CN102040294A - Treatment method for circulating water sewerage and reverse osmosis concentrated water - Google Patents
Treatment method for circulating water sewerage and reverse osmosis concentrated water Download PDFInfo
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- CN102040294A CN102040294A CN 200910180979 CN200910180979A CN102040294A CN 102040294 A CN102040294 A CN 102040294A CN 200910180979 CN200910180979 CN 200910180979 CN 200910180979 A CN200910180979 A CN 200910180979A CN 102040294 A CN102040294 A CN 102040294A
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Abstract
The invention relates to a treatment method for circulating water sewerage and reverse osmosis concentrated water, which is characterized in that the circulating water sewerage and the reverse osmosis concentrated water are treated in sequence as follows: the sewage is delivered into a coagulating basin; a coagulant and a coagulant aid are added so as to promote the agglomeration of colloidal solids, and subsequently, the sewage is delivered into a sedimentation basin for sedimentation and separation; then the sewage is filtered by a fiber filter; ozone and hydrogen peroxide are added for oxidation treatment; and the sewage is filtered by an active carbon filter. The chemical oxygen demand (COD) of the circulating water sewerage and the reverse osmosis concentrated water which are treated by the treatment method can meet the standard of exterior drainage, and the circulating water sewerage and the reverse osmosis concentrated water can be directly discharged to river channels.
Description
Technical field
The present invention relates to a kind of treatment process of sewer, the treatment process of particularly a kind of recirculated water sewer and reverse osmosis concentrated water.
Background technology
Along with carrying out in a deep going way of " water-saving and emission-reducing ", circulating water system generally adopts and adds acid control pH operation process at present, and the cycles of concentration of system is significantly improved, and has saved a large amount of fresh waters.But the improving constantly of cycles of concentration also brought bigger difficulty for the processing of recirculated water.This shows the increase of the water conditioning difficulty of circulating water system own on the one hand, shows also that on the other hand the sewer of circulating water system has been difficult to meet the standard that effluxes the river course.At present, the sewer COD of circulating water system exceeds standard becomes the major cause that the circulating water system sewer is difficult to efflux the river course.Organism in the recirculated water also comprises the material of leakage and the biological clay of generation sometimes mainly from the water quality stabilizer that adds.For adopting reuse water is the system of moisturizing, and organism also can directly be brought into by moisturizing.The recirculated water cycles of concentration increases, and blowdown flow rate reduces, and the residence time of all kinds of materials all prolongs thereupon in the water, and COD exceeds standard quite general in the petrochemical complex circulating water system.
In addition, reverse osmosis technology is the sixties in 20th century, efficient, the advanced embrane method water technology that grows up along with the development of mould material, reverse osmosis membrane technology has become the important means in industrial cycle water treatment, waste water recycling and the sea water desaltination field gradually.Reverse osmosis membrane technology dispose of sewage and the technology of reuse in, reverse osmosis unit is some concentrated water discharge still, this part discharge water is reverse osmosis concentrated water, impurity in the former water has obtained concentrating therein, and the COD of reverse osmosis concentrated water also substantially exceeds the emission standard of 60mg/L, and directly discharging can be to environment product disadvantageous effect.If dense water enters the sewage purification plant again when handling because the follow-up very big pressure of regeneration system water increase of purification plant is given in the higher meeting of saltiness, compare constantly " concentrate → desalination → concentrate → ... " process, the waste water that saltiness is bigger directly enters the river course after handling reduction COD, make its dilution and circulation of adding nature, the pressure of alleviating " desalination " and the benign cycle that ensures water are had positive meaning.
The ozone/hydrogen peroxide high-level oxidation technology is the advanced oxidation process of pollutent in a kind of effective degrading waste water, and this process does not produce secondary pollution, and the efficient height, can be CO with pollutant oxidation directly
2And H
2O.Yet using ozone/hydrogen peroxide high-level oxidation technology also has two key issues to need to solve at present: the one, and the ozone energy consumption is higher, and dosage is bigger; The 2nd, in water, have certain residually when the hydrogen peroxide dosage is too high, cause secondary pollution.
Chinese patent application CN 1693224A discloses O
3/ H
2O
2The water treatment method of the collaborative depulization of preoxidation and conventional water treatment process coagulant precipitation.This patent mainly is in order to remove microorganism, by ozone and hydrogen peroxide organism in water to be killed, and removes the biological corpse of dying by coagulation then, thereby but not removes the COD of organism degraded water sample in the water.Organism in the water than simple parasiticidal much more difficult, can't effectively reduce the COD and the turbidity of recirculated water sewer and reverse osmosis concentrated water because complicated component is very difficult during degraded with this method.U.S. Patent application US 5578205 discloses a kind of equipment that adopts the ozone/hydrogen peroxide oxidation to remove micropollutant from untreated water, and its shortcoming is not pass through the coagulant precipitation pre-treatment, and ozone is in state of saturation, and consumption is big.
Summary of the invention
The treatment process that the purpose of this invention is to provide a kind of recirculated water sewer and reverse osmosis concentrated water, method of the present invention is at COD and turbidity problem and propose, can effectively reduce the COD and the turbidity of recirculated water sewer and reverse osmosis concentrated water, reach the standard that directly effluxes.
For achieving the above object, the invention provides the method for a kind of recirculated water sewer and reverse osmosis concentrated water, in turn include the following steps:
A, recirculated water sewer and reverse osmosis concentrated water are sent into coagulation basin, add coagulating agent and coagulant aids, send into the settling tank precipitation then, separate to promote the cohesion of colloidal solid.
B, filter the water that a step obtains with fabric filter, quartz sand filtration device or more medium filter;
C, in the water that obtains through b step, add the ozone/hydrogen peroxide oxidation, reduce its COD to remove organism in the water;
D, the water that c step is obtained are sent into activated charcoal filter and are filtered.
The effect of coagulation basin of the present invention is by dosing coagulant and coagulant aids, and the suspended substance sedimentation in the water is removed.The disclosed coagulation basin of prior art all can be used for the present invention.Coagulating agent of the present invention and coagulant aids mix with water, described coagulating agent is Tai-Ace S 150, alum, Aluminum chloride anhydrous, crystallization aluminum chloride, ferrous sulfate, iron trichloride, bodied ferric sulfate, polyaluminium sulfate, polymerize aluminum chloride, polyaluminum sulfate iron(ic) chloride, polyaluminum sulfate ferric-aluminum chloride, polymerized ferric-aluminum chloride, preferred polymeric aluminum chloride, polyaluminium sulfate and polymerized ferric-aluminum chloride, most preferably polymerize aluminum chloride; The polymkeric substance of coagulant aids for being polymerized by acrylamide monomer is chosen as polyacrylamide (PAM), non-ionic polyacrylamide, cationic polyacrylamide, anionic polyacrylamide, preferred cationic polyacrylamide and anionic polyacrylamide.
The dosage of coagulating agent is 10～80mg/L, and the dosage of coagulant aids is 0.5～5mg/L, and water is 5～90min in the residence time of coagulation basin.
The effect of settling tank is to remove solid by natural subsidence, and the disclosed settling tank of prior art all can be used for the present invention.The surface load of settling tank of the present invention is 0.20～1.30m
3/ m
2.h, the residence time of water is 1～6h.
Coagulation basin and settling tank can be set to two independent ponds, and also the single equipment that coagulation and precipitation can be combined is a settling pond.
The disclosed fabric filter of prior art, quartz sand filtration device or more medium filter all can be used for the present invention.The filtrate of fabric filter of the present invention is fibrous bundle or fibrous nodules, and the filtrate of quartz sand filtration device is a quartz sand, and the filtrate of more medium filter can be quartz sand and coal etc.When suspended substance trickle in the sewage and colloidalmaterial during, can be dammed by strainer.Described fabric filter has the filtration efficiency height, floor space is little, back flushing is easy and water loss is little, be easy to realize advantages such as operation of equipment and convenient management, and the present invention preferably uses fabric filter.Filtering velocity 10～the 40m/h of strainer of the present invention.
After for some time, filter opening can be by obstructions such as suspended substances by above-mentioned strainer for recirculated water sewer and reverse osmosis concentrated water, and must handle this moment to filter bed, to remove tamper, generally adopts washing and/or air purge, and washing intensity is 2～20L/m
2.s, air purge intensity is 10～160L/m
2.s.
Macromole hardly degraded organic substance in the ozone/hydrogen peroxide one side oxidation water body makes it be degraded to low toxicity or nontoxic small-molecule substance, even directly is degraded into CO
2And H
2O is near permineralization.Be used for the preceding sterilization of gac on the one hand, prevent bacterial growth on gac, influence the use of gac.Ozone of the present invention can be provided by ozonizer, and the dosage of ozone is 0.5～1.8mg/L, and the hydrogen peroxide dosage is 3.0～8.0mg/L.
Step c of the present invention carries out in oxidation pond, and water is 0.5-2h in the residence time of oxidation pond.
The effect of activated charcoal filter is suspended substance, colourity and the peculiar smell in absorption and the removal water, and the disclosed activated charcoal filter of prior art all can be used for the present invention.The filtering velocity of activated charcoal filter of the present invention is 5～25m/h.
After for some time, filter opening can be by obstructions such as suspended substances by activated charcoal filter for recirculated water sewer and reverse osmosis concentrated water, and must handle this moment to filter bed, and to remove tamper, general employing washing is cleaned and/or air purge: washing intensity is 2～20L/m
2.s, air purge intensity is 10～80L/m
2.s.
Through recirculated water sewer and reverse osmosis concentrated water that method of the present invention is handled, its COD and turbidity can reach the standard of outer draining, can directly enter the river course.
Description of drawings
Accompanying drawing is the schema of recirculated water sewer of the present invention and reverse osmosis concentrated water treatment method.
Embodiment
Describe the present invention in detail below in conjunction with drawings and Examples, but do not limit to its scope.
Flow process shown in the drawings is a preferred embodiment of the treatment process of recirculated water sewer of the present invention and reverse osmosis concentrated water, recirculated water sewer and reverse osmosis concentrated water are sent into coagulation basin 2 after promoting by pump 1, in coagulation basin, add coagulating agent and coagulant aids to promote the cohesion of colloidal solid, send into settling tank 3 afterwards, after the natural subsidence, solid is discharged by outlet 4, supernatant liquid is sent into fabric filter 5, solid after the filtration is discharged by outlet 6, filtrate is sent into oxidation pond 7 by pipeline, in oxidation pond, add ozone and hydrogen peroxide oxidation, when filtrate enters activated charcoal filter 8 by pipeline, solid after activated charcoal filter filters is discharged by outlet 9, and supernatant liquid can directly enter the river course from exporting 10.
The COD of water quality
CrMeasuring method is potassium dichromate process GB11914-98;
Turbidity determination method spectrophotometry Q/SH 3155.S08.001-2006;
GB regulation: town B-grade sewage is handled first discharge standard COD and is lower than and is 60mg/L.
Embodiment 1
Adopt flow processing recirculated water sewer shown in the drawings and reverse osmosis concentrated water, its control condition is as follows:
Coagulation basin: add coagulating agent and coagulant aids, coagulating agent is a polymerize aluminum chloride, and dosage is 10mg/L, and coagulant aids adopts cationic polyacrylamide, and dosage is 1mg/L, and water is 30min in the residence time of coagulation basin.
Settling tank: surface load is 0.5m
3/ m
2.h, the residence time is 1h.
Fabric filter: filtrate is a fibrous bundle, and filtering velocity is 20m/h.
Oxidation pond: the residence time is 1h
Activated charcoal filter: filtering velocity is 15m/h.
Ozone/hydrogen peroxide is used for the sterilization before oxidation of organic compounds and the gac, and the ozone dosage is 0.5mg/L, and the hydrogen peroxide dosage is 3.0mg/L, and result sees Table 1.
Table 1 embodiment 1 result
Adopt flow processing recirculated water sewer shown in the drawings and reverse osmosis concentrated water, its control condition is as follows:
Coagulation basin: add coagulating agent and coagulant aids, coagulating agent is a polymerize aluminum chloride, and dosage is 10mg/L, and coagulant aids adopts cationic polyacrylamide, and dosage is 1mg/L, and water is 30min in the residence time of coagulation basin.
Settling tank: surface load is 0.5m
3/ m
2.h, the residence time is 1h.
Fabric filter: filtrate is a fibrous bundle, and filtering velocity is 20m/h.
Oxidation pond: the residence time is 1h.
Activated charcoal filter: filtering velocity is 15m/h.
Ozone/hydrogen peroxide is used for the sterilization before oxidation of organic compounds and the gac, and the ozone dosage is 1.0mg/L, and the hydrogen peroxide dosage is 5.0mg/L, and result sees Table 2.
Table 2 embodiment 2 results
Adopt flow processing recirculated water sewer shown in the drawings and reverse osmosis concentrated water, its control condition is as follows:
Coagulation basin: add coagulating agent and coagulant aids, coagulating agent is a polymerize aluminum chloride, and dosage is 10mg/L, and coagulant aids adopts cationic polyacrylamide, and dosage is 1mg/L, and water is 30min in the residence time of coagulation basin.
Settling tank: surface load is 0.5m
3/ m
2.h, the residence time is 1h.
Fabric filter: filtrate is a fibrous bundle, and filtering velocity is 20m/h.
Oxidation pond: the residence time is 1h.
Activated charcoal filter: filtering velocity is 15m/h.
Ozone/hydrogen peroxide is used for the sterilization before oxidation of organic compounds and the gac, and the ozone dosage is 1.8mg/L, and the hydrogen peroxide dosage is 8.0mg/L, and result sees Table 3.
Table 3 embodiment 3 results
Comparative Examples 1
Save coagulation basin, settling tank, fabric filter and activated charcoal filter in the accompanying drawing, only adopt ozone/hydrogen peroxide oxidizing process cycle of treatment water sewer and reverse osmosis concentrated water, its control condition is with embodiment 1, and result sees Table 4.
Table 4 Comparative Examples 1 result
Comparative Examples 2
Save coagulation basin, settling tank, fabric filter and activated charcoal filter in the accompanying drawing, only adopt ozone/hydrogen peroxide oxidizing process cycle of treatment water sewer and reverse osmosis concentrated water, its control condition is with embodiment 2, and result sees Table 5.
Table 5 Comparative Examples 2 results
Comparative Examples 3
Save coagulation basin, settling tank, fabric filter and activated charcoal filter in the accompanying drawing, only adopt ozone/hydrogen peroxide oxidizing process cycle of treatment water sewer and reverse osmosis concentrated water, its control condition is with embodiment 3, and result sees Table 6.
Table 6 Comparative Examples 3 results
Comparative Examples 4
Oxidation pond in the accompanying drawing is carried to mixing before the pond, adopted the flow processing recirculated water sewer and the reverse osmosis concentrated water of coagulation behind the initial oxidation, sedimentation, filtration, charcoal absorption, its control condition is with embodiment 1.Result sees Table 7.
Table 7 Comparative Examples 4 results
Comparative Examples 5
Oxidation pond in the accompanying drawing is carried to mixing before the pond, and saved activated charcoal filter, adopt coagulation behind the initial oxidation, sedimentation, filtering flow processing recirculated water sewer and reverse osmosis concentrated water, its control condition is with embodiment 1, and result sees Table 8.
Table 8 Comparative Examples 5 results
Comparative Examples 6
Save coagulation basin, settling tank and fabric filter in the accompanying drawing, only adopt ozone/hydrogen peroxide oxidizing process and activated charcoal filter cycle of treatment water sewer and reverse osmosis concentrated water, its control condition is as follows:
Oxidation pond: the residence time is 1h, and the ozone dosage is 36.8mg/L, and the hydrogen peroxide dosage is 53.7mg/L.
Activated charcoal filter: filtering velocity is 15m/h.Result sees Table 9.
Table 9 Comparative Examples 6 results
The data declaration of the foregoing description and Comparative Examples: method of the present invention is specially adapted to recirculated water sewer and the reverse osmosis concentrated water that COD exceeds standard, and have only through first coagulant precipitation, back ozone/hydrogen peroxide oxidation, cooperate step such as charcoal absorption again, just can effectively reduce the COD and the turbidity of sewage, and ozone and hydrogen peroxide dosage are little.Recirculated water sewer and the reverse osmosis concentrated water handled through the inventive method can directly enter the river course.
Claims (9)
1. the treatment process of recirculated water sewer and reverse osmosis concentrated water in turn includes the following steps:
A, recirculated water sewer and reverse osmosis concentrated water are sent into coagulation basin, add coagulating agent and coagulant aids, send into the settling tank precipitation then, separate to promote the cohesion of colloidal solid.
B, filter the water that a step obtains with fabric filter, quartz sand filtration device or more medium filter;
C, in the water that obtains through b step, add the ozone/hydrogen peroxide oxidation, reduce its COD to remove organism in the water;
D, the water that c step is obtained are sent into activated charcoal filter and are filtered.
2. according to the treatment process of described recirculated water sewer of claim 1 and reverse osmosis concentrated water, it is characterized in that coagulating agent is Tai-Ace S 150, alum, Aluminum chloride anhydrous, crystallization aluminum chloride, ferrous sulfate, iron trichloride, bodied ferric sulfate, polyaluminium sulfate, polymerize aluminum chloride, polyaluminum sulfate iron(ic) chloride, polyaluminum sulfate ferric-aluminum chloride or polymerized ferric-aluminum chloride; The polymkeric substance of coagulant aids for being polymerized by acrylamide monomer.
3. according to the treatment process of described recirculated water sewer of claim 2 and reverse osmosis concentrated water, it is characterized in that coagulating agent is polymerize aluminum chloride, polyaluminium sulfate or polymerized ferric-aluminum chloride; Coagulant aids is polyacrylamide, non-ionic polyacrylamide, cationic polyacrylamide or anionic polyacrylamide.
4. according to the treatment process of described recirculated water sewer of claim 3 and reverse osmosis concentrated water, it is characterized in that coagulating agent is a polymerize aluminum chloride; Coagulant aids is cationic polyacrylamide or anionic polyacrylamide.
5. according to the treatment process of each described recirculated water sewer of claim 1-4 and reverse osmosis concentrated water, the dosage that it is characterized in that coagulating agent is 10～80mg/L, the dosage of coagulant aids is 0.5～5mg/L, water is 5～90min in the residence time of coagulation basin, and the settling tank surface load is 0.20～1.30m
3/ m
2.h, the residence time of water is 1～6h.
6. according to the treatment process of each described recirculated water sewer of claim 1-5 and reverse osmosis concentrated water, it is characterized in that b in the step filter device therefor be fabric filter, filtering velocity is 10～40m/h.
7. according to the treatment process of each described recirculated water sewer of claim 1-6 and reverse osmosis concentrated water, the dosage that it is characterized in that ozone is 0.5～1.8mg/L, and the hydrogen peroxide dosage is 3.0～8.0mg/L.
8. according to the treatment process of described recirculated water sewer of claim 7 and reverse osmosis concentrated water, it is characterized in that step c carries out in oxidation pond, water is 0.5-2h in the residence time of oxidation pond.
9. according to the treatment process of each described recirculated water sewer of claim 1-8 and reverse osmosis concentrated water, it is characterized in that water is 5～25m/h in the filtering velocity of activated charcoal filter.
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| CN102627364A (en) * | 2012-04-17 | 2012-08-08 | 南京丹恒科技有限公司 | Process flow for recycling and treating reverse osmosis concentrated water |
| CN103030227A (en) * | 2011-09-29 | 2013-04-10 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2698349B1 (en) * | 1992-11-24 | 1995-06-09 | Trailigaz | INSTALLATION FOR THE REMOVAL OF MICRO-POLLUTANTS FROM RAW WATER, PARTICULARLY DRILLING WATER, BY COMBINED ACTION OF OZONE AND HYDROGEN PEROXIDE. |
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| CN104108813A (en) * | 2014-07-17 | 2014-10-22 | 中国石油天然气股份有限公司 | Refining sewage desalination integrated treatment process and device |
| CN104108813B (en) * | 2014-07-17 | 2016-06-08 | 中国石油天然气股份有限公司 | Refining sewage desalination integrated treatment process and device |
| CN105110528A (en) * | 2015-08-18 | 2015-12-02 | 中国电力工程顾问集团中南电力设计院有限公司 | Phosphorus removal method for circulating water and blowdown water in power system |
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