CN106746025B - Method for treating purified cotton wastewater - Google Patents
Method for treating purified cotton wastewater Download PDFInfo
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- CN106746025B CN106746025B CN201710059383.3A CN201710059383A CN106746025B CN 106746025 B CN106746025 B CN 106746025B CN 201710059383 A CN201710059383 A CN 201710059383A CN 106746025 B CN106746025 B CN 106746025B
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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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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Abstract
A method for treating purified cotton wastewater comprises the following process steps: (1) adding benzalkonium chloride and nitrocotton acid wastewater with the temperature not lower than 50 ℃ into refined cotton wastewater with the temperature not lower than 50 ℃ and uniformly mixing to form a mixed solution, wherein the adding amount of the nitrocotton acid wastewater is limited by that the pH value of the mixed solution reaches 1-4, and the adding amount of the benzalkonium chloride is limited by that the concentration of the benzalkonium chloride in the mixed solution reaches 40-160 mg/L; (2) and (2) standing the mixed solution formed in the step (1) at the temperature of not lower than 50 ℃ until pollutants in the mixed solution are separated out and completely precipitated, and then separating the supernatant from the precipitated pollutants, wherein the separated supernatant is the treated waste liquid.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and particularly relates to a method for treating strong-alkalinity high-COD-content purified cotton wastewater.
Background
The refined cotton wastewater (high-concentration wastewater) produced in the refined cotton production process is strong alkaline (pH value is 12.62-13.3), the COD content is high (35856.57-88209.06 mg/L), the chroma is high, more substances which are difficult to degrade are contained, the biodegradability is poor, and the main pollutants are as follows: dissolved cotton linters and cellulose are subjected to alkaline cooking to generate substances such as low molecular saccharides, fat, wax and the like, and products, water-soluble carbohydrates, alkali lignin and the like generated by saponification reaction are organic wastewater which is difficult to treat, and the environment is greatly harmed if the organic wastewater is discharged in an overproof manner. Therefore, the treatment of the purified cotton wastewater is of great importance, and is not only related to the survival development of the industry, but also related to the influence of ecological environments such as water quality and soil around enterprises on the health of human bodies.
The existing purified cotton wastewater (high-concentration wastewater) treatment usually adopts the following processes: acid precipitation air flotation, neutralization sedimentation, anaerobic treatment, aerobic treatment, secondary sedimentation and coagulation sedimentation tank are carried out on the refined cotton wastewater. The acid precipitation air floatation is that nitrocotton acid wastewater is added into refined cotton alkaline wastewater, so that the pH value of a mixed solution formed by the two types of wastewater is 2-3, lignin and cellulose dissolved in the wastewater are precipitated under an acid condition, and are separated by air floatation; and adjusting the pH of the water subjected to acid precipitation air floatation treatment to be neutral by adding caustic soda, then entering an anaerobic, aerobic and secondary sedimentation tank biochemical system for treatment, and finally discharging after coagulating sedimentation treatment. The method has higher operation cost per ton of water, and increases the salt content in the wastewater, reduces the biochemical treatment efficiency and influences the treatment effect because the acid precipitation is carried out firstly and then the alkali is added for neutralization.
In order to overcome the problems of the method, ZL201110171937.1 discloses a method for treating wastewater containing purified cotton, which comprises the steps of separating high-concentration wastewater and low-concentration wastewater of the purified cotton from a treatment source, adding the high-concentration wastewater of the purified cotton into a high-concentration alkaline water circulation tank to precipitate thick black liquor and impurities, lifting the precipitated thick black liquor and impurities to an acid precipitation sedimentation tank by a pump, adding nitrocotton acid water, adjusting the pH value to 2-3, precipitating lignin in the impurities under an acidic condition, standing and precipitating in a mud bucket in the acid precipitation sedimentation tank, and discharging supernatant in the mud bucket into the low-concentration wastewater of the purified cotton to neutralize the alkalinity of the low-concentration wastewater; and after the supernatant on the mud bucket is discharged, the sludge in the mud bucket enters a chamber type filter press for dehydration, and the dehydrated water solution enters the purified cotton low-concentration wastewater. Purified cotton low-concentration wastewater, discharged supernatant and a dehydrated water solution enter a grid alkaline water regulating tank to balance water quality and water quantity, then are pumped into a neutral air flotation tank, and then sequentially flow into an anaerobic tank, an aerobic tank, a first sedimentation tank and a coagulating sedimentation tank. Adding coagulant into the coagulating sedimentation tank according to the COD of the water, and adjusting the COD value of the coagulating sedimentation tank to ensure that the effluent reaches the discharge standard of weapon industry water pollutants for explosives and powders (GB 144703.1-2002). Although the method reduces the operation cost per ton of water and improves the treatment effect of the purified cotton wastewater, the acid precipitation effect is not ideal, and the removal rate of COD after acid precipitation is only 52.9% (see the paragraph 0021 and 0023 in the specification of ZL 201110171937.1), thereby increasing the treatment difficulty of the subsequent treatment process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for treating purified cotton wastewater so as to improve the removal rate of pollutants in the wastewater during acid precipitation and precipitation.
According to the method for treating the purified cotton wastewater, the treated purified cotton wastewater is strong-alkaline wastewater with high COD content, namely high-concentration purified cotton wastewater generated in the production process of purified cotton. In the invention, the COD is chemical oxygen demand CODCrIs written shortly. The innovation of the invention is that benzalkonium chloride, also called dodecyl dimethyl benzyl ammonium chloride, is added during acid precipitation and precipitation, and belongs to a non-oxidizing bactericide.
The invention relates to a method for treating purified cotton wastewater, which comprises the following process steps:
(1) adding benzalkonium chloride and nitrocotton acid wastewater with the temperature not lower than 50 ℃ into refined cotton wastewater with the temperature not lower than 50 ℃ and uniformly mixing to form a mixed solution, wherein the adding amount of the nitrocotton acid wastewater is limited by that the pH value of the mixed solution reaches 1-4, and the adding amount of the benzalkonium chloride is limited by that the concentration of the benzalkonium chloride in the mixed solution reaches 40-160 mg/L;
or adding benzalkonium chloride, nitrocotton acid wastewater at the temperature of not less than 50 ℃ and sulfuric acid into the refined cotton wastewater at the temperature of not less than 50 ℃ and uniformly mixing to form a mixed solution, wherein the adding amount of the nitrocotton acid wastewater and the sulfuric acid is limited by that the pH value of the mixed solution reaches 1-4, and the adding amount of the benzalkonium chloride is limited by that the concentration of the benzalkonium chloride in the mixed solution reaches 40-160 mg/L;
(2) and (2) standing the mixed solution formed in the step (1) at the temperature of not lower than 50 ℃ until pollutants in the mixed solution are separated out and completely precipitated, and then separating the supernatant from the precipitated pollutants, wherein the separated supernatant is the treated waste liquid.
It should be noted that: the purpose of adding the sulfuric acid is to reduce the adding amount of the nitrocotton acid wastewater, thereby reducing the wastewater amount of a treatment system.
According to the method for treating the purified cotton wastewater, the benzalkonium chloride is added in the following two sequences, so that the treatment effect is not affected:
1. adding benzalkonium chloride into refined cotton wastewater at a temperature of not less than 50 ℃, uniformly mixing, and then adding nitrocotton acidic wastewater at a temperature of not less than 50 ℃, or adding nitrocotton acidic wastewater at a temperature of not less than 50 ℃ and sulfuric acid.
2. Adding nitrocotton acid wastewater with the temperature not lower than 50 ℃ into refined cotton wastewater with the temperature not lower than 50 ℃, or adding nitrocotton acid wastewater with the temperature not lower than 50 ℃ and sulfuric acid to form a mixed solution with the pH value of 1-4, and then adding benzalkonium chloride.
The invention has the following beneficial effects:
1. as benzalkonium chloride is added during the acidification precipitation, the removal rate of pollutants in the refined cotton wastewater during the acidification precipitation is greatly improved. Tests show that the removal rate of pollutants in the refined cotton wastewater can reach about 80% (see the examples), so that the treatment difficulty of subsequent treatment procedures is reduced or the subsequent treatment procedures can be reduced.
2. In the production, the discharge temperature of the purified cotton wastewater is 80-100 ℃, so the temperature of the method is adaptive to the discharge temperature of the purified cotton wastewater, the purified cotton wastewater is not required to be heated during acid precipitation and precipitation, the purified cotton wastewater can be directly treated, the operation links are reduced, and the energy is saved.
3. Benzalkonium chloride is a commercial product, the current market price is about 10,000 yuan/ton RMB, and the concentration of benzalkonium chloride in the mixed solution is only 40-160 mg/L, so that the total operation cost of the purified cotton wastewater treatment is not increased.
Detailed Description
The method for treating purified cotton wastewater according to the present invention will be further described with reference to examples.
The following examples were conducted in a laboratory, and refined cotton wastewater and nitrocellulose acid wastewater were obtained from nitrocellulose production company, Sichuan, China, and benzalkonium chloride was purchased from Kyowa-Heshui-Ben chemical company, as a product.
Example 1
In the embodiment, the pH value of the purified cotton wastewater to be treated is 12.92, and the COD is 88209.06 mg/L; the pH value of the nitrocotton acid wastewater is 0.59, and the COD is 564.35 mg/L.
The process steps of this example are as follows:
(1) taking 2500mL of refined cotton wastewater and 500mL of nitrocotton acid wastewater, respectively keeping the temperature to 85 ℃, adding 2500mL of refined cotton wastewater at 85 ℃ into a beaker, then adding 0.12g of benzalkonium chloride, uniformly mixing, then sequentially adding 500mL of nitrocotton acid wastewater at 85 ℃ and 33.33mL of concentrated sulfuric acid, and uniformly mixing, wherein the pH value of the formed mixed solution is 1.70, and the concentration of benzalkonium chloride in the mixed solution is 40 mg/L;
(2) and (2) placing the mixed solution formed in the step (1) into a water bath kettle with a constant temperature of 85 ℃ for standing for 30min to separate out and completely precipitate pollutants in the mixed solution, then performing suction filtration by using fine filter cloth, separating a supernatant from the precipitated pollutants, wherein the volume of the separated supernatant is 2710mL, and through detection, the pH value of the supernatant is 1.67, the COD content is 15611.14mg/L, and the removal rate of the pollutants in the embodiment is 80.84% through calculation.
Example 2
In the embodiment, the pH value of the purified cotton wastewater to be treated is 13.30, and the COD is 56085.60 mg/L; the pH value of the nitrocotton acid wastewater is 1.11, and the COD is 43.08 mg/L.
The process steps of this example are as follows:
(1) taking 1000mL of refined cotton wastewater and 1000mL of nitrocotton acid wastewater, respectively keeping the temperature to 55 ℃, adding 1000mL of refined cotton wastewater at the temperature of 55 ℃ into a beaker, then adding 1000mL of nitrocotton acid wastewater at the temperature of 55 ℃, uniformly mixing, adding 0.16g of benzalkonium chloride, and uniformly mixing, wherein the pH value of the formed mixed solution is 3.32, and the concentration of the benzalkonium chloride in the mixed solution is 80 mg/L;
(2) and (2) placing the mixed solution formed in the step (1) into a 55-DEG C constant-temperature water bath kettle, standing for 60min to separate out and completely precipitate pollutants in the mixed solution, then performing suction filtration by using fine filter cloth, separating a supernatant from the precipitated pollutants, wherein the volume of the separated supernatant is 1790mL, and through detection, the pH value of the supernatant is 3.30, the COD content is 6461.91mg/L, and the removal rate of the pollutants in the embodiment is 79.40% through calculation.
Example 3
In the embodiment, the pH value of the purified cotton wastewater to be treated is 12.62, and the COD is 35866.57 mg/L; the pH value of the nitrocotton acid wastewater is-0.05, and the COD is 219.68 mg/L.
The process steps of this example are as follows:
(1) taking 1000mL of refined cotton wastewater and 1000mL of nitrocotton acid wastewater, respectively keeping the temperature to 50 ℃, adding 1000mL of refined cotton wastewater at 50 ℃ into a beaker, then adding 1000mL of nitrocotton acid wastewater at 50 ℃ and uniformly mixing, then adding 0.32g of benzalkonium chloride and uniformly mixing, wherein the pH value of the formed mixed solution is 3.75, and the concentration of the benzalkonium chloride in the mixed solution is 80 mg/L;
(2) and (2) placing the mixed solution formed in the step (1) into a 50 ℃ constant-temperature water bath kettle, standing for 75min to separate out and completely precipitate pollutants in the mixed solution, then performing suction filtration by using fine filter cloth, separating the supernatant from the precipitated pollutants, wherein the volume of the separated supernatant is 1800mL, the pH value of the supernatant is 3.70 through detection, the COD content is 4410.54mg/L, and the removal rate of the pollutants in the embodiment is 78.00 through calculation.
The removal rate of the contaminants in the above examples was calculated according to the following formula:
the pollutant removal rate (%) - (reduction amount of pollutant in wastewater/theoretical amount of pollutant in wastewater) × 100%,
the theoretical amount of the pollutants in the wastewater is (the COD content of the purified cotton wastewater to be treated is multiplied by the volume of the purified cotton wastewater to be treated) + (the COD content of the added acid wastewater of the nitrocotton is multiplied by the volume of the added acid wastewater of the nitrocotton),
the reduction of the pollutants in the wastewater is the theoretical amount of pollutants in the wastewater- (COD content of the supernatant x volume of the supernatant).
It should be noted that: in the existing method for treating purified cotton wastewater, the COD removal rate is usually adopted to represent the treatment effect of the purified cotton wastewater, but the treatment effect of the high-concentration purified cotton alkaline wastewater cannot be accurately summarized by the COD removal rate, for example, 1000mL of high-concentration purified cotton alkaline wastewater with the COD content of 50000mg/L is detected to have the COD content of 6000-7000 mg/L when being diluted by ten times to 10L of the volume. Therefore, in the embodiment of the invention, the sewage treatment effect of the technical scheme of the invention is embodied by adopting the pollutant removal rate.
Claims (3)
1. A method for treating purified cotton wastewater, which is strong-alkaline wastewater with high COD content generated in the production process of purified cotton, is characterized by comprising the following process steps:
(1) adding benzalkonium chloride and nitrocotton acid wastewater with the temperature not lower than 50 ℃ into refined cotton wastewater with the temperature not lower than 50 ℃ and uniformly mixing to form a mixed solution, wherein the adding amount of the nitrocotton acid wastewater reaches 1-4 according to the pH value of the mixed solution, and the adding amount of the benzalkonium chloride reaches 40-160 mg/L according to the concentration of the benzalkonium chloride in the mixed solution;
or adding benzalkonium chloride, nitrocotton acid wastewater at the temperature of not less than 50 ℃ and sulfuric acid into the refined cotton wastewater at the temperature of not less than 50 ℃ and uniformly mixing to form a mixed solution, wherein the adding amount of the nitrocotton acid wastewater and the sulfuric acid reaches 1-4 according to the pH value of the mixed solution, and the adding amount of the benzalkonium chloride reaches 40-160 mg/L according to the concentration of the benzalkonium chloride in the mixed solution;
(2) and (2) standing the mixed solution formed in the step (1) at the temperature of not lower than 50 ℃ until pollutants in the mixed solution are separated out and completely precipitated, and then separating the supernatant from the precipitated pollutants, wherein the separated supernatant is the treated waste liquid.
2. The method for treating purified cotton wastewater according to claim 1, wherein benzalkonium chloride is added to purified cotton wastewater at a temperature of not less than 50 ℃ and mixed uniformly, and then nitrocotton acidic wastewater at a temperature of not less than 50 ℃ or nitrocotton acidic wastewater at a temperature of not less than 50 ℃ and sulfuric acid are added.
3. The method for treating purified cotton wastewater according to claim 1, wherein the purified cotton wastewater at a temperature of not less than 50 ℃ is added with the nitro-cotton acidic wastewater at a temperature of not less than 50 ℃, or with the nitro-cotton acidic wastewater at a temperature of not less than 50 ℃ and sulfuric acid to form a mixed solution having a pH value of 1-4, and then benzalkonium chloride is added.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4134786A (en) * | 1976-12-15 | 1979-01-16 | Nasa | Process for purification of waste water produced by a Kraft process pulp and paper mill |
| SU937437A1 (en) * | 1980-12-01 | 1982-06-23 | Всесоюзное научно-производственное объединение целлюлозно-бумажной промышленности | Process for purifying effluents of sulphate cellulose production |
| CN1268199A (en) * | 1997-05-29 | 2000-09-27 | 邦蒂富尔应用研究公司 | Process for treating spent,waste, alkaline digestion liquid from paper pulping operations and product |
| CN102267780B (en) * | 2011-06-24 | 2013-01-30 | 北京中兵北方环境科技发展有限责任公司 | Treatment method for wastewater containing refined cotton |
| CN102583600B (en) * | 2012-03-22 | 2013-09-04 | 杭州一清环保工程有限公司 | Composite purifying agent used for purifying sewage in river channel |
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