CN213357183U

CN213357183U - Cold polymerization resin high concentration fluorine-containing wastewater treatment device

Info

Publication number: CN213357183U
Application number: CN202022207600.9U
Authority: CN
Inventors: 胡国金; 张卫东; 王伟龙; 施全宝; 吴建坡; 游卓霖; 王先武; 陶杰斌
Original assignee: Karamay Tianli Henghua Petrochemical Co ltd
Current assignee: Xinjiang Tianli Petrochemical Co.,Ltd.
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-06-04
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a cold polymerization resin high-concentration fluorine-containing wastewater treatment device, which comprises a heat exchanger, a buffer tank, a cavitation air flotation machine, a dissolved air flotation machine, a primary reactor and a primary settling tank which are connected by pipelines in sequence; the upper part of the primary settling tank is connected with a secondary reactor; the secondary reactor is connected with a secondary settling tank, the upper part of the secondary settling tank is connected with a clean water tank, and the primary settling tank and the bottom of the secondary settling tank are connected with a filter press through a filter press feed pump; the utility model has the advantages that: for high concentrations produced in industrial processesSewage containing fluorine, using CaCl₂Reacting with fluorinion in sewage to generate calcium fluoride slightly soluble matter, and flocculating and settling the calcium fluoride slightly soluble matter by using flocculating agents PAC and PAM to achieve the aim of removing fluorine.

Description

Cold polymerization resin high concentration fluorine-containing wastewater treatment device

Technical Field

The utility model relates to a waste water treatment device, in particular to a cold-polymerization resin high-concentration fluorine-containing waste water treatment device, which belongs to the field of waste water treatment devices.

Background

In the production process of the C9 cold polymerization resin cold polymerization, boron trifluoride diethyl etherate is used as a catalyst, and after the reaction is finished, excess sodium hydroxide solution is used for washing off boron trifluoride in a reaction solution. In the wastewater generated by alkaline washing, the resin liquid content is high and reaches more than 200 mg/L; the fluorine content is higher and reaches 6000-8800 mg/L. After directly entering biochemical sewage treatment, the resin liquid has high viscosity and is adhered to each equipment pipeline of a biochemical system, thereby not only influencing the normal operation of a sewage treatment plant, but also ensuring that the sewage discharge reaches the national discharge requirement of less than 10mg/L on the fluorine-containing sewage. At present, no method for effectively treating resin fluorine-containing sewage exists in China, most of the resin fluorine-containing sewage enters a sewage treatment plant with large treatment capacity for treatment, and the method is equivalent to a dilution method for reducing the influence on the sewage treatment plant.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to design a cold resin high concentration fluoride wastewater treatment device that gathers, get rid of the fluorinion in the waste water, solve the problem of going to of the cold resin device fluoride sewage that gathers of C9, guarantee the normal operating in sewage treatment field, ensure waste water discharge to reach standard.

The technical scheme of the utility model is that:

the cold polymerization resin high-concentration fluorine-containing wastewater treatment device comprises a heat exchanger, a buffer tank, a cavitation air flotation machine, a dissolved air flotation machine, a primary reactor and a primary settling tank which are sequentially connected through pipelines; the upper part of the primary settling tank is connected with a secondary reactor; the secondary reactor is connected with a secondary settling tank, the upper part of the secondary settling tank is connected with a clean water tank, and the bottoms of the primary settling tank and the secondary settling tank are connected with a filter press through a filter press feed pump.

The working process is as follows: cooling the fluorine-containing sewage to 30-40 ℃ in a heat exchanger; buffering in a buffer tank; adjusting pH to 8-9 in a cavitation air flotation machine, and adding a flocculating agent such as polyaluminum ferric chloride and polyacrylamide to remove oil; further removing oil by utilizing efficient dissolved air flotation in a dissolved air flotation machine; adding 20-35ppm polyacrylamide, 400-600ppm polyaluminium ferric chloride and calcium chloride into a primary reactor for reaction; the reaction liquid enters a primary settling tank for settling for 4-6 hours;

the supernatant fluid of the primary settling tank automatically flows into a secondary reactor, and 10-15ppm polyacrylamide as a flocculating agent, 200-300ppm polyaluminium ferric chloride and calcium chloride are continuously added for secondary reaction; the reaction liquid in the first-stage settling tank enters a second-stage settling tank for settling for 4-6 hours; the supernatant of the secondary sedimentation tank automatically flows into a clean water tank; and the sludge in the two settling tanks enters a filter press through a filter press feeding pump for filter pressing, and the filter cake is packaged and transported outside.

The utility model has the advantages that: is used for high-concentration fluorine-containing sewage generated in the industrial production process and utilizes CaCl₂Reacting with fluorinion in sewage to generate calcium fluoride slightly soluble matter, and flocculating and settling the calcium fluoride slightly soluble matter by using flocculating agents PAC and PAM to achieve the aim of removing fluorine.

The present invention will be further explained with reference to the drawings and examples.

Drawings

FIG. 1 is a schematic structural diagram of a cold polymerization resin high-concentration fluorine-containing wastewater treatment device according to an embodiment of the present invention.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is not intended to limit the invention.

Example 1

As shown in figure 1, the device for treating the cold polymerization resin high-concentration fluorine-containing wastewater comprises a heat exchanger E-1, a buffer tank V-1, a cavitation air flotation machine AF-1, a dissolved air flotation machine AF-2, a primary reactor R-1 and a primary settling tank V-2 which are connected in sequence through pipelines; the upper part of the primary settling tank V-2 is connected with a secondary reactor R-2; the secondary reactor R-2 is connected with a secondary settling tank V-3, the upper part of the secondary settling tank V-3 is connected with a clean water tank V-4, and the primary settling tank V-2 and the bottom of the secondary settling tank V-3 are connected with a filter press FP-1 through a filter press feed pump P-2.

The working process is as follows:

the sewage with high pH value (pH is more than 12), high temperature (75-80 ℃), oil content (more than 30 mg/L) and fluorine content (6000-8800 ppm) from the C9 cold polymerization resin device is cooled to 30-40 ℃ through a heat exchanger E-1 and enters a buffer tank V-1. Sewage from the buffer tank V-1 enters an air flotation machine AF-1, a sulfuric acid filling point and a stirring motor are arranged at the top of the air flotation machine AF-1, the pH of the air flotation machine AF-1 is controlled to be 8-9, an online pH value online instrument is arranged at the upper part of the air flotation machine AF-1, a variable-frequency diaphragm metering pump is adopted as a sulfuric acid filling pump, and the pH value of the air flotation machine AF-1 is accurately controlled through automatic control. Adding a flocculating agent from the top of the air floatation machine AF-1, and enriching and removing the oil phase at the top under the stirring action. An outlet of the air floatation machine AF-1 enters a secondary air floatation machine AF-2, and floating oil in the sewage is further removed by utilizing the secondary high-efficiency dissolved air floatation machine AF-2.

An outlet of the second-stage air flotation machine AF-2 is conveyed to a first-stage reactor R-1 through a lifting pump P-1, calcium chloride, 20-35ppm polyacrylamide and 400-600ppm polyaluminium chloride iron are added for flocculation reaction, stirring is arranged in the first-stage reactor R-1, the calcium chloride and a flocculating agent are ensured to be fully reacted in sewage, and calcium fluoride is also ensured not to be deposited at the bottom of the reactor. Then flows into a first-stage sedimentation tank V-2, and is settled for 4-6 hours for mud-water separation; the removal rate of the fluorinion is 90-95% through a first-stage reaction and a sedimentation tank. Meanwhile, fresh water is arranged in the first-stage reactor R-1, and the fresh water is mainly used for diluting air flotation effluent to provide the operation requirement of the subsequent process.

The effluent of the primary sedimentation tank V-2 automatically flows into a secondary reactor R-2, calcium chloride, 10-15ppm polyacrylamide and 200-300ppm polyaluminium chloride iron are added into the secondary reactor R-2 for flocculation reaction, and then the effluent enters a secondary sedimentation tank V-3 for sedimentation for 4-6h, so that the aim of further reducing the concentration of fluorine ions is fulfilled. The effluent of the secondary sedimentation tank V-3 automatically flows into a clean water tank V-4, and is discharged after the sewage reaches the standard.

And the sludge in the mud hoppers of the primary sedimentation tank V-2 and the secondary sedimentation tank V-3 is respectively conveyed to a plate-and-frame filter press FP-1 through a lifting pump P-2 for dehydration treatment, the water content of the dehydrated sludge is lower than 70 percent, and the sludge is transported to a qualified unit for treatment.

The resin oil in the high-concentration fluorine-containing sewage is recycled, the pH value of the discharged sewage is adjusted to 6-10, and the fluorine content in the sewage is removed to be less than 50ppm, so that the aim of directly entering a sewage treatment biochemical unit is fulfilled.

During three start-up processes of 5-6 months in 2018, 11-2020 and 1 months in 2019 and 7-9 months in 2020, fluorine content of fluorine-containing sewage entering the device is 6000-8800ppm, fluorine content of effluent water treated by the device is within 50ppm, oil in water is within 30mg/L, and COD is within 1500 mg/L. The analytical data are as follows:

Claims

1. cold high concentration fluorine-containing effluent treatment plant of gathering resin, its characterized in that: comprises a heat exchanger, a buffer tank, a cavitation air flotation machine, a dissolved air flotation machine, a primary reactor and a primary settling tank which are connected in sequence by pipelines; the upper part of the primary settling tank is connected with a secondary reactor; the secondary reactor is connected with a secondary settling tank, the upper part of the secondary settling tank is connected with a clean water tank, and the bottoms of the primary settling tank and the secondary settling tank are connected with a filter press through a filter press feed pump.