CN106317332A - Modified natural polymeric flocculant for coking waste water and preparation method thereof - Google Patents
Modified natural polymeric flocculant for coking waste water and preparation method thereof Download PDFInfo
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- CN106317332A CN106317332A CN201510389413.8A CN201510389413A CN106317332A CN 106317332 A CN106317332 A CN 106317332A CN 201510389413 A CN201510389413 A CN 201510389413A CN 106317332 A CN106317332 A CN 106317332A
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Abstract
The invention discloses a modified natural polymeric flocculant for treating coking waste water and a preparation method thereof. The modified natural polymeric flocculant is a cationic starch-polyacrylamide grafted copolymer. The preparation method comprises stirring to uniformly disperse 10-80% by mass of a cationic starch aqueous solution, heating the cationic starch aqueous solution to a temperature of 70-95 DEG C, carrying out gelatinization for 0.2-0.7h, cooling the paste to a temperature of 30-50 DEG C, adding 5-70% by mass of an acrylamide monomer and 0.001-0.01% by mass of an initiator potassium persulphate into the cationic starch aqueous solution, carrying out a reaction process at a temperature of 50-90 DEG C for 0.2-1h, cooling the reaction product to the room temperature, carrying out ethanol deposition, washing the head product, filtering the head product through a Buchner funnel, repeatedly washing the head product 2-5 times, and carrying out vacuum drying on the precipitates at a temperature of 50-80 DEG C to obtain the cationic starch-polyacrylamide grafted copolymer.
Description
Technical field
The present invention relates to a kind of for Treatment of Wastewater in Coking the preparation method of modified natural polymer flocculant, and the application that this flocculant is in coking chemical waste water, belong to environmental protection flocculant technical field.
Background technology
Coking chemical waste water is that coal prepares the organic wastewater produced in coke and relevant coke chemicals production process, detection indicate that: the one-tenth of coking chemical waste water is grouped into complexity, containing heterocyclic compounds such as substantial amounts of difficult for biological degradation aromatic series Organic substance, polycyclic compound and oxygen sulfur nitrogen, biodegradability extreme difference, these materials mainly include volatile phenol, biphenyl, pyridine and quinoline etc..These pollutant COD in biochemical process processed waste water remains above discharging standards, and colourity and abnormal smells from the patient heavier, if outer row can be to environment structure severe contamination, therefore, the process of coking chemical waste water is the emphasis of research the most both at home and abroad.
Flocculant is generally applicable to domestic and international Treatment of Coking Effluent process at present, and it can effectively remove COD, colourity and float etc. in coked waste water.Traditional flocculant is inorganic flocculating agent, mainly having aluminum sulfate, iron sulfate, aluminium silicate, ferrosilite, iron chloride, ferrous sulfate etc., it is generally applicable in coked waste water, but inorganic flocculating agent to there is applicable pH range narrow, produce floc sedimentation and alumen ustum is little, the shortcomings such as ton cost of water treatment is high.Organic polymer coargulator is fast because of its flocculation rate, and floc sedimentation settleability is good, applied widely receives much concern, especially natural macromolecule flocculating agent, and it is present in nature in a large number, and source is wide, low cost, and hydrolyzate is nontoxic, is the focus of current flocculant research.
Summary of the invention
When the invention aims to solve existing flocculant Treatment of Wastewater in Coking, there is floc sedimentation and alumen ustum is little, the problems such as pH narrow range and ton cost of water treatment are high, and then a kind of modified natural polymer flocculant being specifically designed to coking chemical waste water and preparation method thereof is provided.
nullFor achieving the above object，Modified natural polymer flocculant for coking chemical waste water of the present invention and preparation method thereof is as follows: prepare cationic starch-polyacrylamide graft copolymer flocculant，By uniform for cationic starch aqueous solution dispersed with stirring that mass fraction is 10 ~ 80%，And it is heated to 70 ~ 95 DEG C，Gelatinizing 0.2 ~ 0.7h，Then 30 ~ 50 DEG C are cooled to，Add the acrylamide monomer accounting for cationic starch aqueous solution mass fraction 5 ~ 70%，The initiator potassium persulfate of mass fraction 0.001 ~ 0.01%，Under 50 ~ 90 DEG C of temperature conditionss，After reaction 0.2 ~ 1h，It is cooled to room temperature，Precipitate with ethanol and wash head product，Then filtered on buchner funnel is used，Cyclic washing 2 ~ 5 times，After precipitate is vacuum dried at a temperature of 50 ~ 80 DEG C，Obtain cationic starch-polyacrylamide graft copolymer.
When cationic starch-the polyacrylamide graft copolymer of preparation is in Treatment of Wastewater in Coking, when Treatment of Wastewater in Coking, 1000ml coking chemical waste water adds 5 ~ 90mg cationic starch-polyacrylamide copolymer flocculant.After process, the COD clearance in coking chemical waste water is 80 ~ 90%, and percent of decolourization is 90 ~ 98%, and removal efficiency is 85 ~ 95%.
Compared with existing inorganic flocculating agent, benefit and the effect of the present invention be: the starch used in the present invention is widely present in nature, low cost, the problems such as the catabolite after its biodegradation is nontoxic, non-secondary pollution.Bonding bridging action can be produced between the chain molecule of cationic starch-polyacrylamide copolymer, simultaneously containing a number of polar group in strand, by the solids suspended in absorption water, make to build bridge between particle or make particle coacervation form big flocculate by charging neutrality, therefore the sedimentation of particle in suspension can be accelerated, the flocculation aggregation more close and firm that the flocculation aggregation that it is formed is formed compared with inorganic flocculating agent, have and obviously accelerate solution clarification, promote the effects such as sedimentation.Particularly those are more demonstrated its superiority with the colloid solution microgranule of negative charge.
Cationic starch prepared by the present invention-polyacrylamide copolymer good stability, consumption is little, and flocculating effect is good, can use acid, be widely portable in the commercial production such as coking chemical waste water, smelting wastewater, dyeing waste water under the conditions of alkalescence.
Detailed description of the invention
Example example 1: weigh the cationic starch aqueous solution that a certain amount of mass fraction is 30%, it is heated to 75 DEG C, gelatinizing 0.3h, cool to 35 DEG C, it is subsequently adding the acrylamide monomer accounted at cationic starch aqueous solution mass fraction 20%, the initiator potassium persulfate of mass fraction 0.003%, under 60 DEG C of temperature conditionss, after reaction 0.4h, it is cooled to room temperature, precipitates with ethanol and wash head product, then with filtered on buchner funnel, cyclic washing 3 times, after being vacuum dried by precipitate, obtains cationic starch-polyacrylamide graft copolymer at a temperature of 55 DEG C.Process the coking chemical waste water of 1000ml with the 70m cationic starch of above-mentioned preparation-polyacrylamide copolymer, this modified natural polymer flocculant is 83.5% to COD clearance in coking chemical waste water, and percent of decolourization is 93.2%, and removal efficiency is 88.4%.
Example example 2: weigh the cationic starch aqueous solution that a certain amount of mass fraction is 45%, it is heated to 83 DEG C, gelatinizing 0.4h, cool to 40 DEG C, it is subsequently adding the acrylamide monomer accounted at cationic starch aqueous solution mass fraction 40%, the initiator potassium persulfate of mass fraction 0.006%, under 70 DEG C of temperature conditionss, after reaction 0.6h, it is cooled to room temperature, precipitates with ethanol and wash head product, then with filtered on buchner funnel, cyclic washing 3 times, after being vacuum dried by precipitate, obtains cationic starch-polyacrylamide graft copolymer at a temperature of 65 DEG C.Process the coking chemical waste water of 1000ml with the 50m cationic starch of above-mentioned preparation-polyacrylamide copolymer, this modified natural polymer flocculant is 85.6% to COD clearance in coking chemical waste water, and percent of decolourization is 95.1%, and removal efficiency is 89.6%.
Example example 3: weigh the cationic starch aqueous solution that a certain amount of mass fraction is 60%, it is heated to 90 DEG C, gelatinizing 0.6h, cool to 45 DEG C, it is subsequently adding the acrylamide monomer accounted at cationic starch aqueous solution mass fraction 55%, the initiator potassium persulfate of mass fraction 0.008%, under 80 DEG C of temperature conditionss, after reaction 0.8h, it is cooled to room temperature, precipitates with ethanol and wash head product, then with filtered on buchner funnel, cyclic washing 4 times, after being vacuum dried by precipitate, obtains cationic starch-polyacrylamide graft copolymer at a temperature of 75 DEG C.Process the coking chemical waste water of 1000ml with the 30m cationic starch of above-mentioned preparation-polyacrylamide copolymer, this modified natural polymer flocculant is 88.2% to COD clearance in coking chemical waste water, and percent of decolourization is 96.2%, and removal efficiency is 92.5%.
Example example 4: weigh the cationic starch aqueous solution that a certain amount of mass fraction is 10%, it is heated to 70 DEG C, gelatinizing 0.2h, cool to 30 DEG C, it is subsequently adding the acrylamide monomer accounted at cationic starch aqueous solution mass fraction 70%, the initiator potassium persulfate of mass fraction 0.001%, under 50 DEG C of temperature conditionss, after reaction 0.2h, it is cooled to room temperature, precipitates with ethanol and wash head product, then with filtered on buchner funnel, cyclic washing 3 times, after being vacuum dried by precipitate, obtains cationic starch-polyacrylamide graft copolymer at a temperature of 50 DEG C.Process the coking chemical waste water of 1000ml with the 5m cationic starch of above-mentioned preparation-polyacrylamide copolymer, this modified natural polymer flocculant is 80% to COD clearance in coking chemical waste water, and percent of decolourization is 90%, and removal efficiency is 85%.
Example example 5: weigh the cationic starch aqueous solution that a certain amount of mass fraction is 70%, it is heated to 95 DEG C, gelatinizing 0.7h, cool to 50 DEG C, it is subsequently adding the acrylamide monomer accounted at cationic starch aqueous solution mass fraction 5%, the initiator potassium persulfate of mass fraction 0.01%, under 90 DEG C of temperature conditionss, after reaction 1h, it is cooled to room temperature, precipitates with ethanol and wash head product, then with filtered on buchner funnel, cyclic washing 5 times, after being vacuum dried by precipitate, obtains cationic starch-polyacrylamide graft copolymer at a temperature of 80 DEG C.Process the coking chemical waste water of 1000ml with the 90m cationic starch of above-mentioned preparation-polyacrylamide copolymer, this modified natural polymer flocculant is 90% to COD clearance in coking chemical waste water, and percent of decolourization is 98%, and removal efficiency is 95%.
Claims (2)
- null1. the preparation method for the modified natural polymer flocculant of coking chemical waste water，It is characterized in that: prepare cationic starch-polyacrylamide graft copolymer flocculant，By uniform for cationic starch aqueous solution dispersed with stirring that mass fraction is 10 ~ 80%，And it is heated to 70 ~ 95 DEG C，Gelatinizing 0.2 ~ 0.7h，Then 30 ~ 50 DEG C are cooled to，Add the acrylamide monomer accounting for cationic starch aqueous solution mass fraction 5 ~ 70%，The initiator potassium persulfate of mass fraction 0.001 ~ 0.01%，Under 50 ~ 90 DEG C of temperature conditionss，After reaction 0.2 ~ 1h，It is cooled to room temperature，Precipitate with ethanol and wash head product，Then filtered on buchner funnel is used，Cyclic washing 2 ~ 5 times，After precipitate is vacuum dried at a temperature of 50 ~ 80 DEG C，Obtain cationic starch-polyacrylamide graft copolymer.
- The application of a kind of modified natural polymer flocculant for coking chemical waste water the most according to claim 1, it is characterised in that: when Treatment of Wastewater in Coking, 1000ml coking chemical waste water adds 5 ~ 90mg cationic starch-polyacrylamide copolymer flocculant.
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| CN201510389413.8A CN106317332A (en) | 2015-07-06 | 2015-07-06 | Modified natural polymeric flocculant for coking waste water and preparation method thereof |
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| CN201510389413.8A CN106317332A (en) | 2015-07-06 | 2015-07-06 | Modified natural polymeric flocculant for coking waste water and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115092998A (en) * | 2022-07-04 | 2022-09-23 | 庆阳新庄煤业有限公司新庄煤矿 | Salt-reducing ash-reducing coal dust-removing flocculating agent for return air main roadway water collecting tank |
| CN117285138A (en) * | 2023-10-24 | 2023-12-26 | 太仓市业洪净水新材料有限公司 | Aluminum sulfate water treatment agent and preparation method thereof |
-
2015
- 2015-07-06 CN CN201510389413.8A patent/CN106317332A/en not_active Withdrawn
Non-Patent Citations (2)
| Title |
|---|
| 刘汉兵等: "淀粉接枝型絮凝剂的合成及在废水中的应用", 《工业安全与环保》 * |
| 唐宏科等: "阳离子淀粉-丙烯酰胺接枝共聚物絮凝剂的制备及其絮凝性能", 《化工环保》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115092998A (en) * | 2022-07-04 | 2022-09-23 | 庆阳新庄煤业有限公司新庄煤矿 | Salt-reducing ash-reducing coal dust-removing flocculating agent for return air main roadway water collecting tank |
| CN117285138A (en) * | 2023-10-24 | 2023-12-26 | 太仓市业洪净水新材料有限公司 | Aluminum sulfate water treatment agent and preparation method thereof |
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Effective date of registration: 20180612 Address after: 300384 international business center, 2 Alex Hua Tian Road, Huayuan Industrial Park, Nankai District, Tianjin 6020 Applicant after: Tianjin Zhongfu environmental Polytron Technologies Inc Address before: 300384 International Business Centre 2 Alex Hua Tian Road, Nankai District, Tianjin 6020 Applicant before: Di Jiandong |
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Application publication date: 20170111 |