Immersion cleaning system and method for treating construction waste with citric acid

Abstract

The invention discloses an immersion cleaning system and method for treating construction waste with citric acid. The system comprises an agent stirring tank, an agent distributing pond, an agent distributing pipeline, a flushing pipe network, a water collecting pond, a sewage treatment device, two reaction ponds parallelly arranged in a space way and a downflow weir arranged between the two reaction ponds. The downflow weir comprises a plugged end and a water outlet end. The upper portion of the downflow weir is provided with the agent distributing pipeline. The agent distributing pond is arranged on the side, close to the downflow weir, of the plugged end, and the water collecting pond is arranged on the side, close to the downflow weir, of the water outlet end. The agent stirring tank comprises an agent liquid storage area and an agent liquid stirring tank arranged at the central position of the agent liquid storage area, and prepared citric acid treating liquid is introduced to anagent inlet of the agent distributing pond through a liquid outlet of the agent liquid stirring tank and an agent inlet pipeline. After high-concentration construction waste is treated, it is can be ensured that the hexavalent chromium leaching concentration is controlled to 0.5 mg / l or below, and the problem of full dissolution of hexavalent chromium in construction waste is efficiently solved.

Description

technical field [0001] The invention relates to the technical field of construction waste treatment, in particular to a soaking system and method for treating construction waste with citric acid. Background technique [0002] During the relocation of chromium salt factories and downstream enterprises such as electroplating and leather tanning along with industrial upgrading, buildings and structures contaminated by chromium in the original factory area (such as production workshops, sewage treatment plants, etc.) were demolished in situ, forming tens of thousands of square meters Chromium-contaminated construction waste, its hexavalent chromium concentration and hexavalent chromium leaching concentration are much higher than the limit value of general industrial solid waste entering the landfill, and must be treated before it can be safely landfilled. New requirements have been put forward for the technical methods and processing equipment and facilities of garbage disposal....

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a citric acid immersion system and method for treating construction waste, to solve the problem of cumbersome treatment procedures for high-concentration polluted construction waste with an initial content of hexavalent chromium above 500 mg / kg, high pre-treatment requirements, and post-treatment repair Technical problems such as poor effect, substandard repaired site, and long processing period

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