Desulfurization wastewater reverse osmosis reconcentration device

Abstract

The invention relates to an industrial wastewater treatment technology and device, and in particular, relates to a desulfurization wastewater reverse osmosis reconcentration device; an inlet of a precipitation pool communicates with an outlet of an oxidation pool and an inlet of a multi-medium filter; an outlet of the multi-medium filter communicates with an inlet of an electrodialysis device; a concentrated water outlet of the electrodialysis device communicates with an inlet of the oxidation pool; a fresh water outlet of the electrodialysis device communicates with an inlet of a reverse osmosis device; a fresh water outlet of the reverse osmosis device communicates with the inlet of the precipitation pool and the inlet of the oxidation pool; a concentrated water outlet of the reverse osmosis device communicates with an inlet of an evaporation crystallizer; an outlet of a first drug feeding box communicates with the inlet of the oxidation pool; an outlet of a second drug feeding box communicates with an inlet of the precipitation pool. Salts and other components in desulfurization waste water of a thermal power plant can be effectively removed, and the components can also be recycled in a useful form.

Description

technical field [0001] The invention relates to an industrial wastewater treatment process and device, in particular to a desulfurization wastewater reverse osmosis reconcentration device. Background technique [0002] At present, the common desulfurization wastewater treatment processes in thermal power plants at home and abroad are mainly: hydraulic ash removal, separate chemical treatment systems (mainly triple box treatment), evaporation and other methods. Among them, the evaporation treatment is to separate the desulfurization wastewater into high-quality water vapor and solid waste through evaporation and crystallization devices, so as to realize zero discharge of wastewater in the whole plant. The disadvantages of using the evaporation and crystallization method to treat desulfurization wastewater are: the investment is high, and the operation cost is high because all the desulfurization wastewater is evaporated. Therefore, it is necessary to reduce the amount of des...

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Problems solved by technology

The disadvantages of using evaporation and crystallization to treat desulfurization wastewater are: high investment, because all desulfurization wastewater is evaporated, and the operating cost is very high

Due to the high salt content of desulfurization wastewater and rich in organic matter and scaling substances, reverse osmosis is used to concentrate and reduce the amount, the pretreatment process requires strict requirements, and the recovery rate of the system is controlled at a low level, generally around 50%. The salinity of the brine increases to about 70000ppm, disposing of such brine will be a huge cost and challenge for the desalination industry, resulting in longer start-up preparation time and higher water cost

Nanofiltration is used to reduce the amount of desulfurization wastewater. The removal rate of nanofiltration for monovalent ions is too high, and the produced water cannot be directly reused. Further desalination of nanofiltration produced water is required to meet the reuse requirements. The process is relatively long and the treatment cost higher

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