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Method for processing heavy metal wastewater

A technology for heavy metals and wastewater, applied in water/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of hydrogen sulfide secondary pollution, high treatment cost, long reaction residence time, etc., and achieve low cost , remove the effect of high efficiency

Inactive Publication Date: 2008-08-20
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Abstract
  • Description
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Problems solved by technology

Chinese Patent ZL 96117479.X "Composite Functional Bacteria for Treating Electroplating Wastewater, Its Cultivation Method and Its Application Method" adopts five strains of Desulfobacillus, Desulfovibrio, Enterobacter cloacae, Desulfur Enterobacter and Bacillus to form a composite bacteria. Patent ZL 93106616.6 has greatly improved the theoretical basis and practicability of removing heavy metals in electroplating wastewater, but the reaction residence time is long and the pH value is limited to the range of 5.0 to 7.5
Chinese patent ZL00112916.3 "Method for Treating Metal-Containing Wastewater by Biochemical Method" adopts Desulfobacillus, Enterobacter cloacae, and Enterobacter desulfurum to form composite bacteria and proposes: "Bacteria and wastewater are added to the reaction tank at a volume ratio of 1:10 for reaction. After the reaction Then add 0.05 to 5 kg of chemical reagent Na per ton of wastewater 2 S or / and FeS to remove heavy metal ions in wastewater, this method basically relies on adding Na 2 S or / and FeS to remove heavy metal ions in wastewater, its treatment cost is high, and there is a secondary pollution problem of hydrogen sulfide

Method used

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  • Method for processing heavy metal wastewater
  • Method for processing heavy metal wastewater
  • Method for processing heavy metal wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: Treatment of high-concentration chromium-containing wastewater in a certain workshop of a cold-rolling factory

[0034] Add the medium containing 0.5% lactic acid protein salt, 1% ferrous salt and 1% sulfate and K, Mg, Ca, Cu, Mn, B, Si, Mo elements in the incubator to adjust pH7. 0~7.4, add compound bacterial agent, control temperature 30°C, anaerobic or facultative culture for 36 hours, generate nano-FeS x compound for use.

[0035] Processing 0.4m per hour 3 High concentration chromium wastewater, wastewater (W) and bionano FeS x The ratio of (BN) is 2:1, after static mixing, reactor reaction for 30min. Add 1‰ of cationic polyacrylamide (PAM) to flocculate and precipitate and filter to measure chromium and sulfide in water. It can be seen from Table 1 that the total chromium (TCr≤0.17mg / L) and hexavalent chromium (Cr 6+ ≤0.05mg / L) are better than the first-level emission standard of the national standard (TCr1.5mg / L, Cr 6+ 0.5mg / L), no S was detected...

Embodiment 2

[0039] Example 2: Treatment of leachate from a certain chromium slag mountain

[0040] Add the culture medium that contains 5% lactic acid protein salt, 10% ferrous salt and 10% sulfate and K, Mg, Ca, Cu, Mn, B, Si, Mo elements in the incubator, adjust pH7. 0~7.4, add compound bacterial agent, control temperature 35°C, anaerobic or facultative culture for 48 hours, generate nano-FeS x compound for use.

[0041] The leachate contains Cr 6+ 5500mg / L, TCr 5800mg / L, pH14, treatment 9m per hour 3 Leachate, W / BN=1:1. After static mixing, reactor reaction, precipitation and filtration, the results are listed in Table 2. It can be seen that TCr≤0.21mg / L and Cr in the effluent 6+ ≤0.05mg / L are superior to the first-level discharge standard of the national standard, and no S is detected in the effluent 2- . The recovery rate of Cr in the sludge is greater than 97.5%.

[0042] Table 2 Treatment results of leachate from a chromium slag mountain Unit: mg / L

[0043]

[0044] Not...

Embodiment 3

[0045] Embodiment 3: A certain mining waste liquid treatment

[0046] Add the medium containing 3% lactic acid protein salt, 6% ferrous salt and 6% sulfate and K, Mg, Ca, Cu, Mn, B, Si, Mo elements in the incubator to adjust pH7. 0~7.4, add compound bacterial agent, control temperature at 39°C, anaerobic or facultative culture for 72 hours, generate nano-FeS x compound for use.

[0047] The waste liquid contains Cr 6+ 1280mg / L, V3800mg / L, pH2~3, 1m per hour 3 Waste liquid, W / BN=1:3. After static mixing, reactor reaction, precipitation and filtration, the results are listed in Table 3. It can be seen that Cr in the effluent 6+ ≤0.05mg / L, TCr≤0.15mg / L, V≤0.01mg / L, all better than the national standard and the primary discharge standard of Sichuan Province, no S was detected in the effluent 2- . The recovery rate of Cr in the sludge is greater than 96%, and the recovery rate of vanadium is greater than 93%.

[0048] Table 2 Treatment results of leachate from a chromium sl...

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Abstract

The invention relates to a removal method of heavy metal ion in wastewater, such as chrome, belonging to the technical field of wastewater treatment. The removal method is characterized in that nanometer FeSx is produced by culturing a compound bacteria comprising desulfovibrio Sp. CB1. 268, desulfotomaculum Sp. CB1.139, and desulfobacter Sp. CB1.168 in a culture medium comprising lactic acid proteinate, ferrite, sulfate, K, Mg, Ca, Cu, Mn, B, Si, and Mo under anaerobic or facultative, and alkaline condition at the temperature between 30 and 39 DEG C for thirty-six to 72 hours; the nanometer FeSx is dissociated into S<2-> and Fe<2+> under acidic condition, can reduce Cr<6+> to Cr<3+>, and generate unsolvable sedimentation of metal sulphides with Ni<2+>, Cu<2+>, Zn<2+>, and other elements; after the sedimentation is separated, the metal ions in the wastewater are removed. The removal method has the advantages of high removal efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for removing heavy metal ions such as chromium in waste water. Background technique [0002] At present, there are more than 20 kinds of methods for treating heavy metal wastewater at home and abroad, including physical methods, chemical methods and biological methods. These methods have their own advantages and disadvantages. Seeking a more effective treatment method is always the goal that people yearn for. Chinese patent ZL 93106616.6 "Methods for Microbial Treatment of Electroplating Wastewater" firstly proposed a composite bacteria composed of four strains of Fusobacterium nucleatum, Paracoccus denitrificans, Edwardsiella tarda and Peptococcus anaerobic, which is effective for low concentrations (≤80mg / L ) Cr, Zn, Cu, Ni electroplating wastewater treatment has a better effect. Chinese Patent ZL 96117479.X "Composite Functional Bacteria fo...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F3/34C12N1/20C02F101/20
Inventor 李福德李昕吴全珍李旭东
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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