Oxidation treatment method for leachate biological treatment effluent

A treatment method and oxidant technology, applied in the direction of contaminated groundwater/leachate treatment, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of acid and alkali consumption, secondary pollution, large amounts of chemical sludge, etc. Achieve the effect of reducing treatment cost, good oxidation effect and reducing use cost

Inactive Publication Date: 2017-07-25
HUAZHONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

It is characterized in that it first adopts coagulation pretreatment, and then catalyzes the oxidant H by using a hydrotalcite-like (LDH) catalyst. 2 o 2 And the oxidant PMS (potassium hydrogen persulfate), produce OH and SO 4 - Equal free radicals, use free radicals to oxidize refractory organic matter, improve the biodegradability of leachate, thus solve the problem of using membrane technology to further treat leachate biological treatment of effluent to produce a large amount of organic matter and salt concentrate, using Fenton The technical problems of producing a large amount of chemical sludge, consuming a large amount of acid and alkali, and introducing secondary pollution during advanced treatment with ozone oxidation technology

Method used

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  • Oxidation treatment method for leachate biological treatment effluent
  • Oxidation treatment method for leachate biological treatment effluent
  • Oxidation treatment method for leachate biological treatment effluent

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preparation example Construction

[0069] Wherein the preparation method of hydrotalcite-like catalyst comprises the steps:

[0070] (1) Prepare solution A: prepare one or more nitrate, magnesium nitrate and aluminum nitrate solutions in transition metal Co, Fe and Cu, obtain solution A after mixing, wherein the molar concentration ratio of magnesium nitrate and aluminum nitrate is 2~4:1; the mole percentage of the transition metal is 1%~5%;

[0071] (2) Prepare solution B: prepare a 0.3mol / L sodium carbonate solution to obtain solution B;

[0072] (3) Co-precipitation of solution A and solution B: add solution A described in step (1) dropwise to solution B described in step (2) at a speed of 100 to 150 ml / h to carry out coprecipitation reaction. Then continue to stir for 1-1.5 hours, and then conduct ultrasound to obtain a mixed solution, which is left to stand for 18-24 hours to obtain a co-precipitation system;

[0073] (4) Obtaining the hydrotalcite-like catalyst: the co-precipitation system described in ...

Embodiment 1

[0080] The method of heterogeneous catalytic oxidation of the present invention is used to treat the COD of the effluent of the domestic garbage leachate MBR system, wherein the catalysts are selected from five different catalysts prepared by the preparation method of the present invention, namely CoFe@MgAl, CoCu@MgAl, Co @MgAl, Co@ZnAl and CoFe@ZnAl, the oxidant is H 2 o 2 and PMS to form a double oxidant.

[0081] Taking CoFe@MgAl as an example, its preparation method includes the following steps:

[0082] (1) Prepare solution A: prepare nitrate, magnesium nitrate and aluminum nitrate of transition metal Co and Fe, and obtain solution A after mixing, wherein the molar concentration ratio of magnesium nitrate and aluminum nitrate is 3:1; transition metal Co and Fe The molar ratio is 4.76% (the sum of the molar weights of Co and Fe accounts for the molar percentage of all metal molar weights);

[0083] (2) Prepare solution B: prepare a 0.3mol / L sodium carbonate solution to ...

Embodiment 2

[0094] The COD of the domestic waste leachate MBR system treated water is treated by using the heterogeneous catalytic oxidation method of the present invention. The catalyst is the LDH catalyst with the prepared CoFe@MgAl structure, and the characteristics of the leachate are shown in Table 3.

[0095] Table 3 Leachate MBR effluent characteristics

[0096]

[0097] Put 10mL leachate MBR system treated effluent into 20mL reaction device, add corresponding catalyst and oxidant, and the reaction time is 3 hours.

[0098] Reaction 1: Catalyst 1g / L+H 2 o 2 Dosage 0.5mol / L; (single H 2 o 2 )

[0099] Reaction 2: catalyst 1g / L + potassium persulfate compound salt dosage 5g / L; (single PMS, PMS2.35g / L)

[0100] Reaction 3: H 2 o 2 Dosage 0.5mol / L+potassium persulfate compound salt dosage 5g / L; (without catalyst, PMS 2.35g / L)

[0101] Reaction 4: Catalyst 1g / L+H 2 o 2 Dosage 0.5mol / L + potassium persulfate compound salt dosage 5g / L; (double oxidant, of which PMS 2.35g / L) ...

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Abstract

The invention discloses an advanced oxidation method for higher COD (Chemical Oxygen Demand) of leachate biological treatment effluent. The deep oxidation method comprises the following steps: feeding H2O2 and PMS as dual oxidants; feeding a CoFe@MgAl-LDH hydrotalcite catalyst for catalyzing the H2O2 and the PMS to generate .OH and SO4<->.; meanwhile, synergizing the PMS with the H2O2 to generate more .OH, prolonging action time, and further oxidizing to remove refractory organic compounds. According to the advanced oxidation method disclosed by the invention, by adopting multiphase catalytic dual oxidants, the problems that a large amount of concentrated solutions are generated in a membrane treatment method which is mainly adopted by an existing advanced treatment method for leachate, a large amount of chemical sludge is generated in an adopted Fenton oxidation process, secondary pollution metal ions are introduced and the like are solved; according to engineering requirements, coagulation also can be adopted for pretreatment before multiphase oxidation. The advanced oxidation method disclosed by the invention is a clean and high-efficiency advanced oxidation treatment method for the leachate; in addition, the treatment cost is controlled, and the treatment effect is guaranteed.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically, relates to an oxidation treatment method in which the COD of leachate biological treatment effluent is still relatively high, and more specifically, relates to a coagulation-heterogeneous catalysis of leachate biological treatment effluent Oxidation deep oxidation treatment method. Background technique [0002] Landfill leachate is an inevitable secondary pollutant produced in the process of waste transfer station, landfill treatment and incineration treatment. As a mature leachate treatment technology, the biological treatment method has been widely used in the treatment of landfill leachate, but the effluent of landfill leachate biological treatment still contains a high concentration of refractory organic matter, etc., which cannot meet the current discharge standards and must be Do deep processing. [0003] Membrane technology is a traditional leachate advanced tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01J23/75B01J23/80C02F103/06
CPCC02F1/725B01J23/007B01J23/75B01J23/80C02F1/722C02F2103/06
Inventor 陈朱琦侯鹏飞陈朱蕾廖朱玮王华斌王启亮
Owner HUAZHONG UNIV OF SCI & TECH
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