CN-119118278-B - Coking wastewater purifying agent and preparation method and application thereof

CN119118278BCN 119118278 BCN119118278 BCN 119118278BCN-119118278-B

Abstract

The invention discloses a coking wastewater purifying agent and a preparation method and application thereof, wherein the purifying agent comprises the following raw materials, by weight, 20-25 parts of active carbon, 18-25 parts of a compound, 4-9 parts of polyacrylamide, 1-5 parts of a surfactant and 60-90 parts of water, wherein the compound is compounded by pear residues and modified shell carbon. The invention is used for solving the technical problem that the coking wastewater can not reach the discharge standard.

Inventors

WANG CHONGPU
LU YUNHONG
WANG FENG
Kong Xinghua
Ni Jingze
LI HUANHUAN
FAN LIHUI
JIA SIWEI

Assignees

河北协同水处理技术有限公司

Dates

Publication Date: 20260508
Application Date: 20240911

Claims (4)

1. The coking wastewater purifying agent is characterized by comprising, by weight, 20-25 parts of active carbon, 18-25 parts of a compound, 4-9 parts of polyacrylamide, 1-5 parts of a surfactant and 60-90 parts of water, wherein the compound is compounded by pear residues and modified shell carbon; the compound is prepared by the following method: a1, crushing the modified shell carbon, and sieving to obtain crushed modified shell carbon; A2, cleaning, drying, crushing, sieving, putting into ethanol solution, and uniformly mixing to obtain mixed solution; a3, putting the crushed modified shell carbon into the mixed solution, uniformly mixing, heating, reacting, cooling, centrifuging, washing and drying to obtain a compound; the weight ratio of the pear residue to the modified shell carbon is (0.4-0.7): 1; the modified shell carbon is prepared by the following method: b1, cleaning, crushing and sieving apricot shells and walnut shells, and uniformly mixing to obtain the apricot shells and the walnut shells in a weight ratio of 1:1; B2, heating the shells under the protection of inert gas, cooling, and carbonizing to obtain shell carbon; b3, adding an activating agent into the shell carbon, grinding and mixing, heating again to raise the temperature, reacting, cooling, washing and drying to obtain modified shell carbon; the pear residue is further subjected to modification treatment before use by putting the pear residue into glycol solution, adding alpha-hydroxyl ferric oxide, uniformly mixing, heating to raise the temperature, reacting, taking out solid matters after the reaction is finished, cooling, washing and drying to obtain modified pear residue; The pear residue is pretreated by adopting the following method before use, namely, the pear residue is washed, put into hydrochloric acid solution, uniformly mixed, subjected to water bath reaction, taken out of solid matters after the reaction is finished, washed and dried, and the pretreated pear residue is obtained.
2. A method for preparing a coking wastewater purifying agent according to claim 1, which is characterized by comprising the following steps of putting active carbon, a compound, polyacrylamide and a surfactant into water, and uniformly mixing to obtain the purifying agent.
3. The method for purifying coking wastewater according to claim 2, wherein the method comprises the steps of adding the purifying agent into coking wastewater to be treated, mixing uniformly, aerating, standing, and filtering to obtain the coking wastewater after treatment.
4. The method of claim 3, wherein the amount of the purifying agent is 0.4-0.7wt% of the coking wastewater to be treated.

Description

Coking wastewater purifying agent and preparation method and application thereof Technical Field The invention belongs to the technical field of wastewater treatment, and particularly relates to a coking wastewater purifying agent and a preparation method and application thereof. Background Coking wastewater is wastewater of a large amount of aromatic compounds and heterocyclic compounds generated in the processes of coke making by coal, gas purification and coking product recovery, and belongs to high-concentration organic wastewater difficult to degrade. Domestic coking wastewater is discharged after being treated by adopting a biological method, and the technology is one of the common technologies in the coking industry at present. At present, most of organic matters are degraded after biochemical treatment of coking wastewater, but COD, chromaticity and turbidity indexes still cannot reach national emission standards, further treatment is needed, and the treatment method is mainly to adopt a mode of adding a single medicament or a decolorizing agent for purification. Disclosure of Invention The invention provides a coking wastewater purifying agent, a preparation method and application thereof, which are used for solving the technical problem that the existing coking wastewater cannot reach the national discharge standard. The coking wastewater purifying agent provided by the invention comprises, by weight, 20-25 parts of active carbon, 18-25 parts of a compound, 4-9 parts of polyacrylamide, 1-5 parts of a surfactant and 60-90 parts of water, wherein the compound is compounded by pear residues and modified shell carbon. Alternatively, the complex is prepared using the following method: a1, crushing the modified shell carbon, and sieving to obtain crushed modified shell carbon; A2, cleaning, drying, crushing, sieving, putting into ethanol solution, and uniformly mixing to obtain mixed solution; A3, putting the crushed modified shell carbon into the mixed solution, uniformly mixing, heating, reacting, cooling, centrifuging, washing and drying to obtain the compound. Further, the complex is prepared by the following method: A1, crushing modified shell carbon, and sieving the crushed modified shell carbon with a 80-120-mesh sieve to obtain crushed modified shell carbon; a2, cleaning, drying, crushing and sieving the pear residues with a 80-120 mesh sieve, putting the pear residues into an ethanol solution, and uniformly mixing to obtain a mixed solution; a3, putting the crushed modified shell carbon into the mixed solution, uniformly mixing, heating to 40-60 ℃, reacting for 1-2h, cooling to 22+/-3 ℃, centrifuging, washing with water for 3-5 times, and drying to obtain a compound; Wherein the addition amount of the ethanol solution in each 1g of pear residues in the step A2 is 3-5mL, and the mass fraction of the ethanol solution is 40%. Optionally, the weight ratio of the pear residues to the modified shell carbon is (0.4-0.7): 1. Optionally, the shell carbon is a mixture of charred apricot shells and walnut shells, and the weight ratio of the apricot shells to the walnut shells is 1:1. Optionally, the modified shell carbon is prepared by the following method: B1, cleaning apricot shells and walnut shells, crushing, sieving and uniformly mixing to obtain the shells; B2, heating the shells under the protection of inert gas, carbonizing, and cooling to obtain shell carbon; And B3, adding an activating agent into the shell carbon, grinding and mixing, heating again to raise the temperature, reacting, cooling, washing and drying to obtain the modified shell carbon. Further, the modified shell carbon is prepared by the following method: b1, cleaning apricot shells and walnut shells, crushing, sieving with a 100-120 mesh sieve, and uniformly mixing to obtain the shells; B2, heating the shell to 450-650 ℃ under the protection of inert gas nitrogen, carbonizing for 2-3h, and cooling to 22+/-3 ℃ to obtain shell carbon; B3, adding an activating agent into the shell carbon, grinding and mixing, heating again to 750-850 ℃, reacting for 1-3 hours, cooling to 22+/-3 ℃, washing with water for 3-5 times, and drying to obtain modified shell carbon; Wherein the activator is potassium hydroxide, and the weight ratio of the shell carbon to the potassium hydroxide is 1 (0.4-0.6). Optionally, before use, the pear residues are further subjected to modification treatment, namely, the pear residues are put into glycol solution, alpha-ferric oxide hydroxide is added, the mixture is uniformly mixed, the mixture is heated and heated, the reaction is completed, and after the reaction is completed, the solid is taken out, cooled, washed and dried, so that the modified pear residues are obtained. Further, the pear residue is subjected to modification treatment before use by putting the pear residue into glycol solution, adding alpha-hydroxyl ferric oxide, uniformly mixing, heating to 100-140 ℃, reacting for 5-7h, taking out solid matters