CN102452767A - Method for treating and recycling city reclaimed water - Google Patents
Method for treating and recycling city reclaimed water Download PDFInfo
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- CN102452767A CN102452767A CN2010105192175A CN201010519217A CN102452767A CN 102452767 A CN102452767 A CN 102452767A CN 2010105192175 A CN2010105192175 A CN 2010105192175A CN 201010519217 A CN201010519217 A CN 201010519217A CN 102452767 A CN102452767 A CN 102452767A
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Abstract
The invention relates to a method for treating and recycling city reclaimed water. The method comprises the following steps: sequentially carrying out chemical oxidation, sedimentation, biological aerated filter, sterilization, filtration and reverse osmosis on the city reclaimed water, wherein in the chemical oxidation step, the addition of an oxidizer is 2-200mg/L; and in the sedimentation step, the sedimentation time is not less than 8 hours. The city reclaimed water treated by the method in the invention can be used as compensation water of boiler water; and after being treated by the method provided by the invention, the city reclaimed water with salt content exceeding the recirculated water index can be used as compensation water for recirculated cooling water.
Description
Technical field
The present invention relates to the processing and the reuse method of municipal middle water.
Background technology
The water quality of middle water is that municipal effluent, waste water are up to state standards after purifying treatment between sewage and tap water, the undrinkable water that can use within the specific limits.Wherein, municipal middle water has that the water yield is big, water conditioning, from the horse's mouth, the characteristics that do not need long distance water diversion, is a kind of regenerated water source of sustainable use.
As water rich and influential family's industrial enterprise, the water loss of recirculated cooling water and BW is huge, water resources ubiquity breach.With being back to recirculated cooling water or BW after city " middle water " processing; Can solve the insufficient problem of industrial enterprise's water resources, improve the water resources repeating utilization factor and reduce sewage emissions; Have huge social benefit and good economic benefit, therefore also paid attention to greatly and extensive studies.
ZL 03139046.3 has proposed the deep treatment method of a kind of municipal middle water as industrial circulating cooling water.CN 101318747A has proposed a kind of power plant and has used the municipal middle water deep treatment method.Above treatment process main purpose is to remove impurity such as the turbidity of municipal middle water, suspended substance, can't remove the inorganic salt in the municipal middle water, therefore can't be used as BW.Many areas, particularly coastland of China, the salts contg of municipal middle water is higher, and specific conductivity is higher than the reuse index of following water coolant generally greater than 1200 μ S/cm, as adopts above-mentioned treatment process, and this part municipal middle water can't be back to recirculated cooling water.
R-o-is a kind of effective desalting technology, but reverse osmosis membrane is to the having relatively high expectations of influent quality, and requires COD content in the waste water less than below the 30mg/L usually, so municipal middle water need carry out could satisfying after the pre-treatment water inlet requirement of reverse osmosis membrane.Conventional feed water by reverse osmosis pretreatment technology comprises steps such as biochemical treatment, sterilization and filtration, according to the difference of biochemical processing process, as adopting activated sludge process, also need comprise precipitation step.
Summary of the invention
To the problem that exists in the prior art, the invention provides a kind of treatment process of municipal middle water, municipal middle water can be used as industrial circulating cooling water make up water or BW make up water after this method is handled.
A kind of treatment process of municipal middle water comprises the municipal middle water order is carried out chemical oxidation, sedimentation, BAF, sterilization, filtration and r-o-; In the chemical oxidation step, the add-on of oxygenant is 2-200mg/L; In the precipitation step, settling time >=8 hour.
Reuse method after a kind of municipal middle water is handled mixes waste water after the filtration treatment and the waste water after the reverse-osmosis treated, makes and mixes the requirement that electrical conductivity of water meets the recirculated cooling water make up water, then as the recirculated cooling water make up water.
The present invention also provides the reuse method after another kind of municipal middle water is handled, and the waste water after the reverse-osmosis treated is used as the BW make up water.
Compared with prior art, the present invention has following advantage:
1. the organic removal rate of routine biochemistry technology has only about 30%.The present invention adopts chemical oxidation and sedimentation earlier, adopts biochemical technology that municipal middle water is handled again, and organic removal rate can reach more than 50%, and effect is remarkable.The present invention has increased precipitation step after the chemical oxidation step, not only can remove the impurity of non-solubility in the waste water, stablizes the water supply quality of subsequent step, and can avoid the disadvantageous effect of chemical oxidizing agent to follow-up biochemical action.
2. municipal middle water can be used as the BW make up water after the inventive method is handled, and has enlarged the use range of middle water.Surpass the municipal middle water of reuse recirculated cooling water index for salts contg, adopt method of the present invention to handle after, can be back to following cooling water system.
3. municipal middle water is after the present invention handles, and can improve the cycles of concentration of following cooling water system, conserve water resource as following water coolant make up water.
4. method cost of the present invention is lower.
Embodiment
Below set forth in detail the present invention.
(1) municipal middle water that comes out from municipal wastewater treatment plant at first carries out chemical oxidation treatment; Promptly in waste water, add the COD that a certain amount of oxygenant also can be eliminated the bacterium in the waste water with the colourity in the elimination waste water, peculiar smell and reduce waste water, can improve the biodegradability of waste water simultaneously.Used oxygenant can be one or more of hypochlorite, chlorine, dioxide peroxide, chlorinated isocyanurates and chlorinated isocyanurates salt, preferred Youxiaolin.The dosage of oxygenant is 2-200mg/L, is preferably 5-50mg/L.
(2) waste water after step (1) is handled carries out sedimentation and handles, and settling time>=8 hour are preferred>=24 hours; Consider from economic rationality, settling time≤240 hour, preferred≤120 hours.The described settling time is meant the residence time of waste water in sedimentation device, and during like the operation of employing continuous mode, the described settling time is meant the inverse of volume space velocity.Waste water can be removed non-solubility impurity wherein after carrying out the sedimentation processing.Waste water stops the disadvantageous effect that time enough can avoid oxygenant that follow-up biological process is produced in sedimentation device.
(3) waste water after step (2) is handled enters into BAF and carries out biochemical treatment with impurity such as the COD that removes waste water, ammonia nitrogen, suspended substances.
(4) waste water after step (3) is handled adds sterilizing agent and carries out sterilization, disinfects.Sterilant can be one or more in hypochlorite, chlorine, dioxide peroxide, chlorinated isocyanurates, chlorinated isocyanurates salt, ozone, ydrogen peroxide 50, bromine water, hypobromite, quaternary ammonium salt and the quaternary alkylphosphonium salt, preferred trichloroisocyanuric acid and/or Surchlor GR 60; The dosage of sterilant can be 2-200mg/L, preferred 5-50mg/L.
(5) waste water after step (4) processing is filtered.After filtering mode is preferably the cascade filtration processing.Described cascade filtration can be the combination of various filter types of the prior art, preferred sand filtration+multi-medium filtering.
(6) waste water after step (5) is filtered gets into and carries out the reverse osmosis desalination processing in the reverse osmosis system.R-o-belongs to prior art, and those of ordinary skills can be easy to select suitable device and operational condition according to the water quality situation.
Under the preferred situation, the waste water after step (5) filtration treatment is introduced into an intermediate pool, and then carries out reverse osmosis desalination in the entering reverse osmosis system and handle.The residence time of intermediate pool is 0.5-6 hour, preferred 1-4 hour.The described residence time is meant the inverse of volume space velocity.The impact of the fluctuation that can avoid water quality and quantity of intermediate pool to reverse osmosis system and circulating water system is set.
Below through combining embodiment to further specify the present invention, the ppm among the embodiment is a weight ratio.
Embodiment 1
Certain city's municipal middle water of south is handled back reuse refinery.The municipal middle water water yield is 400m
3/ h adopts chemical oxidation-sedimentation-biochemical treatment-sterilization-filtration-ro treatment technology to handle; It is oxygenant that chemical oxidation unit adopts Youxiaolin, and dosage is 10ppm; Waste water is 60 hours in the time of slurry tank in the sedimentation unit; Biochemical unit adopts BAF to handle, and hydraulic detention time is 2 hours; Disinfection unit adopts chlorinated isocyanurates to make sterilant, and adding concentration is 10ppm; Filter and adopt sand filtration and multimedium two-stage filtration; Waste water is 3 hours in the residence time of intermediate pool; The employing two-pass reverse osmosis is handled; The water quality of waste water is seen table 1 before and after handling.
Handle after-filtration water outlet 100m
3/ h and r-o-water outlet 100m
3/ h mixes the back as the recirculated cooling water make up water, r-o-water outlet 125m
3/ h is as the BW make up water, reverse osmosis concentrated water 75m
3/ h directly discharges.
Comparative Examples
Do not adopt the municipal middle water pretreatment process among the present invention, and adopt conventional BAF-flocculation sediment-filtration-sterilization pretreatment process to handle above-mentioned municipal middle water, wherein the unitary hydraulic detention time of BAF is 3 hours; Adopting Poly aluminum Chloride (PAC) in the flocculation sediment unit is flocculation agent, and dosage is 20ppm, and hydraulic detention time is 1 hour; Filtering unit adopts sand filtration and multimedium two-stage filtration; Disinfection unit adopts chlorinated isocyanurates to make sterilant, and adding concentration is 10ppm.Water quality before and after handling is seen table 2.Can find out from the data of table 2, adopt municipal middle water COD after above-mentioned conventional municipal middle water treatment process is handled, not satisfy the into water quality requirement of reverse osmosis system, can't adopt r-o-to carry out desalting treatment greater than 30mg/L.
Embodiment 2
Certain city's municipal middle water of the north is handled back reuse petrochemical plant.The municipal middle water water yield is 600m
3/ h adopts chemical oxidation-sedimentation-biochemical treatment-sterilization-filtration-ro treatment technology to handle; It is oxygenant that chemical oxidation unit adopts chlorinated isocyanurates, and dosage is 10ppm; Waste water is 48 hours in the time of slurry tank in the sedimentation unit; Biochemical unit adopts BAF to handle, and hydraulic detention time is 2 hours; Disinfection unit adopts chlorine to make sterilant, and adding concentration is 5ppm; Filter and adopt sand filtration and multimedium two-stage filtration; Waste water is 2 hours in the residence time of intermediate pool; Adopt three grades of reverse-osmosis treated; The water quality of waste water is seen table 3 before and after handling.
Handle after-filtration water outlet 200m
3/ h is as circulating water system, r-o-water outlet 300m
3/ h is as the make up water of BW, reverse osmosis concentrated water 100m
3/ h directly discharges.
Table 1
Table 2
Table 3
Claims (12)
1. the treatment process of a municipal middle water comprises the municipal middle water order is carried out chemical oxidation, sedimentation, BAF, sterilization, filtration and r-o-; In the chemical oxidation step, the add-on of oxygenant is 2-200mg/L; In the precipitation step, settling time >=8 hour.
2. according to the described method of claim 1, it is characterized in that described oxygenant is one or more of hypochlorite, chlorine, dioxide peroxide, chlorinated isocyanurates and chlorinated isocyanurates salt.
3. according to the described method of claim 1, it is characterized in that in the chemical oxidation step, the dosage of oxygenant is 5-50mg/L.
4. according to the described method of claim 1, it is characterized in that, in the precipitation step, settling time >=24 hour.
5. according to the described method of claim 1; It is characterized in that; In the sterilisation step, sterilant is one or more in hypochlorite, chlorine, dioxide peroxide, chlorinated isocyanurates, chlorinated isocyanurates salt, ozone, ydrogen peroxide 50, bromine water, hypobromite, quaternary ammonium salt and the quaternary alkylphosphonium salt.
6. according to the described method of claim 1, it is characterized in that in the sterilisation step, the dosage of sterilant is 2-200mg/L.
7. according to the described method of claim 1, it is characterized in that in the sterilisation step, the dosage of sterilant is 5-50mg/L.
8. according to the described method of claim 1, it is characterized in that, in the filtration step, adopt the cascade filtration mode of sand filtration and multi-medium filtering.
9. according to the described method of claim 1, it is characterized in that the waste water after the filtration treatment is introduced into intermediate pool, and then carry out reverse osmosis desalination in the entering reverse osmosis system and handle.
10. according to the described method of claim 9, it is characterized in that the residence time of intermediate pool is 0.5-6 hour.
11. the reuse method after a municipal middle water is handled mixes waste water after the filtration treatment in the claim 1 and the waste water after the reverse-osmosis treated, makes and mixes the requirement that electrical conductivity of water meets the recirculated cooling water make up water, then as the recirculated cooling water make up water.
12. the reuse method after a municipal middle water is handled is used as the BW make up water with the waste water after the reverse-osmosis treated in the claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105192175A CN102452767A (en) | 2010-10-26 | 2010-10-26 | Method for treating and recycling city reclaimed water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105192175A CN102452767A (en) | 2010-10-26 | 2010-10-26 | Method for treating and recycling city reclaimed water |
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| CN102452767A true CN102452767A (en) | 2012-05-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845047A (en) * | 2019-12-13 | 2020-02-28 | 深圳市能源环保有限公司 | Reclaimed water softening and recycling treatment system and method suitable for waste incineration power plant |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2801776Y (en) * | 2005-06-08 | 2006-08-02 | 李文彬 | Intermediate water treatment system |
| CN101108763A (en) * | 2006-07-18 | 2008-01-23 | 中蓝膜技术有限公司 | Advanced process method for petrifaction sewage |
| CN101318747A (en) * | 2008-07-17 | 2008-12-10 | 山东电力研究院 | Advanced treatment method for urban water of electric power plant |
| CN101343132A (en) * | 2008-08-28 | 2009-01-14 | 杭州水处理技术研究开发中心有限公司 | Treatment method for wastewater of polyvinyl chloride (PVC) anticentripetal mother solution |
-
2010
- 2010-10-26 CN CN2010105192175A patent/CN102452767A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2801776Y (en) * | 2005-06-08 | 2006-08-02 | 李文彬 | Intermediate water treatment system |
| CN101108763A (en) * | 2006-07-18 | 2008-01-23 | 中蓝膜技术有限公司 | Advanced process method for petrifaction sewage |
| CN101318747A (en) * | 2008-07-17 | 2008-12-10 | 山东电力研究院 | Advanced treatment method for urban water of electric power plant |
| CN101343132A (en) * | 2008-08-28 | 2009-01-14 | 杭州水处理技术研究开发中心有限公司 | Treatment method for wastewater of polyvinyl chloride (PVC) anticentripetal mother solution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845047A (en) * | 2019-12-13 | 2020-02-28 | 深圳市能源环保有限公司 | Reclaimed water softening and recycling treatment system and method suitable for waste incineration power plant |
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Application publication date: 20120516 |