CN112897800A

CN112897800A - Chemical industry park nanotube wastewater treatment system and treatment process

Info

Publication number: CN112897800A
Application number: CN202110032973.3A
Authority: CN
Inventors: 吴智仁; 李俊波; 陈园园; 蒋素英; 齐元峰
Original assignee: Jiangsu Atk Environmental Engineering Design & Research Institute Co ltd; ATK Holdings Group Co Ltd
Current assignee: Jiangsu Atk Environmental Engineering Design & Research Institute Co ltd; ATK Holdings Group Co Ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-06-04

Abstract

The invention discloses a system and a process for treating nanotube wastewater in a chemical industrial park. Comprising S1, adjusting the wastewater to be treated to acidity in an adjusting tank; s2, pumping the regulated wastewater into a water inlet area through a lift pump, sequentially immersing the water inlet area and a filler area from bottom to top to enter a water outlet area along with the increase of the pumped wastewater, and refluxing part of the wastewater into the water inlet area through a reflux port and a reflux pipe; monitoring the water inflow through an ORP monitor, and performing back washing treatment on the reduction tower; s3, allowing the wastewater in the water outlet area to enter a coagulation air floatation tank through a water outlet, and sequentially passing through a coagulation area, a flocculation area and a precipitation area; removing suspended matters in the wastewater in a precipitation zone, pumping supernatant generated after precipitation into a biological tank reactor through a lift pump, and monitoring a DO value through a dissolved oxygen detector; s4, carrying out biochemical treatment on the wastewater in the biological tank reactor to realize COD degradation and total nitrogen removal, and finally entering a secondary sedimentation tank to finish the treatment of the nanotube wastewater.

Description

Chemical industry park nanotube wastewater treatment system and treatment process

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a system and a process for treating nanotube wastewater in a chemical industry park.

Background

The wastewater in the chemical industry park generally needs to be treated in respective factories to enable the wastewater to reach the nano-tube standard, and then is treated in a unified way in the sewage treatment plants in the chemical industry park to enable the wastewater to reach the relevant discharge standard. In general, typical treatment processes in respective factories are physicochemical pretreatment, biochemical treatment and advanced oxidation treatment, and related membrane treatment processes exist when reclaimed water is recycled, and effluent water reaches the nano-tube requirement and is discharged to sewage treatment plants in gardens. The wastewater of the type generally contains a large amount of pollutants with characteristics of difficult degradation, has low BOD and poor biodegradability, and can greatly inhibit the respiration rate of microorganisms if being directly subjected to biochemical treatment, so that the treatment effect is poor.

Disclosure of Invention

The invention aims to provide a system and a process for treating nanotube wastewater in a chemical industrial park, which can remove COD and realize high-degree denitrification.

The invention is realized by the following technical scheme:

a nano-tube wastewater treatment system in a chemical industrial park is characterized by comprising an adjusting tank, a reduction tower, a coagulation air flotation tank, a biological tank reactor and a secondary sedimentation tank; a lifting pump for pumping the wastewater into the reduction tower is arranged in the regulating tank; the interior of the reduction tower is divided into a water inlet area, a filler area and a water outlet area which are communicated with each other from bottom to top; a return pipe and a back flushing pipe are arranged in the water inlet area; the filler area is filled with an iron-copper-based reduction filler; a water outlet, a backflow port and a backwashing water outlet are arranged in the water outlet area; an ORP monitor is also arranged in the water outlet zone; the return pipe is connected with the return port and is used for returning part of the wastewater in the water outlet area to the water inlet area; the coagulation air floatation tank comprises a coagulation area, a flocculation area and a sedimentation area which are arranged in sequence; a lifting pump for pumping the supernatant after precipitation into the biological tank reactor is arranged in the precipitation zone; biological fillers are added into the biological tank reactor; an aeration device and a dissolved oxygen detector are also arranged in the biological tank reactor; the secondary sedimentation tank is communicated with the biological tank reactor. Specifically, the wastewater subjected to reduction treatment by the iron-copper-based reduction filler in the reduction tower automatically flows through coagulation, flocculation and precipitation, and then the supernatant is lifted into the biological tank reactor by a lift pump, an online dissolved oxygen detector and an aeration device are arranged in the biological tank reactor, and the wastewater is subjected to biochemical treatment at the stage to realize COD degradation and total ammonia nitrogen removal. In order to enhance the hydraulic agitation effect, it is preferable that the return pipe and the return port are provided in the reduction tower. Specifically, the iron-copper-based reduction filler is used for pretreating refractory characteristic pollutants in the wastewater, so that the biodegradability of the wastewater can be improved.

Furthermore, the porosity of the iron-copper-based reduction filler is 45-55%. Specifically, porosity refers to the proportion of the pores inside the material in the apparent volume of the particulate material to the total volume.

Furthermore, an aeration device is also arranged in the water inlet area.

Further, a partition plate is arranged in the biological tank reactor and is used for separating the biological filler from the aeration device. Specifically, the biological filler and the aeration device are separated by the partition plate, so that the biological filler can be prevented from being directly flushed by gas, and the structure of the biological filler can be damaged.

Further, the biological filler is basalt fiber, and the monofilament diameter of the basalt fiber is 5-10 μm.

A process for treating nanotube wastewater in a chemical industry park comprises the following steps:

s1, adjusting the wastewater to be treated to be acidic in the adjusting tank;

s2, pumping the regulated wastewater into the water inlet area through the lift pump, sequentially immersing the water inlet area and the filler area from bottom to top to enter the water outlet area along with the increase of the pumped wastewater, and refluxing part of the wastewater to the water inlet area through the reflux port and the reflux pipe; monitoring the water inflow through the ORP monitor, and performing back washing treatment on the reduction tower;

s3, the wastewater in the water outlet area enters the coagulation and floatation tank through the water outlet and sequentially passes through the coagulation area, the flocculation area and the sedimentation area; removing suspended matters in the wastewater in the precipitation zone, pumping supernatant generated after precipitation into the biological tank reactor through a lift pump, and monitoring a DO value through the dissolved oxygen detector;

s4, carrying out biochemical treatment on the wastewater in the biological tank reactor to realize COD degradation and total nitrogen removal, and finally entering the secondary sedimentation tank to finish the treatment of the nano-tube wastewater.

Further, step S1, adjusting the pH value of the wastewater to be treated to 3.0-5.0 in the adjusting tank.

Further, step S2, pumping the adjusted wastewater into the water inlet area through the lift pump, sequentially immersing the water inlet area and the filler area from bottom to top with the increase of the pumped wastewater into the water outlet area, and returning part of the wastewater to the water inlet area through the return port and the return pipe, wherein the return ratio is 1.0-3.0; the hydraulic retention time of the wastewater in the reduction tower is 0.5-3 hours; and monitoring by the ORP monitor, stopping water inflow when ORP normal state is higher than-50 mv, performing back washing treatment on the reduction tower through the back washing pipe, and then discharging back washing water from the back washing water outlet.

Further, step S3, when the pH of the wastewater in the effluent area is 8.0-9.0, the wastewater enters the coagulation and floatation tank through the water discharge port, and sequentially passes through the coagulation area, the flocculation area and the precipitation area; suspended matters in the wastewater are removed in the sedimentation zone, then supernatant generated after sedimentation is pumped into the biological tank reactor through the lift pump, and a DO value is monitored through the dissolved oxygen detector; the DO value is stabilized at 1.5-2.0 by the adjustment of the aeration device arranged in the biological tank reactor.

The invention has the beneficial effects that:

the nano-tube wastewater treatment system for the chemical industrial park, provided by the invention, has the advantages of low cost, simple process and excellent water treatment effect. The invention realizes effective nanotube wastewater treatment in chemical industry park by using the combination of the reduction tower filled with the iron-copper-based reduction filler and the biological tank reactor added with the basalt fiber filler, and can improve the biodegradability of wastewater by using the reduction tower filled with the iron-copper-based reduction filler to pretreat the pollutants with characteristics of difficult degradation in the wastewater. The N-N bond in azo dyes and the C-C bond in triarylmethane dyes can be destroyed, nitro substances can be reduced into corresponding amine substances, halogen of halogen substances can be removed, the cyclic structure of epoxy substances can be destroyed, and the like, so that the biodegradability of pollutants is improved. The pretreated wastewater enters a biological tank reactor, and the biological tank reactor can simultaneously culture various microorganisms with different dissolved oxygen requirements in the same reaction tank, thereby realizing high denitrification while removing COD.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a chemical industrial park nanotube wastewater treatment system according to the present invention.

In the figure: 1 regulating tank, 2 reducing tower, 3 coagulation air flotation tank, 4 biological tank reactor, 5 secondary sedimentation tank, 21 water inlet zone, 22 filler zone, 23 water outlet zone, 31 coagulation zone, 32 flocculation zone, 33 sedimentation zone.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A nano-tube wastewater treatment system in a chemical industrial park comprises a regulating tank 1, a reduction tower 2, a coagulation air flotation tank 3, a biological tank reactor 4 and a secondary sedimentation tank 5; a lifting pump for pumping the wastewater into the reduction tower 2 (namely into the water inlet area 21) is arranged in the adjusting tank 1; the interior of the reduction tower 2 is divided into a water inlet area 21, a filler area 22 and a water outlet area 23 which are communicated with each other from bottom to top; a return pipe, a backwashing pipe and an aeration device for increasing the contact between the wastewater and the air are arranged in the water inlet area 21; the filler region 22 is filled with an iron-copper-based reduction filler, and the porosity of the iron-copper-based reduction filler is 50%; the water outlet area 23 is provided with a water outlet, a reflux port and a back flush water outlet; an ORP monitor is also arranged in the water outlet zone 23; the return pipe is connected with the return port and is used for returning part of the wastewater in the water outlet area 23 to the water inlet area 2; the coagulation air flotation tank 3 comprises a coagulation area 31, a flocculation area 32 and a sedimentation area 33 which are arranged in sequence; a lifting pump for pumping the supernatant after precipitation into the biological tank reactor 4 is arranged in the precipitation zone 33; biological fillers are added into the biological tank reactor 4, the biological fillers are basalt fibers, and the monofilament diameter of the basalt fibers is 10 microns; the biological tank reactor 4 is also provided with an aeration device, a dissolved oxygen detector and a partition plate, wherein the partition plate is used for separating the basalt fiber from the aeration device and preventing gas from directly scouring the basalt fiber so as to destroy the basalt fiber structure; the secondary sedimentation tank 5 is communicated with the biological tank reactor 4.

The utility model provides a chemical industry garden nanotube waste water treatment process, adopts foretell processing system to carry out waste water treatment, and this technology includes the following step:

s1, firstly, adjusting the pH value of the wastewater to be treated to 3.5 in the adjusting tank 1; the wastewater to be treated is wastewater in a chemical industry park in Yangzhou city of Jiangsu province, and the wastewater contains characteristic pollutants such as nitrobenzene, chlorohydrocarbon, dichlorophenol and the like;

s2, pumping the regulated wastewater into the water inlet area 21 through the lift pump, sequentially immersing the water inlet area 21 and the filler area 22 (immersing the iron-copper-based reducing filler) from bottom to top to enter the water outlet area 23 along with the increase of the pumped wastewater, and refluxing a part of wastewater into the water inlet area 21 through the reflux port and the reflux pipe, wherein the reflux ratio is 2.0; the hydraulic retention time of the wastewater in the reduction tower 2 is 2 hours; monitoring by the ORP monitoring instrument, stopping water inflow when ORP normal state is higher than-50 mv, performing back washing treatment on the reduction tower 2 through the back washing pipe, and then discharging back washing water from the back washing water outlet; the B/C of the original wastewater treated by the step S2 is promoted to 0.33 from 0.076;

s3, when the pH value of the wastewater in the water outlet zone 23 is 8.5, the wastewater enters the coagulation and floatation tank 3 through the water outlet, and sequentially passes through the coagulation zone 31, the flocculation zone 32 and the sedimentation zone 33; suspended matters in the wastewater are removed in the settling zone 33, then supernatant generated after settling is pumped into the biological tank reactor 4 through the lift pump, and the DO value is monitored through the dissolved oxygen detector; the DO value is stabilized at 1.5 by the adjustment of the aeration device arranged in the biological tank reactor 4;

s4, performing biochemical treatment on the wastewater in the biological tank reactor 4 to realize COD degradation and total nitrogen removal, and finally entering the secondary sedimentation tank 5 to finish the treatment of the nanotube wastewater, wherein the final effluent reaches the first-level A standard.

Example 2

A nano-tube wastewater treatment system in a chemical industrial park comprises a regulating tank 1, a reduction tower 2, a coagulation air flotation tank 3, a biological tank reactor 4 and a secondary sedimentation tank 5; a lifting pump for pumping the wastewater into the reduction tower 2 (namely into the water inlet area 21) is arranged in the adjusting tank 1; the interior of the reduction tower 2 is divided into a water inlet area 21, a filler area 22 and a water outlet area 23 which are communicated with each other from bottom to top; a return pipe, a backwashing pipe and an aeration device for increasing the contact between the wastewater and the air are arranged in the water inlet area 21; the filler region 22 is filled with an iron-copper-based reduction filler, and the porosity of the iron-copper-based reduction filler is 55%; the water outlet area 23 is provided with a water outlet, a reflux port and a back flush water outlet; an ORP monitor is also arranged in the water outlet zone 23; the return pipe is connected with the return port and is used for returning part of the wastewater in the water outlet area 23 to the water inlet area 2; the coagulation air flotation tank 3 comprises a coagulation area 31, a flocculation area 32 and a sedimentation area 33 which are arranged in sequence; a lifting pump for pumping the supernatant after precipitation into the biological tank reactor 4 is arranged in the precipitation zone 33; biological fillers are added into the biological tank reactor 4, the biological fillers are basalt fibers, and the monofilament diameter of the basalt fibers is 8 microns; the biological tank reactor 4 is also provided with an aeration device, a dissolved oxygen detector and a partition plate, wherein the partition plate is used for separating the basalt fiber from the aeration device and preventing gas from directly scouring the basalt fiber so as to destroy the basalt fiber structure; the secondary sedimentation tank 5 is communicated with the biological tank reactor 4.

s1, firstly, adjusting the pH value of the wastewater to be treated to 4.5 in the adjusting tank 1; the wastewater to be treated is wastewater of a certain chemical industry park in Jiaxing city of Zhejiang province, and the wastewater contains characteristic pollutants such as epoxy, dichlorophenol, nitrophenol and the like;

s2, pumping the regulated wastewater into the water inlet area 21 through the lift pump, sequentially immersing the water inlet area 21 and the filler area 22 (immersing the iron-copper-based reducing filler) from bottom to top to enter the water outlet area 23 along with the increase of the pumped wastewater, and refluxing a part of wastewater into the water inlet area 21 through the reflux port and the reflux pipe, wherein the reflux ratio is 3.0; the hydraulic retention time of the wastewater in the reduction tower 2 is 2.5 hours; monitoring by the ORP monitoring instrument, stopping water inflow when ORP normal state is higher than-50 mv, performing back washing treatment on the reduction tower 2 through the back washing pipe, and then discharging back washing water from the back washing water outlet; the B/C of the original wastewater treated by the step S2 is promoted to 0.35 from 0.064;

s3, when the pH value of the wastewater in the water outlet zone 23 is 8.0, the wastewater enters the coagulation and floatation tank 3 through the water outlet, and sequentially passes through the coagulation zone 31, the flocculation zone 32 and the sedimentation zone 33; suspended matters in the wastewater are removed in the settling zone 33, then supernatant generated after settling is pumped into the biological tank reactor 4 through the lift pump, and the DO value is monitored through the dissolved oxygen detector; the DO value is stabilized at 2.0 by the adjustment of the aeration device arranged in the biological tank reactor 4;

The above-mentioned preferred embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention. Obvious variations or modifications of the present invention are within the scope of the present invention.

Claims

1. A nano-tube wastewater treatment system in a chemical industrial park is characterized by comprising an adjusting tank (1), a reduction tower (2), a coagulation air flotation tank (3), a biological tank reactor (4) and a secondary sedimentation tank (5); a lifting pump for pumping wastewater into the reduction tower (2) is arranged in the regulating tank (1); the interior of the reduction tower (2) is divided into a water inlet area (21), a filler area (22) and a water outlet area (23) which are communicated with each other from bottom to top; a return pipe and a back flushing pipe are arranged in the water inlet area (21); the filler area (22) is filled with iron-copper-based reducing filler; a water outlet, a reflux port and a back flush water outlet are arranged in the water outlet area (23); an ORP monitor is also arranged in the water outlet zone (23); the return pipe is connected with the return port and is used for returning part of the wastewater in the water outlet area (23) to the water inlet area (21); the coagulation air flotation tank (3) comprises a coagulation area (31), a flocculation area (32) and a sedimentation area (33) which are arranged in sequence; a lifting pump for pumping the supernatant after precipitation into the biological tank reactor (4) is arranged in the precipitation zone (33); biological fillers are added into the biological tank reactor (4); an aeration device and a dissolved oxygen detector are also arranged in the biological tank reactor (4); the secondary sedimentation tank (5) is communicated with the biological tank reactor (4).

2. The chemical industrial park nanotube wastewater treatment system of claim 1, wherein the iron-copper based reduction filler has a porosity of 45-55%.

3. The chemical industry park nano-tube wastewater treatment system according to claim 1, characterized in that an aeration device is also arranged in the water inlet area (21).

4. The chemical industry park nanotube wastewater treatment system according to claim 1, wherein the biological tank reactor (4) is further provided with a partition plate for separating the biological filler from the aeration device.

5. The chemical industry park nanotube wastewater treatment system of claim 1, wherein the biological filler is basalt fiber, and the monofilament diameter of the basalt fiber is 5-10 μm.

6. A process for treating wastewater containing nanotubes in a chemical industry park, which is characterized in that the treatment system of any one of claims 1 to 5 is adopted for wastewater treatment, and the process comprises the following steps:

s1, adjusting the wastewater to be treated to be acidic in the adjusting tank (1);

s2, pumping the regulated wastewater into the water inlet area (21) through the lift pump, and as the pumped wastewater increases, sequentially immersing the water inlet area (21) and the filler area (22) from bottom to top into the water outlet area (23), and returning part of the wastewater to the water inlet area (21) through the return port and the return pipe; monitoring the water inflow through the ORP monitor, and performing back washing treatment on the reduction tower (2);

s3, the wastewater in the water outlet area (23) enters the coagulation and floatation tank (3) through the water outlet, and sequentially passes through the coagulation area (31), the flocculation area (32) and the sedimentation area (33); suspended matters in the wastewater are removed in the sedimentation zone (33), then supernatant generated after sedimentation is pumped into the biological tank reactor (4) through a lift pump, and DO value is monitored through the dissolved oxygen detector;

s4, carrying out biochemical treatment on the wastewater in the biological tank reactor (4) to realize COD degradation and total nitrogen removal, and finally entering the secondary sedimentation tank (5) to finish the treatment of the nano-tube wastewater.

7. The chemical industry park nanotube wastewater treatment process according to claim 6, wherein step S1 is to adjust the pH of wastewater to be treated to 3.0-5.0 in the adjusting tank (1).

8. The chemical industry park nanotube wastewater treatment process according to claim 6, wherein step S2, the regulated wastewater is pumped into the water inlet zone (21) through the lift pump, the water inlet zone (21) and the filler zone (22) are immersed into the water outlet zone (23) from bottom to top in sequence as the pumped wastewater increases, and part of the wastewater flows back to the water inlet zone (21) through the return port and the return pipe, and the reflux ratio is 1.0-3.0; the hydraulic retention time of the wastewater in the reduction tower (2) is 0.5 to 3 hours; and monitoring by the ORP monitoring instrument, stopping water inflow when ORP normal state is higher than-50 mv, performing back washing treatment on the reduction tower (2) through the back washing pipe, and then discharging back washing water from the back washing water outlet.

9. The chemical industry park nanotube wastewater treatment process according to claim 6, wherein in the step S3, the wastewater in the effluent zone (23) enters the coagulation and floatation tank (3) through the water discharge port when the pH is 8.0-9.0, and sequentially passes through the coagulation zone (31), the flocculation zone (32) and the sedimentation zone (33); suspended matters in the wastewater are removed in the sedimentation zone (33), then supernatant liquid generated after sedimentation is pumped into the biological tank reactor (4) through the lift pump, and DO value is monitored through the dissolved oxygen detector; the DO value is stabilized at 1.5-2.0 by the aeration device arranged in the biological tank reactor (4).