CN109019946B - Method for reducing suspended particles in wastewater produced by wet white carbon black production - Google Patents
Method for reducing suspended particles in wastewater produced by wet white carbon black production Download PDFInfo
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- CN109019946B CN109019946B CN201810650954.5A CN201810650954A CN109019946B CN 109019946 B CN109019946 B CN 109019946B CN 201810650954 A CN201810650954 A CN 201810650954A CN 109019946 B CN109019946 B CN 109019946B
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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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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a method for reducing suspended particles in white carbon black production wastewater by a wet method. The method uses the modified wood powder and the zeolite powder as flocculating agents to flocculate the white carbon black production wastewater in sequence, the flocculated wastewater has good settleability, the sludge is easy to dewater, and the suspended matter content of the supernatant is low.
Description
Technical Field
The invention belongs to the field of industrial wastewater, and particularly relates to a method for reducing suspended particles in wastewater produced by wet white carbon black.
Background
The white carbon black is a general term for white powdery X-ray amorphous silicic acid and silicate products, mainly refers to precipitated silica, fumed silica and ultrafine silica gel, and also includes powdery synthetic aluminum silicate and calcium silicate, etc., and the composition can be SiO2·nH2O represents, wherein nH2O is present in the form of surface hydroxyl groups.
The precipitated white carbon black is prepared from sulfuric acid, hydrochloric acid and CO2The silicon dioxide produced by taking water glass as a basic raw material exists in an amorphous microporous powder form, and the main production process comprises the following steps: the industrial water glass is prepared by the reaction of quartz sand and soda ash under the condition of high temperature, the water glass is diluted to a certain concentration by water, acid liquor is added to generate silicon dioxide precipitate, and then the product white carbon black is prepared by cleaning, filtering, drying (drying or spraying) and crushing.
In the mother liquor filter pressing process in the white carbon black production process, a part of very fine silicon dioxide particles can enter wastewater through the filter cloth, a small amount of silicon dioxide particles can enter wastewater in the cleaning process, and the fine silicon dioxide particles are the main source of suspended matters in the white carbon black production wastewater. As the white carbon black particles are very fine, the effect of flocculating agents such as polyaluminium chloride, polyacrylamide and the like used for precipitating white carbon black wastewater is poor, the dehydration property of precipitated sludge is poor, and filtrate in the filter pressing process still contains a large amount of suspended matters. The treatment cost of sand filtration, microfiltration and other methods is too high and uneconomical.
Disclosure of Invention
The invention aims to solve the problems and provides a method for reducing suspended particles in waste water produced by wet white carbon black.
The purpose of the invention is realized by the following technical scheme:
a method for reducing suspended particles in white carbon black production wastewater by a wet process comprises the steps of adjusting the pH value of the white carbon black production wastewater, adding a modified wood powder flocculating agent for primary flocculation, adding zeolite powder for secondary flocculation, precipitating after the secondary flocculation, and performing plate-and-frame filter pressing dehydration on precipitated sludge.
Further, adjusting the pH value of the white carbon black production wastewater to 8-8.5;
the volume ratio of the white carbon black production wastewater to the modified wood powder flocculating agent is 100: 1-1.5;
the first flocculation time is 8-10 min.
Furthermore, the preparation method of the modified wood flour flocculating agent comprises the following steps: mixing wood powder and ethanol, heating the mixture of the wood powder and the ethanol to 190-; adding potassium persulfate and polyacrylamide into the obtained carboxylation product, reacting for 1.5h at 50-52 ℃, and then diluting with water to obtain the modified wood powder flocculant.
Further, the concentration of the sodium hydroxide solution is 20 wt%, and the mass ratio of the wood powder to the ethanol to the sodium hydroxide solution is 1:1: 2;
the concentration of the chloroacetic acid solution is 10 wt%, and the mass ratio of the wood powder to the chloroacetic acid solution is 1: 1;
the mass ratio of the wood powder to the potassium persulfate to the polyacrylamide is 1:0.01: 0.2;
the amount of dilution water is 100 times the volume of the material to be diluted.
Furthermore, the dosage of the zeolite powder in each 1L of white carbon black wastewater is 0.07-0.1 g;
the second flocculation time is 3-5 min.
Further, the precipitation time is 2-4 h.
The method comprises the steps of firstly flocculating the white carbon black production wastewater by using modified wood powder, wherein lignin in plant fibers is a polyaromatic compound and has a spatial network structure, the wood powder is grafted with polyacrylamide, the obtained modified wood powder flocculating agent contains a large amount of amino, carboxyl and other groups, and can be bonded with hydroxyl on the surface of white carbon black to form larger particles, and the zeolite powder is used for increasing the specific gravity and the settling velocity of the flocculate. In the precipitated sludge after the secondary flocculation precipitation, floccules are large, small white carbon black particles are not easy to pass through filter cloth during filter pressing, and the dewatering property is good.
The invention has the following beneficial effects:
the method for reducing suspended particles in waste water produced by wet white carbon black provided by the invention uses the modified wood powder and the zeolite powder as flocculating agents to flocculate the waste water produced by the white carbon black in sequence, the flocculated waste water has good settleability, the sludge is easy to dewater, and the suspended matter content of the supernatant is low.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
The preparation method of the modified wood powder in the embodiment comprises the following steps: 100g of wood powder and 100g of absolute ethyl alcohol are fully stirred and mixed, the wood powder is 300 meshes, 200g of 20 wt% sodium hydroxide solution (40g of sodium hydroxide is dissolved in 160mL of water) is slowly added after the wood powder is heated to 190-200 ℃, and the mixture is subjected to alkalization reaction for 1h after mixing. After the alkalization reaction, 100g of chloroacetic acid solution with the concentration of 10 wt% (10g of chloroacetic acid is dissolved in 90mL of water) is added for reaction for 2h at the temperature of 95-100 ℃, and a carboxylation product is obtained. Adding 1g of potassium persulfate and 20g of polyacrylamide into the carboxylation product, uniformly mixing, and reacting for 1.5h at 50-52 ℃. And (3) diluting the obtained material with water with the volume of 100 times after the reaction is finished, and thus obtaining the catalyst.
The white carbon black production wastewater is obtained by filter pressing of mother liquor in the white carbon black production process by a sulfuric acid method, the pH value is 7.4, and the SS concentration is 650 mg/L.
The white carbon black production wastewater is treated by the 3 methods of the embodiment.
Example 1
A method for reducing suspended particles in white carbon black production wastewater by a wet method comprises the steps of adjusting the pH value of the white carbon black production wastewater to 8.2, adding the modified wood powder flocculating agent accounting for 1% of the volume of the white carbon black production wastewater, and slowly stirring and flocculating for 8 min. Then adding zeolite powder of 300 meshes into the wastewater, wherein the adding amount of the zeolite powder is calculated by 0.07g per 1L of the wastewater, and slowly stirring for flocculation for 3 min. And precipitating the flocculated wastewater for 4 hours, discharging supernatant, and performing plate-and-frame filter pressing on precipitated sludge.
Example 2
A method for reducing suspended particles in waste water produced by wet white carbon black comprises the steps of adjusting the pH value of the waste water produced by the white carbon black to 8.0, adding the modified wood powder flocculating agent accounting for 1.2% of the volume of the waste water based on the volume of the waste water produced by the white carbon black, and slowly stirring and flocculating for 8 min. Then adding zeolite powder of 300 meshes into the wastewater, wherein the adding amount of the zeolite powder is calculated by 0.08g of wastewater per 1L, and slowly stirring for flocculation for 4 min. And precipitating the flocculated wastewater for 3 hours, discharging supernatant, and performing plate-and-frame filter pressing on precipitated sludge.
Example 3
A method for reducing suspended particles in waste water produced by wet white carbon black comprises the steps of adjusting the pH value of the waste water produced by the white carbon black to 8.5, adding the modified wood powder flocculating agent accounting for 1.5% of the volume of the waste water produced by the white carbon black, and slowly stirring and flocculating for 10 min. Then adding zeolite powder of 300 meshes into the wastewater, wherein the adding amount of the zeolite powder is calculated by 0.1g of wastewater per 1L, and slowly stirring for flocculation for 5 min. And precipitating the flocculated wastewater for 2 hours, discharging supernatant, and performing plate-and-frame filter pressing on precipitated sludge.
Results
SS, the water content of precipitated sludge, SS of sludge press filtration filtrate and the water content of filter cakes before and after treatment of white carbon black production wastewater are shown in the following table.
As can be seen from the above table, the method provided by the invention has the advantages that the removal rate of suspended particulate matters in the wastewater from the production of the white carbon black reaches more than 95%, the sludge dewatering property is good, and white carbon black particles are not easy to permeate through the filter cloth and enter the wastewater again in the sludge filter pressing process.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the 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 (2)
1. A method for reducing suspended particles in white carbon black production wastewater by a wet process is characterized by adjusting the pH value of the white carbon black production wastewater, adding a modified wood powder flocculating agent for primary flocculation, then adding zeolite powder for secondary flocculation, precipitating after the secondary flocculation, and performing plate-and-frame filter pressing dehydration on precipitated sludge;
adjusting the pH value of the white carbon black production wastewater to 8-8.5;
the volume ratio of the white carbon black production wastewater to the modified wood powder flocculating agent is 100: 1-1.5;
the first flocculation time is 8-10 min;
the dosage of the zeolite powder in each 1L of white carbon black wastewater is 0.07-0.1 g;
the second flocculation time is 3-5 min;
the precipitation time is 2-4 h;
the preparation method of the modified wood powder flocculating agent comprises the following steps: mixing wood powder and ethanol, heating the mixture of the wood powder and the ethanol to 190-; adding potassium persulfate and polyacrylamide into the obtained carboxylation product, reacting for 1.5h at 50-52 ℃, and then diluting with water to obtain the modified wood powder flocculant.
2. The method for reducing the suspended particles in the wastewater produced by wet white carbon black according to claim 1, wherein the concentration of the sodium hydroxide solution is 20 wt%, and the mass ratio of the wood powder to the ethanol to the sodium hydroxide solution is 1:1: 2;
the concentration of the chloroacetic acid solution is 10 wt%, and the mass ratio of the wood powder to the chloroacetic acid solution is 1: 1;
the mass ratio of the wood powder to the potassium persulfate to the polyacrylamide is 1:0.01: 0.2;
the amount of dilution water is 100 times the volume of the material to be diluted.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082121A (en) * | 1992-07-10 | 1994-02-16 | S·C·瓦德哈万 | The treatment process of spent pickle liquor |
| CN104986939A (en) * | 2015-07-03 | 2015-10-21 | 天津霍普环保科技有限公司 | Preparing method for modified wood powder amphiprotic dehydrating agent |
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| US9738553B2 (en) * | 2012-03-16 | 2017-08-22 | Aquatech International, Llc | Process for purification of produced water |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082121A (en) * | 1992-07-10 | 1994-02-16 | S·C·瓦德哈万 | The treatment process of spent pickle liquor |
| CN104986939A (en) * | 2015-07-03 | 2015-10-21 | 天津霍普环保科技有限公司 | Preparing method for modified wood powder amphiprotic dehydrating agent |
Non-Patent Citations (1)
| Title |
|---|
| 榆树皮胶粉制备改性天然高分子絮凝剂;潘碌亭;《工业水处理》;20130331;第33卷(第3期);第17-20页 * |
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