Wastewater treatment apparatus, wastewater treatment method, and wastewater treatment system

A waste water treatment and waste water technology, applied in metallurgical waste water treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of low treatment efficiency and achieve the effect of reducing the concentration of heavy metals

Inactive Publication Date: 2012-07-25
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is considered that the metal complex is not filtered and separated by the filter and leaks to make the treatment efficiency low.
[0009] In addition, it is believed that when acid zinc electroplating is carried out, a large amount of ammonia is contained in the solution, and the treatment efficiency is low due to the formation of ammonium complexes between heavy metals and ammonia

Method used

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  • Wastewater treatment apparatus, wastewater treatment method, and wastewater treatment system
  • Wastewater treatment apparatus, wastewater treatment method, and wastewater treatment system
  • Wastewater treatment apparatus, wastewater treatment method, and wastewater treatment system

Examples

Experimental program
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Embodiment approach

[0129] The wastewater treatment device of the present invention is not limited to figure 1 The processing device 1 is shown. For example, in figure 1 The treatment device 1 provided with the pH adjustment device 50 does not need to include the pH adjustment device 50 if the pH of the filtered water W1 already matches the discharge pH to a river or the like.

[0130] In addition, when a chlorine-based oxidizing agent is added from the oxidizing agent adding device 22 to the oxidation treatment facility 20, odorous components such as chlorine gas or chloramine generated by oxidation of ammonia may be generated. Therefore, it is desirable to properly set up the gas recovery equipment according to the concentration generated.

[0131] Specific examples of gas recovery facilities include exhaust gas scrubbers and activated carbon-type gas purification devices.

[0132] in addition, figure 1 The processing device 1 has a full-scale membrane separation device 40, but as figu...

Embodiment 1

[0222] As the wastewater, nickel-containing wastewater discharged from the electroless nickel plating process was used. The concentration of nickel in the waste water is 6.5mg / L. In addition, this waste water contains ammonia as a complex-forming compound. Ammonia concentration, expressed as ammoniacal nitrogen (NH 3 -N) concentration was 3.8mg / L.

[0223] 0.5 mL of sodium hypochlorite solution (available chlorine concentration: 12% by mass) was added as an oxidizing agent to 500 mL of the nickel-containing wastewater, and stirred for 15 minutes to oxidize ammonia (oxidation treatment step).

[0224]Then, in the oxidized waste water, add sodium hydroxide solution adjusted to 0.1 mol / L as an insolubilizer to adjust the pH to 10, stir for 30 minutes, and generate nickel insoluble matter (insolubilization treatment process).

[0225] Next, the insolubilization-treated wastewater was subjected to membrane separation using a hollow fiber membrane made of polyvinylidene fluoride ...

Embodiment 2

[0229] An oxidation treatment step was carried out in the same manner as in Example 1.

[0230] To the nickel-containing wastewater after the oxidation treatment step, 2.5 mL of an aqueous solution of sodium sulfate 9 hydrate adjusted to 0.1 mol / L was added, and stirred for 30 minutes to generate nickel insoluble matter (insolubilization treatment step).

[0231] Next, a membrane separation step was carried out in the same manner as in Example 1, the concentrations of nickel and ammoniacal nitrogen in the filtered water were measured, and the particle distribution of nickel insoluble matter was measured. These results are shown in Table 1.

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Abstract

A wastewater treatment apparatus (1) of the present invention is provided with: an oxidation treatment means (20) for oxidizing a metal complex-forming compound contained in wastewater (W0) that contains at least a heavy metal and the metal complex-forming compound; an insolubilization treatment means (30) for insolubilizing the heavy metal in the oxidized wastewater (W0); and a membrane separation means (40) for separating the insolubilized wastewater (W0) through a membrane. In addition, a wastewater treatment method of the present invention uses the above-described wastewater treatment apparatus. The present invention is capable of providing a wastewater treatment apparatus, a wastewater treatment method and a wastewater treatment system, each of which is capable of highly treating wastewater that contains a heavy metal and a metal complex-forming compound without adding a flocculant to the wastewater, and each of which is capable of sufficiently decreasing the heavy metal concentration.

Description

technical field [0001] The invention relates to a wastewater treatment device, a treatment method and a wastewater treatment system for treating wastewater containing heavy metals. [0002] The priority claimed by this application is Japanese Patent Application No. 2011-009902 for which it applied in Japan on January 20, 2011, and the content is used here. Background technique [0003] Conventionally, methods for removing heavy metals from heavy metal-containing wastewater such as electroplating wastewater discharged from the electrolytic plating process generally include the following methods. [0004] For example, if Figure 6 As shown, at first the waste water W temporarily stored in the storage tank 11 0 The insolubilization treatment is performed in the insolubilization tank 31 . Specifically, an insolubilizing agent such as a hydroxide (alkali agent) or a sulfiding agent is added to wastewater to make heavy metals insoluble in water such as hydroxides or sulfides. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/76C02F1/44
CPCC02F1/66C02F1/76C02F9/00C02F2209/04C02F2103/16C02F2101/20C02F1/44
Inventor 川岸朋树大城哲也
Owner MITSUBISHI RAYON CO LTD
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