CN103787525B - A kind of method of municipal effluent secondary biochemical effluent advanced treatment - Google Patents
A kind of method of municipal effluent secondary biochemical effluent advanced treatment Download PDFInfo
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Abstract
The present invention discloses a kind of method of municipal effluent secondary biochemical effluent advanced treatment and reuse, comprises following treatment step: (1) lime soften for sewage process; (2) coagulating kinetics; (3) oxide treatment; (4) filtration treatment; (5) ultrafiltration and reverse-osmosis treated; Wherein, the oxide treatment described in step (3) is oxygenant with ozone, arranges adsorbent bed in oxidation reactor.The method operating process is simple, flow process is short, processing costs is low, is applicable to process the higher effluent of municipal sewage plant of COD, colourity and salts contg, reaches sewage recycling and utilizes and Industrial Water Saving object, meet the requirement of recycling industries and clean production etc.
Description
Technical field
The present invention relates to a kind of method of advanced treatment of municipal effluent secondary biochemical effluent, be applicable to process the higher effluent of municipal sewage plant of COD, colourity, hardness and salts contg.
Background technology
City sewage deep treatment reuse is one of effective way solving current Urban Water Shortage Problem of Cities.Municipal effluent is that a kind of water yield is stablized, supplied reliable Ecology, after conventional biochemical treatment, although BOD
5processed to 10mg/L, even below 5mg/L, but secondary biochemical effluent COD is still up to more than 100mg/L, and containing part refractory organic, colourity and inorganic salt, cannot meet the water quality requirement that industrial boiler water-supply is done in reuse.
Usually " coagulation+clarification+filtration+sterilization " combined method is adopted to carry out advanced treatment to municipal wastewater treatment plant secondary biochemical effluent at present, its object is mainly used for suspended substance, the turbidity of water in removal and kills disease carrying germ in water, but it is lower to the clearance of dissolved matter, can not realize COD, colourity, total dissolved solid and hardness, the removing of basicity, this method is not suitable for the Treatment for Reuse of the higher effluent of municipal sewage plant of COD, colourity and salts contg.In order to ensure that municipal wastewater treatment plant effluent reuse does industrial water supply,
cN101544448Apropose a kind of urban sewage recycling in the method for recirculated cooling water and boiler water feeding, externally discharged waste water municipal wastewater treatment plant being met after second-stage treatment emission standard sends into MBBR, in MBBR, BOD and ammonia nitrogen are degraded, water outlet enters coagulation, air-dissolving air-float, multi-medium filtering process successively, and the water outlet after process is reuse after ultrafiltration and reverse osmosis desalination process again.The method before waste water enters two film, relies on moving-bed membrane bioreactor (MBBR) and the bio-degradable organism that adds in flocculation medicament removal water and larger molecular organics, the COD in water quality, suspended substance and turbidity is made to meet two film water inlet control overflow, but MBBR biological treatment is taken up an area large, invest high, do not possess the removal means to solubility difficult for biological degradation organism, colourity and hardness, basicity, be therefore unsuitable for the Treatment for Reuse of the higher municipal sewage plant's secondary biochemical treatment water outlet of trade effluent proportion.
cN1796314Aa kind of city sewage deep treatment method is proposed, by adopting coagulation and filtration, ozone oxidation, biologic active carbon filtration, reverse-osmosis treated to water outlet, reach and remove difficult degradation microorganism, bacterium, virus, colourity etc. remaining in municipal wastewater treatment plant secondary biochemical effluent, realize the object of water security reuse in municipal administration.But this processing method is mainly applicable to the low concentration wastewater process of COD≤50mg/L, colourity≤30 degree, is not suitable for containing the higher trade effluent of refractory organics COD, colourity and hardness.
cN101182084Apropose combined treating method for reclaimed water reuse, by adopting ozone pre-oxidation coagulation, precipitation, sand filtration, millipore filtration, ozone oxidation, charcoal absorption to municipal sewage plant secondary biochemical effluent, disinfecting, realize municipal Treated sewage reusing.But although this processing method selects ozone Oxidation Treatment, but ozone is difficult to permineralization organism in lower concentration and short residence time(SRT), and do not possess desalination process, therefore, this method is mainly applicable to the lower municipal effluent secondary biochemical effluent of salts contg, and the water outlet conductivity after process, total salt cannot meet the water quality requirement that industrial boiler water-supply is done in reuse.
Based on above analysis, for with the higher municipal sewage plant's secondary biochemical treatment water outlet of trade effluent proportion, because difficult for biological degradation COD, colourity, hardness, basicity, specific conductivity are higher, there is no the Technology that industrial boiler water-supply is done in reliable treatment for reuse, particularly reuse at present.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of method of municipal wastewater treatment plant secondary biochemical effluent advanced treatment, is applicable to the effluent of municipal sewage plant that COD, colourity, hardness and salts contg are higher.The water outlet adopting this treatment process to obtain can make industrial boiler water-supply by direct reuse.
A method for municipal effluent secondary biochemical effluent advanced treatment, comprises (1) lime soften for sewage process successively; (2) coagulating kinetics; (3) oxide treatment; (4) filtration treatment; (5) processing unit such as ultrafiltration and reverse-osmosis treated, concrete operation step is as follows:
(1) lime soften for sewage process, the bio-chemical effluent from municipal sewage plant fully mixes with saturated milk of lime in line mixer, controls mixed solution pH value and reaches 9.5 ~ 10.5, make the HCO in water
3 -with OH
-there is neutralization reaction and form CO
3 2-, with Ca
2+, Mg
2+plasma generates carbonate deposition, is removed, reduce water hardness in precipitation process of coagulation subsequently.Coagulating kinetics is carried out in mixing water outlet.
(2) coagulating kinetics, composite waste after step (1) lime soften for sewage process directly enters coagulative precipitation tank, under the flocculation agent added and the effect of residual lime coagulant aids, the throw out in water and suspended substance are removed by clarification, clarification and effluent carries out oxide treatment.The pH value of this unit keeps weakly alkaline always, need not regulate.Waste water is 10 ~ 30min at the hydraulic detention time of coagulative precipitation tank.The flocculation agent added in coagulative precipitation tank is conventional organic and inorganic type flocculation agent, and wherein organic floculant is polyacrylamide, and dosage is 1 ~ 5mg/L; Inorganic flocculating agent can adopt bodied ferric sulfate or iron trichloride, and dosage is 10 ~ 30mg/L.By this cell processing, the throw out that in waste water, original suspended substance and step (1) produce can obtain deep removal, goes out water suspension≤10mg/L, turbidity≤5NTU, goes out the water hardness≤150mg/L(with CaCO
3meter), basicity≤150mg/L(is with CaCO
3meter), colourity, COD also obtain part and remove simultaneously.
(3) oxide treatment, the waste water after step (2) coagulating kinetics is sent into oxidation reactor, and oxygenant is ozone.Arrange adsorbent bed in oxidation reactor, sorbent material is haydite, gac or hard coal, and particle diameter is 5 ~ 10mm, and packing ratio is 50% ~ 75% of reactor volume.By adding adsorbability material in oxidizing reaction, the organism of the difficult for biological degradation in waste water can be absorbed fast, it is made to stop in the reactor, fully carry out oxidizing reaction until permineralization in the basic conditions, greatly improve the removal efficiency of COD, and decrease the hydraulic detention time of waste water and the dosage of ozone.Organism on sorbent material generates CO after ozone oxidation
2and H
2o, reaches and improves water quality and decolouring object; Sorbent material can recover characterization of adsorption again after ozone oxidation regeneration, and after process, water outlet COD is lower without the need to proceeding biochemical treatment.Detailed process is: after coagulating kinetics, water outlet enters oxidation reactor by bottom after fully mixing with ozone oxidation agent in line mixer, and the organism of the difficult for biological degradation such as the colourity in waste water is trapped within adsorption layer, and under alkaline condition, ozone is formed
.oH can by organism complete oxidation to CO
2and H
2o, reaches the colourity removing waste water and the object improving COD clearance.The ozone of this unit is provided by the ozonizer outside treatment unit, and the dosage of ozone is 5 ~ 20mg/L waste water, is preferably 6 ~ 12mg/L waste water, and the hydraulic detention time of waste water in oxidation reactor is 10 ~ 20min.By this cell processing, the colourity in waste water can remove more than 90%, effluent color dilution≤10 degree; Water outlet COD≤50mg/L.
(4) filtration treatment, carries out filtration treatment by the water outlet after step (3) adsorb ozone process, and after process, uf processing is carried out in water outlet.Coarse filtration unit can select conventional filter plant, as more medium filter, sand filtration, drift sand strainer or millipore filter etc.By carrying out filtration treatment to waste water, making water outlet SS≤20mg/L, turbidity≤5NTU, meeting into ultrafiltration and reverse-osmosis treated requirement.
(5) ultrafiltration and reverse-osmosis treated, ultrafiltration and reverse osmosis desalination process are carried out in the water outlet after step (4) filtration treatment, and the effluent reuse after process does industrial boiler water-supply.Ultrafiltration and reverse osmosis units can select conventional ultrafiltration and reverse osmosis equipment.Waste water index after the process of step (1) ~ (4) can meet the water inlet index request into ultrafiltration and reverse osmosis, as COD≤50mg/L, turbidity≤5NTU, hardness≤150mg/L, basicity≤350mg/L, colourity≤30 degree, after this cell processing, effluent quality can meet the water quality requirement reuse that industrial boiler water-supply is done in reuse comprehensively, and can keep the long-term operation of film.
The inventive method occupies municipal sewage plant's secondary biochemical effluent of larger proportion for object with industrial sewage, adopt lime soften for sewage, coagulating sedimentation, oxide treatment, filtration, ultrafiltration and reverse osmosis combined treatment flow process respectively, treating processes is simple, flow process is short, working cost is low, after process, water outlet can meet the water quality requirement reuse that industrial boiler water-supply is done in reuse, and can ensure the long-term operation of ultrafiltration and reverse osmosis membrane assembly.
The method that the present invention proposes can realize the advanced treatment containing the higher effluent of municipal sewage plant of COD, colourity, hardness and salts contg, its reuse is made to do industrial boiler water-supply, reach sewage recycling to utilize and Industrial Water Saving object, meet the requirement of recycling industries and clean production etc.
Accompanying drawing explanation
Fig. 1 is the method process flow diagram of a kind of concrete municipal wastewater treatment plant secondary biochemical effluent advanced treatment of the present invention.
1-lime soften for sewage line mixer; 2-coagulative precipitation tank; 3-oxidation reactor; 4-strainer; 5-ultra-filtration equipment; 6-reverse osmosis unit.
Embodiment
Be described below in conjunction with the specific embodiment of accompanying drawing to the inventive method.
Lime soften for sewage line mixer 1 squeezed into continuously by secondary biochemical effluent pump from municipal sewage plant, fully mix with saturated milk of lime, control the add-on of saturated milk of lime, the pH value of composite waste is remained on 9.5 ~ 10.5, after calcium salt in water, magnesium salts and milk of lime generation chemical precipitation are reacted, enter coagulative precipitation tank 2 and carry out flocculate and clarify separation.In coagulative precipitation tank 2, drop into inorganic flocculating agent and organic floculant continuously simultaneously, make calcium that in waste water, original suspended substance and milk of lime softening process produce, magnesium precipitate thing flocculation sediment under the effect of flocculation agent and excess hydrogen calcium oxide flocculating aids, hardness in waste water, suspended substance and turbidity obtain deep removal, and colourity and COD also obtain part removal simultaneously.Water outlet after flocculate and clarify fully mixes rear feeding oxidation reactor 3 with the ozone oxidation agent from ozonizer (unlisted in figure) and processes in line mixer (unlisted in figure).In oxidation reactor 3, the organism in waste water is attracted on the surface of sorbent material fast, and under alkaline condition, ozone produces hydroxyl radical free radical (HO after decomposing in water
.) etc. intermediate product, HO
.directly by the organism permineralization on sorbent material, CO can be generated
2and H
2o, recovers again its adsorption activity after adsorbent reactivation.Water outlet after adsorption and oxidation is sent into strainer 4 and is carried out de-suspended substance process, and water outlet finally enters ultra-filtration equipment 5 again and reverse osmosis unit 6 carries out advanced desalination process.Various low concentration pollutants in waste water, inorganic salt even depth are removed in ultra-filtration equipment 5 and reverse osmosis unit 6, the water outlet (pure water) obtained can meet industrial boiler water-supply water quality requirement and carry out reuse.Simultaneously, because of waste water enter ultra-filtration equipment 5 and reverse osmosis unit 6 before have passed through above perfect preprocessing process, main water inlet index COD≤50mg/L, turbidity≤5NTU, hardness≤150mg/L, basicity≤350mg/L, colourity≤30 degree, can keep the long-time running of ultrafiltration and reverse osmosis membrane assembly.
The secondary biochemical effluent of inventive method to the municipal sewage plant occupying larger proportion with industrial sewage is adopted to adopt lime soften for sewage, coagulating sedimentation, oxidation, filtration, ultrafiltration and the process of reverse osmosis combination process, after process, water outlet can reach the water quality requirement that industrial boiler water-supply is done in reuse, and then the municipal sewage as a resource achieving high COD, colourity, hardness and salts contg utilizes and Industrial Water Saving object, meets the requirement of recycling industries and clean production etc.
The inventive method and effect is further illustrated below by embodiment.
embodiment 1
Treatment process of the present invention is adopted to carry out advanced treatment test to certain municipal sewage plant's secondary biochemical effluent domestic.Because of the pharmacy waste water containing a large amount of difficult for biological degradation in the water inlet of this municipal sewage plant, after second-stage treatment, bio-chemical effluent COD100 ~ 140mg/L, pH7.2 ~ 7.5, ammonia nitrogen 28-35mg/L, colourity 175 ~ 200 degree, BOD
50 ~ 5mg/L, turbidity 10 ~ 25NTU, total hardness 380 ~ 520mg/L, total alkalinity 350 ~ 400mg/L, specific conductivity 3000 ~ 3200 μ s/cm.
Adopt method of the present invention, combined treatment test is carried out to above-mentioned waste water.Wastewater treatment scale is 1m
3/ h, the main experimental device of each processing unit is formed, operational conditions and treatment effect be in table 1.After method process of the present invention, effluent index can meet the water quality requirement that oiler feed is done in reuse, i.e. turbidity≤0.3NTU, COD
mn≤ 2mg/L, ammonia nitrogen≤0.5mg/L, specific conductivity≤100 μ s/cm, total hardness≤15mg/L are (with CaCO
3meter), total alkalinity≤20mg/L is (with CaCO
3meter), deionized water can be substituted as industrial boiler water-supply reuse.
The main processing units of table 1 embodiment 1 is formed and treatment effect
| processing unit title | treatment unit scale and mainly forming | main operational conditions and controling parameters | process water outlet or effect |
| 1 lime soften for sewage | line mixer, material PVC. | wastewater flow 1m 3/ h; Add saturated milk of lime 500mg/L; Mixed solution pH value 9.80. | influent COD 120mg/L, pH 7.36, ammonia nitrogen 30 mg/L, colourity 180 degree, BOD 52.0mg/L, turbidity 20NTU, total hardness 450mg/L, total alkalinity 680mg/L, specific conductivity 3100 μ s/cm. |
| 2 coagulative precipitation tanks | pVC material, volume 0.5m 3, built-in agitator stirs flocculation agent. | wastewater flow 1m 3/ h; Add bodied ferric sulfate inorganic flocculating agent 20 mg/L, polyacrylamide 2 mg/L; Mixed solution pH value 9.62.Waste water hydraulic detention time 30 min. | water outlet COD 98mg/L, pH 9.62, colourity 125 degree, turbidity 5 NTU, total hardness 200mg/L, total alkalinity 635mg/L. |
| 3 oxidation reactors | the tower cylindrical reactor of PVC material, useful volume 0.3m 3, external ozonizer, built-in adsorption layer, sorbent material is haydite, particle diameter 5 ~ 10 mm, and packing ratio is 50%. | wastewater flow 1m 3/ h; Ozone dosage 6.58 mg/L; Retention time of sewage 10 min; Mixed solution pH value 9.62. | water outlet COD 48 mg/L, pH 7.85, total alkalinity 152 mg/L, ammonia nitrogen 1.5 mg/L, colourity 8 degree, turbidity 4.5 mg/L. |
| 4 strainers | adopt multi-medium filtering post, material synthetic glass, size of main body is: diameter 300mm, high 2350mm; Interior filled stone sand and ANTHRACITE FILTER MEDIA; Adopt upflowing water outlet. | wastewater flow 1m 3/ h; Within every 2 days, instead clean once. | water outlet COD 42mg/L, turbidity 2.8NTU, SS≤5, pH 7.76, ammonia nitrogen 1.3 mg/L, colourity≤8 degree. |
| 5 ultrafiltration+reverse osmosis unit | adopt LG-DOW membrane module; Designing treatment amount 1.0 m 3/ h. | operate continuously, water rate 70% processed. | delivery turbidity 0.25 NTU, COD mn0.36 mg/L, ammonia nitrogen 0.3 mg/L, specific conductivity 58 μ s/cm, total hardness 13.5mg/L are (with CaCO 3meter), total alkalinity 15.2mg/L is (with CaCO 3meter) |
embodiment 2
Adopt the treatment unit of embodiment 1, process the sewage identical with embodiment 1, the water treatment effect that the operational conditions changing each processing unit obtains is in table 2.
The main processing units of table 2 embodiment 2 is formed and treatment effect
| processing unit title | treatment unit scale and mainly forming | main operational conditions and controling parameters | process water outlet or effect |
| 1 lime soften for sewage | line mixer, material PVC. | wastewater flow 1m 3/ h; Add saturated milk of lime 650mg/L; Mixed solution pH value 10.50. | influent COD 140mg/L, pH 7.45, ammonia nitrogen 28 mg/L, colourity 200 degree, BOD 52.5mg/L, turbidity 15NTU, total hardness 384mg/L, total alkalinity 980 mg/L, specific conductivity 3150 μ s/cm. |
| 2 coagulative precipitation tanks | pVC material, volume 0.5m 3, built-in agitator stirs flocculation agent. | wastewater flow 1m 3/ h; Add bodied ferric sulfate inorganic flocculating agent 25mg/L, polyacrylamide 3mg/L; Mixed solution pH value 10.30.Waste water hydraulic detention time 30min. | water outlet COD 115mg/L, pH 10.30, colourity 125 degree, turbidity 6.5 NTU, total hardness 180 mg/L, total alkalinity 926 mg/L. |
| 3 oxidation reactors | the tower cylindrical reactor of PVC material, useful volume 0.3m 3, external ozonizer, built-in adsorption layer, sorbent material is haydite, particle diameter 5 ~ 10 mm, and packing ratio is 75%. | wastewater flow 1m 3/ h; Ozone dosage 11.75mg/; Waste water hydraulic detention time 18min; Mixed solution pH value 10.30. | water outlet COD 42mg/L, pH 7.21, total alkalinity 56 mg/L, ammonia nitrogen 0.6 mg/L, colourity 5 degree, turbidity 3.8 mg/L. |
| 4 strainers | adopt multi-medium filtering post, material synthetic glass, size of main body is: diameter 300mm, high 2350mm; Interior filled stone sand and ANTHRACITE FILTER MEDIA; Adopt upflowing water outlet. | wastewater flow 1m 3/ h; Within every 2 days, instead clean once. | water outlet COD 40mg/L, turbidity 2.3NTU, SS≤5, pH 7.35, ammonia nitrogen 0.55 mg/L, colourity≤5 degree. |
| 5 ultrafiltration+reverse osmosis unit | adopt LG-DOW membrane module; Designing treatment amount 1.0 m 3/ h. | operate continuously, water rate 70% processed. | delivery turbidity 0.2NTU, COD mn0.24mg/L, ammonia nitrogen 0.15 mg/L, specific conductivity 50 μ s/cm, total hardness 10.2 mg/L are (with CaCO 3meter), total alkalinity 12.4mg/L is (with CaCO 3meter) |
Claims (7)
1. a method for municipal effluent secondary biochemical effluent advanced treatment, is characterized in that: comprise following treatment step successively: (1) lime soften for sewage process; (2) coagulating kinetics; (3) oxide treatment; (4) filtration treatment; (5) ultrafiltration and reverse-osmosis treated; Wherein, in the lime soften for sewage process of step (1), lime mixes in line mixer with waste water, controls the pH value 9.5 ~ 10.5 of the rear waste water of mixing; Oxide treatment described in step (3) is oxygenant with ozone, arranges adsorbent bed in oxidation reactor, and the sorbent material of employing is haydite or hard coal, and particle diameter is 5 ~ 10mm, and packing ratio is 50% ~ 75% of reactor volume; Step (4) filtration treatment adopts multi-medium filtering, sand filtration, drift sand to filter or millipore filtration.
2. in accordance with the method for claim 1, it is characterized in that: in step (1) lime soften for sewage process, adopt saturated milk of lime.
3. in accordance with the method for claim 1, it is characterized in that: in step (2) coagulating kinetics, the hydraulic detention time of waste water in coagulative precipitation tank is 10 ~ 30min.
4. in accordance with the method for claim 1, it is characterized in that: the flocculation agent added in step (2) coagulating kinetics is organic floculant and inorganic flocculating agent.
5. in accordance with the method for claim 4, it is characterized in that: the inorganic flocculating agent added in step (2) coagulating kinetics is bodied ferric sulfate or iron trichloride, dosage is 10 ~ 30mg/L.
6. in accordance with the method for claim 4, it is characterized in that: the organic floculant added in step (2) coagulating kinetics is polyacrylamide, dosage is 1 ~ 5mg/L.
7. in accordance with the method for claim 1, it is characterized in that: in step (3) oxide treatment, the dosage of ozone is 5 ~ 20mg/L waste water, the hydraulic detention time of waste water in oxidation reactor is 10 ~ 20min.
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| CN104016510B (en) * | 2014-05-22 | 2016-04-06 | 国家电网公司 | The Application way of a kind of thermal power plant reverse osmosis concentrated water and municipal effluent interaction process |
| CN104773875A (en) * | 2015-04-08 | 2015-07-15 | 上海依科绿色工程有限公司 | Deep treatment method of automobile manufacturing plant up-to-standard discharged wastewater |
| CN105217842A (en) * | 2015-10-30 | 2016-01-06 | 无锡市嘉邦电力管道厂 | A kind of waste water treatment process |
| WO2017219028A1 (en) | 2016-06-17 | 2017-12-21 | Qatar Foundation For Education, Science And Community Development | System and method for advanced oxidation of treated sewage effluent |
| CN109455849A (en) * | 2018-12-06 | 2019-03-12 | 华能嘉祥发电有限公司 | Bi-membrane method recycled water advanced treatment based on control membrane fouling improves technique and device |
| CN110803794A (en) * | 2019-09-16 | 2020-02-18 | 金鼎文 | Precipitation fine filtration method for sewage treatment |
| CN112408716B (en) * | 2020-11-27 | 2023-02-03 | 广东佳德环保科技有限公司 | Method for treating cold rolling wastewater |
| CN116081843A (en) * | 2021-10-29 | 2023-05-09 | 北京万邦达环保技术股份有限公司 | Industrial wastewater advanced treatment system |
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