Method for treating chromium-containing rinsed wastewater
A technology for wastewater treatment and wastewater, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of difficult reuse after treatment, high treatment cost, and high conductivity. , to achieve the effect of saving disposal costs, economical and environmental protection, and improving sedimentation speed
Inactive Publication Date: 2018-01-30
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
There are two main problems in this kind of chemical reduction precipitation process including the above-mentioned treatment method: one is to produce a large amount of chromium-containing sludge, which is a hazardous waste, and it is necessary to seek a qualified treatment unit, and the treatment cost is relatively high Another problem is that a large amount of reducing agent (sodium bisulfite) and neutralizing agent (lime) are added during the treatment process, resulting in high conductivity and high hardness in the effluent water, which is difficult to reuse after further treatment. Discharge after mixing with acid wastewater
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[0022] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0023] As shown in FIG. 1 , it is a flow chart of the recovery process of chromium-containing flushing wastewater according to the present invention. The chromium-containing flushing wastewater first enters the pretreatment system for filtration to filter out particles above 5 μm. Filters with fillers such as quartz sand and anthracite can be used for filtration, and inorganic ceramic membranes or sintered organic membranes can also be used for filtration.
[0024] First, the filtered pickling wastewater is heated to 50-100°C with low-temperature steam on site, enters the water storage tank, and is lifted to the membrane module (ie, the high-efficiency membrane concentration system in the figure) by a circulating pump, and the water vapor on the wastewater side containing chromium is washed After passing through the membrane, it...
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Abstract
The invention discloses a method for treating chromium-containing rinsed wastewater. The method for treating chromium-containing rinsed wastewater comprises the steps of: 1, filtering out particles with the particle size of 5 um or above in the chromium-containing rinsed wastewater; 2, adopting a permeable membrane to perform concentration on the rinsed wastewater which is obtained in the step 1;3, adopting acid to adjust the pH value of a concentrated solution, which is obtained in the step 2, to 1-3, adding a reducing agent into the pH-adjusted concentrated solution so as to reduce hexavalent chromium ions in the pH-adjusted concentrated solution to trivalent chromium ions, and then adjusting the pH value to 7-9 of the obtained concentrated solution by using alkali so as to perform further precipitation; 4, using precipitate which is obtained in the step 3 as a raw material for a stainless steel sintering procedure in stainless steel smelting. After the chromium-containing rinsed wastewater is treated by using the method, 90-99% or above of pure water in the chromium-containing rinsed wastewater is recovered and then returned to the production process for use, meanwhile, the chromium-containing wastewater which contains pure water of 90-99% or above is discharged, and therefore the method has good social and environmental benefits.
Description
technical field [0001] The invention relates to a wastewater treatment technology, in particular to a method for treating chromium-containing flushing wastewater. Background technique [0002] Chromium and its compounds are widely used in industry. A series of industries such as metallurgy, chemical industry, mineral engineering, electroplating, chromium production, pigments, pharmaceuticals, light industry textiles, chromium salts and chromium compound production will produce a large amount of chromium-containing wastewater. Among them, the compounds of chromium are mainly trivalent (such as Cr 2 o 3 ) and hexavalent (such as CrO 4 2- or Cr 2 o 7 2- ) in the form of chromium, while hexavalent chromium is the most toxic, about a hundred times that of trivalent chromium. [0003] In the cold rolling industry, after the chromium-containing passivation process of cold rolling, the surface of the strip steel needs to be washed with pure water. The wastewater after washing...
Claims
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IPC IPC(8): C02F9/04C02F101/22
Inventor 侯红娟武晟尹婷婷殷玫婕丁宗琪施瑞康吴昊李恩超王如意
Owner BAOSHAN IRON & STEEL CO LTD