CN110745922A - Method for preparing efficient flocculant by using waste acid and application - Google Patents
Method for preparing efficient flocculant by using waste acid and application Download PDFInfo
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- CN110745922A CN110745922A CN201911060193.9A CN201911060193A CN110745922A CN 110745922 A CN110745922 A CN 110745922A CN 201911060193 A CN201911060193 A CN 201911060193A CN 110745922 A CN110745922 A CN 110745922A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a method for preparing a high-efficiency flocculant by using waste acid and application thereof, wherein the method comprises the following steps: adding a weight removing agent into the waste acid, reacting at room temperature, and filtering to obtain the weight-removed waste acid; and adding iron powder into the weight-removed waste acid, and evaporating and crystallizing after reaction to obtain the high-efficiency flocculant. And the obtained high-efficiency flocculant is applied to the treatment of textile printing and dyeing wastewater. According to the method for preparing the high-efficiency flocculant by using the waste acid and the application, the heavy metal is removed by adopting a two-step process to obtain the high-efficiency flocculant, the preparation method is simple, the process cost is low, the waste acid can be effectively treated, and meanwhile, the flocculant can be formed for treating the textile printing and dyeing wastewater.
Description
Technical Field
The invention relates to a method for preparing a high-efficiency flocculant by using waste acid and application thereof, belonging to the technical field of flocculant preparation and application.
Background
The main problems existing in the steel and metal product industry in China at present are that the water consumption per ton of products is large, the treatment cost of the generated waste acid is high, the solid waste is harmless and the like, and the sustainable development of the industry is restricted. The waste acid mainly contains a large amount of ferric salt and trace heavy metals, and due to the existence of the trace heavy metals, the heavy metals are difficult to biodegrade and easy to be absorbed and enriched by organisms, the toxicity has persistence, and the waste acid is a pollutant with potential hazard, and if the heavy metals cannot be effectively removed, serious threats are certainly caused to the ecological environment and the human health, so that the waste acid cannot be comprehensively utilized. Therefore, how to effectively treat the heavy metal pollution of the water body, protect the human health and the ecological environment, and relieve the pressure of resources and environment in China is a problem which is not negligible at present.
According to statistics, about 400 hundred million tons of industrial wastewater is generated in China every year, wherein the heavy metal wastewater accounts for about 60 percent. The waste water seriously pollutes surface water and underground water, and the total amount of available water resources is sharply reduced. Heavy metals are difficult to biodegrade, easy to be absorbed and enriched by organisms, and persistent in toxicity, so that the heavy metals are pollutants with potential hazards, and can seriously threaten the ecological environment and human health if not timely treated. Therefore, how to effectively treat the heavy metal pollution of the water body and protect the human health and the ecological environment is a problem which is not negligible at present.
The industrial waste acid generated by steel mills and the like is directly treated as hazardous waste, and the method not only causes environmental pollution again, but also wastes a large amount of resources and has higher disposal cost. In addition, a large amount of NaOH is added for neutralization reaction, so that the pH value of waste acid is neutral, but in the process, the cost is increased due to the addition of the NaOH, a large amount of sludge is generated, a large amount of dangerous waste is caused, and the cost for dangerous waste disposal is about 5000 yuan/ton according to the relevant regulations of the dangerous waste disposal (HW 48). The amount of absolutely dry sludge generated per ton of waste acid is about 300-400 kg, and the waste acid can only be buried. The traditional processes have high cost and great influence on the environment, and better process treatment needs to be developed to optimize each process flow.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect of high treatment cost of waste acid in the prior art, and provides a method for preparing a high-efficiency flocculant by using the waste acid and application thereof.
In order to solve the technical problem, the invention provides a method for preparing a high-efficiency flocculant by using waste acid, which comprises the following steps:
(1) adding a weight removing agent into the waste acid, reacting at room temperature, and filtering to obtain the weight-removed waste acid;
(2) and adding iron powder into the weight-removed waste acid, and evaporating and crystallizing after reaction to obtain the high-efficiency flocculant.
By adopting the technical scheme, the heavy metal is removed by adopting a two-step process to obtain the high-efficiency flocculant, the preparation method is simple, the process cost is low, and the flocculant is formed while the waste acid is effectively treated.
Preferably, the weight removing agent is one of sodium sulfide, ferrous sulfide or ferric sulfide.
By adopting the technical scheme, the heavy metal can be effectively removed by adopting the weight removing agent, and other pollution can not be caused.
Preferably, the addition amount of the weight removing agent in the step (1) is 1-2 g/L, and the reaction time is 1-2 h.
By adopting the technical scheme, the weight removing efficiency can be improved by adopting the weight removing agent with the addition amount and the reaction time.
Preferably, the adding amount of the iron powder in the step (2) is 20-35 g/L, the reaction temperature is 55-65 ℃, and the reaction time is 1-2 h.
By adopting the technical scheme, the yield and the effect of the flocculant can be improved by adopting the added amount of the iron powder, the reaction temperature and the reaction time.
The invention also provides application of the high-efficiency flocculant prepared by the method for preparing the high-efficiency flocculant from waste acid in treatment of textile printing and dyeing wastewater.
Preferably, the application of the high-efficiency flocculant in the treatment of textile printing and dyeing wastewater comprises the following steps:
adding the high-efficiency flocculant into the waste water containing the textile printing and dyeing, and stirring for 2-10 min at 20-80 ℃.
By adopting the technical scheme, the high-efficiency flocculant carries out the wastewater treatment of textile printing and dyeing at a certain temperature and for a certain stirring time, so that the removal rate of COD and chromaticity in the wastewater is improved.
Preferably, the stirring speed is 100-200 r/min.
Through adopting above-mentioned technical scheme, adopt the stirring speed in the above-mentioned scope, can be so that the flocculating agent can not lead to the fact the agglomeration because the stirring speed is low excessively, also can not lead to the fact the colloid to break rapidly because the stirring speed is too high, cause the flocculating constituent too little flocculation effect poor.
The invention achieves the following beneficial effects:
(1) according to the method for preparing the high-efficiency flocculant by using the waste acid and the application, the heavy metal is removed by adopting a two-step process to obtain the high-efficiency flocculant, the preparation method is simple, the process cost is low, the waste acid can be effectively treated, and the flocculant can be formed for treating the textile printing and dyeing wastewater;
(2) the invention relates to a method for preparing a high-efficiency flocculating agent by using waste acid and application thereof, the prepared high-efficiency flocculating agent can be used for sewage treatment in textile and printing and dyeing industries, and the treatment effect is as follows: the removal rate of COD reaches 70-80%, and the removal rate of chroma reaches more than 95%;
(3) according to the method for preparing the high-efficiency flocculant by using the waste acid and the application, the development and the utilization of the high-efficiency flocculant achieve the purpose of treating waste by using waste, so that the environmental protection treatment cost of two major industries is reduced, the content of various heavy metals in the waste acid is reduced by adding the weight removing agent so as to enable the content of the heavy metals to reach the national standard discharge index, and meanwhile, iron powder with different proportions is added into the waste water after weight removal, so that the proportion of ferrous iron and iron is adjusted, and the content of free acid is reduced; the contents of heavy metal, ferrous chloride and the like reach the national chemical industry standard (HG/T4200-2011) of industrial ferrous chloride, and the high-efficiency treating agent is prepared at the same time.
Drawings
FIG. 1 is a graph showing the effect of the high-efficiency flocculant obtained in example 1 of the present invention before and after addition to textile printing and dyeing wastewater.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The chromaticity determination refers to GB11903-89, the COD determination refers to HJ828-2017, and the determination of heavy metals, ferric chloride and free acid refers to industrial ferrous chloride HG/T4200-.
Example 1
(1) Removing heavy metals: adding the weight removing agent sodium sulfide into the industrial wastewater pickling waste acid at the concentration of 1g/L, and uniformly mixing for 1 h;
the heavy metal content after weight removal is shown in table 1.
(2) Preparing a high-efficiency flocculant: adding iron powder into the wastewater after weight removal, wherein the concentration is 20g/L, the temperature is 55 ℃, uniformly mixing, the reaction time is 1h, the content of free acid in the waste acid is reduced from 2.62% to 0.4%, and the content of ferrous chloride is increased from 23.01% to 29.32%.
Adding the obtained high-efficiency flocculant into the wastewater containing the textile printing and dyeing according to the addition of 80mg/L, stirring at the stirring speed of 100r/min for 2min at the temperature of 20 ℃, and measuring that the COD removal rate is 73 percent and the chroma removal rate is 95 percent.
As shown in figure 1, the obtained effect graphs before and after the high-efficiency flocculant is added into the textile printing and dyeing wastewater show that the textile printing and dyeing wastewater is effectively treated by adding the high-efficiency flocculant.
Example 2
(1) Removing heavy metals: adding the weight removing agent sodium sulfide into the industrial wastewater pickling waste acid at the concentration of 1.5g/L, and uniformly mixing for 1 h;
the heavy metal content after weight removal is shown in table 1.
(2) Preparing a high-efficiency water treatment agent: adding iron powder into the wastewater after weight removal, wherein the concentration is 25g/L, the temperature is 60 ℃, uniformly mixing, the reaction time is 1h, the content of free acid in the waste acid is reduced from 2.62% to 0.33%, and the content of ferrous chloride is increased from 23.01% to 31.49%.
Adding the obtained high-efficiency flocculant into the wastewater containing the textile printing and dyeing according to the addition of 80mg/L, stirring at the stirring speed of 150r/min for 8min at 50 ℃, and measuring that the COD removal rate is 75% and the chroma removal rate is 96%.
Example 3
(1) Removing heavy metals: putting the weight-removing agent ferrous sulfide into the industrial wastewater pickling waste acid at the concentration of 1g/L, and uniformly mixing for 1 h;
(2) preparing a high-efficiency water treatment agent: adding iron powder into the wastewater after weight removal, wherein the concentration is 25g/L, the temperature is 55 ℃, uniformly mixing, the reaction time is 2h, the content of free acid in the waste acid is reduced from 2.62% to 0.35%, and the content of ferrous chloride is increased from 23.01% to 33.62%.
Adding the obtained high-efficiency flocculant into the wastewater containing the textile printing and dyeing according to the addition of 80mg/L, stirring for 8min at the temperature of 50 ℃, wherein the stirring speed is 150r/min, and the measured COD removal rate is 76% and the chromaticity removal rate is 96%.
Example 4
(1) Removing heavy metals: the weight-removing agent iron sulfide is added into the industrial wastewater pickling waste acid at the concentration of 1.5g/L, and the mixture is uniformly mixed for 1 h.
(2) Preparing a high-efficiency water treatment agent: adding iron powder into the wastewater after weight removal, wherein the concentration is 30g/L, the temperature is 65 ℃, uniformly mixing, the reaction time is 1h, the content of free acid in the waste acid is reduced to 0.31%, and the content of ferrous chloride is increased to 34.21%.
Adding the obtained high-efficiency flocculant into the wastewater containing the textile printing and dyeing according to the addition of 80mg/L, stirring for 10min at 80 ℃, wherein the stirring speed is 200r/min, and the measured COD removal rate is 77% and the chromaticity removal rate is 97%.
Example 5
(1) Removing heavy metals: adding the weight removing agent sodium sulfide into the industrial wastewater pickling waste acid at the concentration of 1.5g/L, and uniformly mixing for 1 h;
(2) preparing a high-efficiency water treatment agent: adding iron powder into the wastewater after weight removal, wherein the concentration is 30g/L, the temperature is 60 ℃, uniformly mixing, the reaction time is 2 hours, the content of free acid in the waste acid is reduced to 0.29%, and the content of ferrous chloride is increased to 35.87%.
Adding the obtained high-efficiency flocculant into the wastewater containing the textile printing and dyeing according to the addition of 80mg/L, stirring for 10min at 80 ℃, wherein the stirring speed is 200r/min, and the measured COD removal rate is 76% and the chromaticity removal rate is 97%.
TABLE 1
| Metal species | Without removing the weight content | Example 1 | Example 2 | National standard |
| Fe | 16.414％ | 13.046％ | 12.312％ | --- |
| Cd | 2.433×10-7 | 1.028×10-7 | 1.0×10-7 | ≤5×10-6 |
| Cr | 9.179×10-5 | 9.179×10-5 | 8.024×10-5 | ≤1×10-4 |
| Cu | 5.173×10-5 | 1.437×10-5 | 1.148×10-5 | ≤5×10-5 |
| Ni | 2.139×10-5 | 1.112×10-5 | 1.015×10-5 | ≤4×10-5 |
| Pb | 5.159×10-5 | 3.475×10-5 | 2.187×10-5 | ≤4×10-5 |
| Zn | 3.668×10-4 | 2.68×10-4 | 1.321×10-4 | ≤1.5×10-4 |
Table 1 shows the heavy metal content in the waste acid before and after the weight removing agent is added, and it can be seen from table 1 that the content of the heavy metal after the weight removing agent is added is reduced and reaches the national standard, and the content of the heavy metal is reduced with the increase of the adding amount of the weight removing agent.
Comparing examples 1 to 5, the heavy metal content of each example was decreased by adding the weight removing agent, the free acid was decreased with the increase of the iron powder addition amount and the reaction time, and the ferrous chloride content was increased with the increase of the iron powder addition amount and the reaction time, but the cost was increased when the addition amount was large.
The waste acid and solid waste in the metal product processing industry are used for treating sewage in the textile printing and dyeing industry, and the treatment effect is as follows: the COD removal rate reaches 70-80%, and the chroma removal rate is up to more than 95%. The development and utilization of the high-efficiency flocculant achieve the purpose of treating wastes with wastes, thereby reducing the environmental protection treatment cost of the two industries. Because the content of solid waste organic matters in the textile printing and dyeing industry is high, the solid waste organic matters can be treated by burning, and simultaneously the generated heat energy can be used for generating electricity, thereby solving the problem that the solid waste in the metal product industry can only be buried.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A method for preparing a high-efficiency flocculant by using waste acid is characterized by comprising the following steps:
(1) adding a weight removing agent into the waste acid, reacting at room temperature, and filtering to obtain the weight-removed waste acid;
(2) and adding iron powder into the weight-removed waste acid, and evaporating and crystallizing after reaction to obtain the high-efficiency flocculant.
2. The method for preparing the high-efficiency flocculating agent by using the waste acid as claimed in claim 1, wherein the weight removing agent is one of sodium sulfide, ferrous sulfide or ferric sulfide.
3. The method for preparing the efficient flocculant by using waste acid as claimed in claim 1, wherein the addition amount of the weight removing agent in the step (1) is 1-2 g/L, and the reaction time is 1-2 h.
4. The method for preparing the efficient flocculant by using waste acid as claimed in claim 1, wherein the adding amount of the iron powder in the step (2) is 20-35 g/L, the reaction temperature is 55-65 ℃, and the reaction time is 1-2 h.
5. The application of the high-efficiency flocculant prepared by the method for preparing the high-efficiency flocculant from the waste acid according to any one of claims 1 to 4 in treatment of textile printing and dyeing wastewater.
6. The application of the high-efficiency flocculant prepared from waste acid according to claim 5 is characterized by comprising the following steps of:
adding the high-efficiency flocculant into the waste water containing the textile printing and dyeing, and stirring for 2-10 min at 20-80 ℃.
7. The application of the high-efficiency flocculant prepared from waste acid as claimed in claim 6, wherein the stirring speed is 100-200 r/min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107226599A (en) * | 2017-08-03 | 2017-10-03 | 环境保护部南京环境科学研究所 | The preparation method and the recycling processing method of heavy metal sewage sludge of a kind of ferric-polysilicate flocculant using iron content heavy metal sewage sludge as raw material |
| CN108358409A (en) * | 2018-03-07 | 2018-08-03 | 江苏天楹环保能源成套设备有限公司 | A kind of steel wire rope sludge and spent acid method for innocent treatment |
| CN108383272A (en) * | 2018-03-07 | 2018-08-10 | 江苏天楹环保能源成套设备有限公司 | A kind of sludge recovery treatment method of waste acid that wire rope factory generates |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107226599A (en) * | 2017-08-03 | 2017-10-03 | 环境保护部南京环境科学研究所 | The preparation method and the recycling processing method of heavy metal sewage sludge of a kind of ferric-polysilicate flocculant using iron content heavy metal sewage sludge as raw material |
| CN108358409A (en) * | 2018-03-07 | 2018-08-03 | 江苏天楹环保能源成套设备有限公司 | A kind of steel wire rope sludge and spent acid method for innocent treatment |
| CN108383272A (en) * | 2018-03-07 | 2018-08-10 | 江苏天楹环保能源成套设备有限公司 | A kind of sludge recovery treatment method of waste acid that wire rope factory generates |
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Application publication date: 20200204 |