Chromium ion-containing wastewater treatment system

Abstract

The invention belongs to the field of water treatment and environmental protection, and particularly relates to a chromium ion-containing wastewater treatment system. The chromium ion-containing wastewater treatment system comprises a sewage tank, an aeration tank and a secondary sedimentation tank which are sequentially connected through a through pipe, wherein the aeration tank comprises an airinjection module and a floating plate, the air injection module comprises a main air inlet pipe, a plurality of groups of air injection branch pipes and an air compressor, a plurality of aeration holes are correspondingly formed in the multiple groups of air injection branch pipes, and the aeration holes face upwards; the floating plate is arranged in the aeration tank and comprises a foam pumpingunit and a packing unit; the foam pumping unit is arranged on the upper surface of the floating plate; and the packing unit is arranged on the lower side of the floating plate. When the packing unitis closed, the foam can be gathered below the floating plate, the floating plate is temporarily separated from the sewage, and the foam pumping unit pumps and collects the foam at the moment, so thatthe purpose of removing the foam on the surface of the sewage is achieved, and the influence of the foam in the secondary sedimentation tank on the sewage is eliminated.

Description

technical field [0001] The invention belongs to the field of water treatment and environmental protection, in particular a chromium ion-containing wastewater treatment system. Background technique [0002] With the development of modern industry and the intensification of human activities, the pollutants produced far exceed the self-purification function of the environment, and the environmental pollution is becoming more and more serious. Human beings try to eliminate these pollutions through artificial environments, and strengthen the prevention and control of water pollution. Heavy metals mainly refer to mercury (Hg), cadmium (Cd), lead (Pb), chromium (cr), arsenic (As), copper (Cu), zinc (Zn), cobalt (Co), nickel (Ni), etc. heavy metal. They exist in the environment in different forms, and migrate and accumulate in the environment. Mining, metallurgy, chemical industry and other industries are the main sources of man-made pollution in water bodies. The excessive accum...

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Problems solved by technology

[0003] But in the current situation, the easy sewage in the aeration tank tends to generate a lot of foam. If it is not cleaned, the foam will cover a large amount of sewage surface in the aeration tank, and enter the secondary sedimentation tank from the aeration tank along the connecting holes , foam has adverse effects on sewage treatment operation and effluent water quality

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