CN102674585B - Combined enhanced treatment process for low-turbidity high-alga raw water - Google Patents

Combined enhanced treatment process for low-turbidity high-alga raw water Download PDF

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Publication number
CN102674585B
CN102674585B CN201110060414.XA CN201110060414A CN102674585B CN 102674585 B CN102674585 B CN 102674585B CN 201110060414 A CN201110060414 A CN 201110060414A CN 102674585 B CN102674585 B CN 102674585B
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water
turbidity
sedimentation tank
treatment
algae
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CN102674585A (en
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许嘉炯
金晓云
郑志民
郑国兴
邬亦俊
雷挺
范玉柱
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Abstract

The invention discloses a combined enhanced treatment process for low-turbidity high-alga raw water. The treatment process is characterized in that according to raw water, the turbidity in winter is about 5NTU, and temperature less than 5 DEG C, or one liter of raw water contains more than one million algae in summer, and the treatment process comprises the following steps of: settling under the conventional condition by using a flocculation horizontal sedimentation tank or a high-efficiency sedimentation tank, performing air floatation by using an air floatation tank to remove algae, allowing outlet water to flow through an ultra filter membrane further to reduce turbidity and remove algae, adjusting storage by using a clear water tank, and feeding into a water distribution network by using a water feeding pump house. According to the low-turbidity and high-alga characteristics of the water quality of the raw water, the conventional coagulating sedimentation, air floatation, filter and ultra filtration processes are optimized and combined, and the utilization of geothermal resources of plant areas is fully considered, so that an enhanced conventional treatment system is formed. The combined process has the advantages that used land can be saved, the process can be optimized, the geothermal resources can be fully utilized, the production management can be simplified, and the water quality of the outlet water has obvious advantages.

Description

Low turbid algae concentrated feeding water combination strengthening treatment process
Technical field
The present invention is a kind of water treatment combination reinforcing process related in water supply engineering, specifically low turbid algae concentrated feeding water combines a strengthening treatment process, for the low turbid and efficient target processed of height algae employing combination strengthening conventional processing realization in summer of former water winter low temperature.
Background technology
China's surface water quality differs greatly, wherein with the intractability of lake and the large reservoir low turbid algae concentrated feeding water that is representative not second to high ammonia nitrogen and high organism micro polluted source.Low turbid period in winter coagulating sedimentation weak effect, cause settling tank delivery turbidity sometimes even higher than influent turbidity, increase the weight of the burden of filtration process; Algae during summer height algae in former water cannot be removed completely by precipitation and air-float technology, causes filter material surface blocking and filtering layer to penetrate, cause algae to enter clear-water reservoir and pipe network after entering filter tank.
At present, general conventional treatment process is adopted as the waterworks of drinking water source for low turbid algae concentrated feeding water, when winter turbidity at about 5NTU and temperature lower than 5 DEG C, summer algae more than 1,000,000/when rising, be difficult to reach new effluent water quality standard, need to carry out the measure of combination strengthening conventional processing.Recently along with the raising of water quality standard for drinking water, in some areas, output water turbidity day by day comes into one's own as the Con trolling index that Drinking water quality is important, turbidity requires to carry to below 0.1NTU by Zhejiang Province's modern water factory standard, and existing process combination will reach so high water outlet and require that difficulty is higher.
Summary of the invention
The object of this invention is to provide a kind of low turbid algae concentrated feeding water combination strengthening treatment process, be suitable for winter turbidity at about 5NTU and temperature lower than 5 DEG C, the low turbid algae concentrated feeding water treatment process of algae in summer more than 1,000,000/liter, the factors such as algae, turbidity and temperature variation that solve are on the impact of whole art breading effect.
To achieve these goals, technical scheme of the present invention is: a kind of low turbid algae concentrated feeding water combination strengthening treatment process, it is characterized in that when former water turbidity in winter at about 5NTU and temperature lower than under 5 DEG C or the normal condition of algae in summer more than 1,000,000/liter, treatment process comprises: first adopt flocculation and sedimentation tank or efficient sedimentation tank to precipitate, then air flotation pool air floatation alga removing is used, water outlet removes turbidity and algae further by ultra-filtration membrane group, then sends into the distribution system of water supply by Water-supply station after being regulated and stored by clean water basin.At raw water turbidity higher or precipitation outlet effect is poor time, can after air flotation pool air floatation alga removing, filter through homogeneous filtering material air-water backwashing sand filter or cartridge filter, then remove turbidity and algae further by ultra-filtration membrane group.In order to improve treatment effect, in the low turbid original sub-block technique of winter low temperature, first former water is heated, coagulating kinetics effect is improved by improving water temperature, concrete treatment process comprises: former water enters flocculation and sedimentation tank after first improving water temperature by heat riser or efficient sedimentation tank precipitates, then precipitate water outlet and remove turbidity and algae further by ultra-filtration membrane group, water outlet sends into the distribution system of water supply by Water-supply station after being regulated and stored by clean water basin.When plant area has geothermal energy resources to utilize, underground heat temperature elevation system is set, directly adopts underground heat to heat former water.
The characteristic that the present invention is directed to the low turbid high algae of raw water quality is optimized combination to conventional coagulating sedimentation, air supporting, filtration and ultrafiltration technology, and take into full account that plant area's geothermal energy resources utilize, form strengthening conventional processing system, have more complete than existing technique and dispatch film pre-treating technology flexibly, guaranteeing that under effluent quality condition, working cost is more economized.The advantage of this combination process is to save the area, and Optimizing Flow, makes full use of geothermal energy resources, simplifies production management, and to guaranteeing that effluent quality has obvious advantage.
Accompanying drawing explanation
Fig. 1 is the low turbid algae concentrated feeding water treatment process schematic diagram of normal condition of the present invention.
Fig. 2 is for utilizing process modification schematic diagram under geothermal energy resources condition.
Fig. 3 is underground heat temperature elevation system schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The present invention is a kind of low turbid algae concentrated feeding water combination strengthening treatment process.Under general condition, former water 1 first adopts flocculation and sedimentation tank 2 or efficient sedimentation tank 3 to precipitate, then air flotation pool 4 air floatation alga removing is used, water outlet removes turbidity and algae further by ultra-filtration membrane group 7, then sends into the distribution system of water supply 10 by Water-supply station 9 after being regulated and stored by clean water basin 8.At raw water turbidity higher or precipitation outlet effect poor time, can after air flotation pool 4 air floatation alga removing, filter through homogeneous filtering material air-water backwashing sand filter 5 or cartridge filter 6, remove turbidity and algae further by ultra-filtration membrane group 7 again, water outlet sends into the distribution system of water supply 10 by Water-supply station 9 after being regulated and stored by clean water basin 8.In the winter time, in order to improve treatment effect, heating unit can be added before flocculation and sedimentation tank 2 or efficient sedimentation tank 3, when plant area has geothermal energy resources to utilize, underground heat temperature elevation system 11 is set, direct employing underground heat heats former water, if not, can heat former water by other means.Concrete treatment process can be optimized for: the first logical heating of former water enters flocculation and sedimentation tank 2 after improving water temperature to 5 ~ 15 DEG C or efficient sedimentation tank 3 precipitates, then air flotation pool 4 air floatation alga removing is used, then homogeneous filtering material air-water backwashing sand filter 5 is entered or cartridge filter 6 filters, remove turbidity and algae further by ultra-filtration membrane group 7 again, water outlet sends into the distribution system of water supply 10 by Water-supply station 9 after being regulated and stored by clean water basin 8.Certainly, also can surmount air flotation pool 4 and homogeneous filtering material air-water backwashing sand filter 5 or cartridge filter 6 when raw water turbidity is lower or precipitation outlet effect is better, directly precipitation water outlet be accessed ultra-filtration membrane group 7 and process.
In process combination, chlorine or dioxide peroxide 12 is added before flocculation and sedimentation tank 2 or efficient sedimentation tank 3, potassium permanganate (composite salt) 13, powder activated carbon 14, alum 15 and the general potassium permanganate of coagulant aids 16(and the visual raw water quality test of powder activated carbon determine the need of adding, all the other medicaments all need to add, with reference to adding pharmaceutical quantities: the dosage of chlorine is about 2mg/l, the dosage of dioxide peroxide is about 1mg/l, the dosage about 1 ~ 2mg/l of potassium permanganate, the dosage about 5 ~ 10mg/l of powder activated carbon, the dosage about 20 ~ 30mg/l of alum, coagulant aids can adopt PAM, dosage is 0.1 ~ 0.2mg/l about), add flocculating aids 17(flocculating aids before homogeneous filtering material air-water backwashing sand filter 5 or cartridge filter 6 and can adopt polymerize aluminum chloride, dosage is 3 ~ 5mg/l about), chlorine is added or dioxide peroxide 12 is sterilized before clean water basin 8.(the dosage about 2 ~ 3mg/l of chlorine, the dosage about 1 ~ 2mg/l of dioxide peroxide).
When plant area has geothermal energy resources to utilize, underground heat temperature elevation system by water inlet pipe 18, heat exchanger tube 19, rising pipe 20, water inlet shutdown valve 21, water outlet shutdown valve 22, rinse water intaking valve 23 and flush out water valve 24 and form.Concrete structure is: this underground heat temperature elevation system comprises the multichannel heat exchanger tube 19 being embedded in underground, one end of this multichannel heat exchanger tube 19 is connected with water inlet pipe 18, the other end of this multichannel heat exchanger tube is connected to flocculation and sedimentation tank or efficient sedimentation tank by rising pipe 20, a shutdown valve 21 of intaking is provided with between water inlet pipe 18 and each road heat exchanger tube 19, a water outlet shutdown valve 22 is provided with between rising pipe 20 and each road heat exchanger tube 19, one end of each road heat exchanger tube 19 connects impressed pressure water by rinsing water intaking valve 23, the other end of each road heat exchanger tube 19 is established and is flushed out water valve 24 draining.Mode of operation is: settling tank water outlet is divided into multichannel heat exchanger tube 19 on water inlet pipe 18, and heat exchanger tube 19 is imbedded underground and fully absorbed water temperature in underground heat raising pipe, enters follow-up flocculation and sedimentation tank 2 or efficient sedimentation tank 3 after being collected by rising pipe 20; When single heat exchanger tube 19 need rinse, close water inlet shutdown valve 21 and water outlet shutdown valve 22, open to rinse water intaking valve 23 and flush out water valve 24 and carry out rinsing and draining with impressed pressure water.
All the other flocculation and sedimentation tank, efficient sedimentation tank, air flotation pool, homogeneous filtering material air-water backwashing sand filter, cartridge filter, ultra-filtration membrane group, clean water basin and Water-supply station are prior art, no longer describe in detail.

Claims (4)

1. one kind low turbid algae concentrated feeding water combination strengthening treatment process, it is characterized in that when former water turbidity in winter at about 5NTU and temperature lower than under the normal condition of 5 DEG C, treatment process comprises: former water enters flocculation and sedimentation tank after first improving water temperature by heat riser or efficient sedimentation tank precipitates, then air flotation pool air floatation alga removing is used, water outlet removes turbidity and algae further by ultra-filtration membrane group, the distribution system of water supply is sent into by Water-supply station after being regulated and stored by clean water basin again, heat riser is underground heat temperature elevation system, directly adopts underground heat to heat former water.
2. technique as claimed in claim 1, after it is characterized in that air flotation pool air floatation alga removing, after being filtered by homogeneous filtering material air-water backwashing sand filter or cartridge filter, then is accessed ultra-filtration membrane group and processes.
3. technique as claimed in claim 2, it is characterized in that this underground heat temperature elevation system comprises the multichannel heat exchanger tube being embedded in underground, one end of this multichannel heat exchanger tube is connected with water inlet pipe, and the other end of this multichannel heat exchanger tube is connected to flocculation and sedimentation tank or efficient sedimentation tank by rising pipe.
4. technique as claimed in claim 2, adds chlorine or dioxide peroxide, potassium permanganate, powder activated carbon, alum and coagulant aids before it is characterized in that flocculation and sedimentation tank or efficient sedimentation tank; Flocculating aids is added before homogeneous filtering material air-water backwashing sand filter or cartridge filter; Chlorine or disinfection by chlorine dioxide is added before clean water basin.
CN201110060414.XA 2011-03-14 2011-03-14 Combined enhanced treatment process for low-turbidity high-alga raw water Active CN102674585B (en)

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CN102976555A (en) * 2012-11-30 2013-03-20 徐州工程学院 Integrated air floatation-membrane bioreactor
CN103523967A (en) * 2013-11-05 2014-01-22 哈尔滨工业大学 Method for treating short-flow water with sedimentation and air-floating coupling as core
CN106587503A (en) * 2016-12-16 2017-04-26 北京桑德环境工程有限公司 Drinking water combination treatment system and method for treating light-pollution high-turbidity surface water source
CN108423765A (en) * 2018-03-13 2018-08-21 常州大学 A kind of method of algae in removal eutrophication water
CN110776194B (en) * 2019-10-12 2021-01-19 西安交通大学 Wastewater treatment system and method based on ecological water treatment coupling geothermal energy

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CN101921008A (en) * 2010-09-25 2010-12-22 哈尔滨工业大学 Water treatment device integrating functions of clarification, air flotation and ultrafiltration

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"气浮/超滤组合工艺处理微污染高藻原水";王占金等;《中国给水排水》;20100630;第26卷(第11期);第133-135、138页 *

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