CN102745832B - Method for treating town sewage into water for ecological landscape - Google Patents
Method for treating town sewage into water for ecological landscape Download PDFInfo
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- CN102745832B CN102745832B CN201110097512.0A CN201110097512A CN102745832B CN 102745832 B CN102745832 B CN 102745832B CN 201110097512 A CN201110097512 A CN 201110097512A CN 102745832 B CN102745832 B CN 102745832B
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Abstract
The invention discloses a method for treating town sewage into water for an ecological landscape. The method comprises the following steps of orderly carrying out ozone treatment and filtration treatment on water discharged by a town sewage plant, wherein in ozone treatment, residual organics in the water discharged by the town sewage plant is decomposed by ozone and in filtration treatment, suspended matters in the water are further removed by filtration. The method can reduce chroma and turbidity of sewage, reduce organic pollutants of ozone oxidized water to a certain degree and improve ecological safety. The method has simple and economic processes, can effectively perform advantages of an ozone technology, can remove chroma, a small and residual organics of water discharged by a town sewage plant, can effectively eliminate toxic effects of ozone oxidized water on embryo development, can reduce an aberration rate of embryo development, and is a safe and effective sewage recycling treatment method. Water treated by the method can be used as water for an ecological landscape.
Description
Technical field
The present invention relates to a kind of regeneration treating method of town sewage plant effluent, particularly adopt the method that the ozonize technique combined with filtration processes municipal effluent plant effluent.
Background technology
Along with the fast development of Chinese society economy and the quickening of urbanization process, urban water shortage and problem of environmental pollution are particularly outstanding, and water resources has become the important factor of restriction socio-economic development.Municipal effluent and urban water supply are almost suitable, and having water yield abundance, the features such as water conditioning, is a kind of potential water resources, and the regeneration of municipal effluent is one of effective way solving current water resources worsening shortages.
At present; ozonize method has been widely used in municipal sewage treatment; because ozone is a kind of strong oxidizer, have very strong sterilization, sterilization, taste removal, discolor, the characteristic of degradation of organic substances, the organism in itself and sewage reacts and organic matter molecular mass usually can be made to diminish; aromaticity disappears; polarity strengthens, and biodegradability improves, and more oxidized organism generates oxygen G&W under ozonization; can be the oxygenation of subsequent biological treatment technique, be conducive to the growth of aerobic microbiological.
Although ozonize method has a lot of advantages, but it is low to there is ozone utilization rate, oxidation capacity is not enough, oxidative degradation is difficult to for segmental stability organic pollutant, the structural change of parent compound is only confined to some organic degradeds, likely can produces the defects such as the intermediate oxidation product that toxicity degrades more greatly or more not easily.Research shows Japanese medaka (Japanese medaka (d-rR)) fish-egg to be exposed in the municipal effluent secondary effluent after by the ozone oxidation of doses, create disadvantageous effect to medaka fetal development, abnormal rate obviously raises; Rainbow trout embryo to be exposed to after ozone oxidation in secondary effluent, to have found the phenomenon of rainbow trout impaired development; When adopting ozonize method to process the sewage containing humic acid, algae, fulvic acid etc., in process water outlet, the content of haloform can obviously increase, and haloform has carcinogenic, aberration inducing, to mutation effect, human body generation can be made acute and chronic poisoning; When ozonize is carried out to the sewage containing bromine water, the bromate etc. with carcinogenesis can be generated.
The conventional pollution index that the existing reusing sewage water quality standard of China limits can not microscale harmful substance and pathogenic micro-organism cause in reuse process in actual response water potential security risk.Along with increasing novel micro noxious pollutant detects gradually in sewage, the potential information requirement of reusing sewage is gradually by people are paid close attention to.
Such as publication number is that the Chinese invention patent application of CN101602562A discloses a kind of high-safety regenerated water advanced treatment process, first carry out ozone Oxidation Treatment to the secondary effluent of municipal sewage plant, the macromole organic pollutant of difficult degradation in sewage is oxidized to, and structure is simple, the small organic molecule of readily biodegradable; Small molecules organic matter flows into biological filter with sewage subsequently, is removed by the microbiological deterioration in biologic packing material; Treated sewage finally flows in ultraviolet disinfecting reactor and carries out deactivation, eliminates microorganism residual in sewage.The method is the biological genetic toxicity that the technique adopting ozone Oxidation Treatment and biological degradation process to combine removes secondary effluent, improves the security of process water outlet.
And for example notification number is that the Chinese invention patent of CN1796314A discloses a kind of city sewage deep treatment method, adopt coagulation and filtration, ozone oxidation, bio-oxidation, advanced treatment is carried out to municipal effluent, to remove difficult degradation micro-content organism, bacterium, virus etc. remaining in municipal effluent secondary effluent, decolouring, except smelling, reaches the object of safe reuse.The ozonize that remains that the method adopts carries out advanced treatment in conjunction with the method for bio-oxidation process to municipal effluent, thus improves the security of reuse water.
The method of the ecological security after above-mentioned raising municipal effluent ozonize all needs to adopt bio-oxidation process, although the safety performance of the reuse water after process improves, but complex treatment process, the sewage disposal time is long, the higher and running maintenance relative complex of filter material for biological filter relative price.In addition, biological filter advantage not obvious in reduction reuse water turbidity.
Summary of the invention
The object of the invention is to provide for above-mentioned prior art Problems existing that one is more simple, economical, safe and effective sewage water treatment method, this treatment process not only can remove organic pollutant, colourity, turbidity in sewage effluents effectively, eliminate the toxic action that ozone Oxidation Treatment water outlet causes biological fetal development, reduce the abnormal rate of biological fetal development, and the treatment time is short, processing efficiency is high, water outlet after process can be used as landscape water, and security is high.
For realizing object of the present invention, it is the water treatment method of ecological landscape water by urban wastewater treatment that one aspect of the present invention provides a kind of, carries out ozonize and filtration treatment successively to the secondary effluent of municipal sewage plant.
Wherein, in described ozone treating process, the consumption of ozone gas is 0.1-10mg O
3/ mg DOC (ozone amount that namely in waste water, every milligram of dissolved organic carbon adds is 0.1-10mg), is preferably 0.3-0.5mg O
3/ mg DOC.
Particularly, in described ozone treating process, hydraulic detention time is 12-20 minute, is preferably 15-18 minute.
Wherein, described ozonize is that the secondary effluent of municipal sewage plant is entered ozone reaction device from top, and ozone gas enters from bottom, and gas, water adverse current carry out ozone oxidation reaction, obtained ozonize water outlet.
Particularly, ozone gas also carries out gas distribution through aerating apparatus after entering ozone reaction device bottom, and ozone gas is uniformly distributed, and wherein, the aperture of described aerating apparatus is 30-50 micron.
Wherein, the filtration unit having loaded filtration medium is flow through in the water outlet that described filtration treatment is through ozonize with the flow velocity of 4-9m/h.
Particularly, described flow velocity is preferably 5-8m/h, more preferably 5-6.5m/h.
Wherein, described filtration medium be chosen as that price is relatively cheap, the relatively simple quartz sand of running maintenance.
Particularly, the diameter of described quartz sand is 0.8-1.25mm.
Wherein, in filtration unit, the height of filtration medium is 1.2-1.6m; Hydraulic detention time is 15-20 minute.
The present invention provides a kind of ecoscape water prepared according to the method described above on the other hand.
The inventive method tool has the following advantages:
1, the organic contamination substrate concentration in the ecoscape water prepared of the inventive method, colourity, turbidity significantly reduce, COD
mnreduce 41-44%, colourity reduces 68-81%, and turbidity reduces 90-96%.
2, the security of ecoscape water prepared of the inventive method is high, and bio-toxicity significantly reduces, and effectively eliminates the toxic action that the water outlet of ozone oxidation degradation treatment causes biological fetal development, reduces the abnormal rate of biological fetal development.The Japanese medaka juvenile fish abnormal rate be exposed in the ecoscape water that the present invention produces is reduced to less than 5%, and rate of embryonic death is reduced to less than 9%.
3, the inventive method technological operation is simple, only comprises ozonize and simple filtration treatment, reused water processing time shorten, reduces the cost of the process of municipal effluent secondary effluent, improve reused water processing efficiency.
4, quartz sand filter media of the present invention, the effect that after not only having the control ozone of biological activated carbon, Biohaydite filter material, fish-egg toxicity raises, also have the efficient turbidity removal function not available for other filtrate, in addition, also overcome the problem that filtrate price in biofiltration is high, run complexity.
Accompanying drawing explanation
The process flow sheet of Fig. 1 to be the present invention by urban wastewater treatment be water treatment method of ecological landscape water.
Specific embodiment mode
The former water of handling object of the present invention is the secondary effluent taking from urban wastewater treatment firm, and the water quality of former water is: COD
mnfor 7.5-8.7mg/L, DOC (dissolved organic carbon) are 6.9-7.1mg/L, NH
4 +-N is 0.8-1.0mg/L, UV
254for 0.141-0.184L/cm, colourity is 25-27 degree, and turbidity is 5.4-7.1NTU, and pH value is 7.8-7.9.
Town sewage reuse of the present invention be the technical process of the treatment process of ecological landscape water as shown in Figure 1, the secondary effluent of urban wastewater treatment firm is carried out ozonize and filtration treatment successively and be get final product.
One, ozone Oxidation Treatment
The secondary effluent of urban wastewater treatment firm enters ozone contact reaction device from top, ozone gas enters from the bottom of ozone contact reaction device, after being arranged on the even gas distribution of the aerating apparatus in ozone contact reaction device, fully contact with the secondary effluent flowed into from ozone contact reaction device top, gas, water adverse current carry out ozone Oxidation Treatment, the ozonize water outlet obtained is flowed out from reactor lower part, wherein, the aperture of the aerating apparatus in ozone contact reaction device is 30-50 micron, and ozone intake pressure is 0.1-0.15MPa; The consumption of ozone is 0.1-10mg O
3/ mgDOC, the ozone amount that namely in waste water, every milligram of dissolved organic carbon adds is 0.1-10mg, and hydraulic detention time is 12-20 minute.
Two, filtration treatment
Ozonize water outlet is from the top inflow filter of strainer, in strainer, organism in ozonize water outlet and impurity are removed in the filtration of filler, flowing out from strainer bottom for water reuse in landscape water after process, wherein, filler in strainer is quartz sand, and the flow velocity of ozonize water outlet is 4-9m/h; Hydraulic detention time is 15-20 minute, bed stuffing height 1.2-1.6m.
Embodiment 1
The municipal effluent that the present embodiment 1 processes takes from the secondary effluent of sewage work of Beijing, and secondary effluent (namely processing former water) water-quality guideline is in table 1.
1, ozonize:
Ozone gas is under the effect of ozone machine, enter in ozone contact reaction device by pipeline from bottom, through the even gas distribution of aerating apparatus, the secondary effluent counter current contact of ozone gas and the municipal sewage plant to enter from ozone contact reaction device top, there is oxidative degradation, kill the microorganism in secondary effluent, and become structure relatively simple the macromole organic pollutant oxidative degradation being difficult in secondary effluent degrade, easily by small organic molecule that microorganism utilizes, ozonize water outlet is flowed out bottom ozone contact reaction device, wherein, aerating apparatus aperture is 30 microns, ozone intake pressure is 0.1Mpa, ozone dosage is 0.3mg O
3/ mg DOC, the ozone amount that namely in waste water, every milligram of dissolved organic carbon adds is 0.3mg, and secondary effluent (namely the processing former water) hydraulic detention time in ozone contact reaction device is 15 minutes, and the water-quality guideline of ozonize water outlet is in table 1,
2, filtration treatment:
Quartz sand filter media is filled in strainer, loading height is 1.5m, ozonize water outlet is from the top inflow filter of strainer, filler quartz sand is flow through with the flow velocity of 5m/h, carry out filtration treatment, wherein, the diameter of quartz sand is 0.8-1.25mm, and the water-quality guideline of filtration treatment water outlet is in table 1.
According to " water and waste water determination method (the 4th edition) " that State Environmental Protection Administration 2002 publishes, detect the COD of the secondary effluent (processing former water) of municipal sewage plant, ozonize water outlet and filtration treatment water outlet
mn, DOC, NH
4 +-N, UV
254, pH, colourity, turbidity value.
Embodiment 2
The municipal effluent that the present embodiment 2 processes takes from the secondary effluent of Tianjin sewage work, and secondary effluent (namely processing former water) water-quality guideline is in table 1.
Except aerating apparatus aperture is 50 microns in ozone treating process, ozone intake pressure is 0.15Mpa, and ozone dosage is 0.5mg O
3/ mg DOC, the hydraulic detention time of secondary effluent in ozone contact reaction device is outside 17 minutes, and all the other are identical with embodiment 1, and the water-quality guideline of obtained ozonize water outlet is in table 1;
In filter process, the loading height except filtration medium quartz sand is 1.5m, and the flow velocity of ozonize water outlet is outside 6m/h, and all the other are identical with embodiment 1, and the water-quality guideline of filtration treatment water outlet is in table 1.
Embodiment 3
The municipal effluent that the present embodiment 3 processes takes from the secondary effluent of Tianjin B sewage work, and secondary effluent (namely processing former water) water-quality guideline is in table 1.
In ozone treating process, except aerating apparatus aperture is 40 microns, ozone intake pressure is 0.12Mpa, and ozone dosage is 0.4mg O
3/ mg DOC, the hydraulic detention time of secondary effluent in ozone contact reaction device is outside 16 minutes, and all the other are identical with embodiment 1, and the water-quality guideline of obtained ozonize water outlet is in table 1;
In filter process, processing the filler used is quartz sand, and the diameter of quartz sand is 0.8 ~ 1.25mm, and the flow velocity of ozonize water outlet is outside 6.5m/h, and all the other are identical with embodiment 1, and the water-quality guideline of filtration treatment water outlet is in table 1.
The water-quality guideline detected result of the former water of table 1, ozonize water outlet and water outlet of carrying out a biological disposal upon
Check result from table 1: the secondary effluent after urban wastewater treatment is after ozonize of the present invention and filtration treatment, and the organic pollutant in secondary effluent, colourity and turbidity all have remarkable reduction, wherein COD
mnreduce 41-44%, colourity reduces 68-81%, and turbidity reduces 90-96%.
The medaka fish-egg exposure test of test example Japan
Japan's medaka (d-rR) comes from Japan Nagoya university Bio-Centers, and this fingerling lay eggs is attached to raun buttocks by egg membrane silk, easily collects, the fish-egg collected point or dropper it is separately for subsequent use.
(Jin Miao is looked into according to reference, prince is good for the urgency that .2005. utilizes the draining of Japanese blue or green Medaka early development stage exposure assessment, chronic toxicity and endocrine disrupting [J]. ACTA Scientiae Circumstantiae, 25 (12): 1682-1686) method, collection is attached to the fertilized fish roe of Japanese medaka (d-rR) raun afterbody, and the fish-egg within fertilization 4 hours is carried out exposure test.Concrete testing sequence is as follows:
Random choose 200 pieces of successful fertilization fish-eggs, 20 pieces is one group, be divided into into 10 groups, ozonize water outlet group, the former water group of embodiment 1-3, medaka breeding water group in finished product water (the i.e. filtration treatment water outlet) group that namely embodiment 1-3 is obtained, embodiment 1-3.
Ozonize water outlet in the finished product water (i.e. filtration treatment water outlet) that test water: embodiment 1-3 obtains, embodiment 1-3, the former water group of embodiment 1-3, medaka breeding water (control group).
24 orifice plate (Costar are transferred to by often organizing fertilized fish roe
ruSA) in 20 apertures in, the each self-corresponding test water of 2.5mL is added in each hole often organized, then orifice plate is placed in 24-26 DEG C, light application ratio is expose in the environment in 16h: 8h (daytime: night), every 24h changes single test water, until all fish-eggs that can hatch all are hatched;
Platform Stereo microscope (Germany, LEICAMZ 16F) is adopted to observe fish-egg exposure every day, when occurring that egg nucleus condense, chorion breakage, capsule liquid the embryonic death phenomenon such as to expose constantly, is defined as dead embryo; When the normal juvenile fish of build hatches, be defined as juvenile fish and hatch; Shaking off chorion when occurring that juvenile fish is unable, hatching juvenile fish afterbody and bending, during the enlargement of juvenile fish belly etc. during abnormal phenomenon, being defined as lopsided juvenile fish; Record the dead embryo number of Japanese medaka, hatch juvenile fish number and lopsided juvenile fish number, calculate juvenile fish abnormal rate, rate of embryonic death, the results are shown in Table 2; Wherein, rate of embryonic death is the ratio that dead embryo accounts for total fish-egg; Juvenile fish abnormal rate is that lopsided juvenile fish accounts for the ratio of always always hatching fish-egg.
Table 2 fish-egg exposure test result
From table 2 test-results:
1, the secondary effluent of municipal sewage plant is after ozonize, and process water outlet makes medaka juvenile fish abnormal rate rise, and illustrates that ozonize water outlet may cause certain toxic action to biological fetal development, the probability of biological teratogenesis is raised;
2, the water outlet after the inventive method process can eliminate the problem of the juvenile fish abnormal rate rising caused because of ozonize effectively, water outlet after ozonize is after filtration treatment, medaka juvenile fish abnormal rate is reduced to less than 5%, rate of embryonic death is reduced to less than 9%, reach 5-9%, show the security of process water outlet to be improved the teratogenesis problem that filtering subsequent process of the present invention effectively can be eliminated ozonize and produces widely.
Claims (10)
1. be a water treatment method for ecological landscape water by urban wastewater treatment, comprise:
Secondary effluent is obtained from municipal sewage plant;
By by ozone gas and described secondary effluent counter current contact, realize the ozonize to secondary effluent, to kill the microorganism in secondary effluent;
Secondary effluent through ozonize is carried out filtration treatment, and obtain described ecoscape water, it is characterized in that, described ozonize comprises:
Detect the content of DOC in secondary effluent;
According to the content determination ozone usage of the DOC of detected secondary effluent;
According to determined ozone usage, by described ozone gas and described secondary effluent counter current contact,
Wherein, the water-quality guideline of secondary effluent is:
The mass ratio that the DOC of determined ozone usage and secondary effluent measures is 0.1-10:1, thus the toxic action that the water outlet of elimination ozone oxidation degradation treatment causes biological fetal development, reduce the abnormal rate of biological fetal development.
2. water treatment method as claimed in claim 1, is characterized in that the content of DOC in described secondary effluent is 6.9-7.1mg/L.
3. water treatment method as claimed in claim 2, is characterized in that at the consumption of described ozone gas be 0.3-0.5mgO
3/ mg DOC.
4. water treatment method as claimed in claim 1 or 2, is characterized in that hydraulic detention time is 12-20 minute in described ozone treating process.
5. water treatment method as claimed in claim 4, is characterized in that hydraulic detention time is 15-18 minute in described ozone treating process.
6. the water treatment method as described in as arbitrary in claim 1-3, it is characterized in that described ozonize is that the secondary effluent of municipal sewage plant is entered ozone reactor from top, ozone gas enters from bottom, and gas, water adverse current carry out ozone oxidation DeR, obtained ozonize water outlet.
7. water treatment method as claimed in claim 1, is characterized in that the filtration unit having loaded filtration medium is flow through in the water outlet that described filtration treatment is through ozonize with the flow velocity of 4-9m/h.
8. water treatment method as claimed in claim 7, is characterized in that described filtration medium selects quartz sand.
9. water treatment method as claimed in claim 8, is characterized in that the diameter of described quartz sand is 0.8-1.25mm.
10. an ecoscape water, is characterized in that being prepared from according to method as described in as arbitrary in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110097512.0A CN102745832B (en) | 2011-04-19 | 2011-04-19 | Method for treating town sewage into water for ecological landscape |
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|---|---|---|---|
| CN201110097512.0A CN102745832B (en) | 2011-04-19 | 2011-04-19 | Method for treating town sewage into water for ecological landscape |
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| CN102745832A CN102745832A (en) | 2012-10-24 |
| CN102745832B true CN102745832B (en) | 2015-04-22 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103723851B (en) * | 2013-12-04 | 2015-11-04 | 刘军亮 | A kind of sewage Dual deodorization method based on mixing acid acidifying and ozone oxidation |
| CN106517677B (en) * | 2016-12-29 | 2023-11-17 | 北京东方园林环境股份有限公司 | Quality of reclaimed water landscape water body keeps structure |
| CN109110998A (en) * | 2018-09-21 | 2019-01-01 | 昆明冶金研究院 | A method of removing excrement and urine water biochemical treatment effluent color dilution |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1796314A (en) * | 2004-12-24 | 2006-07-05 | 中国科学院生态环境研究中心 | Method for processing urban sewage deeply |
| CN101977850A (en) * | 2008-03-21 | 2011-02-16 | 美得华水务株式会社 | Process for producing reclaimed water |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000024660A (en) * | 1998-07-09 | 2000-01-25 | Asahi Chem Ind Co Ltd | Water treatment and device therefor |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1796314A (en) * | 2004-12-24 | 2006-07-05 | 中国科学院生态环境研究中心 | Method for processing urban sewage deeply |
| CN101977850A (en) * | 2008-03-21 | 2011-02-16 | 美得华水务株式会社 | Process for producing reclaimed water |
Non-Patent Citations (1)
| Title |
|---|
| 再生水深度处理试验研究;武道吉等;《山东建筑大学学报》;200812;第23卷(第6期);第507页1.1及图1 * |
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