Chromium-containing wastewater treatment and recovery process and equipment
A technology for recycling equipment and chromium wastewater, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc., and can solve the problems of large investment in ion exchange technology equipment, high operating cost, and complicated operation. , to achieve the effect of preventing scaling and fouling, saving land resources, and reducing the volume of equipment
Active Publication Date: 2015-10-28
SHANGHAI LIGHT IND RES INST
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Problems solved by technology
However, due to the disadvantages of large equipment investment, high operating cost and complicated operation, ion exchange technology has been rarely used.
Evaporation and concentration also faded out of the market due to shortcomings such as high energy consumption
Method used
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[0044] According to an embodiment of the present invention, the chromium-containing wastewater treatment and recovery equipment includes two parts: reduction treatment of hexavalent chromium wastewater and wastewater reverse osmosis desalination recovery. The pipeline reactor is used in the reduction treatment of hexavalent chromium wastewater. The pipeline reactor is based on the idea that after injecting the reagent into the wastewater, it passes through the reactor at a certain flow rate for rapid mixing and reaction, and then flows out of the reactor. This method avoids the use of a large-capacity reaction vessel, so the equipment occupies a small space and can quickly realize the reduction of hexavalent chromium.
[0045] After hexavalent chromium is reduced, the reverse osmosis desalination recovery part of the wastewater is desalinated using reverse osmosis recycling technology. Although there are attempts to recover hexavalent chromium-containing wastewater by using reve...
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Abstract
The invention relates to a technology and equipment for treating and recovering chromium-containing waste water, which can be especially used for treating and recovering hexavalent-chromium-containing waste water. The technology is characterized by comprising the following steps: waste water and an acidic reagent flow through a first pipeline mixer at a certain flow velocity so as to be mixed and reacted, and then flow through a first equalizer and stay for a short time, wherein the pH value in the first equalizer is controlled within an acidic pH value range; similarly, the waste water and a reducing agent containing excessive sodium metabisulfite flow through a second pipeline mixer at a certain flow velocity so as to be mixed and reacted, and then flow through a second equalizer and stay for a short time, wherein the oxidation reduction potential (ORP) value in the second equalizer is controlled within a target ORP range; the waste water flowing out of the second equalizer flows into a reverse osmosis machine set so as to be subjected to reverse osmosis desalination. The waste water in the reverse osmosis machine set is acidic and contains sodium metabisulfite which is not used completely, so that a reverse osmosis membrane is prevented from being oxidized and damaged, and scaling and pollutant blockage caused by metal precipitates are avoided.
Description
technical field [0001] The invention belongs to the field of surface treatment wastewater treatment, and in particular relates to the treatment and recovery technology of chromium-containing wastewater. Background technique [0002] The chromium plating and passivation production process in the surface treatment industry will produce a large amount of chromium-containing wastewater, and the chromium content exceeds the national standard by hundreds of times. Due to the increasingly serious environmental pollution and resource shortage of chromium, people pay more and more attention to the pollution control and resource utilization of chromium wastewater. [0003] In surface treatment wastewater, chromium is mainly in the hexavalent form (such as CrO 4 2- 、Cr 2 o 7 2- ) exists, and hexavalent chromium is a very toxic and strong oxidant. At present, most enterprises use chemical reduction method to reduce hexavalent chromium to trivalent chromium, and then adjust the pH ...
Claims
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IPC IPC(8): C02F9/04G05D21/00C02F101/22
CPCY02A20/131
Inventor 王英华王维平
Owner SHANGHAI LIGHT IND RES INST