Complete equipment for treating chromium wastewater

Abstract

The invention provides complete equipment for treating chromium wastewater. The complete equipment comprises a reaction tank, a pressure filter, a mechanical filter and an activated carbon absorber, wherein the reaction tank is provided with a water level meter, a float switch, a pH sensor, a chemical inlet and stirring equipment, the mechanical filter is provided with a high-pressure gas inlet pipe and a gas outlet pipe, and the interior of the mechanical filter is divided into an upper coarse filtering layer and a lower refined filtering layer. The complete equipment has the advantages that the complete equipment is simple in structure, reasonable in design, capable of lowering equipment operation cost, increasing chromium wastewater treatment efficiency and effect and effectively controlling feeding quantity, visual in liquid level, fast in wastewater filtering and high in safety; filtered water is quite clean after being absorbed by activated carbon and can be directly used by other working procedures or used for cleaning, environment pollution is avoided, water resource utilization rate is increased, and waste is avoided.

Description

technical field [0001] The invention relates to chromium wastewater treatment, in particular to a complete set of chromium wastewater treatment equipment. Background technique [0002] At present, the chromium-containing wastewater mainly comes from the metal electroplating industry, and metal processing enterprises such as the steel manufacturing industry and the domestic metallurgical and chemical industries discharge about 200,000 to 300,000 tons of chromium slag every year. The harmful components in chromium slag are mainly hexavalent chromium ions such as soluble sodium chromate and acid-soluble calcium chromate. Because of these hexavalent chromium and its loss and diffusion, it constitutes a pollution hazard to the ecological environment. The second is the strong alkali hazard of chromium slag. When chromium slag is piled up in the open air, a large amount of hexavalent chromium ions dissolve, lose, and infiltrate into the surface with rainwater after long-term rain...

AI Technical Summary

Problems solved by technology

[0003] General chromium wastewater treatment equipment needs to carry out steps such as acidification, chromium breaking, reduction and separation of chromium wastewater. Acidification, as the first step, directly affects the integrity of subsequent reactions, which in turn affects the effect of chromium wastewater treatment. The acidification equipment currently used, It cannot effectively and automatically control the amount of liquid, and the injection of acid liquid cannot reach the level of automatic injection with pH changes, which has a direct impact on the treatment of chromium wastewater. Moreover, after separation by pressure filtration, the general enterprise directly discharges the waste liquid or roughs it. Discharge after filtration, not only pollute the environment, but also cause waste of water

Images