CN101503237A - Chemical reagent combination and use thereof in sharp separation and water quality purification - Google Patents

Chemical reagent combination and use thereof in sharp separation and water quality purification Download PDF

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Publication number
CN101503237A
CN101503237A CNA2009100260510A CN200910026051A CN101503237A CN 101503237 A CN101503237 A CN 101503237A CN A2009100260510 A CNA2009100260510 A CN A2009100260510A CN 200910026051 A CN200910026051 A CN 200910026051A CN 101503237 A CN101503237 A CN 101503237A
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China
Prior art keywords
water
sludge
mud
chemical agent
combination
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CNA2009100260510A
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Chinese (zh)
Inventor
安树青
赵永军
徐卫祥
朱薇薇
徐贵明
庄瑶
李航
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Nanjing University
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Nanjing University
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Priority to CNA2009100260510A priority Critical patent/CN101503237A/en
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Abstract

The invention belongs to the technical field of environmental engineering and in particular relates to screening, combinatorial arrangement, dosage determination of chemical agent, application range thereof and a use method. Vast sludge can be generated in the lake and river dredging engineering, and the best choice is in-situ treatment and the utilization of the sludge. The invention uses the chemical agent combination to treat the sludge so that mud and water can be quickly separated, thus forming soft soil and water and simultaneously purifying the water. The chemical agent combination is the combination of flocculating agent and strong oxidizer. The flocculating agent is polyacrylamide (PAM), and the strong oxidizer is industrial sodium ferrate (Na2FeO4). In terms of the volume of the sludge to be treated, when the polyacrylamide powder reagent is 10-100mg/L and the sodium ferrate is 1-5 g/L, an optimum effect in sludge-water separation and water purification is realized. The chemical agent combination has simple, convenient and safe use method. The used reagent is nontoxic, has wide applicable scope and low treatment cost; and after being used, the chemical agent does not generate secondary pollution problem and is particularly suitable for the in-situ treatment of the sludge generated in the substrate sludge dredging process of lakes, rivers, pools and the like.

Description

A kind of chemical agent combination and the application in muddy water sharp separation and purification of water quality thereof
One, technical field
The invention belongs to field of environment engineering technology, the consumption that is specifically related to screening, combination of agents configuration and the reagent of chemical reagent is determined, and range of application and using method.
Two, background technology
Along with the Chinese society rapid economy development, urban population sharply increases, and the blowdown flow rate to city river, lake day by day increases, and water pollutes and is on the rise, and quality of water environment goes from bad to worse.Processing to dredging, desilting and the bed mud thereof in river course, lake is very urgent, is directly connected to resident's living environment.The amount of sludge that produces in China lake, the river dredging engineering process has reached surprising degree at present.The development of mud-water separation technology and equipment is imminent, and its development will directly influence the modernization of lake, river dredging engineering and the development process in city.Especially big and medium-sized cities He Hu silts up and pollutes the international image that has had influence on China, and the solution of this problem will obtain tangible environmental benefit and social benefit.
Through patent and literature search, existing patent: centrifugal mud and water separator (application number: 01105318.6 a yellow quick man of virtue and ability), novel separator for mud and water (application number: 200720050567.5 Luo Wenping), efficient mud-water separation filtering integral waste disposal plant (application number: 02234404.7 practises outstanding peak), a kind of flocculation deposition apparatus (application number: 200610023699.9 kings such as China etc.); As bantam, these all are not suitable for using in engineering project or extensive sludge treatment; Sewer mud and water separating equipment (application number: 200420109142.3 Zhang Jun etc.), fail when carrying out mud-water separation water quality is purified; A kind of device for separating mud and water of mud in enormous quantities and method thereof (application number: 200410051124.9 rely big literary composition etc.) exist equipment complicated, the shortcoming that cost is high; Device for separating mud and water (application number: 90106605.2 Xu Qiu one-tenth etc.), be the device that the waste water waste recovery was utilized during ceramic industry was produced, can't in the sludge treatment of dredging engineering, use.Water treatment procedure in high suspended matter concentration, people are with organic polymer coargulator polyacrylamide (PAM) and the composite processing High Turbidity Water of Huanghe River of polymerize aluminum chloride, and (lotus, Nie who wears is for school building, Dai Yan etc. to have obtained preferably flocculating effect, " research of High Turbidity Water of Huanghe River coagulation and sedimentation experiment ", water supply and drainage, 2000,26 (6), 25~27).Also have Poly Dimethyl Diallyl Ammonium Chloride and the composite processing of polymerize aluminum chloride ultra, flocculating effect also is better than adding separately inorganic flocculating agent (Luo Xiaopeng, Tang Yongsheng, Zhao Liguo etc., " the composite processing High Turbidity Water of Huanghe River of cationic water purification agent HCA-1 and water purification agent PAC ", water purification technology, 2000,19 (4), 23~27).But these are all at improving flocculating effect.At present, also do not have a kind of chemical reagent compounded combination to reach simultaneously and make muddy water sharp separation and the dual purpose that purifies water.
At present the mud-water separation treatment technology of invention and equipment (comprising belt filter pressing dehydrator, integrated cement tripping device, centrifugal mud pump etc.) exist though floor space is little that efficient is low, trucking costs is high and shortcoming and defect such as the processing cost is big, and the pollution problem of mud does not obtain any solution yet.If adopt chemical process, use flocculation agent separately, also can only play the effect that improves the sludge solidification effect.So, this just press for a kind of on the spot, nearby, new technologies reaches the purpose of mud-water separation and purification of water quality simultaneously cheaply.As seen, invent a kind of low cost of muddy water sharp separation and purification of water quality, process for treating sludge of high benefit of integrating, will have a wide range of applications and promotion prospect.
Three, summary of the invention
The problem that the present invention need solve is:
Invent and a kind of lake, river, sediment of pond dredging are produced the method that mud is handled, this method can reach the double goal of muddy water sharp separation and purification of water quality simultaneously, and it is low, simple to operate to have a cost, efficient height, advantage such as effective.Simultaneously,, adjust the matched proportion density of reagent flexibly, guarantee the high efficiency and the persistence of treatment effect according to mud feature and the pollution situation of implementing the place.
Technical scheme of the present invention is:
The agent combination of using in muddy water sharp separation and purification of water quality of the present invention is the combination of flocculation agent polypropylene amine and strong oxidizer industry Na2Fe04.
1, the field is reasonably handled in planning
In order to reduce transportation cost, and be beneficial to the mud that utilizes after handling nearby, plan rational sludge treatment field.To guarantee that on the one hand the processing field is reasonable with the job location haulage track, also will conveniently handle the output of curing sludge and utilization more in addition, so totally the reduction transportation cost; On the other hand, determine suitable area, improve the utilization ratio of handling the field at concrete construction work.
2, the interpolation of reagent
(1) usage quantity of polyacrylamide (PAM)
PAM is a kind of linear macromolecule polymkeric substance, and chemical formula is CONH 2[CH 2-CH] n, it is soluble in water, is dissolved in common organic solvents such as benzene, ether, ester class, acetone hardly, and the thick liquid of several near-transparents of its aqueous solution belongs to non-dangerous goods, nontoxic, non-corrosiveness.Should be mixed with concentration before using earlier and be 1 ‰ the aqueous solution, promptly the powder of adding 1000mg in the 1L water can add less water earlier during preparation, adds the water yield of desired concn after polymer dissolution again.The water of dissolving polyacrylamide gets final product for the normal temperature tap water, suitably improve temperature energy accelerate dissolution, but water temperature surpasses 50 ℃, and polymkeric substance can produce thermal destruction when water temperature was too high, influenced result of use.
Total input amount of PAM will be considered processing cost and handle two factors of benefit.The PAM benefit is taken all factors into consideration three indexs of treatment effect: water removal rate, PO 4 3--P clearance, COD clearance; Get formula: PAM utilization benefit=(water removal rate+PO 4 3--P clearance+COD clearance)/and cost, as the use foundation of each engineering, set the input amount of PAM.According to test-results in the table 1, along with the input amount increase of PAM, to handle benefit and improve constantly, the PAM use cost is about 1.35 yuan/cubic inch, and promptly the PAM usage quantity is 50mg/L, when effect reaches maximum value, benefit the best.After surpassing this value, can cause benefit to descend on the contrary.At this moment, the moisture content of laboratory sample, PO 4 3--P, COD are respectively 70.1%, 3.8mg/l and 158.7mg/l, and the PAM price is 27 yuan/kilogram.
Table 1 treatment effect and PAM working concentration relation
(2) usage quantity of Na2Fe04
Ferrate is a kind of compound of sexavalence iron, chemical formula Na 2FeO 4Having extremely strong oxidisability, is a kind of water conditioner of non-chlorine type high-efficiency multi-function, has good sterilization, the effect of killing the virus.Because it integrates oxidation, flocculation, sterilization, sterilization multiple efficacies, has high-efficiency continuous effect, through overtesting, result such as form are according to formula: Na 2FeO 4Utilization benefit=(NH 4 +-N clearance+PO 4 3--P clearance+COD clearance)/cost.Laboratory sample initial value: NH 4 +-N, PO 4 3--P, COD are respectively 62.8%, 3.8mg/ and 158.7mg/l.Na 2FeO 4Cost is 18 yuan/kilogram.At Na 2FeO 4When usage quantity is no more than 5g/L, Na 2FeO 4Utilization benefit is directly proportional with use cost; Greater than 5g/L then benefit can reduce.
If NH in the sewage 4 +The concentration of-N and PO 4 3-The concentration of-P respectively when being 40mg/l and 5mg/l, Na 2FeO 4Addition be 1g/L, along with pollution level increases, can improve Na gradually 2FeO 4Input amount.If Na 2FeO 4Concentration then can influence the clearance of COD during greater than 5g/L, is unfavorable for the effect of construction processing.
Table 2 treatment effect and Na 2FeO 4The working concentration relation
(3) the input mode of reagent
Adopt piston-type mud transferpump, pipe diameter is 1m.2 of designs can be regulated the opening of size, each big or small 100cm on transport pipe 2
The input of reagent is finished by the three storehouse formula administration systems that the Tianjin Daze Science and Technology Development Co., Ltd produces; This administration system mainly is made up of the spiral pump and the under meter of blending bin, stirring medicine pond, band converter plant.
The polyacrylamide of prepackage mixes with pressure water afterwards and delivers to stirring medicine pond by water sprayer in the blending bin, fully stirs into concentration and be 1 ‰ solution.Spiral pump is according to preset value, and the PAM input amount of determining after promptly taking all factors into consideration the PAM cost and handling benefit is aspirated the mud conveying pipe opening that PAM solution is delivered to connection from the medicine pond.
For the input of Na2Fe04, toward the stack up yard course of conveying, add Na from the river course at mud 2FeO 4, with large-scale funnel dress Na2Fe04, the lower end feeds opening, adapts to mud transfer rate in the pipeline by the leakage speed of regulating funnel, and promptly per second is carried cubic number, reaches to add aimed concn Na 2FeO 4Purpose, and in the pipeline transportation system, mix with mud.
3, the pilling up time of mud
Mud through after the chemical reagent processing directly is stacked at the hydraulic reclamation field through transfer lime, stacks thickness 1m, the comparison of different standing and reacting times of 1-24h has been carried out in test, reach a conclusion: treatment effect reaches balance during about 2h, and the prolongation of time can't significantly improve treatment effect, sees accompanying drawing 1.
4. the recycling of water and mud utilize again
There are the irrigation canals and ditches that compile the water source hydraulic reclamation field, and leads to the lake, river.Mud is filled out and is put in when blowing the stockyard, and the water through purifying directly compiles and is disposed to nearby in the lake, river through irrigation canals and ditches.At this moment, water removal rate reaches more than 40%; The NH of water body 4 +-N, PO 4 3--P and COD, clearance are respectively more than 40%, 60% and 50%.Mud after the processing obtains solidifying and purifying, and recovers to have avoided pollution with soil as river, lakeside bank zone vegetation.
The present invention compared with prior art its beneficial effect is:
Mud of the present invention is meant the mud of river course, lake, pond and other great water bodies bottom; Be the stream shape; Water ratio is 65~85%; Water and water quality after handling through this chemical agent combination not only can dischargings on the spot up to standard, also can carry out cycling and reutilization, and the mud after handling can be used as the soil of economic worth material is more arranged.The present invention by in the project implementing process such as city river, bottom mud in lake dredging the processing of generation mud technical support is provided.This method for sludge treatment has simply, fast, the characteristics of low-cost, high benefit, can be on the spot, nearby large batch of mud is handled, can promote the muddy water sharp separation significantly, and remove the NH in the water body efficiently 4 +-N, PO 4 3--P and COD, clearance are respectively more than 40%, 60% and 50%.Its advantage is mainly reflected in: (1) can make solidified mud change harmful to treasure by the discharging consolidation to dredging silt on the one hand, and the protection environment satisfies the requirement of Sustainable development.The water of reclaiming clean can enter on the spot and carry out cycling and reutilization in river course or the lake on the other hand; (2) methods such as traditional relatively other mud-water separation and solidified technology and equipment, the present invention can save the secondary water treatment of mud, saves construction costs.
Four, description of drawings
Fig. 1 sludge treatment effect and stacking treatment time relation
I-moisture measurement unit: %
II-NH 4 +-N unit of measure: mg/L
III-PO 4 3--P unit of measure: mg/L
IV-COD unit of measure: mg/L
Five, embodiment
Embodiment 1
In the bed mud dredging process in upper reach river course, river, Jinchuan, Nanjing, at first the water content and the water quality of mud are analyzed, recording water content of slurry is 70.1%, NH 4 +The concentration of-N, PO 4 3-The concentration of-P and COD are respectively 62.8mg/l, 3.8mg/l and 158.7mg/l.Then pending mud is added PAM and Na 2FeO 4, make that the concentration of PAM powder is 10mg/l in the mud, Na 2FeO 4Concentration be 1g/l.Mud through after the chemical reagent processing leaves standstill 2h, reclaims the Ni Heshui after separating then, analyzes after testing, and water removal rate is 53.9%, NH 4 +The clearance of-N is 32.4%, PO 4 3-The clearance of-P is 42.8%, and the clearance of COD is 45.2%.
Embodiment 2
In the excess sludge treating processes between the dehydration of Nan Jingxin village sludge of sewage treatment plant, detection can get before handling: water content of slurry is 78.2%, supernatant liquor NH 4 +The concentration of-N is 106.4mg/l, PO 4 3-The concentration of-P is 8.3mg/l, and COD content is 146.8mg/l.In pending mud, add PAM and Na 2FeO 4, make that the concentration of PAM is 80mg/l in the mud, Na 2FeO 4Concentration be 2g/l.Handle after check and analysis, the sludge water clearance reaches 45.6%, NH 4 +The clearance of-N is 45.2%, PO 4 3-The clearance of-P is 61.2%, and the clearance of COD is 55.2%.
Embodiment 3
In the bed mud of Pukou, Nanjing cultivating pool is cleaned up the pond process, the water content and the water quality of pond sludge to be analyzed, the water content that records bed mud is 82.3%, NH 4 +-N, PO 4 3-The concentration of-P and COD is respectively 35.7mg/l, 5.8mg/l and 126.3mg/l.In pending mud, add PAM and Na 2FeO 4, make that the concentration of PAM powder is 50mg/l in the mud, Na 2FeO 4Concentration be 2g/l.Handle the back and reclaim mud sample and water sample.Analyze after testing, the sludge water clearance reaches 38.5%, NH 4 +The clearance of-N is 31.4%, PO 4 3-The clearance of-P is 58.6%, and the clearance of COD is 43.8%.

Claims (4)

1. a chemical agent combination of using in muddy water sharp separation and purification of water quality is characterized in that its chemical agent combination is the combination of flocculation agent and strong oxidizer.
2. chemical agent combination according to claim 1 is characterized in that flocculation agent is a polyacrylamide, and strong oxidizer is industrial Na2Fe04.
3. according to the application method of the described chemical agent combination of claim 1 in muddy water sharp separation and purification of water quality, it is characterized in that pending mud in employing piston-type mud transferpump pipeline transportation, add polyacrylamide powder reagent 10~100mg/L, Na2Fe04 1~5g/L by administration system and funnel system respectively through pipeline tapping; Be put in the hydraulic reclamation field through filling out after carrying the whipping process mixing to handle; After leaving standstill 2h, water removal rate reaches more than 40%, forms curing sludge; Divide dried up NH 4 +-N, PO 4 3--P and COD clearance reach respectively more than 40%, 60% and 50%.
4. the application of chemical agent combination according to claim 1 in lake, river course, pond, great water body bottom mud muddy water sharp separation and purification of water quality.
CNA2009100260510A 2009-03-18 2009-03-18 Chemical reagent combination and use thereof in sharp separation and water quality purification Pending CN101503237A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102531313A (en) * 2012-01-16 2012-07-04 宁波工程学院 Method for treating sludge and promoting reduction of sludge by using ferrate
CN102583937A (en) * 2012-01-16 2012-07-18 宁波工程学院 Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity
CN102583949A (en) * 2012-01-16 2012-07-18 宁波工程学院 Application of ferrate in municipal sludge conditioning
CN102701567A (en) * 2012-06-05 2012-10-03 江苏杰成凯新材料科技有限公司 Rapid dewatering treatment method for high-water-content dredged silt
CN107382028A (en) * 2017-09-08 2017-11-24 芜湖格丰环保科技研究院有限公司 A kind of bed mud cohesion abatement agent and its preparation method and application

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102531313A (en) * 2012-01-16 2012-07-04 宁波工程学院 Method for treating sludge and promoting reduction of sludge by using ferrate
CN102583937A (en) * 2012-01-16 2012-07-18 宁波工程学院 Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity
CN102583949A (en) * 2012-01-16 2012-07-18 宁波工程学院 Application of ferrate in municipal sludge conditioning
CN102701567A (en) * 2012-06-05 2012-10-03 江苏杰成凯新材料科技有限公司 Rapid dewatering treatment method for high-water-content dredged silt
CN107382028A (en) * 2017-09-08 2017-11-24 芜湖格丰环保科技研究院有限公司 A kind of bed mud cohesion abatement agent and its preparation method and application
CN107382028B (en) * 2017-09-08 2020-06-02 芜湖格丰环保科技研究院有限公司 Sediment condensation reducing agent and preparation method and application thereof

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Application publication date: 20090812