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Method for synchronously removing heavy metals and organic matters from wastewater

A technology for organic matter and heavy metals, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., to achieve the effects of improving degradation efficiency, mild reaction conditions, and reducing chemical dosage

Active Publication Date: 2017-11-07
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems and deficiencies existing in the existing industrial wastewater treatment technology of coexistence of heavy metals and organic substances, and to provide a new method for simultaneously removing heavy metals and organic substances. Oxygen-functional catalysts catalyze molecular oxygen to produce strong oxidizing species, realize the precipitation and removal of heavy metal crystals, and at the same time catalyze and oxidize and degrade organic pollutants, so as to creatively use waste to treat waste to achieve green oxidation, shorten the treatment process, improve treatment efficiency, and reduce economic costs. cost, promote the industrial application of technology

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  • Method for synchronously removing heavy metals and organic matters from wastewater

Examples

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Effect test

Embodiment 1

[0038] Take a certain electroplating wastewater, pH=6.3, the initial concentration and removal rate of pollutants in this water sample are shown in Table 1.

[0039] (1) Anoxic reaction: take 1L of the industrial wastewater, add FeSO to it 4 ·7H 2 O 2.78g, then the molar concentration of Fe is 10mmol / L. The sum of the molar concentrations M of heavy metal ions in the wastewater is 4.0mmol / L, then the molar ratio of Fe to M is 2.5:1, which meets the technical characteristics of greater than 2:1; the COD concentration in the wastewater is 120mg / L, and the Fe mass concentration and COD concentration The ratio is 4.7:1, which meets the technical characteristics of greater than 3:1. Add the adjusted wastewater to the anoxic tank, control the dissolved oxygen concentration of the wastewater to less than 1.0 mg / L, adjust the pH to 7.0, and react for 10 minutes to generate FeM catalyst with high activity in situ.

[0040] (2) Incubation reaction: After the reaction in the anoxic ta...

Embodiment 2

[0046] Take a certain electroplating wastewater, pH=2.1, the initial concentration and removal rate of pollutants in this water sample are shown in Table 2.

[0047] (1) Anoxic reaction: take 1L of the industrial wastewater, add FeSO to it 4 ·7H 2 O 3.34g, then the molar concentration of Fe is 12mmol / L. The total molar concentration M of heavy metal ions in the wastewater is 4.7mmol / L, then the molar ratio of Fe to M is 2.5:1, which meets the technical characteristics of greater than 2:1; the COD concentration in the wastewater is 60mg / L, and the Fe mass concentration and COD concentration The ratio is 11.2:1, which meets the technical characteristics of greater than 3:1. Add the adjusted wastewater to the anoxic tank, control the dissolved oxygen concentration of the wastewater to less than 1.0 mg / L, adjust the pH to 7.0, and react for 20 minutes to generate FeM catalyst with high activity in situ.

[0048] (2) Incubation reaction: After the reaction in the anoxic tank, th...

Embodiment 3

[0054] Take a certain titanium dioxide production wastewater, pH = 1.2, the initial concentration and removal rate of pollutants in this water sample are shown in Table 3.

[0055] (1) Anoxic reaction: Take 1L of this industrial wastewater, because the mass concentration of Fe in the wastewater is 3148mg / L, that is, the molar concentration is 56mmol / L. And the molar concentration sum M of heavy metal ions in the waste water is 2.1mmol / L, then the molar ratio of Fe and M is 26.2:1, accords with the technical feature greater than 2:1; COD concentration is 447mg / L in the waste water, Fe mass concentration and COD The concentration ratio is 7.0:1, which meets the technical characteristics of greater than 3:1, so Fe ions are no longer added to the wastewater. Add the adjusted wastewater to the anoxic tank, control the dissolved oxygen concentration of the wastewater to less than 1.0 mg / L, adjust the pH to 7.0, and react for 30 minutes to generate FeM catalyst with high activity in ...

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Abstract

The invention relates to a method for synchronously removing heavy metals and organic matters from wastewater. The method comprises four steps, namely anoxic reaction, incubation reaction, aerobic reaction and precipitation reaction, and problems and defects in an existing heavy metal and organic matter coexisting industrial wastewater treatment technology are solved. Compared with the prior art, the method provided by the invention has the advantages that a catalyst with a molecular oxygen activating function is generated in situ by virtue of regulation heavy metal ions in wastewater, molecular oxygen is catalyzed to produce a strong oxidization species, and oxidation and degradation of organic pollutants are catalyzed while heavy metal crystals and precipitates are removed, so that wastes are treated by using wastes creatively, green oxidization is realized, a treatment working procedure is shortened, treatment efficiency is improved, economic cost is reduced, and technology industrialization application is promoted.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for synchronously removing heavy metals and organic matter in wastewater. Background technique [0002] Heavy metals and organic pollutants exist in the industrial wastewater of electroplating, metal smelting, tanning, textile production, printing and dyeing, papermaking and other industries. [0003] For wastewater where heavy metals and organic matter coexist, the traditional treatment method is a step-by-step method to remove heavy metals and organic matter separately. Chemical static precipitation or physical adsorption is used to remove heavy metals; for the removal of organic matter, B / C suitable sewage is passed through traditional activated sludge or biofilm method, and measures such as advanced oxidation method are used for industrial wastewater that is difficult to biochemically treat. In addition, methods that can simultaneously remove heavy met...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/20C02F101/30
CPCC02F1/52C02F1/725C02F3/12C02F3/28C02F9/00C02F2001/007C02F2101/20C02F2101/30C02F2209/06C02F2209/08C02F2209/22C02F2305/023
Inventor 吴德礼田泽源张亚雷马鲁铭
Owner TONGJI UNIV
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