CN102765785A - Device and method for sterilizing and disinfecting wastewater by pulsed liquid-phase discharge plasma - Google Patents

Abstract

The invention discloses a device and a method for sterilizing and disinfecting wastewater by pulsed liquid-phase discharge plasma. The device comprises a pulsed liquid-phase discharge plasma generator and a gas bubbling device, wherein the gas bubbling device is used for bubbling a liquid medium in the device so as to increase generation source matters of free plasma radicals in the liquid medium to enhance the gas-liquid mixing; and the pulsed liquid-phase discharge plasma generator is used for generating active matters of free plasma radicals and transient energy in gas-liquid mixtures. According to the device and method disclosed by the invention, bacteria and viruses in the wastewater are killed by active matters of the free radicals and transient energy generated in the discharge so as to realize efficient treatment of the wastewater; and besides, the wastewater treatment method disclosed by the invention has the advantages of low energy consumption and simple and easy device maintenance.

Description

A kind of apparatus and method of pulse discharge in water plasma sewage sterilization

Technical field

The present invention relates to a kind of apparatus and method of pulse discharge in water plasma sewage sterilization.

Background technology

China's water pollution situation is quite serious at present, and in recent years, nearly 1.64 hundred million tons of trade effluent and sewage quantity discharged every day wherein 80% were handled without strictness and directly to be entered river waters; In the nearly 100,000 kilometers section, 1700 big rivers, the whole nation, nearly 1/2 section is polluted, and 1/10 section is by severe contamination; Urban waters more than 90% is polluted.On the other hand, China is one of country of water resources critical shortage in the world, go to support the people who accounts for the world 20% with the water that accounts for theworld 6%, and the owning amount of tap water per capita of China is merely 1/4 of world average level.Therefore, carry forward vigorously China's purification of water quality, extremely urgent.The key of drinking water safety at first is the control of source of pollution; Wherein the control of the organic pollutant of sewage and waste water and virus killing sterilization etc. becomes key, and country also puts into effect national standards such as " the People's Republic of China's integrated wastewater discharge standard ", " urban wastewater treatment firm pollutant emission standard ", " municipal sewage plant's sewage sludge emission standard " in succession.

The sterilization of sewage generally is last procedure of purification of water quality.WWT sterilization process commonly used has halogen sterilization (like chlorine, dioxide peroxide), oxygenant sterilization (like ozone, Peracetic Acid), radiation sterilization (like ultraviolet ray).In above-mentioned wastewater disinfection technology commonly used, or produce deleterious DBPs, have " three cause " material, can produce the long term toxicity influence human and hydrobiont; Or on-the-spot preparation apparatus is complicated, and investment is big, cost is higher, equipment control complicacy etc.; Then there are problems such as price and high maintenance cost problem, ultraviolet light transmission problem, the equipment power consumption of dirt film problem, the large power long life-span silica tube of photorecombination bacteriological aftergrowth problem, quartz socket tube be bigger in ultraviolet technique.

Summary of the invention

The apparatus and method that the purpose of this invention is to provide a kind of pulse discharge in water plasma sewage sterilization.

The technical scheme that the present invention taked is:

A kind of device of pulse discharge in water plasma sewage sterilization; Comprise pulse discharge in water plasma generator, gas bubbling device; Thereby the liquid medium bubbling that described gas bubbling device is used in device increases the generation source material of plasma body radical in liquid medium, the enhancing gas-liquid mixed; Said pulse discharge in water plasma generator is used for producing plasma body free radical activity material and transient energy at gas-liquid mixture.

Described pulse discharge in water plasma generator comprises discharge power supply and discharge electrode.

Described discharge power supply is the pulse power.

The shape of described discharge electrode comprises right cylinder, spheroid, line-plate.

A kind of method of pulse discharge in water plasma sewage sterilization; May further comprise the steps: thus using gas bubbling device bubbling in liquid medium forms the gas-liquid mixed attitude in liquid medium; Utilize pulse discharge in water plasma generator discharge generation plasma body free radical activity material and transient energy in gas-liquid mixture again, sewage is killed virus and sterilized through utilizing plasma body free radical activity material and transient energy.

The invention has the beneficial effects as follows:

The present invention utilizes the radical and the transient energy that produce in the discharge that bacterium in the sewage and virus are killed, thereby realizes the high-efficiency steriliging of sewage, and the energy that treatment process simultaneously of the present invention consumes is low, and equipment is simple to be safeguarded easily.

Description of drawings

Fig. 1 is the structural representation of device of the present invention.

Embodiment

As shown in Figure 1, a kind of device of pulse discharge in water plasma sewage sterilization comprises water-in 1,discharge power supply 2;Discharge electrode 3,air compressor machine 5,gas bubbling device 6;Ground connection 7,water outlet 4,container 8, wherein,discharge electrode 3 is bylast discharge electrode 31,discharge electrode 32 constitutes down; Spacing betweenlast discharge electrode 31 and the followingdischarge electrode 32 is 0.5 mm, and material is a stainless steel round bar.Air compressor machine 5 is communicated withgas bubbling device 6, andgas bubbling device 6 is arranged on the bottom ofcontainer 8, and it is positioned at the bottom ofdischarge electrode 32 down simultaneously; Discharge electrode is connected withdischarge power supply 2; Discharge power supply adopts the pulse power: 220V (AC), 50Hz, peak impulse voltage 3.7kV.

Pending sewage: specific conductivity is 289 μ s, 98000/L of colibacillus of excrement.

Processed steps is: sewage is from water-in 1 input pod; Sewage quantity in the container reaches a certain amount of (50L is an example); Throughair compressor machine 5 input air (input flow rate is 3L/min) ingas bubbling device 6,bubbling device 6 produces a large amount of bubbles in liquid, open discharge power supply simultaneously; Be betweenlast discharge electrode 31 and the followingdischarge electrode 32 in the liquid and discharge; In gas-liquid mixture, produce radical, the transient energy (comprising the UV-light, the shockwave that produce in the discharge) that combines simultaneously to produce in the discharge process is killed the bacteriophage in the sewage, through the processing of continuous 4min; Colibacillus of excrement is reduced to less than 680/L, and colibacillus of excrement reaches one-level A and goes out water quality standard (GB18918-2002) in the water outlet.The water of accomplishing after handling can be emitted throughwater outlet 4.

Among the present invention, used gas bubbling device is number of patent application and is the microbubble generator described in " 201110165898.4 ".

Claims (5)

1. the device of a pulse discharge in water plasma sewage sterilization; Comprise pulse discharge in water plasma generator, gas bubbling device; It is characterized in that: thus the liquid medium bubbling that described gas bubbling device is used in device increases the generation source material of plasma body radical in liquid medium, the enhancing gas-liquid mixed; Said pulse discharge in water plasma generator is used for producing plasma body free radical activity material and transient energy at gas-liquid mixture.

2. the device of a kind of pulse discharge in water plasma sewage sterilization according to claim 1 is characterized in that: described pulse discharge in water plasma generator comprises discharge power supply and discharge electrode.

3. the device of a kind of pulse discharge in water plasma sewage sterilization according to claim 2, it is characterized in that: described discharge power supply is the pulse power.

4. the device of a kind of pulse discharge in water plasma sewage sterilization according to claim 2, it is characterized in that: the shape of described discharge electrode comprises right cylinder, spheroid, line-plate.

5. the method for a pulse discharge in water plasma sewage sterilization; It is characterized in that: may further comprise the steps: thus use the gas bubbling device bubbling in liquid medium described in the claim 1 in liquid medium, to form the gas-liquid mixed attitude; Utilize the pulse discharge in water plasma generator described in the claim 1 discharge generation plasma body free radical activity material and transient energy in gas-liquid mixture again, sewage is killed virus and sterilized through utilizing plasma body free radical activity material and transient energy.

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