CN102515321A - Backflow technology for mixed sludge in settling pond for treating water of low-turbidity micro-polluted water source - Google Patents
Backflow technology for mixed sludge in settling pond for treating water of low-turbidity micro-polluted water source Download PDFInfo
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- CN102515321A CN102515321A CN2011103853430A CN201110385343A CN102515321A CN 102515321 A CN102515321 A CN 102515321A CN 2011103853430 A CN2011103853430 A CN 2011103853430A CN 201110385343 A CN201110385343 A CN 201110385343A CN 102515321 A CN102515321 A CN 102515321A
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Abstract
The invention provides an external backflow technology for mixed sludge in a settling pond for treating water of a low-turbidity micro-polluted water source and belongs to the field of drinking water. A mixing pond, three-level flocculation areas, a settling pond, a sludge storage tank, a tempering pond and a sludge backflow pump are serially connected in turn; coagulants and adsorbents are simultaneously and continuously added into the mixing pond through a feeding pump; raw water is mixed for 0.5-1 minute; coagulant aids are added into a first-level flocculation area and then respectively pass through a second-level flocculation area and a third-level flocculation area, thereby forming a flocculated matter; the settling pond is used for realizing the solid-liquid separation for the flocculated matter; sludge slides to the bottom of the settling pond; the sludge storage tank on the lower part of the settling pond is used for storing and concentrating the sludge; the concentrated mixed sludge is pumped back to the first-level flocculation area by using a pump after passing through the tempering pond; the remained sludge, as the excess sludge, is discharged from the system; and the effluent of the settling pond is the discharging water for processing the system. According to the external backflow technology provided by the invention, the discharging of the production wastewater from a water purifying plant is reduced, the recycling of water resource is realized, the effect of treating the low-turbidity micro-polluted water is increased, the consumption of chemical agents and the sludge output are reduced, and the technology is simple.
Description
Technical field:
The invention belongs to the drinking water treatment field, particularly a kind of settling tank mixing sludge reflux technique of strengthening low turbidity Micro-polluted Water.
Background technology:
Lake and reservoir water be as typical low turbidity drinking water source, usually because low particle concentration, little particle size, stronger wetting ability and low collision and collection efficiency are difficult to coagulating treatment effectively.In recent years; The water body in lake water quality deterioration; The conventional water treatment process of giving to remove turbidity and be major objective has brought the deuce to pay, has poor processing effect, shortcomings such as dosing is big, sludge output is many, water outlet residual aluminum height, adopts improper emergency schedule also can cause the water supply quality accident.Mostly the water-quality guideline of reservoir water can reach more than the water environment quality standard III, pollutes period at low temperature or burst water, bring huge challenge still can for conventional coagulating treatment, and the burst pollution incident of lake and reservoir water has report also the time.
Increased and serious Shuitu is sent out incident, human existence safety is constituted significant threat, becomes the major obstacles of human health, economy and social sustainable development.Owing to 45%～50% of drinking water source, China cities and towns come from lake and reservoir at present; Therefore; Seeking coagulating treatment method effectively a kind of and that tackle lake and reservoir water burst pollution incident flexibly becomes the difficult problem that each big water factory must solve, to reducing the subsequent technique load, ensureing that water supply security is significant.
The mud reflux technique is one of selection of strengthening the conventional coagulation technology of low turbidity micro-polluted source water.Different with the body refuse suspension type of routine or body refuse circular form settling pond is; The external reflux technique of settling tank mixing sludge is set up mud reflux unit (comprising mud storage basin, modified pond and sludge reflux pump and pipeline) on the basis of routine mixing-flocculation-depositing technology; The mixing sludge process is concentrated the modified one-level flocculation zone that is back to; Thereby having overcome conventional settling pond influenced greatly by water quality, the water yield; Upflow velocity is little, makes up complicacy, mixes, flocculates and separates three kinds of technologies and pin down shortcomings such as influence each other.
Summary of the invention:
Handling the problem that exists in turbid micro-polluted source water and the sudden water pollution incident of hanging down to present most of water factories; The invention provides a kind of with low cost, transform simple and flexible, anti-portative power is strong and effect is obvious, settling tank mixing sludge reflux technique that can the low turbid Micro-polluted Water of efficient hardening.
This technology is under the prerequisite of conventional treatment process, and former water gets into the mixing zone through water inlet pipe, simultaneously flocculation agent and sorbent material is added in the former water through the dispensing point.During through one-level flocculation reaction district, add coagulant aids through the former current of mixing zone,, form stable, closely knit flco and accomplish solid-liquid separation after thrust-augmenting nozzle gets into the settling region more respectively through two, three grades of flocculation reaction districts.The water outlet of settling tank top is discharged through overflow, and throw out slides to the bottom storage basin through the slope.With the mixing sludge of storage basin (mixing) by coagulating agent, coagulant aids and sorbent material or oxygenant, organic or inorganic material;, the modified pond of mud is back to the one-level flocculation zone after regulating; Remaining mixing sludge emptying is released, and strengthens the processing of low turbid micro-polluted surface water, handles load thereby reduce subsequent technique; Finally make effluent quality satisfy the water quality requirement in the new sanitary standard for drinking water of issuing of China, ensure the tap water water supply security.
For realizing that the technical scheme that above-mentioned purpose the present invention is adopted is:
A kind of external reflux technique of settling tank mixing sludge of handling low turbid contaminated water source water is characterized in that, comprises placed in-line successively mixing pit, three grades of flocculation zones, settling tank, storage basin, modified pond and sludge reflux pumps;
Coagulating agent and sorbent material add at mixing pit through dosing pump simultaneously continuously, and former water mixes through 0.5～1min; Add coagulant aids at the one-level flocculation zone then, pass through secondary flocculation zone and three grades of flocculation zones more respectively, form flco; Flco is realized solid-liquid separation through settling tank, slides to the settling tank bottom, and the storage basin of settling tank bottom supplies mud to store and concentrate; Mixing sludge after concentrating is drawn back to the one-level flocculation zone with pump through modified pond, and all the other mud are discharged from system as excess sludge, and the water outlet of settling tank is the discharge water of treatment system;
Mud of 3～8 days rows in the every interval of storage basin, the mixing sludge solid content in modified pond is 0.075w/w%～0.12w/w%, the mud backflow volume ratio that is back to the one-level flocculation zone is controlled between 2～10%; When raw water turbidity less than 10NTU, 2mgL
-1≤COD
Mn≤4mgL
-1The time, the backflow volume ratio is controlled at 8～10%; Turbidity is 10～20NTU, 3mgL
-1≤COD
Mn≤3.5mgL
-1The time, the backflow volume ratio is controlled at 4～8%; Turbidity is during greater than 30NTU, and the backflow volume ratio is lower than 4%.
A kind of external reflux technique of settling tank mixing sludge of handling low turbid contaminated water source water; It is characterized in that; Comprise placed in-line successively mixing pit, three grades of flocculation zones, settling tank, storage basin, modified pond and sludge reflux pump and pipelines, concrete technical process is as shown in Figure 1.
Coagulating agent and sorbent material add at mixing pit through dosing pump simultaneously continuously, and former water mixes through 0.5～1min, and corresponding speed gradient G value is followed China's water supply plant design specifications, is 700～1000s
-1(G and GT value are respectively 50～75s at the one-level flocculation zone then
-1, 21600～33600) and add coagulant aids, (G and GT value are respectively 20～40s to pass through the secondary flocculation zone more respectively
-1, 7200～19200) and three grades of flocculation zones (G and GT value are respectively 5～15s
-1, 1800～7200), form and to be beneficial to solid-liquid separation, closely knit flco that settling property is good.Flco is realized solid-liquid separation through settling tank, slides to the settling tank bottom, and the storage basin of its underpart supplies mud to store and concentrate.Mixing sludge after concentrating is drawn back to the one-level flocculation zone with peristaltic pump through modified pond, and all the other mud are discharged from system as excess sludge, and the water outlet of settling tank is the discharge water of treatment system.
Mud of 3～8 days rows in the every interval of storage basin, mixing sludge characteristic such as warps such as mass concentration, solid content new in the modified pond can be stablized in 2～5 days.Mixing sludge solid content through modified is 0.075w/w%～0.12w/w%, and the mud backflow volume ratio that is back to the one-level flocculation zone is controlled between 2～10%, and is stable with the sludge concentration that keeps reaction tank.When raw water turbidity less than 10NTU, 2mgL
-1≤COD
Mn≤4mgL
-1The time, the backflow volume ratio is controlled at 8～10%; Turbidity is 10～20NTU, 3mgL
-1≤COD
Mn≤3.5mgL
-1The time, the backflow volume ratio is controlled at 4～8%; Turbidity is the backflow DeGrain during greater than 30NTU, and the backflow volume ratio is lower than 4%.
Described coagulating agent can be Tai-Ace S 150, aluminum chloride, iron(ic)chloride, Poly aluminum Chloride (PAC), bodied ferric sulfate, or other variously can be used for a kind of in the coagulating agent that tap water produces.Sorbent material can be powder activated carbon PAC, and its material can be ature of coal, wooden, coconut husk etc., also can be in active aluminium dioxide, the zeolite etc. a kind of.Coagulant aids can be a kind of among unslaked lime CaO or Hydrogen chloride HCl, activated silicic acid AS, SEPIGEL 305 PAM etc.Wherein, mixing pit can be pipeline static mixer, mechanically mixing pond, dividing plate mixing pit etc., and the hydraulic detention time of mixing pit is followed China's water supply plant design specifications, is 0.5～1min, and corresponding speed gradient G value is controlled at 700～1000s
-1Flocculation basin can be that the automatic reaction flocculation basin also can be that hydraulic reverse is answered flocculation basin, like dividing plate reaction flocculation basin, orifice plate reaction flocculation basin, waved plate reaction flocculation basin etc.; The total hrt of flocculation basin meets 15～20min in the design specifications, and corresponding overall average G value is 20～50s
-1Settling tank can be that swash plate, tube settler also can be horizontal sedimentation tanks.
Advantage of the present invention:
Adopt this technology to have the following advantages:
1, can reduce the discharging of water purification plant's factory effluent, realize water resources repeat utilize again;
2, can obviously improve low turbidity micro-polluted water treatment effect, reduce chemical consumption amount and mud generation, operational management is simple, and flexible process adjustment significantly reduces the water treatment expense;
3, different with common high-density settling tank, synergy settling pond, suspension with mud reflux types such as plusator, mechanical stirring and circulatior clarifiers; The mud of this technology is realized refluxing outside settling tank; Thereby capacity of resisting impact load is stronger; Can confirm or adjust mud backflow operation condition according to the raw water quality condition, realize mixing, flocculating and the independent steady running that separates three kinds of technologies;
4, this process method is applicable to the transformation of existing water factory, does not increase floor space, does not improve construction costs, is convenient to apply in the technological transformation of the existing middle-size and small-size water factory of China, is convenient to reply burst water pollution incident.
Description of drawings
Fig. 1 process flow sheet.
Embodiment
Through following instance the present invention is elaborated.
Embodiment 1:
Powdered Activated Carbon PAC/ SEPIGEL 305 PAM/ Tai-Ace S 150 settling tank mixing sludge reflux technique enhanced coagulation hangs down turbid micro-polluted water.
Its technical process is: former water gets into mixing pit by raw water pump, and the hydraulic detention time of mixing pit is 0.5min, and the G value is 700s
-1The flocculation stage is divided three grades, and the residence time is respectively 6,6,3min, and total residence time is 15min, and average G value is 50s
-1Tube settler is made up of single circular inclined tube, and upflow velocity is 1～2mm/s, and the residence time is 4～6min.The bottom of tube settler connects joins vertical tube confession mud storage and concentrated, with peristaltic pump the mud in modified pond is drawn back one-level flocculation reaction district, and mixing sludge (solid content is 0.093-0.12w/w%) backflow volume ratio is 10%, and storage basin is mud of 5d row at interval.
The main water-quality guideline of former water is: turbidity 3.21NTU, COD
MnBe 3.35mgL
-1Adopt technology of the present invention, in mixing pit, add PAC and Tai-Ace S 150 continuously, wherein Tai-Ace S 150 is (with Al
3+Meter) the throwing amount is 1.08mg/L, and PAC throwing amount is 8mg/L, and PAM hysteresis Tai-Ace S 150 1min adds in the one-level flocculation zone, and when the throwing amount was 0.1mg/L, heavy back delivery turbidity was reduced to 1.09NTU, COD
MnReduce to 2.63mgL
-1, adopt this reflux technique can effectively improve precipitated outlet water water quality.
Embodiment 2:
Powdered Activated Carbon PAC/ activated silicic acid AS/ Poly aluminum Chloride (PAC) settling tank mixing sludge reflux technique enhanced coagulation hangs down turbid micro-polluted water.
Its technical process is: former water gets into mixing pit by raw water pump, and the hydraulic detention time of mixing pit is 1min, and the G value is controlled at 800s
-1The flocculation stage is divided three grades, and the residence time is respectively 8,8,4min, and the residence time is 20min, and average G value is 50s
-1Tube settler is made up of single circular inclined tube, and upflow velocity is 1～2mm/s, and the residence time is 4～6min.The bottom of tube settler connects joins vertical tube confession mud storage and concentrated, with peristaltic pump the mud in modified pond is drawn back the one-level flocculation zone, and mixing sludge (solid content is 0.085-0.10w/w%) backflow volume ratio is 8%, and storage basin is mud of 3d row at interval.
The main water-quality guideline of former water is: turbidity 17.1 ± 1.14NTU, COD
MnBe 3.61 ± 0.17mgL
-1, TOC is 3.051 ± 0.075mgL
-1, UV
254Be 0.039 ± 0.001cm
-1, DOC is 2.820 ± 0.112mgL
-1, pH value 7.19 ± 0.12,24 ± 1 ℃ of water temperatures, whole alumiunum amount is 0.369 ± 0.044mg/L, total dissolved aluminum amount is 0.236 ± 0.086mg/L.Adopt technology of the present invention, in mixing pit, add PAC and Poly aluminum Chloride (PAC) continuously, wherein Poly aluminum Chloride (PAC) throwing amount is 9mg/L, and PAC throwing amount is 6mg/L, and hysteresis coagulating agent 1min adds 1.485mg/L (with SiO in the one-level flocculation zone
2Meter) during AS, heavy back delivery turbidity is 4.00 ± 0.15NTU, COD
MnBe 2.53 ± 0.10mgL
-1, TOC is 1.88 ± 0.03mgL
-1, UV
254Be 0.027 ± 0.003cm
-1, DOC is 1.686 ± 0.010mgL
-1, adopt this reflux technique can effectively improve precipitated outlet water water quality.
Embodiment 3:
PAC/ activated silicic acid AS/ iron trichloride settling tank mixing sludge reflux technique enhanced coagulation hangs down turbid micro-polluted water.
Its technical process is: former water gets into mixing pit by raw water pump, and the hydraulic detention time of mixing pit is 1min, and the G value is controlled at 1000s
-1The flocculation stage is divided three grades, and every grade of residence time is respectively 8,8, and 4min, total hrt are 20min, and average G value is controlled at 30s
-1Tube settler is made up of single circular inclined tube, and upflow velocity is 1～2mm/s, and the residence time is 4～6min.With peristaltic pump the mud in modified pond is drawn back the one-level flocculation zone, mixing sludge (solid content is 0.078-0.093w/w%) backflow volume ratio is controlled to be 6%, and storage basin is mud of 4d row at interval.
The main water-quality guideline of former water is: turbidity 11.81 ± 0.78NTU, COD
MnBe 3.35 ± 0.37mgL
-1, TOC is 3.047 ± 0.025mgL
-1, UV
254Be 0.038 ± 0.001cm
-1, DOC is 2.789 ± 0.092mgL
-1, pH value 7.39 ± 0.10,16 ± 1 ℃ of water temperatures.Adopt technology of the present invention, add PAC and iron trichloride to mixing pit continuously, wherein iron trichloride throwing amount is 12mg/L, and PAC/ throwing amount is 8mg/L, and hysteresis coagulating agent 1min adds AS in the one-level flocculation zone, and the throwing amount is that 2.415mg/L is (with SiO
2Meter), mixing sludge backflow volume ratio is 6%, and storage basin is mud of 4d row at interval.Heavy back delivery turbidity is 2.04 ± 0.12NTU, COD
MnBe 2.29 ± 0.12mgL
-1, TOC is 1.68 ± 0.12mgL
-1, UV
254Be 0.022 ± 0.002cm
-1, DOC is 1.486 ± 0.015mgL
-1, this technology is remarkable to removal effect of organic matter, former water after coagulating sedimentation is handled in the water outlet organism water-quality guideline just reached " drinking water sanitary standard " (GB5749-2006) related request.
Embodiment 4:
PAC/ SEPIGEL 305 APAM/ iron trichloride settling tank mixing sludge reflux technique enhanced coagulation hangs down turbid micro-polluted water.
Its technical process is: former water gets into mixing pit by raw water pump, and the hydraulic detention time of mixing pit is 1min, and the G value is controlled at 1000s
-1The flocculation stage is divided three grades, and every grade of residence time is respectively 8,8, and 4min, total hrt are 20min, and average G value is controlled at 35s
-1Tube settler is made up of single circular inclined tube, and upflow velocity is 1～2mm/s, and the residence time is 4～6min.With peristaltic pump the mud in modified pond is drawn back the one-level flocculation zone, mixing sludge (solid content is 0.089-0.1032w/w%) backflow volume ratio is controlled to be 6%, and storage basin is mud of 8d row at interval.
The main water-quality guideline of former water is: turbidity 15.37 ± 0.43NTU, COD
MnBe 3.85 ± 0.47mgL
-1, TOC is 3.717 ± 0.037mgL
-1, UV
254Be 0.046 ± 0.002cm
-1, DOC is 3.342 ± 0.063mgL
-1, pH value 8.02 ± 0.10,18 ± 1 ℃ of water temperatures.Adopt technology of the present invention; Add PAC and iron trichloride to mixing pit continuously, wherein iron trichloride throwing amount is 15mg/L, and PAC throwing amount is 10mg/L; Hysteresis coagulating agent 1min adds APAM in the one-level flocculation zone; The throwing amount is 0.5mg/L, and mixing sludge backflow volume ratio is 6%, and storage basin is mud of 8d row at interval.Heavy back delivery turbidity is 3.21 ± 0.12NTU, COD
MnBe 2.68 ± 0.42mgL
-1, TOC is 2.381 ± 0.112mgL
-1, UV
254Be 0.024 ± 0.002cm
-1, DOC is 1.886 ± 0.015mgL
-1, this technology is remarkable to removal effect of organic matter.
Claims (1)
1. the external reflux technique of settling tank mixing sludge of handling low turbid contaminated water source water is characterized in that, comprises placed in-line successively mixing pit, three grades of flocculation zones, settling tank, storage basin, modified pond and sludge reflux pumps;
Coagulating agent and sorbent material add at mixing pit through dosing pump simultaneously continuously, and former water mixes through 0.5～1min; Add coagulant aids at the one-level flocculation zone then, pass through secondary flocculation zone and three grades of flocculation zones more respectively, form flco; Flco is realized solid-liquid separation through settling tank, slides to the settling tank bottom, and the storage basin of settling tank bottom supplies mud to store and concentrate; Mixing sludge after concentrating is drawn back to the one-level flocculation zone with pump through modified pond, and all the other mud are discharged from system as excess sludge, and the water outlet of settling tank is the discharge water of treatment system;
Mud of 3～8 days rows in the every interval of storage basin, the mixing sludge solid content in modified pond is 0.075w/w%～0.12w/w%, the mud backflow volume ratio that is back to the one-level flocculation zone is controlled between 2～10%; When raw water turbidity less than 10NTU, 2mgL
-1≤COD
Mn≤4mgL
-1The time, the backflow volume ratio is controlled at 8～10%; Turbidity is 10～20NTU, 3mgL
-1≤COD
Mn≤3.5mgL
-1The time, the backflow volume ratio is controlled at 4～8%; Turbidity is during greater than 30NTU, and the backflow volume ratio is lower than 4%.
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| CN103539292A (en) * | 2013-11-18 | 2014-01-29 | 江苏省环境科学研究院 | Coagulation and sedimentation method for deep treatment of biochemical tail water of printing and dyeing wastewater |
| CN104071928A (en) * | 2014-07-16 | 2014-10-01 | 哈尔滨工业大学 | Intensive treating system for low-temperature low-turbid high-ammonia nitrogen water and treating method of intensive treating system |
| CN104529005A (en) * | 2014-12-29 | 2015-04-22 | 北京中研同仁堂医药研发有限公司 | Multistage combined flocculation device and process for selectively removing aconitine type toxic ingredients from traditional Chinese medicine processing wastewater by using same |
| CN105776735A (en) * | 2016-03-11 | 2016-07-20 | 山东建筑大学 | New water purifying method of removing off-flavor type organic compounds from micro-scale polluted water sources |
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| CN107265597A (en) * | 2017-08-15 | 2017-10-20 | 武汉轻工大学 | Handle method, equipment and the system of low turbid surface water |
| CN110330085A (en) * | 2019-07-18 | 2019-10-15 | 成都市自来水有限责任公司 | Coagulating sedimentation system and technique based on zeta current potential and SS control dosing returned sludge |
| CN110436596A (en) * | 2019-09-05 | 2019-11-12 | 辽宁城建设计院有限公司 | A kind of processing of combined type backwashing water and reclaiming system |
| CN110745994A (en) * | 2019-11-06 | 2020-02-04 | 天津水务集团有限公司 | Coagulation method suitable for low-turbidity low-organic matter raw water |
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| CN103496832A (en) * | 2013-10-14 | 2014-01-08 | 北京工业大学 | Method of improving quality of settled water from sludge return process by ultrasonic wave |
| CN103539292A (en) * | 2013-11-18 | 2014-01-29 | 江苏省环境科学研究院 | Coagulation and sedimentation method for deep treatment of biochemical tail water of printing and dyeing wastewater |
| CN103539292B (en) * | 2013-11-18 | 2015-04-08 | 江苏省环境科学研究院 | Coagulation and sedimentation method for deep treatment of biochemical tail water of printing and dyeing wastewater |
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| CN104071928B (en) * | 2014-07-16 | 2016-04-06 | 哈尔滨工业大学 | Low-temperature and low turbidity height ammonia nitrogen enhanced water treatment system and treatment process thereof |
| CN104529005A (en) * | 2014-12-29 | 2015-04-22 | 北京中研同仁堂医药研发有限公司 | Multistage combined flocculation device and process for selectively removing aconitine type toxic ingredients from traditional Chinese medicine processing wastewater by using same |
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| CN106673255A (en) * | 2016-12-22 | 2017-05-17 | 北京恩菲环保技术有限公司 | Wastewater treatment method and wastewater treatment device |
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| CN110330085A (en) * | 2019-07-18 | 2019-10-15 | 成都市自来水有限责任公司 | Coagulating sedimentation system and technique based on zeta current potential and SS control dosing returned sludge |
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| CN110745994A (en) * | 2019-11-06 | 2020-02-04 | 天津水务集团有限公司 | Coagulation method suitable for low-turbidity low-organic matter raw water |
| CN110745994B (en) * | 2019-11-06 | 2022-05-10 | 天津水务集团有限公司 | Coagulation method suitable for low-turbidity low-organic matter raw water |
| CN111499121A (en) * | 2020-05-27 | 2020-08-07 | 中电环保股份有限公司 | CBS- (I) type combined system and process for low-concentration sewage |
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Application publication date: 20120627 |