CN108928981B - Environment-friendly treatment process for industrial wastewater - Google Patents
Environment-friendly treatment process for industrial wastewater Download PDFInfo
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- CN108928981B CN108928981B CN201810760125.2A CN201810760125A CN108928981B CN 108928981 B CN108928981 B CN 108928981B CN 201810760125 A CN201810760125 A CN 201810760125A CN 108928981 B CN108928981 B CN 108928981B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
Abstract
The invention discloses an environment-friendly treatment process of industrial wastewater, which comprises the following treatment processes of primary insoluble impurity removal, secondary flotation impurity removal and flocculation sedimentation: the environment-friendly treatment process of the industrial wastewater is an improvement of the traditional industrial wastewater treatment process, the collected wastewater is screened out of coarse particles and insoluble impurities by a physical impurity removal mode after the pH value is adjusted, secondary flotation impurity removal is beneficial to rapid sedimentation of fine suspended particles in the industrial wastewater, the purification effect of the industrial wastewater is improved, and in the flocculation precipitation process, metal ions and organic pollutants in the wastewater are precipitated and removed by using a slightly alkaline environment, and meanwhile, microorganisms in the wastewater can be killed and settled, so that the process is simple and easy to implement, and the efficiency is good.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to an environment-friendly treatment process for industrial wastewater.
Background
With the rapid development of industry, the variety and quantity of industrial wastewater are rapidly increased, the pollution to water is becoming wide and serious, and the health and safety of human beings are seriously threatened. Industrial wastewater generated in the industries of chemical industry, pharmacy, papermaking, food, fermentation and the like is increased sharply and is discharged into natural ecological water, so that the water is easy to smell and the water quality is easy to deteriorate, the growth of aquatic organisms and plants is influenced, the salinization of surrounding soil is caused, and the pollution of the water and the soil is gradually serious.
Chinese patent CN104045200A discloses an industrial wastewater comprehensive treatment system, which comprises a front-end filtering device, a front-end grease collector, a central water treatment device, a rear-end COD improving device and a rear-end water purifying device which are connected in sequence; the invention also provides an industrial wastewater comprehensive treatment process of the treatment system. The invention can extract the water in the industrial wastewater and leave pollutants, so that the treated industrial wastewater can reach the water quality standard of drinking water, and the invention adopts a pure physical separation technology to purify the industrial wastewater without groups, metal ions and microorganisms contained in boiling water can not be removed, so that secondary pollution is easy to cause, and the process and equipment are complex to operate.
Chinese patent CN105481161A discloses a method for cleaning and purifying industrial wastewater, comprising the following steps: (1) industrial wastewater and sewage flow through a hydrocyclone device to remove coarse insoluble precipitates in the industrial wastewater; (2) allowing the industrial wastewater to flow through a saturator and introducing air for oxygen saturation; (3) discharging fine suspended matters by using a flotation machine; (4) transferring the clean water to a water collector, and removing residual sediments in the water collector; (5) finally, releasing clean water through a filter; in the step (3), the clean water passing through the flotation machine is cleaned by using an electromagnetic activation device, and viruses, bacteria and soluble heavy metal salts are discharged; moreover, in the process that the cleaning water flows through the electromagnetic activation device, the hydrate shell in the cleaning water is broken, and the cleaning water continues to pass through the non-equilibrium plasma generator, so that suspended matters are condensed. In the method, viruses, bacteria and soluble heavy metal salts in the industrial wastewater cannot be effectively removed, the purification process is complex, the cost investment is too high, and the method is not suitable for wide popularization.
Chinese patent CN107721026A discloses an industrial wastewater treatment method, which comprises the following steps: (1) pre-filtering and pre-precipitating; (2) sterilization and pH value adjustment; (3) removing impurities and carrying out secondary filtration; (4) and (4) fine filtering. In the method, the treatment efficiency of the industrial wastewater is low, the treatment effect is general, and the wastewater treatment method is complex in operation and high in cost and cannot meet the industrialization requirement.
In the traditional industrial wastewater treatment process: the cleaning degree of virus, bacteria and soluble heavy metal salt in industrial sewage and wastewater is insufficient. Part of viruses and bacteria are not killed by the existing filter, and the incomplete precipitation of the soluble heavy metal salt easily influences the purity degree of water.
Therefore, aiming at the problems, the invention provides the environment-friendly treatment process for the industrial wastewater, which can overcome the problems of incomplete purification, high purification cost and poor effect of the industrial wastewater and has the characteristics of simple process and thorough purification.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provide an environment-friendly treatment process for industrial wastewater, solve the problems of complex treatment process, incomplete purification and high input cost of the industrial wastewater, and solve the problems of environmental pollution and influence on human health caused by industrial wastewater discharge.
In order to solve the technical problems, the invention adopts the following technical scheme:
an environment-friendly treatment process of industrial wastewater comprises the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 6.56-7.20, naturally settling for 3-4 h, and filtering to remove coarse grains and insoluble impurities in the industrial wastewater; the proper pH value can settle insoluble impurities in the industrial wastewater to a greater extent, and meanwhile, the harm of the pH value of the industrial wastewater to equipment and operators is avoided;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 75-85 ℃, keeping the temperature for 30-60 min, continuously introducing air for 25-45 min, settling for 3-4 h again, and removing suspended impurities by flotation; the heating flotation is beneficial to dissolving out, gathering and settling of fine suspended matters, and can kill microorganisms such as partial bacteria in the industrial wastewater, thereby improving the purification efficiency of the industrial wastewater;
s30, flocculation and sedimentation: and S20, adding a composite flocculant into the industrial wastewater without suspended impurities according to a proportion, continuously introducing oxygen, stirring at a constant speed for 2-3 hours, adjusting the pH to 7.22-7.45, standing and settling for 4-5 hours, filtering to remove precipitates, and ultrafiltering supernatant to obtain the treated industrial wastewater which can be reused or discharged. Oxygen is introduced to promote flocculation and sedimentation of soluble metal ions through oxidation, and then the pH is adjusted to further promote the sedimentation, so that the purification efficiency can be greatly improved.
Furthermore, in S10, the aperture of the filter screen is 300-500 meshes.
Further, in S20, the heating rate is 2-4 ℃/min.
Further, in S20, the air flow rate was 0.3m3/h~0.5m3/h。
Furthermore, in S30, the adding ratio of the industrial wastewater without suspended impurities in S20 to the composite flocculant is 1000 mL: 1g to 5 g.
Further, in S30, the composite flocculant is composed of the following raw materials in parts by weight: 3-9 parts of ferric oxide, 2-6 parts of calcium oxide, 5-8 parts of kaolin, 0.01-0.04 part of cuprous oxide, 10-15 parts of duckweed and 8-12 parts of reed extract. The duckweed and reed extracts are added into the composite flocculant, so that the composite flocculant is safe and environment-friendly, the flocculation effect and the action strength of the composite flocculant can be improved, the stability of the composite flocculant is enhanced, and the purification efficiency is further improved.
Furthermore, the composite flocculant is prepared from the following raw materials in parts by weight: 4-8 parts of ferric oxide, 3-5 parts of calcium oxide, 6-7 parts of kaolin, 0.02-0.03 part of cuprous oxide, 11-14 parts of duckweed and 9-10 parts of reed extract.
Furthermore, in S30, the duckweed is duckweed powder with a moisture content of 2.5% -4.5%.
Further, in S30, the reed extract is an ethanol extract of a stem of reed from which roots and leaves are removed.
Furthermore, in S30, the uniform stirring speed is 120r/min to 200 r/min.
The invention has the advantages and beneficial effects that:
1. the invention discloses an environment-friendly treatment process of industrial wastewater, which reforms the traditional industrial wastewater treatment process, wherein the collected wastewater is screened out of coarse particles and insoluble impurities by a physical impurity removal mode after the pH value is adjusted, secondary flotation impurity removal is favorable for fast sedimentation of fine suspended particles in the industrial wastewater, the purification effect of the industrial wastewater is improved, and in the flocculation sedimentation process, metal ions and organic pollutants in the wastewater are precipitated and removed by using an alkaline environment, and meanwhile, microorganisms in the wastewater can be killed and sedimentated, so that the process is simple and easy to implement and has high efficiency;
2. according to the environment-friendly treatment process of the industrial wastewater disclosed by the invention, before the impurities are removed by an insoluble process, the pH of the industrial wastewater is adjusted, so that the impurity removal rate and the process efficiency are improved, the environment is protected by controlling the pH value, the environment pollution is avoided as much as possible, the corrosion of the industrial wastewater to equipment and the injury of workers are reduced, and the operation can be relieved;
3. according to the environment-friendly treatment process for the industrial wastewater, the composite flocculant is utilized, kaolin, duckweed and reed extracts in the flocculant can adsorb heavy metal ions and powder pollutants in the industrial wastewater, the water quality can be improved, the clarity and the usability of the water quality are improved, the flocculation and sedimentation effects of the composite flocculant are strong, the impurity removal effect is good, the composite flocculant is safe and environment-friendly to select, and the environment cannot be polluted;
4. the method combines the modern advanced process, is simple and feasible, has low investment cost and high practicability, and is suitable for wide popularization.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
Environment-friendly treatment process for industrial wastewater
The preparation method comprises the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 6.56, naturally settling for 3 hours, and filtering by using a screen with the aperture of 300 meshes to remove coarse grains and insoluble impurities in the industrial wastewater;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 75 ℃ at the speed of 2 ℃/min, keeping the temperature for 30min, continuously introducing air for 25min, settling for 3h again, and removing suspended impurities by flotation;
in the above operation, the air flow rate was 0.3m3H; the adding proportion of the industrial wastewater without suspended impurities in the S20 to the composite flocculant is 1000 mL: 1g of the total weight of the composition.
S30, flocculation and sedimentation: and (8) adding the composite flocculant into the industrial wastewater with suspended impurities removed in S20 according to a proportion, continuously introducing oxygen, uniformly stirring at a speed of 120r/min for 2 hours, adjusting the pH to 7.22, standing and settling for 4 hours, filtering to remove precipitates, and performing ultrafiltration on supernatant to obtain the treated industrial wastewater which can be reused or discharged.
In the operation, the composite flocculant is prepared from the following raw materials in parts by weight: 3g of ferric oxide, 2g of calcium oxide, 5g of kaolin, 0.01g of cuprous oxide, 10g of duckweed and 8g of reed extract; the duckweed is duckweed powder with the water content of 2.5%; the reed extract is an ethanol extract of reed stem without roots and leaves.
The composite flocculant is used for the continuous operation of the environment-friendly treatment process of the industrial wastewater.
Example 2
Environment-friendly treatment process for industrial wastewater
The preparation method comprises the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 7.20, naturally settling for 4h, and filtering by using a screen with the aperture of 500 meshes to remove coarse grains and insoluble impurities in the industrial wastewater;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 85 ℃ at the speed of 4 ℃/min, keeping the temperature for 60min, continuously introducing air for 45min, settling for 4h again, and removing suspended impurities by flotation;
in the above operation, the air flow rate was 0.5m3H; the adding proportion of the industrial wastewater without suspended impurities in the S20 to the composite flocculant is 1000 mL: 5g of the total weight.
S30, flocculation and sedimentation: and (8) adding the composite flocculant into the industrial wastewater with suspended impurities removed in S20 according to a proportion, continuously introducing oxygen, uniformly stirring at a speed of 200r/min for 3 hours, adjusting the pH to 7.45, standing and settling for 5 hours, filtering to remove precipitates, and performing ultrafiltration on supernatant to obtain the treated industrial wastewater which can be reused or discharged.
In the operation, the composite flocculant is prepared from the following raw materials in parts by weight: 9g of ferric oxide, 6g of calcium oxide, 8g of kaolin, 0.04g of cuprous oxide, 15g of duckweed and 12g of reed extract; the duckweed is duckweed powder with the water content of 4.5%; the reed extract is an ethanol extract of reed stem without roots and leaves.
The composite flocculant is used for the continuous operation of the environment-friendly treatment process of the industrial wastewater.
Example 3
Environment-friendly treatment process for industrial wastewater
The preparation method comprises the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 6.86, naturally settling for 3 hours, and filtering by using a screen with the aperture of 300 meshes to remove coarse grains and insoluble impurities in the industrial wastewater;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 78 ℃ at the speed of 2 ℃/min, keeping the temperature for 40min, continuously introducing air for 30min, settling for 3h again, and removing suspended impurities by flotation;
in the above operation, the air flow rate was 0.3m3H; the adding proportion of the industrial wastewater without suspended impurities in the S20 to the composite flocculant is 1000 mL: 2g of the total weight.
S30, flocculation and sedimentation: and (8) adding the composite flocculant into the industrial wastewater with suspended impurities removed in S20 according to a proportion, continuously introducing oxygen, uniformly stirring at a speed of 140r/min for 2 hours, adjusting the pH to 7.35, standing and settling for 4 hours, filtering to remove precipitates, and performing ultrafiltration on supernatant to obtain the treated industrial wastewater which can be reused or discharged.
In the operation, the composite flocculant is prepared from the following raw materials in parts by weight: 4g of ferric oxide, 3g of calcium oxide, 6g of kaolin, 0.02g of cuprous oxide, 11g of duckweed and 9g of reed extract; the duckweed is duckweed powder with the water content of 3.0%; the reed extract is an ethanol extract of reed stem without roots and leaves.
The composite flocculant is used for the continuous operation of the environment-friendly treatment process of the industrial wastewater.
Example 4
Environment-friendly treatment process for industrial wastewater
The preparation method comprises the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 7.10, naturally settling for 4 hours, and filtering by using a screen with the aperture of 400 meshes to remove coarse grains and insoluble impurities in the industrial wastewater;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 82 ℃ at the speed of 3 ℃/min, keeping the temperature for 50min, continuously introducing air for 40min, settling for 4h again, and removing suspended impurities by flotation;
in the above operation, the air flow rate was 0.4m3H; the adding proportion of the industrial wastewater without suspended impurities in the S20 to the composite flocculant is 1000 mL: 4g of the total weight.
S30, flocculation and sedimentation: and (8) adding the composite flocculant into the industrial wastewater with suspended impurities removed in S20 according to a proportion, continuously introducing oxygen, uniformly stirring at a speed of 180r/min for 3 hours, adjusting the pH to 7.42, standing and settling for 5 hours, filtering to remove precipitates, and performing ultrafiltration on supernatant to obtain the treated industrial wastewater which can be reused or discharged.
In the operation, the composite flocculant is prepared from the following raw materials in parts by weight: 8g of ferric oxide, 5g of calcium oxide, 7g of kaolin, 0.03g of cuprous oxide, 14g of duckweed and 10g of reed extract; the duckweed is duckweed powder with the water content of 4.0%; the reed extract is an ethanol extract of reed stem without roots and leaves.
The composite flocculant is used for the continuous operation of the environment-friendly treatment process of the industrial wastewater.
Example 5
Environment-friendly treatment process for industrial wastewater
The preparation method comprises the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 7.02, naturally settling for 3.5h, and filtering by using a screen with the aperture of 400 meshes to remove coarse grains and insoluble impurities in the industrial wastewater;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 80 ℃ at the speed of 4 ℃/min, keeping the temperature for 45min, continuously introducing air for 40min, settling for 3.5h again, and removing suspended impurities by flotation;
in the above operation, the air flow rate was 0.4m3H; the adding proportion of the industrial wastewater without suspended impurities in the S20 to the composite flocculant is 1000 mL: 3g of the total weight.
S30, flocculation and sedimentation: and (3) adding the composite flocculant into the industrial wastewater with suspended impurities removed in S20 according to a proportion, continuously introducing oxygen, uniformly stirring at a speed of 150r/min for 2.5h, adjusting the pH to 7.35, standing and settling for 4.5h, filtering to remove precipitates, and ultrafiltering supernatant to obtain the treated industrial wastewater which can be reused or discharged.
In the operation, the composite flocculant is prepared from the following raw materials in parts by weight: 6g of ferric oxide, 4g of calcium oxide, 6g of kaolin, 0.02g of cuprous oxide, 13g of duckweed and 9g of reed extract; the duckweed is duckweed powder with the water content of 3.5%; the reed extract is an ethanol extract of reed stem without roots and leaves.
The composite flocculant is used for the continuous operation of the environment-friendly treatment process of the industrial wastewater.
Examples of the experiments
The industrial wastewater obtained by the environment-friendly treatment processes of the embodiments 1 to 5 is detected according to the wastewater discharge standard GB8778-1996, and the following test results are determined as shown in the following table 1:
table 1 test results of industrial wastewater obtained by the environmental protection treatment processes of examples 1 to 5
| Examples of the experiments | pH | COD | Suspended matter | Total phosphorus |
| Example 1 | 6.95 | 123mg/L | 43mg/L | 0.5mg/L |
| Example 2 | 6.98 | 115mg/L | 33mg/L | 0.8mg/L |
| Example 3 | 7.00 | 108mg/L | 36mg/L | 0.6mg/L |
| Example 4 | 6.98 | 110mg/L | 32mg/L | 0.7mg/L |
| Example 5 | 7.12 | 107mg/L | 45mg/L | 0.5mg/L |
As can be seen from table 1, the pH of the industrial wastewater obtained by the environment-friendly treatment process of embodiments 1 to 5 of the present invention meets the standard, the COD and suspended matter content is extremely low, and the total nitrogen content is also very low, which further proves that the environment-friendly treatment process of the industrial wastewater provided by the present invention has high purification efficiency for the industrial wastewater, good effect, and is simple and easy to implement, capable of shortening the process time, reducing the investment cost, environment-friendly, safe, and suitable for wide popularization.
The above description is only a preferred embodiment and an experimental example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An environment-friendly treatment process of industrial wastewater is characterized by comprising the following steps:
s10, preliminary insoluble impurity removal: collecting industrial wastewater, adjusting the pH value to 6.56-7.20, naturally settling for 3-4 h, and filtering to remove coarse grains and insoluble impurities in the industrial wastewater;
s20, secondary flotation impurity removal: heating the industrial wastewater filtered in the S10 to 75-85 ℃, keeping the temperature for 30-60 min, continuously introducing air for 25-45 min, settling for 3-4 h again, and removing suspended impurities by flotation;
s30, flocculation and sedimentation: s20, adding a composite flocculant into the industrial wastewater without suspended impurities according to a proportion, continuously introducing oxygen, stirring at a constant speed for 2-3 hours, adjusting the pH to 7.22-7.45, standing and settling for 4-5 hours, filtering to remove precipitates, and ultrafiltering supernatant to obtain treated industrial wastewater which can be reused or discharged;
the composite flocculant comprises the following raw materials in parts by weight: 3-9 parts of ferric oxide, 2-6 parts of calcium oxide, 5-8 parts of kaolin, 0.01-0.04 part of cuprous oxide, 10-15 parts of duckweed and 8-12 parts of reed extract;
in S30, the duckweed is duckweed powder with the water content of 2.5% -4.5%;
in S30, the reed extract is an ethanol extract of reed stems with roots and leaves removed.
2. The environment-friendly treatment process for industrial wastewater according to claim 1, wherein in S10, the aperture of the filtered screen is 300-500 meshes.
3. The environment-friendly treatment process for industrial wastewater according to claim 1, wherein in S20, the heating rate is 2 ℃/min to 4 ℃/min.
4. The process for environmentally friendly treating industrial wastewater according to claim 1, wherein in S20, the flow rate of air is 0.3m3/h~0.5m3/h。
5. The environment-friendly treatment process of industrial wastewater according to claim 1, wherein in S30, the addition ratio of the industrial wastewater without suspended impurities in S20 to the composite flocculant is 1000 mL: 1g to 5 g.
6. The environment-friendly treatment process of industrial wastewater according to claim 1, wherein the composite flocculant is prepared from the following raw materials in parts by weight: 4-8 parts of ferric oxide, 3-5 parts of calcium oxide, 6-7 parts of kaolin, 0.02-0.03 part of cuprous oxide, 11-14 parts of duckweed and 9-10 parts of reed extract.
7. The environment-friendly treatment process for industrial wastewater according to claim 1, wherein in S30, the uniform stirring speed is 120r/min to 200 r/min.
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| CN110498558B (en) * | 2019-07-17 | 2021-09-21 | 浙江工贸职业技术学院 | Electroplating pretreatment wastewater treatment process |
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