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Technique and equipment for treating waste liquor containing high concentration chromium by microorganisms

A microbial treatment, high-concentration technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It does not involve the harmless treatment of the bacteria mud cake, the large volume of the structure, etc., to achieve the effect of reducing the floor space, good practical prospects, investment and energy consumption.

Inactive Publication Date: 2005-11-02
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this special bacteria is currently only used to treat electroplating wastewater, and Cr in wastewater 6+ <200mg / L, the volume of the culture tank and the purification tank ≥ the daily wastewater treatment volume, the structure is large in size, and the investment is high. It does not involve the development of the culture tank and the purification tank towards high efficiency and equipment, nor does it involve the bacteria mud cake harmless disposal

Method used

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  • Technique and equipment for treating waste liquor containing high concentration chromium by microorganisms
  • Technique and equipment for treating waste liquor containing high concentration chromium by microorganisms
  • Technique and equipment for treating waste liquor containing high concentration chromium by microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The invention processes cold-rolled color-coated steel coil passivation waste liquid containing high concentration of chromium. Cultivation conditions: temperature 38-40°C, pH 7.2-7.5, incubation time 36 hours. Since the pH of the original chromium-containing waste liquid is 3.6, the step of adjusting the pH value in the waste water adjustment tank is omitted. The waste water and the bacterial liquid pass through the pipeline mixer and enter the reaction tank for biochemical reaction according to the ratio of 1:1.5. The flocculation tank is 0.3‰ The cationic PAM flocculant with a concentration of 0.3‰ is added proportionally. After the mixed liquid is separated from the mud and water in the sedimentation tank, the supernatant is filtered through a PE filter and reused. The mud is treated with acid to produce harmless sludge and can be used as recycling The filtrate of chromium, zinc and nickel raw materials. The raw water quality and effluent water quality are randomly...

Embodiment 2

[0038] The present invention treats the high-concentration chromium passivation waste liquid of the cold-rolled hot-dip galvanizing production line. The bacteria cultivation method and the treatment steps are the same as above, except that the bacteria-to-waste ratio is adjusted to 1.7:1. The environmental protection statutory monitoring unit randomly samples and monitors: the influent water quality is: pH3.4, Cr 6+ 2064mg / L, total Cr 2790mg / L, Zn 2+ 366mg / L, Pb 2+ 0.46mg / L, Ni 2+ 0.15mg / L; the water quality of the treated water is: pH7.4, Cr 6+ 2+ 1.26mg / L, Pb 2+ 0.15mg / L, Ni 2+ 0.066mg / L. pH and Cr of effluent after treatment 6+ , total Cr, Zn, and Pb all reach the first-level emission standards stipulated by the state. Table 2 shows the comparison of monitoring results before and after treatment of cold-rolled galvanized sheet passivation high-concentration chromium waste solution.

[0039] pH

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Abstract

The microbe treating process of high concentration chromium containing waste water includes culturing microbe in culture medium containing C, N and P in the ratio of 100 to 1-5 to 0.1-1 at temperature of 15-50 deg.c pH 7-8 and growth period of 24-48 hr; controlling the waste water pH value in 2-4; mixing waste water with microbial liquid for biochemical reaction for 30 min, flocculating with PAM flocculating agent, depositing to separate, filtering, and draining or reusing; and treating separated sludge with acid, filtering and draining or recovering. The said process makes the high concentration chromium containing waste water reach the draining standard while recovering Cr, Zn, Fe and other metals.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to the treatment of high-concentration chromium-containing waste liquid. Background technique [0002] Heavy metals such as chromium and zinc are harmful to natural water bodies, poisonous to humans, fish, and poultry, and may be transformed into more toxic compounds under the influence of the external environment. Chromium will be enriched in animals and humans through the food chain, which will affect the redox and hydrolysis process of substances in the human body, affect the phosphorus content of human tissues, and cause the red blood cells in the blood to carry oxygen. Ulcers cause chronic poisoning, produce various diseases and cancers, and affect human health. Heavy metals cannot be degraded in water bodies, and tend to form sediments and accumulate in the upper layer of sediment near the outfall, becoming a long-term secondary pollution source near the factory area and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00
Inventor 周渝生李昕夏署演李福德俞勇梅
Owner BAOSHAN IRON & STEEL CO LTD
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