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A method for treating wastewater by adding hydrogen peroxide to the electric Fenton
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A technology for treating wastewater and sewage, which is applied in the field of electro-Fenton treatment of wastewater with H2O2 added, and can solve the problems of unfavorable Fenton reaction, limited removal efficiency of organic matter, and low electro-Fenton treatment efficiency.
Active Publication Date: 2019-09-24
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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while for the conventional added H 2 o 2 The electric Fenton method, because there is no need to generate H for the cathode 2 o 2 Provide dissolved oxygen, and it is generally believed that aeration will remove the Fe in the electro-Fenton system 2+ converted to Fe 3+ , is not conducive to the Fenton reaction, so no aeration
[0006] However, conventionally applied H 2 o 2 The treatment efficiency of the electric Fenton method is still low, and even with a longer hydraulic retention time, its removal efficiency for organic matter is still limited
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Embodiment 1
[0053] Take reverse osmosis concentrated water from a petrochemical company, its COD Cr It is 60.20~82.77mg / L, the turbidity is 1.12~3.15NTU, and the conductivity is 9020~9150μS / cm.
[0054] according to figure 1The process shown is for treatment, but does not include screen filtration, water quality and quantity adjustment, and sludge thickening and dewatering processes. The anode is made of iron plate, the cathode is made of stainless steel plate, through 1mol / L H 2 SO 4 The solution is adjusted to obtain acidic wastewater with pH=4;
[0055] The experimental power supply adopts constant current mode, and the current density is 10mA / cm 2 , the acidic wastewater flows through the reactor at a flow rate of 0.5m / s, and H is added to the source of the acidic wastewater 2 o 2 , so that the H in the acidic wastewater at the source 2 o 2 The concentration is 150mg / L, and air is introduced into the system through aeration at the same time. The hydraulic retention time in th...
Embodiment 2
[0068] The secondary sedimentation effluent of paper deinking wastewater from a paper mill was taken, and its COD was determined cr It is 451.4~511.6mg / L.
[0069] It is processed by the same device as in Example 1, the anode adopts an iron plate, and the cathode adopts a stainless steel plate, and the H of 1mol / L 2 SO 4 The solution is adjusted to obtain acidic wastewater with pH=4.
[0070] The experimental power supply adopts constant current mode, and the current density is 10mA / cm 2 , Acidic waste water flows through the reactor at a flow rate of 0.5m / s. Dosing H at the source of acidic wastewater 2 o 2 , such that at the source H 2 o 2 The concentration is 300mg / L. At the same time, oxygen is introduced into the system through aeration. The aeration rate is 2000mL / (L min). The hydraulic retention time in the Fenton reaction tank is 30min;
[0071] After the reaction, the wastewater was settled in the sedimentation tank for 30 minutes, and the supernatant was tak...
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Abstract
The invention provides an electro-Fenton waste water treatment method by adding H2O2. The method comprises the following steps of: regulating a pH (potential of hydrogen) of waste water to be acid to form acid waste water, performing continuous flow decontamination treatment on the acid waste water under a continuous aeration condition to form oxidized waste water, and performing flocculation precipitation treatment on the oxidized waste water, wherein the continuous flow decontamination treatment comprises the steps of adding H2O2 to a source of the acid waste water, taking an iron-containing electrode as an anode and an inert electrode as a cathode, and supplying direct current to the acid waste water added with H2O2 for electro-Fenton reaction decontamination. Experimental results show that a removal rate of a COD (chemical oxygen demand) can reach 57.1%, and a removal rate of TOC (total organic carbon) can reach 41.6% 10min after the method is used for treating reverse osmosis concentrated water of a petrochemical enterprise; and the removal rates of the COD and the TOC are 61.8% and 47.2% respectively 30min after treatment.
Description
technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a 2 o 2 The Electro-Fenton Method for Treating Wastewater. Background technique [0002] Electro-Fenton method has become a new type of electrochemical advanced oxidation technology based on Fenton chemical reaction, which is popular in recent years because of its advantages of easy process control, high treatment efficiency, and environmental friendliness. When using the Fenton method to treat wastewater, an electric current is passed through the solution, and all or part of the reagents required for the Fenton reaction are generated through the cathode and anode reactions, and OH is generated. Fe required by Fenton's reagent 2+ It can be obtained by external dosing, anodic iron oxidation, and cathodic iron reduction; while H 2 o 2 It can be produced by external dosing or cathodic reduction. According to H 2 o 2 Different production methods, the electric Fen...
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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 张忠国吴月孙宇维何沛然张健宫晨皓梁爽
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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