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Cathode electrochemical microfiltration membrane coupled reactor suitable for removal of source water pollutants

A microfiltration membrane and electrochemical technology, applied in water pollutants, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as difficult removal of small molecule pollutants, decreased permeability, secondary point source pollution, etc. Achieve the effects of reducing the frequency of membrane cleaning, promoting the generation of oxidant species, and alleviating membrane fouling

Active Publication Date: 2018-08-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-pressure membrane filtration technologies such as microfiltration and ultrafiltration are difficult to remove small molecular refractory pollutants (<1000 Da) in practical applications.
These pollutants can not only be adsorbed in the membrane pores, leading to a decrease in the permeability of the membrane, but also difficult to remove by traditional biological treatment methods (such as sulfonated aromatic amines that are difficult to biodegrade), once discharged, it will cause secondary point source pollution

Method used

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  • Cathode electrochemical microfiltration membrane coupled reactor suitable for removal of source water pollutants
  • Cathode electrochemical microfiltration membrane coupled reactor suitable for removal of source water pollutants

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of cathode electrochemical microfiltration membrane coupled reactor, comprising stabilized DC power supply 1, graphite plate anode 2, electrochemical microfiltration membrane cathode 3, gas diffuser 4, gas flow meter 5, air pump 6 and reaction Device housing 7. like figure 1 As shown, in the cathode electrochemical microfiltration membrane coupling reactor, the positive pole and negative pole of the regulated DC power supply 1 are respectively connected to the graphite plate anode 2 and the electrochemical microfiltration membrane cathode 3 through copper wires; the electrochemical microfiltration membrane cathode 3 Placed in the upper part of the reactor, the graphite plate anode 2 is symmetrically arranged on both sides of the cathode 3 of the electrochemical microfiltration membrane, and the distance between the plates is 1cm; a gas diffuser 4 is installed directly below the cathode, and a gas flow meter 5 and an air pump 6 are installed to cont...

Embodiment 2

[0026] The system in Example 1 was used to treat simulated low-concentration p-aminobenzenesulfonic acid (SA) wastewater, the influent SA concentration was 10 μM, the initial pH of the influent was 7, and 50 mM Na 2 SO 4 As an electrolyte, the electrolysis time was 1 h. One set of reactors was set to operate in batch mode, and the applied voltage was 2V; two sets of reactors were set to operate in continuous flow mode, and the electrochemical microfiltration membrane cathode was operated at a flux of 140 L / (m 2 h) Operation (hydraulic retention time is 1 h), the experimental group uses 2 V external voltage, and the control group operates under open circuit conditions. During the reaction time of 1 h, the removal rates of SA in batch experiment group, continuous flow experiment group and continuous flow control group were 67 %, 80 % and 0 %, respectively.

Embodiment 3

[0028] Use the system of Example 1 to treat high-concentration SA wastewater, using influent SA concentration of 150 μM, influent initial pH of 7, and adding 50 mM Na 2 SO 4 As an electrolyte, the electrolysis time was 1 h, and an applied voltage of 2 V was used. Two sets of reactors were set up to operate in continuous flow and batch operation modes respectively. Among them, the cathode of the electrochemical microfiltration membrane in the continuous flow experimental group had a flux of 140 L / (m 2 h) Operation (hydraulic retention time 1 h). Within a reaction time of 1 h, the removal rates of SA in the batch experiment group and the continuous flow experiment group reached 70% and 90%, respectively; under electrochemical action, the main degradation products of SA were formic acid, acetic acid, and oxalic acid, which were easily biodegradable. Degraded small molecule carboxylic acids, the total organic carbon (TOC) of small molecule carboxylic acids in the effluent water ...

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Abstract

The invention relates to a cathode electrochemical microfiltration membrane coupled reactor suitable for removal of source water pollutants. The reactor provided by the invention adopts graphite as ananode and a flat plate microfiltration membrane module with an internally-embedded steel wire mesh as a cathode, an external electric field is applied by a regulated direct current power supply, thereactor is operated in a continuous flow mode, so that physical interception removal of particles, colloids and macromolecular pollutants in source water can be realized, and degradation removal of refractory organic matter can be realized by utilizing strong oxidizing substances generated by electrocatalysis; in the reactor, in addition to HO free radicals formed by a water decomposition reactionon the surface of the anode, a Fenton reaction is performed on H2O2 generated on the surface of the cathode in situ under the external electric field and aeration conditions and Fe(II) dissolved fromthe steel wire mesh in a cathode interface and a homogeneous solution to form strong oxidants such as HO free radicals and Fe(IV)O<2+>, and therefore oxidative degradation removal of small-molecule refractory organic matter in the source water is realized; and the reactor couples electrochemical oxidation and microfiltration membrane separation technologies, can realize high-efficiency removal ofthe refractory organic matter in a lower external voltage and shorter hydraulic retention time, and reduces operating energy consumption.

Description

technical field [0001] The invention belongs to the fields of environmental protection and water treatment, and in particular relates to a cathode electrochemical microfiltration membrane coupled reactor suitable for removing water pollutants from water sources. Background technique [0002] The world is facing an increasingly serious shortage of water resources. In recent years, with the development of industry and the acceleration of urbanization, the source water used by many public utilities has been polluted to varying degrees. It comes from various hazardous wastes. Disposal, wastewater discharge and runoff containing agricultural fertilizers and pesticides. In China, more than half of lakes and groundwater do not meet water supply standards. With the increasingly stringent quality standards of drinking water for residents, it is the focus of urgent research and practice to seek countermeasures and treatment technologies for polluted water sources. [0003] In the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/44C02F1/72
CPCC02F1/444C02F1/4672C02F2101/38C02F2101/40C02F2201/4619C02F2305/026
Inventor 王志伟徐少萍郑君健闫凯丽李子梦平梦傅炜程王巧英吴志超
Owner TONGJI UNIV
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