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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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000010802 sludge Substances 0.000 title claims abstract description 45
- 238000005516 engineering process Methods 0.000 title description 15
- 238000002156 mixing Methods 0.000 claims abstract description 55
- 238000005189 flocculation Methods 0.000 claims abstract description 47
- 230000016615 flocculation Effects 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000010992 reflux Methods 0.000 claims abstract description 22
- 239000000701 coagulant Substances 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims description 8
- 239000002594 sorbent Substances 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 abstract description 7
- 235000020188 drinking water Nutrition 0.000 abstract description 6
- 239000003651 drinking water Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000746 purification Methods 0.000 abstract description 2
- 230000003750 conditioning effect Effects 0.000 abstract 2
- 239000003463 adsorbent Substances 0.000 abstract 1
- 239000013043 chemical agent Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 abstract 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 5
- 238000005345 coagulation Methods 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 5
- 230000002572 peristaltic effect Effects 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 230000001112 coagulating effect Effects 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
一种处理低浊受污染水源水的沉淀池混合污泥体外回流工艺属于饮用水领域。包括依次串联的混合池、三级絮凝区、沉淀池、储泥池、调质池及污泥回流泵；混凝剂和吸附剂通过加药泵同时连续投加在混合池，原水经0.5～1min混合；然后在一级絮凝区投加助凝剂，再分别经过二级絮凝区和三级絮凝区，形成絮体；絮体经沉淀池实现固液分离，滑至沉淀池底部，沉淀池下部的储泥池供污泥贮存和浓缩；浓缩后的混合污泥经调质池用泵抽回至一级絮凝区，其余污泥作为剩余污泥从系统中排出，沉淀池的出水为处理系统的排放水。本发明减少净水厂生产废水的排放，实现水资源的重复再利用；提高低浊度微污染水处理效果，降低化学药剂消耗量和污泥产生量，工艺简单。
The invention relates to an extracorporeal reflux process of mixed sludge in a sedimentation tank for treating low-turbidity polluted source water, which belongs to the field of drinking water. Including mixing tank, tertiary flocculation zone, sedimentation tank, mud storage tank, conditioning tank and sludge return pump connected in series in sequence; coagulant and adsorbent are continuously added to the mixing tank through the dosing pump at the same time, and the raw water passes through 0.5~ Mix for 1min; then add coagulant aid in the primary flocculation zone, and then pass through the secondary flocculation zone and tertiary flocculation zone respectively to form flocs; the flocs pass through the sedimentation tank to achieve solid-liquid separation, slide to the bottom of the sedimentation tank, and The sludge storage tank at the bottom is used for sludge storage and concentration; the concentrated mixed sludge is pumped back to the primary flocculation area through the conditioning tank, and the remaining sludge is discharged from the system as excess sludge, and the effluent of the sedimentation tank is treated System drain water. The invention reduces the discharge of production wastewater in a water purification plant, realizes repeated reuse of water resources, improves the treatment effect of low-turbidity micro-polluted water, reduces the consumption of chemical agents and the amount of sludge produced, and has a simple process.
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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103853430A CN102515321A (en) | 2011-11-28 | 2011-11-28 | Backflow technology for mixed sludge in settling pond for treating water of low-turbidity micro-polluted water source |
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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 |
| 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 |
| 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 |
| CN110776072A (en) * | 2019-11-04 | 2020-02-11 | 甘肃省膜科学技术研究院有限公司 | Automatic control medicament recycling device for reducing dosage of water supply flocculant and coagulant aid |
| 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 |
| CN111777147A (en) * | 2020-07-17 | 2020-10-16 | 北京朗新明环保科技有限公司 | A grid flocculation sedimentation tank with diatomite added |
| CN112225346A (en) * | 2020-09-23 | 2021-01-15 | 华蓝设计（集团）有限公司 | Water purification method suitable for low-temperature and low-turbidity period |
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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 |
| 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 |
| 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 |
| CN105776735B (en) * | 2016-03-11 | 2018-08-21 | 山东建筑大学 | A kind of water purification new method of the different odor type organic removal of micro polluted source |
| 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 |
| 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 |
| 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 |
| CN110776072A (en) * | 2019-11-04 | 2020-02-11 | 甘肃省膜科学技术研究院有限公司 | Automatic control medicament recycling device for reducing dosage of water supply flocculant and coagulant aid |
| 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 |
| CN111777147A (en) * | 2020-07-17 | 2020-10-16 | 北京朗新明环保科技有限公司 | A grid flocculation sedimentation tank with diatomite added |
| CN112225346A (en) * | 2020-09-23 | 2021-01-15 | 华蓝设计（集团）有限公司 | Water purification method suitable for low-temperature and low-turbidity period |
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