CN102627377B - Method and device for purifying seriously eutrophic river water - Google Patents
Method and device for purifying seriously eutrophic river water Download PDFInfo
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- CN102627377B CN102627377B CN201210113821.7A CN201210113821A CN102627377B CN 102627377 B CN102627377 B CN 102627377B CN 201210113821 A CN201210113821 A CN 201210113821A CN 102627377 B CN102627377 B CN 102627377B
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Abstract
The invention discloses a method for purifying seriously eutrophic river water. The method mainly comprises three steps of electrolyzing, aerating and treating by a membrane bioreactor (MBR). According to the method, the pollution problems of the seriously eutrophic river can be effectively solved, the water quality of the river is improved in shorter time, so that a water ecology system is recovered, and the healthy sustainable development of a river ecology system is achieved. The invention further discloses a device for purifying the seriously eutrophic river water, which is matched with the purification method. The device comprises a dam, an electrolysis machine, an aerating device and a membrane bioreactor. According to the invention, the landscape can be combined and directly installed along the bank of the river, and the environment is hardly changed, so that the influence about the natural environment is less; in addition, the device has a simpler structure and lower production cost, and is suitable for large-scale popularization and application.
Description
Technical field
The present invention relates to ecotechnology process field, refer to especially a kind of refining plant and the purifying method thereof that can effectively process the serious river of eutrophication problem.
Background technology
River system is one of important ecosystem of nature, has the several functions such as water delivery, flood discharge, view, shipping and cultivation.Along with the aggravation of China's industrialization fast, urbanization process and pollution of area source, stream pollution has become serious environmental problem.Because the pollutents such as excessive oxygen consumption organic, nitrogen, phosphorus, toxic substance enter river water, destroy function and the Ecology balance in river, aggravate the shortage of water resources, near resident waters is healthy also compromised.According to " 2010 China Environmental State Bulletin " issued recently, China's surface water pollution is serious.Article 204, in river 409Ge state control section, I to III class, IV to the section ratio of V class and bad V class water quality is respectively 59.9%, 23.7% and 16.4%.The Changjiang river, Zhujiang River overall water quality are good, and Song Hua River, Huaihe River are slight pollution, and the Yellow River, the Liaohe River are intermediate pollution, and Haihe River is serious pollution.Lake (reservoir) eutrophication problem is still outstanding, in 26 lakes (reservoir) of monitoring nutritional status, eutrophic state account for 42.3%.
Body eutrophication refers under the impact of mankind's activity, enter in a large number the unhurried current water bodys such as lake, reservoir, river and bay for the required nutritive substance such as nitrogen, phosphorus of biology, cause that algae and other hydrobionts breed rapidly, Dissolved Oxygen in Water declines, water quality stench, the phenomenon of fish and other biological mortality.
In recent years, along with the mankind are increasingly sharpened to the exploitation activity of environmental resources, " urbanization " phenomenon that since particularly the mankind entered for 20th century, industrialization brings, concentrate on the particular locality of some abundant water, the trade effluent and the sanitary sewage that contain in a large number the nutritive substance such as nitrogen, phosphorus are discharged into neighbouring lake, river and reservoir, have increased the lifting capacity of the nutritive substance of these water bodys.Meanwhile, because agriculture production improves the needs of crop yield, the increase year by year of chemical fertilizer and pesticide dosage, the nutritive substances that do not absorbed by farm crop are in a large number through rain drop erosion and infiltrations, finally run off and are transported in water body.In addition the bait of throwing in the excrement of animals in livestock industry and culture fishery, also becomes the main channel of the nutritive substances such as water body receiving nitrogen, phosphorus.The impact of all these human factors, makes water body be developed to eutrophy by poor nutrition.
In eutrophication water, a large amount of algae that growing taking blue-green algae, green alga as sociales.These algaes form the green scum silica frost of one deck on the water surface, greatly reduce the transparency in river, and the colourity in river increase water quality also becomes muddy, thereby the sense organ in river is declined.Meanwhile, having part algae can distribute fishy smell foreign odor has directly affected daily life, and makes water taste unpleasant, has reduced water quality.Some algae can also secrete, discharge these materials of virose material and enter after water body, causes alimentary canal inflammation if drunk membership by livestock or people, harmful people and animals' health.In addition, the contaminated performance characteristic in eutrophication river is-black smelly, mainly that people is that a large number of nutrients enrichment in water body entering causes, a large amount of pollutant sediments forms mud, pollutent in water body has consumed the dissolved oxygen of water body, a large amount of aerobe death, anaerobion population is very active, finally makes eutrophication river lose self-purification capacity.The influence factor in eutrophication river is numerous, and difficulty of governance is larger, has become a great problem of influence ecological environment.
The method of purifying eutrophic water quality of river is subject to flow at present, pollutent, biophase, substrate, the multifactorial impact restriction such as envrionment conditions, and purification process all has certain scope of application, therefore in actual engineering, need to consider as a whole, reasonable disposition is to improve overall decontamination effect improving, compare with developed country, the purification reparation in China river is started late, mainly lay particular emphasis on water correction, under this background, be main body by biology in situ recovery technique, in conjunction with aeration, bank band is repaired, the corresponding technologies such as species diversity reply, but the purification cycle of aforesaid method is long and effect is not good enough.
Summary of the invention
The invention provides that a kind of process costs is low, the strong adaptability to water quality, river water cleaning method and refining plant thereof that lasting effect is good, its object is to overcome the defect that purification cycle is long, effect is not good enough that prior art exists, the improvement of serious rice-nutrient water quality of river, Ecology system are recovered, realized the sustainable health development of river ecosystem.
Technical scheme of the present invention is as follows:
Serious rice-nutrient river water cleaning method, comprise the following steps: first river is intercepted into upper, middle and lower trip part, then the water of upstream portion is sent into electrolysis in electrolysis machine, again the water after electrolysis is sent into middle reaches part and carry out Air Exposure, and then the water after aeration is sent into membrane bioreactor (MBR) and process, finally the water after Membrane Bioreactor for Wastewater Treatment is entered to downstream part.
As improvement of the present invention, described electrolysis machine is nano-catalytic electrolysis machine, and it is the titanium-base anode of the coating of metal oxides of 10-35nm that its anode adopts surface coverage to have crystal grain; Its negative electrode is the one in titanium negative electrode, iron cathode, aluminium negative electrode, stainless steel cathode, zinc negative electrode, cathode, nickel cathode, lead electrode or graphite cathode.
As a further improvement on the present invention, the operating voltage between described anode and negative electrode is 2～8V, and current density is 10～320mA/cm
2.
Serious rice-nutrient river water cleaning device, comprise two dams river being intercepted into upper, middle and lower trip part, it also comprises electrolysis machine, aerating apparatus and membrane bioreactor and is installed on river alongshore in conjunction with view, and the water-in of described electrolysis machine and water outlet are connected to upstream portion and middle reaches part; The aeration tube of described aerating apparatus is evenly embedded in middle reaches part; The water-in of described membrane bioreactor and water outlet are connected to middle reaches part and downstream part.
Described electrolysis machine is nano-catalytic electrolysis machine, and it is the titanium-base anode of the coating of metal oxides of 10-35nm that its anode adopts surface coverage to have crystal grain; Its negative electrode is the one in titanium negative electrode, iron cathode, aluminium negative electrode, stainless steel cathode, zinc negative electrode, cathode, nickel cathode, lead electrode or graphite cathode.
Operating voltage between described anode and negative electrode is 2～8V, and current density is 10～320mA/cm
2.
Described membrane bioreactor (MBR) is provided with stopping valve, membrane bioreactor membrane cisterna, gas blower, aerator, ultrafiltration membrane system, suction pump and dialyzate (water) basin.Nano-catalytic electrolysis machine gained water enters membrane bioreactor (MBR) membrane cisterna by water inlet pipe and stopping valve.Ultra-filtration membrane is immersed in the water of membrane cisterna, and suction pump is crossed membranous wall from ultra-filtration membrane inner side by water negative pressure-pumping, and the dialyzate (water) of generation is collected dialyzate (water) by suction pump and flowed in river.The outlet of rice catalytic electrolysis machine is received in the import of stopping valve, and the outlet of stopping valve connects the import of membrane bioreactor (MBR), and the outlet of membrane bioreactor (MBR) is successively through suction pump, stopping valve access water port.
Described dam is rubber dam or concrete dam.
Compared to the prior art, the invention has the advantages that:
1, can make the macrocylc compound open loop in serious rice-nutrient river by electrolysis, long-chain chain rupture, the radical oxygenolysis organism of generation, fast reducing COD; Inorganic Ammonium in oxygenolysis water, the decreasing ratio of ammonia nitrogen can reach 80～90%, and reduces total nitrogen index, eliminates stink in water simultaneously; Significantly reduce the colourity of serious rice-nutrient river, the strong oxidizing property free radical such as chlorine [Cl], hydroxyl [OH] and oxygen [O] that electrolysis produces can oxygenolysis water in chromophoric group, auxochrome group, reduction colourity, reaches the object of decolouring; Deodorizing, the osmophore in multiple radical (chlorine [Cl], hydroxyl [OH] and oxygen [O]) the oxygenolysis river that electrolysis produces, removes the stench in water; Except algae, in electrolytic process, can produce the free radical in a large number with strong oxidizing property, can decompose the cell walls of algae by Quick Oxidation, destroy the cellularstructure of algae, the DNA replication dna of blocking-up algae, suppresses algal grown in water.
2, Air Exposure is carried out in the water outlet after electrolysis, can increase dissolved oxygen content in water body, the metabolism that makes aerobic microbiological pass through self becomes simple inorganics the organic pollutant degradation in water, reduce COD, play the effect of self purification of water body, can also strengthen the mobility of water body, thereby reach desirable decontamination effect improving.In addition, can further remove the pollutent in water and reach desirable decontamination effect improving by Membrane Bioreactor for Wastewater Treatment.
3, refining plant of the present invention can directly be installed on river alongshore direct purification river, does not need specially river to be caused in predetermined structures and processed, and environment is changed, and therefore its impact on physical environment is less.
4, adopt nano-catalytic electrolysis machine to there is following outstanding effect, by being covered in the electrocatalysis of nano coating on anode top layer, reduce the overpotential of electrolysis, thereby make water electrolysis under lower voltage conditions, produce the hydrogen of oxygen, hydroxyl, chlorine and the status nascendi of status nascendi, effectively kill bacterium, algae and planktonic organism in water, the pollution index such as total nitrogen in fast reducing water, total phosphorus, COD, colourity, turbidity, stink, purifies water.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the schematic diagram of membrane bioreactor (MBR).
Embodiment
The specific embodiment of the present invention is described with reference to the accompanying drawings.
With reference to Fig. 1, with reference to Fig. 2, serious rice-nutrient river water cleaning device, comprises rubber dam 1 and rubber dam 2, and rubber dam 1 intercepts into upstream portion 6, middle reaches part 7 and downstream part 8 with rubber dam 2 by river.Above-mentioned refining plant also comprises water pump 31, nano-catalytic electrolysis machine 3; Aerating apparatus 4, aeration tube 41; Membrane bioreactor (MBR) 5 also comprises intake pump 51, stopping valve 52, membrane bioreactor membrane cisterna 53, gas blower 54, aerator 55, hyperfiltration membrane assembly 56, suction pump 57 and dialyzate outlet 58.Water after aeration enters membrane bioreactor (MBR) membrane cisterna 53 by intake pump 51 and stopping valve 52.Hyperfiltration membrane assembly 56 is immersed in the water of membrane bioreactor membrane cisterna 53, and suction pump 57 is crossed membranous wall from ultra-filtration membrane 56 inner sides by water negative pressure-pumping, and the dialyzate (water) of generation is collected dialyzate outlet 58 by suction pump and flowed in river.
Above-mentioned nano-catalytic electrolysis machine 3, aerating apparatus 4 and membrane bioreactor 5 are positioned over bank conventionally, and the aeration tube 41(of aerating apparatus 4 is generally water distributor) be uniformly distributed in middle reaches part 7.Water pump 31 is serially connected nano-catalytic electrolysis machine 3 and upstream portion 6 by pipeline, water after 3 electrolysis of nano-catalytic electrolysis machine flows into middle reaches part 7 aerations again, water after aeration is pumped in membrane bioreactor 5 and is processed by water pump 51 again, finally water after treatment is entered in downstream part 8 again.
It is the titanium-base anode of the coating of metal oxides of 10-35nm that the anode of above-mentioned nano-catalytic electrolysis machine 3 adopts surface coverage to have crystal grain; Its negative electrode is that titanium negative electrode is (certain, negative electrode also can be substituted by iron cathode, aluminium negative electrode, stainless steel cathode, zinc negative electrode, cathode, nickel cathode, lead electrode or graphite cathode), when use, conventionally the operating voltage between anode and negative electrode need to be controlled between 2～8V, current density is controlled at 10～320mA/cm
2between.Its specific operation process is as follows: first with rubber dam 2, upper, middle and lower trip part 6,7,8 is intercepted into in river with rubber dam 1, then by water pump 31 by electrolysis in the river suction nano-catalytic electrolysis machine 3 of upstream portion 6 (certainly, it also can be sent into the river of upstream portion 6 in nano-catalytic electrolysis machine 3 by other instruments), after electrolysis fully, flow into again the interior aeration of middle reaches part 7, and then make the water after aeration pump in membrane bioreactor 5 and process by water pump 51, finally the water after purifying is entered to downstream part 8.Part 6,8 water quality situations in upstream and downstream are in table 1 and table 2.
The water quality of table 1 upstream portion
| Sequence number | Project | Measured value | Sequence number | Project | Measured value |
| 1 | Smelly and taste | There is odor smell | 6 | Chlorophyll a (mg/L) | 0.64 |
| 2 | Total phosphorus (mg/L) | 0.9 | 7 | Transparency (m)≤ | 1.5 |
| 3 | Total nitrogen (mg/L) | 13.8 | 8 | Algae (individual/L) | 7.0×10 8 |
| 4 | Opacity (NTU) | 15 | 9 | Total plate count (individual/L) | 4.8×10 8 |
| 5 | COD Cr（mg/L） | 50 | 10 | Colourity (doubly) | 20 |
The water quality of table 2 downstream part
| Sequence number | Project | Measured value | Sequence number | Project | Measured value |
| 1 | Smelly and taste | Without odor smell | 6 | Chlorophyll a (mg/L) | 0.004 |
| 2 | Total phosphorus (mg/L) | 0.05 | 7 | Transparency (m) >= | 4 |
| 3 | Total nitrogen (mg/L) | 0.1 | 8 | Algae (individual/L)≤ | 3.6×10 3 |
| 4 | Opacity (NTU)≤ | 3 | 9 | Total plate count (individual/L)≤ | 1.5×10 3 |
| 5 | COD Cr（mg/L） | 12 | 10 | Colourity (doubly) | 3 |
Contrast table 1 and table 2 be not difficult to find, the quality of river water of downstream part 8 has had comparatively significantly and to improve, and not only opacity significantly reduces, and there is no stink, and total nitrogen, total phosphorus, COD, colourity, algea and bacteria quantity all reduce significantly.
Adopt nano-catalytic electrolysis machine 3 to there is following outstanding effect, by being covered in the electrocatalysis of nano coating on anode top layer, reduce the overpotential of electrolysis, thereby make water electrolysis under lower voltage conditions, produce the hydrogen of oxygen, hydroxyl, chlorine and the status nascendi of status nascendi, effectively kill bacterium, algae and planktonic organism in water, the pollution index such as total nitrogen in fast reducing water, total phosphorus, COD, colourity, turbidity, stink, purifies water.
In addition, in practical application, can determine according to the actual flow in river the quantity of refining plant.
Above are only the embodiment of invention, but design concept of the present invention is not limited to this, allly utilizes this design to carry out the change of unsubstantiality to the present invention, all should belong to the behavior of invading protection domain of the present invention.
Claims (6)
1. serious rice-nutrient river water cleaning method, is characterized in that, comprises the following steps: first river is intercepted into upper, middle and lower trip part; Then the water of upstream portion is sent into electrolysis in nano-catalytic electrolysis machine, it is the titanium-base anode of the coating of metal oxides of 10-35nm that the anode of described nano-catalytic electrolysis machine adopts surface coverage to have crystal grain, negative electrode is the one in titanium negative electrode, iron cathode, aluminium negative electrode, stainless steel cathode, zinc negative electrode, cathode, nickel cathode, lead electrode or graphite cathode, operating voltage between described anode and negative electrode is 2～8V, and current density is 10～320mA/cm
2; Again the water after electrolysis is sent into middle reaches part and carry out Air Exposure, and then the water after aeration is sent into Membrane Bioreactor for Wastewater Treatment, finally the water after Membrane Bioreactor for Wastewater Treatment is entered to downstream part.
2. serious rice-nutrient river water cleaning method as claimed in claim 1, is characterized in that: the working conditions of described membrane bioreactor is pressure-1 ~-50kPa, and the cycle of operation is 10 minutes, wherein, aspirates empty aeration 1 ~ 2 minute 8 ~ 9 minutes.
3. serious rice-nutrient river water cleaning device, comprise river is intercepted into, in, two dams of downstream part, it is characterized in that: it also comprises nano-catalytic electrolysis machine, aerating apparatus and membrane bioreactor are also installed on river alongshore in conjunction with view, it is the titanium-base anode of the coating of metal oxides of 10-35nm that the anode of described nano-catalytic electrolysis machine adopts surface coverage to have crystal grain, negative electrode is titanium negative electrode, iron cathode, aluminium negative electrode, stainless steel cathode, zinc negative electrode, cathode, nickel cathode, one in lead electrode or graphite cathode, the water-in of described nano-catalytic electrolysis machine and water outlet are connected to upstream portion and middle reaches part, the aeration tube of described aerating apparatus is evenly embedded in middle reaches part, the water-in of described membrane bioreactor and water outlet are connected to middle reaches part and downstream part.
4. serious rice-nutrient river water cleaning device as claimed in claim 3, is characterized in that: the operating voltage between described anode and negative electrode is 2～8V, current density is 10～320mA/cm
2.
5. serious rice-nutrient river water cleaning device as claimed in claim 3, it is characterized in that: described membrane bioreactor is provided with stopping valve, membrane bioreactor membrane cisterna, gas blower, aerator, hyperfiltration membrane assembly, suction pump and dialyzate basin, aeration gained water enters membrane bioreactor membrane cisterna by intake pump and stopping valve, hyperfiltration membrane assembly is immersed in the water of membrane cisterna, suction pump is crossed membranous wall from ultra-filtration membrane inner side by water negative pressure-pumping, and the dialyzate of generation is collected dialyzate outlet by suction pump and flowed in river.
6. serious rice-nutrient river water cleaning device as claimed in claim 3, is characterized in that: described dam is rubber dam or concrete dam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210113821.7A CN102627377B (en) | 2012-04-18 | 2012-04-18 | Method and device for purifying seriously eutrophic river water |
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| CN201210113821.7A CN102627377B (en) | 2012-04-18 | 2012-04-18 | Method and device for purifying seriously eutrophic river water |
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| CN102627377A CN102627377A (en) | 2012-08-08 |
| CN102627377B true CN102627377B (en) | 2014-08-06 |
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| CN105923926A (en) * | 2016-06-28 | 2016-09-07 | 尚川（北京）水务有限公司 | Black and odorous sewage treatment system and black and odorous sewage treatment technology |
| CN112830623B (en) * | 2019-11-25 | 2022-06-07 | 福建杰达环保科技有限公司 | Black and odorous water body treatment device and treatment method |
| CN113640490B (en) * | 2021-10-18 | 2022-01-28 | 四川省水利科学研究院 | River and lake water ecological environment monitoring device, system and method based on Internet of things |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562826A (en) * | 2004-04-05 | 2005-01-12 | 甄建伟 | River way type sewage treatment system |
| CN2848828Y (en) * | 2005-12-19 | 2006-12-20 | 许水源 | Installation for treating city black foul river |
| CN102010038A (en) * | 2010-12-30 | 2011-04-13 | 波鹰(厦门)科技有限公司 | Nano catalytic electrolysis flocculation device |
| CN202625980U (en) * | 2012-04-18 | 2012-12-26 | 波鹰(厦门)科技有限公司 | Device for purifying river water subjected to severe eutrophication |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432533A (en) * | 2002-01-16 | 2003-07-30 | 陈丹 | Algae killing and inhibiting method for water body |
| CN1552641A (en) * | 2003-06-06 | 2004-12-08 | 中国科学技术大学 | System and method for treating runway pollution by aquatic floating plant |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562826A (en) * | 2004-04-05 | 2005-01-12 | 甄建伟 | River way type sewage treatment system |
| CN2848828Y (en) * | 2005-12-19 | 2006-12-20 | 许水源 | Installation for treating city black foul river |
| CN102010038A (en) * | 2010-12-30 | 2011-04-13 | 波鹰(厦门)科技有限公司 | Nano catalytic electrolysis flocculation device |
| CN202625980U (en) * | 2012-04-18 | 2012-12-26 | 波鹰(厦门)科技有限公司 | Device for purifying river water subjected to severe eutrophication |
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