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Microbial apparatus for treating high concentration waste chromium solution

A microbial treatment, high-concentration technology, applied in biological water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc. It does not involve the harmless treatment of bacteria mud cakes, large structures, etc., and achieves the effects of reduced floor space, reduced structures and energy consumption, and good practical prospects

Inactive Publication Date: 2007-12-19
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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  • Microbial apparatus for treating high concentration waste chromium solution
  • Microbial apparatus for treating high concentration waste chromium solution
  • Microbial apparatus for treating high concentration waste chromium solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 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 randoml...

Embodiment 2

[0040] 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. Random sampling and monitoring by the environmental protection statutory monitoring unit: 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. The pH, Cr leaves, total Cr, Zn and Pb of the effluent after treatment all meet the first-level discharge 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.

[0041] Table 2 Unit: mg / L

[0042] ...

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Abstract

The microbial process for treating high concentration waste chromium solution includes the following steps: culturing microbe in culture medium containing C, N and P in the ratio of 100 to 1-5 to 0.1-1 at 15-50 deg.c and pH 7-8 for 24-48 hr; mixing the waste water and the microbe liquid to produce biochemical reaction for at least 30 min; flocculating treatment through throwing PAM flocculant to improve sludge depositing performance, depositing separation, filtering and draining or reusing the treated water; adding acid to the separated sludge, filtering and draining or reusing the treated sludge. The microbial process can make the effluent reach draining standard, and recover Cr, Zn, Fe and other metals.

Description

[0001] This application is a divisional application of the application dated April 28, 2004, the application number is 200410017995.9, and the title of the invention is "process and device for microbiological treatment of waste liquid containing high concentration of chromium". technical field [0002] The invention relates to waste water treatment technology, in particular to a treatment device for high-concentration chromium-containing waste liquid. Background technique [0003] 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, affecting the oxidation-reduction and hydrolysis process of substances in the human body, affecting the phosphorus content of human tissues, making the red blood cells in the blood dysfunction in carrying oxygen, and c...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F1/62C02F1/52
Inventor 周渝生李昕夏暑演李福德俞勇梅
Owner BAOSHAN IRON & STEEL CO LTD
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