a raw water tank, an ultrafiltration device, an intermediate water tank, a nanofiltration device, a clear water tank, a circulating cooling tower, a desulphurization absorbing tower and a scale inhibitor adding system, wherein a water outlet of the raw water tank is communicated with a water inlet of the ultrafiltration device, a water outlet of the ultrafiltration device is connected with a water inlet of the intermediate water tank, a water outlet of the intermediate water tank is merged with a water outlet of the scale inhibitor adding system through a pipeline, then the merged water outlet is communicated with a water inlet of the nanofiltration device, a produced water outlet of the nanofiltration device is communicated with a water inlet of the clear water tank, a water outlet of the clear water tank is communicated with a water inlet of the circulating cooling tower, and a sewage discharge outlet of the circulating cooling tower and a concentrated water of the nanofiltration device are both communicated with a water inlet of the desulphurization absorbing tower. The membrane-softening treatment system and method provided by the invention can effectively improve the concentration ratio of the circulating water and has the advantages of low cost, a small occupied area and good effluent quality.

Description

technical field [0001] The invention belongs to the technical field of sewage reuse, and relates to a softening treatment system and method for reclaimed water source with circulating water replenishment water film method. Background technique [0002] Thermal power plants are large industrial water users, and the open circulation cooling system accounts for 60% to 80% of the total water consumption of the whole plant. In the case of increasing shortage of water resources, most thermal power plants have strictly prohibited the use of groundwater and restricted the use of surface water. In response to national energy conservation and environmental protection policies and local environmental protection requirements, many power plants have begun to use urban reclaimed water, especially as supplementary water for circulating water with the highest proportion of production water. [0003] The total dissolved solids content of reclaimed water is usually higher than that of fresh ...

AI Technical Summary

Problems solved by technology

However, lime treatment is suitable for water with a high temporary hardness ratio, otherwise the residual hardness of the effluent is still high, which limits the increase in the concentration ratio of circulating water; the lime dosing and metering system is prone to failure, which affects the effluent water quality; the amount of sludge formed is large , it is necessary to set up a sludge treatment system, and the mud cake after pressure filtration becomes solid waste and needs to be disposed of separately; adding a variety of chemical agents will increase the operating cost; to ensure the lime-coagulation clarification effect, a larger pool body needs to be set up Guaranteed sufficient residence time, large footprint

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