CN1338433A - Method for using treated sewage in circulating water system - Google Patents
Method for using treated sewage in circulating water system Download PDFInfo
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- CN1338433A CN1338433A CN 00121550 CN00121550A CN1338433A CN 1338433 A CN1338433 A CN 1338433A CN 00121550 CN00121550 CN 00121550 CN 00121550 A CN00121550 A CN 00121550A CN 1338433 A CN1338433 A CN 1338433A
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- acid
- sewage
- biocide
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- circulating water
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Abstract
A method for using the treated sewage in the circulating water system includes adding disinfectant to sterilize the treated sewage, adding alkaline substance to regulate its pH value to 9.4-14, and introducing the treated water to the circulating water system. Its advantages include less pollution, simple operation and low cost.
Description
The present invention relates to reusing sewage with qualified discharge in the method for circulating water system, exactly, is to be used to suppress the burn into fouling that the qualified discharge reusing sewage produces after circulating water system and the method for microbial reproduction.
As everyone knows, the whole world faces serious problems such as water resources crisis and water pollution.Therefore, qualified discharge sewage recycling problem obtains the great attention of world's most countries.Reusing sewage in circulating water system, be can be the water consumption of industrial enterprise's saving 35%～45% on the one hand, can reduce the up to standard quantity of wastewater effluent of industrial enterprise more than 80% on the other hand.The U.S. just realizes urban sewage recycling with qualified discharge in the power generation cycle water system in the sixties in 20th century, and the nineties realizes the industrial sewage of qualified discharge is back to the petrochemical equipment circulating water system.The method of being taked is that qualified discharge sewage is further handled, to reduce COD (chemical oxygen demand), suspended substance and the microorganism concn in the sewage, use the corrosion and the fouling of the water conditioner operating device of high dosage again, adopt the microorganism in the method Control Circulation water of continuous chlorination or ozone.The qualified discharge sewage that this method was handled, erosion rate adhere to speed less than 15mg/cm less than 0.125mm/a
2.mon., the microorganism in the recirculated water can be controlled in 10
4Individual/as below the mL, can to satisfy the requirement of industrial production to recirculated water, realized the purpose of qualified discharge reusing sewage in circulating water system.
But there is the deficiency of two aspects in this treatment process, 1, to the water quality requirement height of the qualified discharge sewage of reuse, need carry out advanced treatment, and increased facility investment.2, need using dosage to reach the high density corrosion inhibiting and descaling agent of 300mg/L, bring eutrophication pollution, the control difficulty of microorganism is increased, also increased the water treatment expense simultaneously to recirculated water.In addition, hard and basicity sum is less than the water quality of 50mg/L for calcium, and it is unsatisfactory to have corrosion inhibiting and descaling agent operating device corrosive effect now, and when hardness in the water and basicity sum during greater than 250mg/L, the difficulty of ACU fouling is also bigger.
CN1166459 proposes to dispose of sewage with biological enzyme and the combination of conventional water conditioner, makes it can be back to circulating water system, reaches the burn into fouling of inhibition circulating water system and the purpose of microbial reproduction.But the treatment effect of this method is very poor in the practical application, can't resolve problems such as microbial reproduction, equipment corrosion and fouling, does not satisfy industrial requirement.
The objective of the invention is to overcome the above-mentioned defective of prior art, a kind of simple, effective, the economic method of qualified discharge reusing sewage in circulating water system that make is provided, solve the qualified discharge reusing sewage after circulating water system, interchanger burn into fouling aggravation, microbial reproduction and biological clay such as grow at problem.
Qualified discharge reusing sewage provided by the invention is in the method for circulating water system, comprise: (1) adds biocide and carries out disinfection in the sewage of qualified discharge, (2) add alkaline matter and make the pH value of sewage reach 9.5～14, (3) introduce circulating water system with the sewage of above-mentioned processing.
The said alkaline matter of the present invention can be oxide compound, oxyhydroxide, carbonate or supercarbonate or its mixture of lithium, sodium and potassium, for example, can be NaOH, KOH, Na
2CO
3, K
2CO
3, NaHCO
3, KHCO
3, Na
2O, K
2O, Li
2O, LiOH, Li
2CO
3And LiHCO
3One of or two or more mixture wherein.Preferred NaOH and KOH.The concentration that adds of alkaline matter is 50～2000mg/L, preferred 150～800mg/L.In above-mentioned concentration range, the pH value of recirculated water is controlled at 9.5～14, and preferred 10.0～12.0.
The said biocide of the present invention can be the oxidisability biocide, also can be non-oxidizable biocide, and wherein the oxidisability biocide is selected from halogen, hypohalite or its mixture, and non-oxidative bactericide is selected from quaternary ammonium salt and quaternary phosphonium salt or its mixture.Specifically, the oxidisability biocide can be chlorine, clorox, potassium hypochlorite, Losantin, DICHLOROISOCYANURIC ACID, trichloroisocyanuric acid, dioxide peroxide, bromine water, sodium hypobromite, potassium hypobromite, hypobromous acid calcium etc., non-oxidative bactericide can be the dimethyl benzyl tetradecyl ammonium chloride, tributyl tetradecyl phosphorus chloride, isothiazolinone, and other water-soluble or insoluble polymer type quaternary ammonium salt, quaternary alkylphosphonium salt biocide.The preferred clorox of said biocide, DICHLOROISOCYANURIC ACID and trichloroisocyanuric acid.The concentration that adds of biocide is 2～300mg/L, preferred 5～50mg/L.In addition, the oxidisability biocide is different with the pH value scope that non-oxidative bactericide is suitable for, and in general, the oxidisability biocide suits to add under low pH value, and non-oxidizable biocide can add under higher pH value, and this point those of ordinary skills can be in common prudence.
Said qualified discharge sewage comprises industrial sewage, the qualified discharge sewage of municipal effluent and its treated with same.
Adopt the inventive method, the qualified discharge reusing sewage when the circulating water system, also can be added inhibiter and Scale inhibitors, in right amount with the corrosion and the scale problems of further control generation in service.Said inhibiter can be 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, hydroxyl phosphino-acetate, amido three methene phosphonic acids, ethylene diamine tetra methylene phosphonic acid, benzotriazole copper inhibitor etc.Said Scale inhibitors can be copolymer, vinylformic acid and the AMPS of copolymer, vinylformic acid and AMPS (2-acrylamido-2-methyl propane sulfonic acid) of polyacrylic acid or salt, polymaleic anhydride, vinylformic acid and acrylate and the terpolymer of maleic anhydride.The consumption of inhibiter and Scale inhibitors can be 0～300mg/L, preferred 0～100mg/L.
Employing the inventive method in circulating water system, only need add mineral acid with reusing sewage when recirculated water discharges, regulate pH value to 6.5～8.5 and can discharge, and is free from environmental pollution.
Characteristics of the present invention are that under high pH value reusing sewage with qualified discharge is in circulating water system.As everyone knows, the pH value of recirculated water all has material impact to corrodibility, fouling tendency and the microbial reproduction of recirculated water.Prior art thinks that under low pH value, the corrodibility of water is strong, a little less than the fouling tendency, microorganism is easy to breeding, and under high pH value, then opposite, a little less than the corrodibility of water, fouling tendency is strong, and microorganism is difficult for breeding, and it is generally acknowledged that the pH value is higher than at 9.5 o'clock, fouling tendency is difficult to control, therefore, does not retrieve the method that is higher than processing and operating circulating water under 9.5 the condition in pH value as yet.
The present invention adopts under 9.5～14 high pH value reusing sewage with qualified discharge in circulating water system, has overcome the prejudice of prior art, has reached goal of the invention.This be because, under the low pH value that prior art adopts, lime carbonate, magnesiumcarbonate formation speed are slower, are deposited on the wall hard scale that formation is difficult to remove gradually.And under the high pH value that the present invention adopts, circulating water flow absorbs a large amount of carbonic acid gas from air when water cooling tower, generate the soft dirt that lime carbonate, magnesiumcarbonate etc. suspend in water rapidly with calcium hydroxide in the water, magnesium hydroxide etc., along with mobile being easy to of recirculated water caught and be removed by the filter screen in the pipeline, the fouling tendency of water is reduced significantly.
Therefore, the present invention has following outstanding advantage:
1. destroyed the environment of microbial growth and breeding, can make that microorganism concn is controlled at standard desired 10 in the recirculated water
5Individual/below the mL.
2. greatly reduce the corrodibility of recirculated water, corrosion of carbon steel speed can be controlled at below the 0.09mm/a.
3. greatly reduce the fouling degree on calcium in the water, magnesium ion concentration and the water cooler heat-transfer surface, adhere to speed and can be controlled at 20mg/cm
2.mon. in.
In addition, the inventive method has reduced organic addition, has reduced eutrophication pollution, and is simple to operate, and processing costs is low.Adopt the inventive method can reduce the fresh water consumption of enterprise significantly, reduce sewage discharge.
The invention will be further described below by embodiment, but therefore do not limit the present invention.
Embodiment 1
Present embodiment is the rotary hanging plate corrosion test, carries out with reference to HG/T2159-91.
Test water quality: the hard 12mg/L of calcium, the hard 5mg/L of magnesium, total alkalinity 25mg/L, COD65mg/L.
Add the NaOH of different concns in above-mentioned water quality, test-results sees Table 1.
The Corrosion results that table 1 obtains with the test of soft water quality
Embodiment 2
Present embodiment is the rotary hanging plate corrosion test, carries out with reference to HG/T2159-91.
Test water quality: the hard 87mg/L of calcium, the hard 36mg/L of magnesium, total alkalinity 110mg/L, COD65mg/L.
Add the NaOH of different concns in above-mentioned water quality, test-results sees Table 2.
The Corrosion results that the hardness quality test of water obtained during table 2 was used
Embodiment 3
Present embodiment is the rotary hanging plate corrosion test, carries out with reference to HG/T2159-91.
Test water quality: the hard 225mg/L of calcium, the hard 105mg/L of magnesium, total alkalinity 286mg/L, COD65mg/L.
Add the NaOH of different concns in above-mentioned water quality, test-results sees Table 3.
The Corrosion results that table 3 obtains with the high-hardness water test
Embodiment 4
Present embodiment is tested firmly for calcium in the reduction water.
Test water quality: the hard 87mg/L of calcium, the hard 36mg/L of magnesium, total alkalinity 110mg/L, COD65mg/L.
Get 5 250mL Erlenmeyer flasks, add the NaOH of above-mentioned water quality of 200mL and different concns respectively, shake up, at room temperature leave standstill 4 hours after, use filter paper filtering, get filtrate with reference to calcium ion concn in the GB/T14636-93 methods analyst water.Test-results sees Table 4.
Table 4 reduces the hard test-results of calcium
Embodiment 5 present embodiments are microbial inhibition assays.Test water quality: certain refinery qualified discharge sewage, main water-quality guideline is as shown in table 5.
The main water-quality guideline of certain refinery qualified discharge sewage of table 5
| Project | Data |
| Calcium hard (mg/L) | ????46.0 |
| Total alkali (mg/L) | ????136.0 |
| Total iron (mg/L) | ????1.51 |
| ????pH | ????7.36 |
| ????COD(mg/L) | ????104 |
| Heterotrophic bacterium (individual/mL) | ????3.7×10 5 |
| Fungi (individual/mL) | ????9.1×10 5 |
| Iron bacteria (individual/mL) | ????2.1×10 4 |
| Sulphate reducing bacteria (individual/mL) | ????2.0×10 4 |
In sterile 3 beakers, add above-mentioned qualified discharge sewage 2000mL respectively, in being 2 and 3 beaker, label adds 600mgNaOH, shake up, at label is to add 100mg dimethyl benzyl tetradecyl ammonium chloride (trade mark is " 1227 ") sterilant in 3 the beaker, shake up, act on after 4 hours and carry out Bacteria Detection, the results are shown in Table 6 according to 207,208,210 and 209 methods in " water coolant analysis and test method " (China PetroChemical Corporation's establishment).
Table 6 bactericidal assay result
Embodiment 6
This example is a dynamic analog test.
Test water quality: in embodiment 5 described on-the-spot qualified discharge sewage, add clorox and make its concentration reach 15mg/L, add NaOH again and make its concentration reach 300mg/L, stir, at room temperature left standstill 24 hours, and extracted the make up water that supernatant liquid is done dynamic analog test.
Test is carried out with reference to HG/T2160-91 standard " water coolant dynamic simulation experiment method ".Adopt the 20# carbon steel test tube of 2 φ 10 * 1 * 530mm to carry out parallel test, test water is walked tube side.The heating of test tube external application saturated vapor, 30 ± 1 ℃ of control test water inflow temperatures, 10 ℃ of exit port water temperature difference, the recirculated water cycles of concentration is controlled at 3.5～4.5 times, and test was carried out 400 hours continuously.The erosion rate that records test tube is 0.042mm/a, and adhering to speed is 12.6mg/ (cm
2.mon.), in the process of the test, the microorganism concn in the recirculated water is less than 10
3Individual/mL.
Claims (10)
1. with the method for qualified discharge reusing sewage in circulating water system, comprise: (1) adds biocide and carries out disinfection in the sewage of qualified discharge, (2) add alkaline matter and make the pH value of sewage reach 9.5～14, (3) introduce circulating water system with the sewage of above-mentioned processing.
2. in accordance with the method for claim 1, it is characterized in that said alkaline matter is selected from oxide compound, oxyhydroxide, carbonate and supercarbonate or its mixture of lithium, sodium and potassium.
3. in accordance with the method for claim 1, it is characterized in that the concentration that adds of said alkaline matter is 50～2000mg/L.
4. according to claim 1 or 3 described methods, it is characterized in that the concentration that adds of said alkaline matter is l50～800mg/L.
5. in accordance with the method for claim 1, it is characterized in that said biocide is selected from halogen, hypohalite, quaternary ammonium salt and quaternary alkylphosphonium salt, or its mixture.
6. according to claim 1 or 5 described methods, it is characterized in that, said biocide is selected from one of chlorine, clorox, potassium hypochlorite, Losantin, DICHLOROISOCYANURIC ACID, trichloroisocyanuric acid, dioxide peroxide, bromine water, sodium hypobromite, potassium hypobromite, hypobromous acid calcium, quaternary ammonium salt and quaternary alkylphosphonium salt, or two or more mixture wherein.
7. in accordance with the method for claim 6, it is characterized in that said biocide is selected from clorox, DICHLOROISOCYANURIC ACID and trichloroisocyanuric acid.
8. in accordance with the method for claim 1, it is characterized in that the concentration that adds of said biocide is 2～300mg/L.
9. according to claim 1 or 8 described methods, it is characterized in that the concentration that adds of said biocide is 5～50mg/L.
10. in accordance with the method for claim 1, it is characterized in that, after the sewage introducing circulating water system of handling, also can add inhibiter and the Scale inhibitors of 0～300mg/L, said inhibiter is selected from 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, hydroxyl phosphino-acetate, amido three methene phosphonic acids, ethylene diamine tetra methylene phosphonic acid and benzotriazole copper inhibitor, said Scale inhibitors is selected from polyacrylic acid or salt, polymaleic anhydride, the copolymer of vinylformic acid and acrylate, the copolymer of vinylformic acid and 2-acrylamido-2-methyl-propanesulfonic acid, the terpolymer of vinylformic acid and 2-acrylamido-2-methyl-propanesulfonic acid and maleic anhydride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00121550 CN1124989C (en) | 2000-08-11 | 2000-08-11 | Method for using treated sewage in circulating water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00121550 CN1124989C (en) | 2000-08-11 | 2000-08-11 | Method for using treated sewage in circulating water system |
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|---|---|
| CN1338433A true CN1338433A (en) | 2002-03-06 |
| CN1124989C CN1124989C (en) | 2003-10-22 |
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ID=4588870
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|---|---|---|---|
| CN 00121550 Expired - Lifetime CN1124989C (en) | 2000-08-11 | 2000-08-11 | Method for using treated sewage in circulating water system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973644A (en) * | 2010-10-29 | 2011-02-16 | 南京大学 | Reverse osmosis compound scale inhibitor |
| CN102603034A (en) * | 2011-12-15 | 2012-07-25 | 汪洋 | Method and device for regulating quality of desalinated sea water |
| CN103030238A (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 |
| CN103030224A (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 |
| CN103030239A (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 |
| 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 |
| CN103030240A (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 |
| CN103435124A (en) * | 2013-08-23 | 2013-12-11 | 首钢总公司 | Method for preventing catkin fouling |
-
2000
- 2000-08-11 CN CN 00121550 patent/CN1124989C/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973644A (en) * | 2010-10-29 | 2011-02-16 | 南京大学 | Reverse osmosis compound scale inhibitor |
| CN103030238A (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 |
| CN103030224A (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 |
| CN103030239A (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 |
| 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 |
| CN103030240A (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 |
| CN103030227B (en) * | 2011-09-29 | 2014-12-17 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN103030239B (en) * | 2011-09-29 | 2015-04-15 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN103030238B (en) * | 2011-09-29 | 2015-08-05 | 中国石油化工股份有限公司 | A kind of deionized water does the circulating water treatment method of moisturizing |
| CN103030224B (en) * | 2011-09-29 | 2015-09-09 | 中国石油化工股份有限公司 | A kind of deionized water does the circulating water treatment method of moisturizing |
| CN102603034A (en) * | 2011-12-15 | 2012-07-25 | 汪洋 | Method and device for regulating quality of desalinated sea water |
| CN103435124A (en) * | 2013-08-23 | 2013-12-11 | 首钢总公司 | Method for preventing catkin fouling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1124989C (en) | 2003-10-22 |
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Granted publication date: 20031022 |