Biochemical treatment system for high-concentration chemical wastewater

Abstract

The utility model relates to the field of chemical production, and provides a biochemical treatment system for high-concentration chemical wastewater. Comprising a biochemical reaction tank, the bottom of the biochemical reaction tank is connected with a heat exchange circulating pump and an output pump through pipelines, the heat exchange circulating pump is connected with a heat exchange channel of a heat exchanger through a pipeline, a heat exchange medium channel of the heat exchanger is connected with a condensate water circulating pipeline and a steam circulating pipeline, and the output end of the output pump is connected with an ultrafiltration membrane filter. The output end of the ultrafiltration membrane filter is connected with a circulating pump, and the output end of the circulating pump is connected with a filter assembly through a pipeline. Wastewater is treated in a biochemical treatment mode, sewage subjected to biochemical treatment is filtered through cooperation of the ultrafiltration membrane filter and the rotary brush type filters which are arranged in a two-stage series connection mode, the filtering effect is good, and wastewater which does not meet the discharge requirement continues to be circularly treated through arrangement of multiple sampling branches. Finally, qualified wastewater clear liquid is discharged after being adsorbed by activated carbon, and it is ensured that the treated wastewater meets the discharge standard.

Description

Technical Field

[0001] The utility model relates to the field of chemical production, in particular to a high-concentration chemical wastewater biochemical treatment system. Background Art

[0002] Wastewater from chemical production processes usually contains high concentrations of mixed liquid suspended solids, including active microorganisms, microbial oxidation residues, organic matter and inorganic matter, etc. Direct discharge of wastewater will have a serious impact on the water source and other environments. Only clear liquid that has been effectively treated can meet the discharge standards.

[0003] For high-concentration chemical wastewater, the common treatment method is biochemical treatment. Through the addition of reagents and aeration, the suspended solids in the mixed liquid of the wastewater after neutralization and other pretreatments undergo biochemical reactions, and then the particles and macromolecular substances are filtered out through multiple filtrations to obtain clear liquid. The filtration effect during the wastewater treatment process and the detection of the clear liquid after filtration are important factors to ensure the effect and efficiency of wastewater treatment. Summary of the invention

[0004] In order to ensure that high-concentration chemical wastewater can be effectively treated and meet discharge standards, the utility model aims to provide a high-concentration chemical wastewater biochemical treatment system.

[0005] The technical solution adopted by the utility model is:

[0006] A biochemical treatment system for high-concentration chemical wastewater, comprising a biochemical reaction tank, the biochemical reaction tank is a closed tank body, the top of the tank body is provided with a wastewater pipe, a dosing pipe and an exhaust pipe, the wastewater pipe is connected to the wastewater input, the dosing pipe is connected to the dosing device, the exhaust pipe is connected to the exhaust gas treatment system, an aeration device is installed in the biochemical reaction tank, the bottom of the biochemical reaction tank is respectively connected to a jet pump, a heat exchange circulation pump and an output pump through pipelines, the output end of the sputtering pump is connected to the injection device in the biochemical reaction tank through a pipeline, the heat exchange circulation pump is connected to the heat exchange channel of the heat exchanger through a pipeline, the heat exchange medium channel of the heat exchanger is connected to the condensed water circulation pipeline and the steam circulation pipeline; the output end of the heat exchange channel of the heat exchanger is connected to the heat exchange medium channel of the heat exchanger through a pipeline. A pipeline is connected to the upper interface of the biochemical reaction tank; an air input pipeline is arranged on the upper part of the biochemical reaction tank, one section of the air input pipeline is connected to a blower, and the other section of the air input pipeline is connected to the aeration device; the output end of the output pump is connected to an ultrafiltration membrane filter through a pipeline, the output end of the ultrafiltration membrane filter is connected to a circulation pump through a pipeline, the output end of the circulation pump is connected to a filter assembly through a pipeline, the output end of the filter assembly is provided with branches respectively connected to a water outlet tank, an input end of the circulation pump and the upper part of the biochemical reaction tank, and each branch is respectively installed with a control valve; a water outlet pump is installed at the bottom of the water outlet tank, and the output end of the water outlet pump is provided with a branch connected to an activated carbon filter and the upper part of the biochemical reaction tank.

[0007] Furthermore, the filter assembly includes two rotating brush filters arranged in series, the output end of the circulation pump is connected to the inner cavity of the rotating brush filter, the inner cavity of the two-stage rotating brush filter is connected to the water outlet of the outer cavity of each rotating brush filter through a pipe, and the end of the inner cavity of the second-stage rotating brush filter is connected to the input end of the circulation pump and the biochemical reaction tank through a branch pipe with a control valve.

[0008] Furthermore, the filter assembly is connected to a flushing device, which includes a flushing water tank and a flushing pump. The flushing pump is connected to the flushing water tank, and the output end of the flushing pump is connected to the input end of a circulation pump through a pipeline. The end of the inner cavity of the second-stage rotating brush filter of the filter assembly is connected to the branch line connected to the biochemical reaction tank through a pipeline to form a flushing cycle.

[0009] Furthermore, sampling valves are installed at the output end of the output pump, the output end of the filter assembly and the output end of the water outlet pump respectively, and the sampling valves are connected to sampling branches.

[0010] Furthermore, the dosing device includes a dosing box and a dosing pump, and the dosing pump is connected to the bottom of the dosing box and the dosing pipeline.

[0011] Furthermore, it comprises two blowers arranged in parallel, and a filter is installed on the pipeline connecting the blower and the biochemical reaction tank.

[0012] Furthermore, an overflow pipe is provided at the top of the biochemical reaction tank, and a discharge pipe is provided at the bottom of the biochemical reaction tank, and the overflow pipe and the discharge pipe are connected to the sewage pool.

[0013] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: the wastewater is treated by biochemical treatment, and the changes in ambient temperature are taken into account during the treatment process to ensure the optimal treatment temperature of bacteria. A heat exchange cycle is installed on the outside of the biochemical treatment tank. When the external temperature is high, cooling water can be introduced for cooling, and when the external temperature is low, steam can be introduced for heating to ensure the effect of biochemical treatment; the sewage after biochemical treatment is filtered and treated by an ultrafiltration membrane filter in combination with a two-stage rotating brush filter arranged in series, with good filtering effect, and by setting up multiple sampling branches, the wastewater that does not meet the discharge requirements continues to be circulated for treatment, and finally the qualified wastewater clear liquid is discharged after being adsorbed by activated carbon to ensure that the treated wastewater meets the discharge standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a system schematic diagram of the utility model.

[0015] In the figure: biochemical reaction tank 1, dosing device 2, dosing box 21, dosing pump 22, blower 3, heat exchanger 4, condensate circulation pipeline 41, steam circulation pipeline 42, ultrafiltration membrane filter 5, filter assembly 6, inner cavity 61, outer cavity 62, flushing device 7, flushing water tank 71, flushing pump 72, water outlet tank 8, aeration device 9, jet pump 10, heat exchange circulation pump 11, output pump 12, circulation pump 13, sampling valve 14, water outlet pump 15, activated carbon filter 16. DETAILED DESCRIPTION

[0016] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:

[0017] like Figure 1 As shown, a high-concentration chemical wastewater biochemical treatment system consists of a biochemical reaction tank 1, a dosing device 2, a blower 3, a heat exchanger 4, an ultrafiltration membrane filter 5, a filter assembly 6, a flushing device 7, a water outlet box 8 and related pipes, pumps, valves and other components, and is used for the biochemical treatment of chemical wastewater.

[0018] The biochemical reaction tank 1 is a closed tank body. The top of the tank body 1 is provided with a wastewater pipe, a dosing pipe and an exhaust pipe. The wastewater pipe is connected to the wastewater input and is used to send the wastewater after pretreatment such as neutralization into the biochemical reaction tank. The dosing pipe is connected to a dosing device 2, and the dosing device 2 includes a dosing box 21 and a dosing pump 22. The dosing pump 22 sends the agent in the dosing box 21 from the dosing pipe into the biochemical reaction tank 1. The exhaust pipe is used to maintain the air pressure balance in the biochemical reaction tank. The exhaust pipe is connected to the waste gas treatment system to send the gas generated inside to the waste gas treatment system for treatment. An overflow pipe is provided at the top of the biochemical reaction tank 1 for discharge when there is excessive wastewater. A discharge pipe is provided at the bottom of the biochemical reaction tank 1 for internal flushing after the treatment is completed. The overflow pipe and the discharge pipe are connected to the sewage pool.

[0019] An aeration device 9 is installed in the biochemical reaction tank 1. The aeration device 9 is connected to the air interface on the upper part of the biochemical reaction tank 1 through an air input pipeline. The air interface is connected to two blowers 3 arranged in parallel. The air blown in by the blowers 3 realizes internal aeration and provides oxygen for the biochemical reaction. A filter is installed at the air outlet of each blower. The bottom of the biochemical reaction tank 1 is connected to a jet pump 10 through a pipeline. The jet pump 10 extracts wastewater from the biochemical reaction tank 1 and circulates and sprays it into the biochemical reaction tank 1 to achieve the purpose of accelerating the reaction.

[0020] The heat exchanger 4 is connected to the outside of the biochemical reaction tank 1 through a pipeline and a heat exchange circulation pump 11, and the heat exchange medium channel of the heat exchanger 4 is connected to a condensed water circulation pipeline 41 and a steam circulation pipeline 42; the heat exchange circulation pump 11 extracts wastewater from the inside of the biochemical reaction tank 1 and sends it to the heat exchanger 4 for heat exchange, and the wastewater after heat exchange returns to the biochemical reaction tank 1. When the external temperature is high, circulating cooling water is passed into the heat exchange medium channel of the heat exchanger 4 through the control of the valve, and when the external temperature is low, circulating steam is passed into the heat exchange medium channel of the heat exchanger 4 through the control of the valve. Heat exchange can ensure that the biochemical reaction temperature in the biochemical reaction tank 1 is maintained at different ambient temperatures.

[0021] An output pump 12 is installed at the bottom of the biochemical reaction tank 1. The output pump 12 sends the wastewater after the biochemical reaction to the ultrafiltration membrane filter 5 for filtration. The macromolecular substances and impurities therein are filtered through the ultrafiltration membrane. The filtered wastewater is sent to the filter assembly 6 through the circulation pump 13 for further filtration.

[0022] The filter assembly 6 is composed of two rotating brush filters arranged in series. The circulating pump sends wastewater into the inner cavity 61 of the first-stage rotating brush filter. Impurities in the wastewater flow into the inner cavity of the second-stage rotating brush filter along with the wastewater. The clear liquid flows from the inner cavity 61 of the two-stage rotating brush filter into the outer cavity 62 and enters the outlet tank 8 through the pipeline from the outlet of each outer cavity 62 for collection. The end of the inner cavity of the second-stage rotating brush filter is sent to the input end of the circulating pump 13 or the biochemical reaction tank 1 through a branch pipeline equipped with a control valve for continued circulation treatment, or directly sent to the sewage pool for collection. Sampling valves 14 are installed at the output end of the output pump 12 and the output end of the filter assembly 6, respectively. The sampling valve 14 is connected to a sampling branch. The discharge path of the sewage in the inner cavity of the second-stage rotating brush filter is determined by the sampling analysis results of the sampling branch. The water outlet box 8 is connected to a water outlet pump 15, and a sampling branch is also installed at the output end of the water outlet pump 15. According to the analysis result of the sampling branch, the water outlet pump outputs to the activated carbon filter 16, and is discharged after filtration, or outputs to the biochemical reaction tank 1 to continue the processing cycle.

[0023] In order to avoid clogging, the filter assembly is connected to a flushing device 7, which determines whether flushing is needed by monitoring the pressure on the output pipe of the filter assembly. The flushing device 7 is composed of a flushing water tank 71, a flushing pump 72, and related pipes and valves. The flushing pump 72 draws flushing water from the flushing water tank 71 and sends it to the input end of the circulation pump 13 through a pipe. The flushing water is sent to the filter assembly 6 for flushing through the circulation pump 13. Part of the flushed water returns to the flushing water tank 71 through the pipe from the water outlet of the outer cavity of the filter assembly 6, and part of the water enters the flushing water tank 71 from the end of the inner cavity of the filter assembly 6 through its branch pipe, forming a flushing cycle. An overflow pipe is installed on the top of the flushing water tank 71, and a discharge pipe is installed at the bottom. The overflow and discharge pipes are connected to the sewage pool by pipes.

Claims

1. A biochemical treatment system for high-concentration chemical wastewater, comprising a biochemical reaction tank, wherein the biochemical reaction tank is a closed tank body, a wastewater pipe, a dosing pipe and an exhaust pipe are arranged on the top of the tank body, the wastewater pipe is connected to the wastewater input, the dosing pipe is connected to the dosing device, and the exhaust pipe is connected to the exhaust gas treatment system, characterized in that: An aeration device is installed in the biochemical reaction tank. The bottom of the biochemical reaction tank is connected to a jet pump, a heat exchange circulation pump and an output pump through pipelines. The output end of the jet pump is connected to the injection device in the biochemical reaction tank through a pipeline. The heat exchange circulation pump is connected to the heat exchange channel of the heat exchanger through a pipeline. The heat exchange medium channel of the heat exchanger is connected to a condensed water circulation pipeline and a steam circulation pipeline. The output end of the heat exchange channel of the heat exchanger is connected to the upper interface of the biochemical reaction tank through a pipeline. The upper part of the biochemical reaction tank is provided with an air input pipeline, and a section of the air input pipeline is connected to a blast pump. The other section of the air input pipeline is connected to the aeration device; the output end of the output pump is connected to the ultrafiltration membrane filter through a pipeline, the output end of the ultrafiltration membrane filter is connected to the circulation pump through a pipeline, the output end of the circulation pump is connected to the filter assembly through a pipeline, the output end of the filter assembly is provided with branches respectively connected to the water outlet tank, the circulation pump input end and the upper part of the biochemical reaction tank, and each branch is respectively installed with a control valve; the bottom of the water outlet tank is installed with a water outlet pump, and the output end of the water outlet pump is provided with a branch connected to the activated carbon filter and the upper part of the biochemical reaction tank.

2. A high-concentration chemical wastewater biochemical treatment system according to claim 1, characterized in that: The filter assembly includes two rotating brush filters arranged in series, the output end of the circulation pump is connected to the inner cavity of the rotating brush filter, the inner cavities of the two-stage rotating brush filters are connected to the water outlet tank through a pipeline, and the end of the inner cavity of the second-stage rotating brush filter is connected to the input end of the circulation pump and the biochemical reaction tank through a branch pipeline with a control valve.

3. A high-concentration chemical wastewater biochemical treatment system according to claim 2, characterized in that: The filter assembly is connected to a flushing device, which includes a flushing water tank and a flushing pump. The flushing pump is connected to the flushing water tank, and the output end of the flushing pump is connected to the input end of the circulation pump through a pipeline. The end of the inner cavity of the second-stage rotating brush filter of the filter assembly is connected to the branch road connected to the biochemical reaction tank through a pipeline to form a flushing cycle.

4. A high-concentration chemical wastewater biochemical treatment system according to claim 1, characterized in that: The output end of the output pump, the output end of the filter assembly and the output end of the water outlet pump are respectively equipped with sampling valves, and the sampling valves are connected to sampling branches.

5. A high-concentration chemical wastewater biochemical treatment system according to claim 1, characterized in that: The dosing device comprises a dosing box and a dosing pump, and the dosing pump is connected to the bottom of the dosing box and between the dosing pipeline.

6. A high-concentration chemical wastewater biochemical treatment system according to claim 1, characterized in that: The invention comprises two blowers arranged in parallel, and a filter is installed on the pipeline connecting the blower and the biochemical reaction tank.

7. A high-concentration chemical wastewater biochemical treatment system according to claim 1, characterized in that: An overflow pipe is arranged on the top of the biochemical reaction tank, and a discharge pipe is arranged on the bottom of the biochemical reaction tank. The overflow pipe and the discharge pipe are connected to the sewage pool.

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