Method for treating landfill leachate on basis of electro-Fenton and electroflocculation coupling

A technology of landfill leachate and electroflocculation, which is applied in special compound water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of membrane pollution, difficulty in removing organic matter and heavy metals at the same time, and secondary pollution of concentrated liquid, etc. achieve high efficiency

Inactive Publication Date: 2018-12-04
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the problems of serious membrane pollution, secondary pollution of concentrated liquid, and difficulty in removing organic matter and heavy metals in the existing landfill leachate membrane treatment technology, the purpose of the present invention is to provide a method for t

Method used

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  • Method for treating landfill leachate on basis of electro-Fenton and electroflocculation coupling
  • Method for treating landfill leachate on basis of electro-Fenton and electroflocculation coupling
  • Method for treating landfill leachate on basis of electro-Fenton and electroflocculation coupling

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Experimental program
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Effect test

Embodiment 1

[0034] Landfill leachate volume: 200mL

[0035] Anode: High-purity iron sheet (5cm×4cm×1mm)

[0036] Cathode: modified graphite felt (5cm×4cm×3mm)

[0037] Oxygen flow rate: 100mL / min

[0038] Current intensity: 100mA

[0039] Processing time: 360min

[0040] Reaction temperature: 30±2℃

[0041] Initial pH of untreated landfill leachate: 8.0±0.1

[0042] Initial TOC of untreated landfill leachate: 623±5mg / L

[0043] Depend on figure 2It can be seen that when the initial pH is 8.0, the removal of total organic carbon by electro-Fenton coupled electrocoagulation and pure electro-flocculation is equivalent, and is better than electro-Fenton; The removal of organic carbon was much higher than that of electrocoagulation alone and electro-fenton alone. Adjusting the initial pH to 3.0 by acidification treatment, the soluble TOC decreased by 26.5% to 458±4 mg L –1 . This is because landfill leachate contains a variety of refractory biodegradable organic substances, such as ...

Embodiment 2

[0045] Landfill leachate volume: 200mL

[0046] Anode: High-purity iron sheet (5cm×4cm×1mm)

[0047] Cathode: modified graphite felt (5cm×4cm×3mm)

[0048] Oxygen flow rate: 100mL / min

[0049] Current intensity: 100mA

[0050] Processing time: 360min

[0051] Reaction temperature: 30±2℃

[0052] Adjust the pH of landfill leachate to: 3.0, 5.0, 7.0, 8.0

[0053] Depend on image 3 with Figure 4 It can be seen that when the initial pH is 3.0-5.0, the removal rate of TOC remains at a high level; when the pH is greater than 5.0, the removal rate of TOC decreases obviously with the increase of pH. This is mainly because the generation of hydroxyl radicals is favorable when the initial pH is low, and when the pH is too high, Fe 2+ Easy to generate Fe(OH) 3 Loss of catalytic effect, H 2 o 2 is also easily decomposed into H 2 O and O 2 , leading to a significant reduction in the generation of hydroxyl radicals, thereby reducing the removal rate of TOC. Due to the differ...

Embodiment 3

[0055] Landfill leachate volume: 200mL

[0056] Anode: High-purity iron sheet (5cm×4cm×1mm)

[0057] Cathode: modified graphite felt (5cm×4cm×3mm)

[0058] Oxygen flow rate: 100mL / min

[0059] Current intensity: 100mA

[0060] Processing time: 360min

[0061] Reaction temperature: 30±2℃

[0062] The initial landfill leachate pH: 5.0

[0063] Depend on Figure 5 It can be seen that after electrocoagulation coupled with electro-Fenton treatment, the fluorescence intensity in each region gradually decreased. After 360 minutes of treatment, the overall fluorescence intensity decreased significantly, and the characteristic fluorescence peaks in several regions basically disappeared. Depend on Image 6 It can be seen that the content of fulvic acids (region III) and humus-like substances (region V) in the original landfill leachate reverse osmosis concentrate is relatively high, and the content of aromatic protein substances (region I) that is easy to be degraded by microorga...

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Abstract

The invention relates to a method for treating landfill leachate on the basis of electro-Fenton and electroflocculation coupling. According to the method, ferrum or a stainless-steel electrode servesas an anode, carbon fibers or modified carbon fibers serve as a cathode, dissolved oxygen is subjected to a two-electron oxygen reduction reaction on the surface of the cathode so as to produce hydrogen peroxide, and the produced hydrogen peroxide and Fe(II) produced by the anode are subjected to a catalyzed reaction so as to produce a strong oxidant hydroxyl free radical; and anode-produced and ferrous-oxidated-produced Fe(III) is subjected to a series of hydrolysis and polymerization processes so as to form a variety of hydroxyl complexes and hydroxides, and thus, colloidal impurities, suspending impurities and heavy-metal ions in the landfill leachate are subjected to flocculating settling and are separated. According to the method, hydrogen peroxide is produced in situ, the risk generated during the transportation, storage and use of the hydrogen peroxide is avoided, the treatment process is clean, and hydrogen peroxide and a flocculant are not required to be externally and continuously added. According to the method, electroflocculation and electro-Fenton technologies are combined, electrode materials are cheap and readily available, the preparation method is simple, the treatment cycle is short, and refractory organic matters and heavy-metal ions can be effectively removed from the landfill leachate.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for treating landfill leachate based on electro-Fenton coupling electro-flocculation. Background technique [0002] With the rapid development of my country's social economy, the population is increasing rapidly, and domestic garbage is increasing day by day. At present, the problem of landfill leachate has become a "bottleneck" for the harmless disposal of waste. If it is not handled properly, it will seriously pollute the surrounding environment and endanger surrounding animals. The health of plants and even the general public. [0003] Landfill leachate has complex components and contains a variety of refractory organic pollutants and heavy metal ions (such as As, Cd, Cr, Cu, Pb, etc.). Conventional water treatment technologies cannot deeply treat persistent and refractory organic substances (such as Bisphenol A, phthalates, polycyclic aromatic hydrocarbons, e...

Claims

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Application Information

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IPC IPC(8): C02F1/463C02F1/461C02F1/72C02F1/74
CPCC02F1/46109C02F1/463C02F1/4672C02F1/727C02F1/74C02F2001/46133C02F2001/46152C02F2305/023C02F2305/026
Inventor 张芳刘顿李广贺张旭张昊袁英魏雨泉
Owner TSINGHUA UNIV
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