CN100537457C - Combined treating method for reclaimed water reuse - Google Patents
Combined treating method for reclaimed water reuse Download PDFInfo
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- CN100537457C CN100537457C CNB2007101501820A CN200710150182A CN100537457C CN 100537457 C CN100537457 C CN 100537457C CN B2007101501820 A CNB2007101501820 A CN B2007101501820A CN 200710150182 A CN200710150182 A CN 200710150182A CN 100537457 C CN100537457 C CN 100537457C
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Abstract
The invention belongs to the environment engineering field and in particular relates to a recycling combination treatment method for regeneration water with high safety. The combination of the recycling combination treatment method of the invention for the regeneration water is that secondary effluent of sewage treatment plants or water reaching to the quality requirements of the similar water is used as the water source and is reused after the ozone pre-oxidation, the coagulation, the precipitation, the sand filtration, the micropore filtration, the ozone oxidation, the activated carbon adsorption and the disinfection. The invention has the characteristics of strong adaptability to the quality change of the effluent, flexible operation mode, high regeneration water effluent safety, good effluent quality and easy user acceptance. The misgivings of regeneration water users on the water safety can be reduced, which is beneficial to the development of the regeneration water market.
Description
Technical field
The invention belongs to field of environment engineering, particularly a kind of combined treating method for reclaimed water reuse of high security.
Background technology
China is one of 13 poor-water states in the world, and water resource of per capita only is 1/4 of a world average level, and the time and space skewness, through years of researches, generally believes that reclaimed water reuse is one of effective way that solves the shortage of water problem.The reclaimed water reuse technogenic influence the security that reuse water uses, and also affects reuse water water quality, finally has influence on user's popularization.
Sewage by resource utilization, has been acknowledged as second water source through advanced treatment, and reuse of wastewater is not only water-saving effective behave, to the protection water source, reduces and pollutes simultaneously, alleviates groundwater resource shortage situation, plays a part very important.The countries and regions of a lot of lacks of water all adopt reclaimed water reuse partly to solve water shortage problem in the world, many scholars have carried out deep discussion to this problem, many valuable achievements in research have been obtained, a lot of achievements in research have been applied to engineering practice, have received good social benefit and economic benefit.
Reclaimed water reuse technology in the past generally adopts coagulation, precipitation, filtering flow process, wherein:
(1) coagulation and precipitation unit
Coagulating sedimentation is exactly that an amount of coagulating agent is dropped in the sewage, through thorough mixing, reaction, make in the sewage small suspended particle and colloidal solid be in contact with one another reaction and produce cohesion, it is big and be easy to sedimentary flocs unit to become particle, is removed through precipitation again.
Coagulating sedimentation is mainly removed the organic and inorganic pollutant of colloid and small suspended state, from apparent, removes the colourity and the turbidity of sewage exactly; Coagulating sedimentation also has removal effect preferably to BOD, COD, can also reduce bacterium and viral level in the water outlet.
(2) filtering unit is mainly removed the suspended particulate of particle diameter greater than 3 μ m, can further remove biological floe and colloidalmaterial in the sewage, uses water suspension, turbidity reduces significantly, and it is transparent that water outlet becomes; Filter and also can remove part heavy metal, bacterium, viral pollutant, can reduce follow-up sterilization expense.Filtration is that the minimum safe of reclaimed water reuse guarantees.
Respond well through facts have proved this flow process for removal BOD, COD, SS, ammonia nitrogen is had certain removal effect, but removal effect is lower, generally below 10%, also poor to the removal effect of toxic organics.After SARS and high pathogenic avian influenza generation, people have had more deep understanding to the importance of reuse water safety, therefore should be in conjunction with the relative merits of present various processing units, on the basis of removing conventional pollutent, further remove the trace toxic chemical substance, improve the security of reclaimed water reuse, not only significant for the safety that ensures the reuse water user, and for eliminating user's doubt, it is significant to expand reuse water market.
Summary of the invention
The invention provides a kind of combined treating method for reclaimed water reuse of high security, mainly make the reuse water security of production higher, reduce the potential threat that reuse water exists ecological safety, HUMAN HEALTH.
The present invention realizes by following technical process:
Combined treating method for reclaimed water reuse of the present invention, make up as follows: the water that utilizes the secondary effluent of sewage work or reach similar water quality standard is as source water, through reuse after ozone pre-oxidation, coagulation, precipitation, sand filtration, micro-filtrate membrane filtration, ozone oxidation, charcoal absorption, the sterilization.
The residence time of described ozone pre-oxidation is 8 ~ 20min, and dosage is 1 ~ 3mg/l with flooding quantity (unless specified otherwise is together following) for benchmark.
Described coagulation is the medicament that adds polymerize aluminum chloride and clorox at coagulation basin; The dosage of polymerize aluminum chloride is 20 ~ 30mg/l, and the dosage of clorox is 2 ~ 3mg/l, and the effect that adds clorox is to prevent growing of precipitate phase algae.
The residence time of described precipitate phase is 0.6～1.2hr.
The filtrate thickness of described sand filtration is 500 ~ 1000mm, and filtering velocity is 4 ~ 6m/hr.
The aperture of described microfiltration membrane is 0.1～0.3 μ m, and the residence time is 10～30min.
The dosage of described ozone oxidation is 2 ~ 4mg/l, and the residence time is 10～30min.
The residence time of described charcoal absorption is 20～60min, carbon layer 1.0 ~ 2.5m, filtering velocity 5 ~ 7m/hr.
Described sterilization adopts clorox as sterilizing agent, and the dosage of clorox is calculated as 6 ~ 8mg/l according to available chlorine.
Each unitary major function is as follows:
The same prior art of organic mechanism is removed in coagulation of the present invention, precipitation unit and sand filtration unit, in order to reduce processing cost, embody each unitary combination advantage, sedimentation time is reduced to 0.6～1.2hr by 2.0 ~ 4.0hr of routine, so that reduce the volume of settling tank, reduce investment.
Suspended substance, bacterium, parasite, protozoon are mainly removed in the micro-filtrate membrane filtration unit.
Ozone oxidation: ozone is most of organism in the water of decomposition rapidly and widely, thereby can remove the look that impurity caused in the water, smelly, flavor effectively, but generally organism can not be completely oxidized to carbonic acid gas and water, its decolorizing effect is all better than chlorine and gac.Ozone oxidation can reduce delivery turbidity, plays good throwing out, improves filtering filtering velocity or prolongs filtration cycle.
Common ozone pre-oxidation removal inorganics (as iron, manganese) etc., colourity, turbidity and suspended solids, foreign odor flavor; In addition, also can partly reduce natural organic matter and make bacteria inactivation rate; Pre-oxidation treatment can also enhanced coagulation-flocculation-clarifying process, and the purpose of ozone pre-oxidation is the virulent micro polluting substance of degraded, removes the haloform precursor and increases the biodegradable of pollutent; In order fully to remove organism, also need rely on granular carbon (GAC) subsequently to filter, terminal disinfection is removed remaining microorganism and is made disinfection byproduct (DBP) generation minimum.
The ozone oxidation unit mainly is further to remove turbidity, colourity, stink and part micro-content organism.
Charcoal absorption: secondary effluent is after coagulating sedimentation and filtration treatment, again through charcoal absorption, both can remove dissolved organic matter, also can remove colloidal particle residual in the water, microorganism, chlorine residue, trace heavy metal, tensio-active agent, micro-content organism etc., and can be used to decolouring, deodorizing.Charcoal absorption is based on physical adsorption (Van der Waals force), but also has in the acting on of chemisorption.
The present invention has following characteristics: to influent quality change that adaptability is strong, the level of automation height of running, the reuse water water outlet is safe, drive manner is flexible, effluent quality is good and hold susceptible to user acceptance, can reduce the doubt of reuse water user, expand the market of reuse water the reuse water security.
This technology is applicable to reclaimed water reuse (the general 1000m of middle and small scale
3/ d is following).
Technical process of the present invention is compared with the existing processes flow process, and the weak effect of removing COD, total nitrogen, total phosphorus is few, but the effect of removing ammonia nitrogen obviously improves, and can reach 83%, existing reused water processing flow process to ammonia-N removal rate below 10%.
By our studies have shown that, coagulation, precipitation process unit are 8.3% ~ 30% to the micro-content organism removal effect that oestrogenic hormon, alkylphenol etc. influences the animal reproductive development, influences ecological safety and has a carcinogenic effect, and by after the coagulation, precipitation, micro-filtrate membrane filtration, ozone oxidation, be 58% ~ 82% to the clearance of above-mentioned substance.If add activated carbon filtration,, remove efficient and be certain to higher by the adsorption of gac.
Because toxic organics content is low in the water, kind is many, it is bigger to measure difficulty, cost is higher, in order to differentiate the security of reuse water, we have introduced an overall target UV254, a lot of organism in the sewage all have the certain absorption value at the UV-light place of 254nm, and the size of UV254 value has reflected the height of organic content in the water, adopt this index can reflect the security of reuse water indirectly.
Owing to when selecting reused water processing technology, paid attention to not enough in the past to the security of reuse water, only be confined to satisfy index request, thus still have the correlation data of technology now to the UV254 removal effect, but analyze theoretically, treatment scheme in the past is very little to the removal effect of UV254.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.
(1) former water
Secondary effluent with certain sewage work is former water, and the design effluent quality of this factory is during construction:
BOD
5≤30mg/L；COD≤120mg/L；SS≤30mg/L；NH
3-N≤25mg/L。
In the real-world operation process,, cause water outlet COD, ammonia nitrogen can not reach standard because amount of industrial wastewater is bigger in the sewage treatment plant inflow.
At duration of test, the actual influent quality in combined treatment unit is: CODcr is between 21.44 ~ 140.77mg/l in water inlet, influent ammonia nitrogen is between 5.11 ~ 102.61mg/l, the water inlet total nitrogen is between 32.95 ~ 51.62mg/l, the water inlet total phosphorus is between 2.07 ~ 12.30mg/l, and influent turbidity is between 6.43 ~ 13.69mg/l.
(2) treatment scale
Experimental scale is day output water yield 100m
3, about 5m
3/ h.
(3) technical process
What the secondary filter in the flow process was adopted at that time is the membrane filtration of 5 μ m.
The aperture of the micropore filtering film that adopts during test is 0.45 μ m.
At first study, adopt following processing parameter at the removal effect of technical process of the present invention:
Secondary effluent carries out ozone pre-oxidation adding before medicament carries out coagulation, and the residence time of ozone pre-oxidation is 10min, and dosage is 2mg/l.
The medicament that coagulation basin adds comprises polymerize aluminum chloride, clorox.The dosage of polymerize aluminum chloride is 20mg/l, and the dosage of clorox is 2mg/l.
The residence time of precipitate phase is: 0.8hr.
The filtrate thickness of sand filtration is 700mm, and filtering velocity is 5m/hr.
The residence time of ozone oxidation is 20min, and dosage is 3mg/l.
The residence time of charcoal absorption is 40min, carbon layer 2.0m, filtering velocity 6m/hr.
The dosage of sterilizing agent NaCLO is 6mg/l.
At duration of test, the actual effluent quality in combined treatment unit is: CODcr is between 18.72 ~ 39.58mg/l, the water outlet ammonia nitrogen is between 0.60 ~ 30.82mg/l, the water outlet total nitrogen is between 9.84 ~ 49.36mg/l, the water outlet total phosphorus is between 1.14 ~ 3.53mg/l, and delivery turbidity is between 1.25 ~ 3.59mg/l.
For the process combination that further confirms to optimize, the simultaneous verification ozone pre-oxidation is to removing the effect of ammonia nitrogen and UV254, and we select for use following 4 kinds of technical process to carry out comparative experimental research.
1. technical process one
2. technical process two
3. technical process three
4. technical process four
4. technical process is flow process of the present invention.
Employed unitary processing condition are to extract from following condition: default cell process condition is also corresponding default.
The residence time of ozone pre-oxidation is 8 ~ 20min, and dosage is that benchmark is 1 ~ 3mg/l with the flooding quantity.
Coagulation is the medicament that adds polymerize aluminum chloride and clorox at coagulation basin; The dosage of polymerize aluminum chloride is 20 ~ 30mg/l, and the dosage of clorox is 2 ~ 3mg/l, and the effect that adds clorox is to prevent growing of precipitate phase algae.
The sedimentary residence time is 0.6～1.2hr.
The filtrate thickness of sand filtration is 500 ~ 1000mm, and filtering velocity is 4 ~ 6m/hr.
The aperture of microfiltration membrane is 0.1～0.3 μ m, and the residence time is 10～30min.
The dosage of ozone oxidation is 2 ~ 4mg/l, and the residence time is 10～30min.
The residence time of charcoal absorption is 20～60min, carbon layer 1.0 ~ 2.5m, filtering velocity 5 ~ 7m/hr.
Sterilization adopts clorox as sterilizing agent, and the dosage of clorox is calculated as 6 ~ 8mg/l according to available chlorine.
Technical process 1. processing unit is the most complete, do not contain the gac unit in the technical process 2., do not contain secondary filter, millipore filtration unit in the technical process 3., 4. technical process is to have increased the ozone pre-oxidation unit with technical process difference 1., by above-mentioned experiment, various combination that can more several processing units is to removing the especially effect of the pollutent relevant with security of pollutent.
The running effect of above-mentioned four kinds of technical process such as following table:
Four kinds of technical process water outlet effect comparison tables that table 1 is selected
By above-mentioned experimental result as can be seen, 1.～4. flow process is more or less the same to the removal effect of total nitrogen, total phosphorus, CODcr, turbidity, but technical process is 1. better to the removal effect of UV254; 2 pairs of turbidity removal effects of flow process are poor slightly, and this illustrates that also 1. gac role and technical process in removing turbidity contrast, and 4. technical process obviously improves the removal effect of ammonia nitrogen and UV254, and this has also illustrated the effect of ozone pre-oxidation.
By the comparative test of above-mentioned four kinds of technical process, illustrate that relative other combination process of technology of the present invention has higher removal efficient to the pollutent that ammonia nitrogen and UV254 etc. influences reuse water safety.
Find that under study for action because 0.45 μ m is adopted in the aperture of micropore filtering film, the aperture is bigger than normal, and is not good to the removal effect of turbidity, COD, UV254,, change the aperture of micropore filtering film into 0.1 ~ 0.3 μ m in conjunction with new membrane technique.
Process is consulted pertinent literature, and the experience of reference feedwater advanced treatment, from improving the angle of reuse water security, the ozone oxidation unit is placed the unitary front of gac.
The present invention is not limited to the technology described in the example; its description is illustrative; and it is nonrestrictive; authority of the present invention is limited by claim; based on present technique field personnel according to the present invention can change, technology related to the present invention that method such as reorganization obtains, all in protection scope of the present invention.
Claims (8)
1. combined treating method for reclaimed water reuse, it is characterized in that: the water that utilizes the secondary effluent of sewage work or reach similar water quality standard is as source water, through reuse after ozone pre-oxidation, coagulation, precipitation, sand filtration, micro-filtrate membrane filtration, ozone oxidation, charcoal absorption, the sterilization; The residence time of ozone pre-oxidation is 8 ~ 20min, and dosage is that benchmark is 1 ~ 3mg/l with the flooding quantity.
2. combined treating method for reclaimed water reuse as claimed in claim 1 is characterized in that described coagulation is the medicament that adds polymerize aluminum chloride and clorox at coagulation basin; The dosage of polymerize aluminum chloride is 20 ~ 30mg/l, and the dosage of clorox is 2 ~ 3mg/l.
3. combined treating method for reclaimed water reuse as claimed in claim 1 is characterized in that the described sedimentary residence time is 0.6～1.2hr.
4. combined treating method for reclaimed water reuse as claimed in claim 1, the filtrate thickness that it is characterized in that described sand filtration is 500 ~ 1000mm, filtering velocity is 4 ~ 6m/hr.
5. combined treating method for reclaimed water reuse as claimed in claim 1, the aperture that it is characterized in that described microfiltration membrane are 0.1～0.3 μ m, and the residence time is 10～30min.
6. combined treating method for reclaimed water reuse as claimed in claim 1, the residence time that it is characterized in that described ozone oxidation is 10～30min, the ozone dosage is 2 ~ 4mg/l.
7. combined treating method for reclaimed water reuse as claimed in claim 1, the residence time that it is characterized in that described charcoal absorption is 20～60min, carbon layer 1.0 ~ 2.5m, filtering velocity 5 ~ 7m/hr.
8. combined treating method for reclaimed water reuse as claimed in claim 1 is characterized in that the dosage of described sterilizing agent clorox is calculated as 6 ~ 8mg/l according to available chlorine.
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| CN100537457C true CN100537457C (en) | 2009-09-09 |
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| CN102001798B (en) * | 2010-12-24 | 2012-08-29 | 清华大学深圳研究生院 | Method and system for deep purification of drinking water by adopting oxidation-resistant film |
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| CN109319990A (en) * | 2018-11-06 | 2019-02-12 | 广州市真诚环保科技股份有限公司 | A kind of recycled water sterilization method based on ultraviolet technology |
| CN111285491A (en) * | 2018-12-07 | 2020-06-16 | 中国石油天然气股份有限公司 | Concentrated water treatment method and treatment device |
| CN110451703A (en) * | 2019-08-16 | 2019-11-15 | 丽江尚源水业有限公司 | A kind of detection of disinfection by-product of drinking water and minimizing technology |
| CN111592171A (en) * | 2019-08-29 | 2020-08-28 | 沙同叶 | Method and treatment system for purifying high-residue waste liquid |
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Address after: 300051 No. 239, Yingkou Road, Heping District, Tianjin Patentee after: Tianjin municipal engineering design and Research Institute Co.,Ltd. Address before: 300051 No. 239, Yingkou Road, Heping District, Tianjin Patentee before: TIANJIN MUNICIPAL ENGINEERING DESIGN & Research Institute |