CN210620501U - Chemical fiber factory sewage treatment system - Google Patents
Chemical fiber factory sewage treatment system Download PDFInfo
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- CN210620501U CN210620501U CN201920574730.0U CN201920574730U CN210620501U CN 210620501 U CN210620501 U CN 210620501U CN 201920574730 U CN201920574730 U CN 201920574730U CN 210620501 U CN210620501 U CN 210620501U
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Abstract
The utility model belongs to the field of sewage treatment of chemical fiber plants, in particular to a sewage treatment system of a chemical fiber plant, spandex, chinlon and domestic sewage are gathered to a sewage treatment station, waste silk, waste blocks and other impurities are removed by a grid and then automatically flow into a water collecting well 1, and then the waste water is lifted by a pump to enter a cooling tower for cooling and enter an adjusting and hydrolysis acidification pool; the concentration of suspended solids contained in the filter screen water of the polymerization cleaning filter is higher, the suspended solids are pretreated by an air floatation device and then enter an adjusting and hydrolyzing acidification tank; the polyamide polymerization drainage contains a strand of TAD water, the TAD water passes through the water collecting well 2 and the pH adjusting tank and then is pumped into the micro-electrolysis reactor for pretreatment, then flows into the Fenton reactor, and the effluent enters the adjusting and hydrolysis acidification tank; after hydrolytic acidification treatment, the wastewater is lifted to a UASB reaction tank by a pump, and the effluent enters an anaerobic sedimentation tank. The utility model discloses can carry out effective treatment to chemical fiber factory sewage, sewage obtains national emission standard.
Description
Technical Field
The invention belongs to the field of chemical fiber plant sewage treatment, and particularly relates to a chemical fiber plant sewage treatment system.
Background
Sewage, generally refers to effluent water from life and production that is contaminated to some extent. The sewage mainly comprises domestic sewage, industrial wastewater and initial rainwater. The main pollutants of the sewage include pathogen pollutants, oxygen-consuming pollutants, plant nutrients, toxic pollutants and the like. At present, sewage produced by chemical fiber generally comprises spandex, chinlon water, polymerization cleaning filter screen water, TAD water, domestic sewage and the like, and spandex wastewater has the characteristics of high water temperature, large organic matter concentration fluctuation, higher ammonia nitrogen and COD concentration, low total phosphorus concentration and the like; the polyamide wastewater is mainly derived from extraction wastewater of polymerization slices, the main pollutant in the wastewater is caprolactam, and the caprolactam is easy to decompose and can be degraded into CO in an aerobic environment2、H2O and NH3Resulting in an increase in the total nitrogen content of the system, thereby increasing the difficulty of wastewater treatment. The industrial waste water of the amine fiber contains a large amount of organic matters and has complex components. The waste water from nylon production belongs to biochemical organic waste water with high nitrogen content and high concentration. The polyamide polymerization drainage contains a strand of TAD (tetramethylpiperidine amine) water, and the TAD tetramethylpiperidine amine is a hindered amine stabilizer. The existing treatment system is not thorough in treatment, can cause certain influence on water resources, and is inconvenient to treat, so that the chemical fiber production sewage treatment system is very necessary to solve the problem.
Disclosure of Invention
In order to solve the problems, the invention provides a sewage treatment system for a chemical fiber plant, which can effectively treat sewage.
The specific technical scheme is as follows:
a sewage treatment system of a chemical fiber plant, spandex, chinlon and domestic sewage are converged and connected with a water collecting well 1, the water collecting well 1 is connected with a cooling tower through a pump, and the cooling tower is connected with an adjusting and hydrolyzing acidification tank; a filter screen water pipe of the polymerization cleaning filter is connected with a filter screen water circulation tank, the filter screen water circulation tank is connected with an air floating device, and the air floating device is connected with a regulating and hydrolysis acidification tank through a pipeline; the TAD water pipe is connected with the water collecting well 2, the water collecting well 2 is connected with a PH adjusting tank through a pump, the PH adjusting tank is connected with the micro-electrolysis reactor through a pipeline, and the micro-electrolysis reactor is connected with the adjusting and hydrolysis acidification tank through a pipeline; the adjusting and hydrolyzing acidification tank is connected with the UASB reaction tank through a pump, sludge in the UASB reaction tank enters a sludge concentration tank, effluent enters an anaerobic sedimentation tank, a middle-layer sludge pipe of the anaerobic sedimentation tank is connected with the adjusting and hydrolyzing acidification tank and the UASB reaction tank, a residual sludge pipe of the anaerobic sedimentation tank is connected with the sludge concentration tank, and an upper clear liquid pipe of the anaerobic sedimentation tank is connected with a denitrification tank; the combined biological denitrification tank is divided into 4 grids which are respectively a denitrification tank, a nitrification tank A, a nitrification tank B and a denitrification tank C in sequence, elastic fillers are arranged in the denitrification tanks, and NO2 & lt- & gt, NO3 & lt- & gt in the backflow wastewater are converted into N2 under the action of denitrifying bacteria inhabiting the fillers in the denitrification tanks, so that the requirement of biological denitrification is met; the denitrification tank C is connected with the sedimentation tank, the sedimentation tank is connected with the nitrification tank A and the nitrification tank B through a pump, and a residual sludge pipeline of the sedimentation tank is connected with a sludge concentration tank; the upper clear liquid pipe of the sludge concentration tank is connected with the adjusting and hydrolyzing acidification tank, the sludge concentration tank is also connected with the box-type filter press through a pump, and the filtrate pipe of the box-type filter press is connected with the adjusting and hydrolyzing acidification tank; a part of clear liquid pipe close to the sludge in the sedimentation tank is connected with the denitrification tank, and a supernatant liquid pipe in the sedimentation tank is connected with the discharge tank; and a grid is arranged on the water collecting well 1 and the water collecting well 2.
Spandex, chinlon and domestic sewage are converged to a sewage treatment station, waste silk, waste blocks and other impurities are removed through a grating and then automatically flow into a water collecting well 1 (temporary storage function), then the wastewater is lifted by a pump, enters a cooling tower and is cooled to 37-39 ℃ (the wastewater does not need to enter the cooling tower when the temperature is not high), enters an adjusting and hydrolyzing acidification tank, a submersible stirrer is arranged in the adjusting and hydrolyzing acidification tank, sludge is maintained in a suspension state, and elastic filler is hung on the sludge.
The concentration of Suspended Solids (SS) contained in the filter screen water of the polymerization cleaning filter is higher, and the Suspended Solids (SS) need to be pretreated by an air floatation device and then enter an adjusting and hydrolyzing acidification tank.
The polyamide polymerization wastewater contains a strand of TAD (tetramethylpiperidine amine) water, TAD is a hindered amine stabilizer, the TAD water is pumped into a micro-electrolysis reactor for pretreatment after passing through a water collecting well 2 (under the action of temporary storage), then flows into a Fenton reactor, hydrogen peroxide is added into the Fenton reactor, a Fenton reagent is formed by the TAD water and ferrous ions dissolved in the wastewater to oxidize organic matters in the wastewater, and the effluent enters an adjusting and hydrolyzing acidification tank.
The spandex and chinlon water, the domestic sewage, the TAD water and the polymerization cleaning filter screen water are subjected to hydrolytic acidification treatment and then lifted to a UASB reaction tank (UASB reactor) through a pump, most organic pollutants are removed, effluent water enters an anaerobic sedimentation tank, mud and water are separated, part of sludge is pumped into the UASB reaction tank for continuous use, and supernatant of the anaerobic sedimentation tank automatically flows into a denitrification tank of the combined biological denitrification tank. The combined biological denitrification tank is divided into 4 grids, namely a denitrification tank, a nitrification tank A, a nitrification tank B and a denitrification tank C, and elastic fillers are arranged in the tanks. The NO in the backflow wastewater can be caused to flow back through the action of denitrifying bacteria inhabiting the filler in the denitrifying tank2 -、NO3 -Conversion to N2Thereby meeting the requirement of biological denitrification. Because the preposed denitrification process is adopted, the denitrifying bacteria in the denitrification tank can use organic matters in the inlet water as carbon sources, and only a small amount of carbon sources are added to meet the requirement of wastewater treatment.
The process flow of the combined biological denitrification tank is 'denitrification tank → nitrification tank A → nitrification tank B → denitrification tank C', the nitrification tank divides the sludge load into 2 sections with high load and common load to operate in series, and the design requirements of decarburization and nitrification can be combined. A. The aeration tank B not only improves the purification efficiency of the system, but also prevents the sludge from expanding and reduces the residual sludge amount, and even realizes the zero emission of the sludge in the operation process of the engineering system.
And finally, adding flocculating agents (PAC and PAM) into the effluent of the denitrification tank C at the last stage, fully and uniformly mixing the effluent through a pipeline mixer, enabling the effluent to enter a sedimentation tank to realize sludge-water separation, enabling one part of sludge to flow back to A, B2 nitrification sections of the A, B, C tank, enabling the other part of residual sludge to enter a sludge concentration tank, and carrying out filter pressing on the sludge through a box filter press, and then transporting a sludge cake outwards.
And the supernatant of the sludge concentration tank and the pressure filtrate of the box type filter press enter the adjusting and hydrolysis acidification tank. Part of clear liquid close to the sludge in the sedimentation tank flows back to the denitrification tank of the first-stage A/O process, and the rest of effluent part reaches the standard and is discharged.
Has the advantages that:
sewage produced by chemical fiber generally comprises spandex, chinlon water, polymerization cleaning filter screen water, TAD water, domestic sewage and the like, and the spandex wastewater has the characteristics of high water temperature, large organic matter concentration fluctuation, higher ammonia nitrogen and COD concentration, low total phosphorus concentration and the like; the polyamide wastewater is mainly derived from extraction wastewater of polymerization slices, the main pollutant in the wastewater is caprolactam, and the caprolactam is easy to decompose and can be degraded into CO in an aerobic environment2、H2O and NH3Resulting in an increase in the total nitrogen content of the system, thereby increasing the difficulty of wastewater treatment. The industrial waste water of the amine fiber contains a large amount of organic matters and has complex components. The waste water from nylon production belongs to biochemical organic waste water with high nitrogen content and high concentration. The polyamide polymerization drainage contains a strand of TAD (tetramethylpiperidine amine) water, and the TAD tetramethylpiperidine amine is a hindered amine stabilizer.
The technology provided by the invention can effectively treat sewage of a chemical fiber plant, particularly spandex, chinlon water, polymerization cleaning filter screen water, TAD water, domestic sewage and the like, and can effectively treat a large amount of organic matter concentration, ammonia nitrogen and COD in spandex wastewater; and solves the problems that the caprolactam in the chinlon wastewater is easy to decompose, and the total nitrogen content in the system is increased. And TAD (tetramethylpiperidine amine) water in polyamide polymerization wastewater can be effectively treated, and sewage can obtain the national discharge standard.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
A sewage treatment system of a chemical fiber plant, spandex, chinlon and domestic sewage are converged and connected with a water collecting well 1, the water collecting well 1 is connected with a cooling tower through a pump, and the cooling tower is connected with an adjusting and hydrolyzing acidification tank; a filter screen water pipe of the polymerization cleaning filter is connected with a filter screen water circulation tank, the filter screen water circulation tank is connected with an air floating device, and the air floating device is connected with a regulating and hydrolysis acidification tank through a pipeline; the TAD water pipe is connected with the water collecting well 2, the water collecting well 2 is connected with a PH adjusting tank through a pump, the PH adjusting tank is connected with the micro-electrolysis reactor through a pipeline, and the micro-electrolysis reactor is connected with the adjusting and hydrolysis acidification tank through a pipeline; the adjusting and hydrolyzing acidification tank is connected with the UASB reaction tank through a pump, sludge in the UASB reaction tank enters a sludge concentration tank, effluent enters an anaerobic sedimentation tank, a middle-layer sludge pipe of the anaerobic sedimentation tank is connected with the adjusting and hydrolyzing acidification tank and the UASB reaction tank, a residual sludge pipe of the anaerobic sedimentation tank is connected with the sludge concentration tank, and an upper clear liquid pipe of the anaerobic sedimentation tank is connected with a denitrification tank; the combined biological denitrification tank is divided into 4 grids which are respectively a denitrification tank, a nitrification tank A, a nitrification tank B and a denitrification tank C in sequence, elastic fillers are arranged in the denitrification tanks, and NO2 & lt- & gt, NO3 & lt- & gt in the backflow wastewater are converted into N2 under the action of denitrifying bacteria inhabiting the fillers in the denitrification tanks, so that the requirement of biological denitrification is met; the denitrification tank C is connected with the sedimentation tank, the sedimentation tank is connected with the nitrification tank A and the nitrification tank B through a pump, and a residual sludge pipeline of the sedimentation tank is connected with a sludge concentration tank; the upper clear liquid pipe of the sludge concentration tank is connected with the adjusting and hydrolyzing acidification tank, the sludge concentration tank is also connected with the box-type filter press through a pump, and the filtrate pipe of the box-type filter press is connected with the adjusting and hydrolyzing acidification tank; a part of clear liquid pipe close to the sludge in the sedimentation tank is connected with the denitrification tank, and a supernatant liquid pipe in the sedimentation tank is connected with the discharge tank; and a grid is arranged on the water collecting well 1 and the water collecting well 2.
The sewage treatment system of the chemical fiber plant shown in fig. 1 is characterized in that spandex, chinlon and domestic sewage are collected to a sewage treatment station, waste silk, waste blocks and other impurities are removed by a grating, then the wastewater automatically flows into a water collecting well 1, is lifted by a pump, enters a cooling tower, is cooled to 37-39 ℃, and enters an adjusting and hydrolyzing acidification tank; a submersible stirrer is arranged in the adjusting and hydrolyzing acidification tank to maintain the sludge in a suspension state, and an elastic filler is hung in the adjusting and hydrolyzing acidification tank;
the concentration of suspended solids contained in the filter screen water of the polymerization cleaning filter is higher, the suspended solids are pretreated by an air floatation device and then enter an adjusting and hydrolyzing acidification tank;
the method comprises the following steps that (1) TAD water is contained in polyamide polymerization drainage water, the TAD water passes through a water collecting well 2 and a pH adjusting tank and then is pumped into a micro-electrolysis reactor for pretreatment, then flows into a Fenton reactor automatically, hydrogen peroxide is added into the Fenton reactor, a Fenton reagent is formed by the TAD water and ferrous ions dissolved in wastewater to oxidize organic matters in the wastewater, and effluent enters an adjusting and hydrolyzing acidification tank;
the method comprises the following steps of (1) lifting spandex and chinlon water, domestic sewage, TAD (TAD) water and polymerization cleaning filter screen water to a UASB (upflow anaerobic sludge blanket) reaction tank through a pump after hydrolytic acidification treatment, removing most organic pollutants, enabling effluent to enter an anaerobic sedimentation tank, separating mud and water, pumping part of sludge to the UASB reaction tank and a regulating and hydrolytic acidification tank for continuous use, enabling supernatant of the anaerobic sedimentation tank to automatically flow into a denitrification tank of a combined biological denitrification tank, and enabling residual sludge to enter a sludge concentration tank;
the combined biological denitrification tank is divided into 4 grids which are respectively a denitrification tank, a nitrification tank A, a nitrification tank B and a denitrification tank C, elastic fillers are arranged in the denitrification tank, and NO2 & lt- & gt and NO3 & lt- & gt in the backflow wastewater are converted into N2 under the action of denitrifying bacteria inhabiting the fillers in the denitrification tank, so that the requirement of biological denitrification is met;
the combined mode of the combined biological denitrification tank is 'denitrification tank → nitrification tank A → nitrification tank B → denitrification tank C', the nitrification tank A and the nitrification tank B divide the sludge load into 2 sections with high load and common load to be connected in series for operation, and the requirements of decarburization and nitrification can be combined;
adding a flocculating agent into the effluent of the denitrification tank C at the last stage, then fully and uniformly mixing the effluent by a pipeline mixer, and then enabling the effluent to enter a sedimentation tank to realize sludge-water separation, wherein one part of sludge reflows to the nitrification tank A and the nitrification tank B, the other part of residual sludge enters a sludge concentration tank, and sludge is subjected to filter pressing by a box filter press and then is transported outside;
supernatant of the sludge concentration tank and pressure filtrate of the chamber type filter press enter an adjusting and hydrolysis acidification tank, partial supernatant close to sludge in the sedimentation tank reflows to a denitrification tank of the combined biological denitrification tank, partial supernatant in the sedimentation tank enters a discharge tank to be discharged after reaching standards, and residual sludge in the sludge concentration tank is added with a flocculating agent and pumped into the chamber type filter press to be transported outside to be treated. The flocculant is PAC, PAM or a mixture thereof, the PAC is polyaluminium chloride, and the PAC is polyacrylamide.
Examples
1.1 Water quality Condition of raw Water
According to the relevant data provided by the owner, the wastewater contains spandex, chinlon water, polymerization cleaning filter screen water and TAD water, and the water quality parameters of the raw water after finishing are shown in a table 1-1:
the water flow of the filter screen of the polymerization cleaning filter is 150m3The maximum index of solid suspended matter reaches 3500 mg/L. The polyamide polymerization drainage also contains a strand of TAD water with the water amount of 36m3(ii)/d, containing TAD of 95 kg.
1.2 sources of wastewater and water quality and quantity
The wastewater sources of the project mainly comprise spandex water, chinlon water, polymerization cleaning filter screen water, TAD (TAD) water and domestic sewage, and the design wastewater treatment capacity is 1000m3/d。
Wherein the design water quantity of the domestic sewage is calculated by 500 workers and 250L/(d.d.people) of water consumption per day, and the design water quantity is 125m3D; the water quantity of the filter screen water for polymerization cleaning is 150m3D; the water quantity of TAD water in polyamide polymerization drainage is 36m3/d。
1.3 design water quantity and quality of wastewater
According to the relevant data provided by the owner, the water quality parameters of the inlet water designed by the reconstruction project are shown in the table 1-2:
aiming at the water of a filter screen of a polymerization cleaning filter, the index of solid suspended matter is 3500mg/L at most, and the main component of the solid suspended matter is TiO2The modification project considers that air floatation pretreatment is firstly adopted, and then the wastewater is discharged into a regulating and hydrolysis acidification tank to be treated by a biochemical system. The polyamide polymerization drainage contains a strand of TAD water, and according to the measurement result, the specific water quality condition of the waste water is shown in tables 1-3. As is clear from tables 1 to 3, TAD water has a B/C value of only 0.23, is poor in biochemical properties, cannot be directly subjected to biochemical treatment, and requires pretreatment to improve the biochemical properties and subsequent biochemical treatment.
1.4 Water quality parameters after treatment
According to the requirement that the wastewater after treatment needs to reach the secondary discharge standard of Integrated wastewater discharge Standard (GB 8978-1996), specific effluent water quality indexes are shown in tables 1-4:
2.1 description of the Process
Spandex, chinlon and domestic sewage are converged to a sewage treatment station, waste silk, waste blocks and other impurities are removed through a grating and then automatically flow into a water collecting well 1 (temporary storage function), then the wastewater is lifted by a pump, enters a cooling tower and is cooled to 37-39 ℃ (the wastewater does not need to enter the cooling tower when the temperature is not high), enters an adjusting and hydrolyzing acidification tank, a submersible stirrer is arranged in the adjusting and hydrolyzing acidification tank, sludge is maintained in a suspension state, and elastic filler is hung on the sludge.
The concentration of Suspended Solids (SS) contained in the filter screen water of the polymerization cleaning filter is higher, and the Suspended Solids (SS) need to be pretreated by an air floatation device and then enter an adjusting and hydrolyzing acidification tank.
The polyamide polymerization wastewater contains a strand of TAD (tetramethylpiperidine amine) water, TAD is a hindered amine stabilizer, the TAD water is pumped into a micro-electrolysis reactor for pretreatment after passing through a water collecting well 2 (under the action of temporary storage), then flows into a Fenton reactor, hydrogen peroxide is added into the Fenton reactor, a Fenton reagent is formed by the TAD water and ferrous ions dissolved in the wastewater to oxidize organic matters in the wastewater, and the effluent enters an adjusting and hydrolyzing acidification tank.
The spandex and chinlon water, the domestic sewage, the TAD water and the polymerization cleaning filter screen water are subjected to hydrolytic acidification treatment and then lifted to a UASB reaction tank (UASB reactor) through a pump, most organic pollutants are removed, effluent water enters an anaerobic sedimentation tank, mud and water are separated, part of sludge is pumped into the UASB reaction tank for continuous use, and supernatant of the anaerobic sedimentation tank automatically flows into a denitrification tank of the combined biological denitrification tank. The combined biological denitrification tank is divided into 4 grids, namely a denitrification tank, a nitrification tank A, a nitrification tank B and a denitrification tank C, and elastic fillers are arranged in the tanks. The NO in the backflow wastewater can be caused to flow back through the action of denitrifying bacteria inhabiting the filler in the denitrifying tank2 -、NO3 -Conversion to N2Thereby meeting the requirement of biological denitrification. Because the preposed denitrification process is adopted, the denitrifying bacteria in the denitrification tank can use organic matters in the inlet water as carbon sources, and only a small amount of carbon sources are added to meet the requirement of wastewater treatment.
The process flow of the combined biological denitrification tank is 'denitrification tank → nitrification tank A → nitrification tank B → denitrification tank C', the nitrification tank divides the sludge load into 2 sections with high load and common load to operate in series, and the design requirements of decarburization and nitrification can be combined. A. The aeration tank B not only improves the purification efficiency of the system, but also prevents the sludge from expanding and reduces the residual sludge amount, and even realizes the zero emission of the sludge in the operation process of the engineering system.
And finally, adding flocculating agents (PAC and PAM) into the effluent of the denitrification tank C at the last stage, fully and uniformly mixing the effluent through a pipeline mixer, enabling the effluent to enter a sedimentation tank to realize sludge-water separation, enabling one part of sludge to flow back to A, B2 nitrification sections of the A, B, C tank, enabling the other part of residual sludge to enter a sludge concentration tank, and carrying out filter pressing on the sludge through a box filter press, and then transporting a sludge cake outwards.
And the supernatant of the sludge concentration tank and the pressure filtrate of the box type filter press enter the adjusting and hydrolysis acidification tank. Part of clear liquid of the sedimentation tank close to the sludge flows back to the denitrification tank of the combined biological denitrification tank, and the rest of effluent part reaches the standard and is discharged.
3.1TAD Water Process flow
The chinlon drainage contains a strand of TAD water, wherein TAD is a hindered amine stabilizer and is named as tetramethyl piperidylamine in Chinese. The hindered amine light stabilizer is an organic amine compound which takes 2,2,6, 6-tetramethyl-4-piperidyl as a matrix and has steric hindrance effect. The hindered amine light stabilizer has four functions of decomposing hydroperoxide, quenching excited oxygen, capturing free radicals, recycling and the like, and is not only an efficient light stabilizer, but also an efficient antioxidant. The hindered amine functional group belongs to alicyclic amines, which can be converted into corresponding nitroxide radicals under the action of heat, light, oxygen and the like, and the nitroxide radicals are very stable.
The micro-electrolysis method is a good process for treating wastewater by using a metal corrosion principle to form a primary battery, and is also called as an internal electrolysis method. Under the condition of no power supply, the micro-electrolysis material filled in the wastewater generates high and low potential difference to carry out electrolysis treatment on the wastewater so as to achieve the purpose of degrading organic pollutants. Micro-electrolysis itself and the new ecology [ H ], Fe produced by it in neutral or slightly acidic environment2+Etc. have oxidation-reduction reaction with many components in waste water, such as chromophoric group or chromophoric group capable of destroying coloured material in coloured waste water, and even chain scission, and can decolour and reduce CODCrThe biodegradability is improved, the significance for improving the subsequent biochemical treatment capability is profound, and the method is particularly suitable for the treatment of organic wastewater difficult to degrade.
Hydrogen peroxide (H)2O2) With ferrous iron ion Fe2 +The mixed solution of (2) has strong oxidizing property, and can oxidize a plurality of known organic compounds such as carboxylic acid, alcohol and ester into inorganic state. The Fenton reagent reaction system is complex, and the key is H2O2In Fe2+The oxidation capability of the OH generated under catalysis is second to that of fluorine and reaches 2.80V. In addition, OH has high electronegativity or electrophilicity, the electron affinity is up to 569.3kJ, and the addition reaction characteristic is strong. Therefore, the Fenton reagent can oxidize most organic matters in water and is suitable for treating wastewater which is difficult to biodegrade and is difficult to treat by a general physical and chemical method. After the wastewater is treated by the micro-electrolysis-Fenton series process, the biodegradability of the wastewater is greatly improved.
The B/C value of TAD water in the polyamide wastewater is only 0.23, the biodegradability is poor, the pH value is high (9.95), and the TAD water needs to be pretreated to improve the biodegradability. The TAD water treatment process flow comprises the following steps: TAD water → pH adjusting tank → micro-electrolysis reactor → Fenton reactor → adjusting hydrolysis acidification tank. TAD water firstly enters a water collecting well 2, is lifted to a pH adjusting tank through a lifting pump, and is added with H in a reaction tank2SO4Adjusting the pH value of the wastewater to acidity, lifting the wastewater to a micro-electrolysis reaction tower through a pump for pretreatment, improving the biodegradability of the wastewater, treating TAD water through micro-electrolysis, then automatically flowing into a Fenton reactor for oxidation treatment, degrading organic matters in the wastewater, discharging the effluent into an adjusting and hydrolyzing acidification tank, and further improving the biodegradability of the TAD water in the adjusting and hydrolyzing acidification tank.
3.2 Process flow for polymerizing and cleaning Filter Screen Water
The index of solid suspended matter in the filter screen water of the polymerization cleaning filter is high, wherein the main component of the solid suspended matter is TiO2Sliced powder, TiO2Can inhibit the activity of ammonifying bacteria, nitrifying bacteria and self-generating azotobacter. Polymerization cleaning filter screen water adopts the air supporting to carry out the preliminary treatment, utilize air compressor to send the air that dissolves in the gas pitcher to be forced to dissolve in aqueous under the pressure effect, form and dissolve air water, send to the air supporting groove in, through the release of releaser, the air that dissolves in aqueous is appeared, form the abundant contact of suspended solid in a large amount of microbubble crowd and the waste water, and adsorb in the suspended solid that the flocculation is good at the in-process that slowly rises, make its density descend and float to the surface of water, reach and get rid of SS and COD and the suspended solid that COD are in the process of getting rid ofCrThe purpose of (1). Setting PAC, PAnd in the AM dosing system, scum is conveyed to a sludge tank by using a conveying pump, and wastewater directly enters the adjusting and hydrolysis acidification tank for treatment.
3.3 Process flow of comprehensive production wastewater (Spandex, Chinlon Water and domestic Sewage)
The polyamide wastewater is mainly derived from extraction wastewater of polymerization slices, main pollutants are caprolactam, benzoic acid, methylbenzene, cyclohexylamide and the like, wherein the caprolactam is extremely easy to decompose and is converted into NH in the biodegradation process3-N. The nylon wastewater has the following characteristics: (1) because the chinlon wastewater is not continuously discharged, the water quality changes along with the change of time; (2) the wastewater is mainly from extraction wastewater of polymerization slices, and is converted into NH in the biodegradation process due to extremely easy decomposition of caprolactam3N, which causes high ammonia nitrogen concentration in the wastewater and becomes one of the difficulties and the key points of wastewater treatment; (3) the wastewater from the production of chinlon-6 belongs to high-concentration organic wastewater and has average CODCrThe concentration is more than 1000mg/L, and the method is characterized in that the ratio of B to C is high (the value of B to C is about 0.875), the ratio of C to N is not regulated, and the method is high-nitrogen organic wastewater which is difficult to treat at present.
The spandex, the chinlon water and the domestic sewage automatically flow to the collecting well 1 and are lifted to the adjusting and hydrolyzing acidification pool by the lifting pump of the collecting well 1, when the temperature is overhigh, the spandex, the chinlon water and the domestic sewage firstly pass through the cooling tower and then automatically flow into the adjusting and hydrolyzing acidification pool, the wastewater overflows into the lifting pump pool and is lifted to a UASB reaction pool (UASB reactor), and most organic matters and COD in the wastewater areCrDecomposed and removed by microorganisms, organic nitrogen is aminated into ammonia nitrogen, then the ammonia nitrogen flows into a combined biological denitrification tank through an anaerobic sedimentation tank, the residual organic matters in the wastewater are decomposed and removed by the microorganisms again, the ammonia nitrogen generates nitrate nitrogen after nitration reaction by nitrobacteria, and the nitrate nitrogen is decomposed by denitrifying bacteria to generate N2And discharging into the atmosphere, adding a coagulant into the system effluent, and then precipitating in a sedimentation tank to directly discharge. If the wastewater needs to be recycled, the wastewater needs to pass through a deep treatment unit of a raw wastewater treatment station before being recycled, insoluble organic matters in the wastewater are reduced again, and the wastewater is directly recycled for production after being sterilized.
3.4 general Process flow
The spandex water, the chinlon water, the domestic sewage, the TAD water and the polymerization cleaning filter screen water respectively enter a regulating and hydrolysis acidification tank after being pretreated, the water quality and the water quantity are regulated, the biodegradability of the wastewater is improved, and then the wastewater enters a biochemical system for treatment.
The total wastewater treatment process flow part mainly comprises the following steps: a regulating and hydrolyzing acidification tank, a UASB, an anaerobic sedimentation tank, a combined biological denitrification tank, a sedimentation tank and the like.
3.4.1 Regulation and hydrolysis acidification pool
The adjusting and hydrolyzing acidification tank is used for adjusting the water quantity and homogenizing the water quality, so that the sewage can uniformly enter a subsequent treatment unit. The water quality is balanced and the water quantity is regulated in the acidification tank, and part of COD in the wastewater is removed by hydrolysis acidificationCrAnd the macromolecular organic matters are decomposed into micromolecular organic matters, so that the biodegradability of the wastewater is improved, and the treatment load of a subsequent sewage treatment unit is reduced. 2 diving plug flow mixers are arranged in the pool to mix water evenly.
3.4.2 UASB
The Upflow Anaerobic Sludge Blanket (UASB) process is developed on the basis of upflow anaerobic biofilm process, and has the dual characteristics of anaerobic filtration and anaerobic activated sludge process. The UASB consists of a sludge reaction area, a gas-liquid-solid three-phase separator (including a sedimentation area) and a gas chamber. A large amount of anaerobic sludge is reserved in the bottom reaction zone, and sludge with good settling property and coagulation property forms a sludge layer at the lower part. The sewage to be treated flows into the anaerobic sludge bed from the bottom of the anaerobic sludge bed to be mixed and contacted with the sludge in the sludge bed, and the microorganisms in the sludge decompose the organic matters in the sewage and convert the organic matters into methane. The biogas is released continuously in the form of micro bubbles, the micro bubbles are combined continuously in the rising process to form larger bubbles gradually, sludge with thinner sludge concentration is formed at the upper part of a sludge bed due to the stirring of the biogas and rises together with water to enter a three-phase separator, when the biogas touches a reflecting plate at the lower part of the separator, the biogas is folded around the reflecting plate, then the biogas passes through a water layer to enter a gas chamber and is concentrated in the gas chamber, the biogas is guided out by a guide pipe, a solid-liquid mixed liquid enters a settling zone of the three-phase separator through reflection, the sludge in the sewage is flocculated, particles are gradually increased, and the sludge is settled under the action of gravity. The sludge deposited on the inclined wall slides back to the anaerobic reaction zone along the inclined wall, so that a large amount of sludge is accumulated in the reaction zone, treated effluent water separated from the sludge overflows from the upper part of an overflow weir of the deposition zone, and then is discharged out of a sludge bed.
UASB reaction tank: converting part of organic matter into CH by using biochemical action of anaerobic microorganism4And CO2And the biodegradability of the wastewater is improved, and the treatment difficulty of a subsequent treatment unit is reduced. The ammonification of ammonifying bacteria in the UASB reaction tank converts organic nitrogen in the wastewater into ammonia nitrogen so as to be beneficial to subsequent nitrification removal. The sludge in the anaerobic reactor can be circulated.
3.4.3 Combined biological denitrification pool
The Bardenpho process is a nitrification/denitrification process, i.e., a primary A/O process followed by a series of A/O systems (pre-A/O and post-A/O). The preposed anoxic tank utilizes the reflux of the aerobic section and the denitrification of the organic matrix in the raw water, and the reaction rate is higher; in order to meet the requirement of denitrification of the effluent, endogenous denitrification is carried out in the post-anoxic tank, and in order to ensure the smooth proceeding of the post-A/O denitrification, a carbon source is supplemented according to the effluent quality of the pre-A/O system, wherein the supplement amount is 352-528 kgCOD/d.
In order to give full play to the activity of various organisms and better meet the reaction conditions of microbial populations, the design of the wastewater treatment engineering project divides a front aerobic section into a carbon oxidation section O1And nitration section O2Carbon oxidation stage O1The dissolved oxygen is low, heterotrophic bacteria are dominant, and the COD is exerted to the maximum extentCrThe removal effect of (1); in the nitration stage, due to most of CODCrThe nitrogen and carbon ratio of the inlet water is low, and the dissolved oxygen is controlled at a high level, so that the propagation of nitrifying bacteria is facilitated, and the ammonia nitrogen is fully nitrified into nitrate.
The residual sludge in the sedimentation tank partially flows back into 2 nitrification tanks of the biological denitrification tank, so that the sludge is partially digested in the nitrification tanks, and the sludge yield of the whole system is greatly reduced.
3.4.4 sludge concentration tank
And discharging residual sludge in the treatment system to a sludge concentration tank, reducing the volume of the sludge (by 70-80%) in the concentration tank through static sedimentation compression, and then conveying the sludge to a filter press for dehydration through a pneumatic diaphragm pump. And refluxing the supernatant and the filtrate to a regulating and hydrolyzing acidification tank, and transporting the mud cake outside for disposal.
4 main design parameters and model selection of each structure equipment
(1) Sump wells 1, 2
An underground type pool 1 with a reinforced concrete structure is adopted and respectively used as a water collecting well which is divided into two grids, wherein the water collecting well 1 receives mixed wastewater of spandex, chinlon and domestic sewage, and the water collecting well 2 receives TAD water in the chinlon water.
(2) Cooling tower
Adopting 1 BND-100 type counter-flow glass fiber reinforced plastic cooling tower for sewage, wherein the cooling water quantity is 41m3And the temperature difference is 10 ℃ (determined according to the outdoor temperature), the water is placed on the roof of the blower room, and the outlet water enters the adjusting and hydrolyzing acidification tank.
(3) Adjusting and hydrolyzing acidification pool
The adjusting and hydrolyzing acidification tank is transformed from an adjusting tank and a refined wastewater buffer tank of a raw sewage treatment station, and receives pretreated TAD water, polymerization cleaning filter screen water after air flotation treatment and wastewater flowing in a cooling tower.
(4) UASB reaction tank
2 original UASB reaction tanks of the sewage treatment station adopt rectangular tanks with reinforced concrete structures, and effluent of the UASB reaction tanks automatically flows into anaerobic sedimentation tanks.
(5) Anaerobic sedimentation tank
The anaerobic sedimentation tank continuously uses a biological selection tank of a raw sewage treatment station, 2 seats, supernatant automatically flows into an anoxic tank of the combined biological denitrification tank, and settled sludge regularly flows back to the UASB reaction tank.
(6) Air floatation system
The air floatation system selects 10m3And h, treating by dissolved air floatation, and leading water of a filter screen of the polymerization cleaning filter to enter a hydrolysis acidification tank after air floatation treatment. The reconstruction project does not contain polymerized filter screen cleaning water (150 m)3And/d) conveying the air float and the scum to a sludge tank part pipeline.
(7) Sedimentation tank
The sedimentation tank adopts a circular tank with a reinforced concrete structure, 1-seat radial sedimentation, sludge in the biological denitrification tank is added with coagulant (PAC, PAM), mixed uniformly by a pipeline mixer and then enters the sedimentation tank for sedimentation, supernatant liquid flows back to enter the denitrification tank, partial sludge flows back to enter the two nitrification tanks, and residual sludge is discharged into the sludge tank.
(8) Micro-electrolysis reactor
The micro-electrolysis reactor carries out micro-electrolysis treatment on the TAD wastewater, improves the biodegradability of the TAD wastewater, and reduces the inhibition effect of the TAD wastewater on biochemical treatment microorganisms. And the effluent of the micro-electrolysis reactor enters a Fenton reactor for oxidation treatment.
(9) Fenton reactor
The micro-electrolysis reactor carries out micro-electrolysis treatment on the TAD wastewater, improves the biodegradability of the TAD wastewater, and reduces the inhibition effect of the TAD wastewater on biochemical treatment microorganisms. And the effluent of the micro-electrolysis reactor enters a Fenton reactor for oxidation treatment.
(10) PH adjusting tank
The raw sewage treatment station is provided with reaction tanks 1 and 2, wherein the reaction tanks are subjected to Q235+ corrosion prevention, the middle part is separated by a partition plate, the reaction tank 1 is transformed into a pH adjusting tank of TAD wastewater, and the tank effluent of the pH adjusting tank is lifted to a micro-electrolysis reactor by a pump.
(11) Sludge thickening tank
The sludge concentration tank adopts an underground square tank with a reinforced concrete structure and receives residual sludge discharged from the sedimentation tank. Part of sludge flows back into the aerobic aeration tank, and the rest sludge flows back into the high-efficiency anaerobic ammoniation anaerobic reactor and hydrolytic acidification, and part of sludge is dehydrated.
Remarking: the expected grading removal rate is only the reference data of process design, and the project acceptance standard is subject to the actual effluent and the national standard defined in the scheme.
Claims (1)
1. A sewage treatment system of a chemical fiber plant, which is characterized in that,
spandex, chinlon and domestic sewage are converged and connected with a water collecting well 1, the water collecting well 1 is connected with a cooling tower through a pump, and the cooling tower is connected with an adjusting and hydrolyzing acidification tank;
a filter screen water pipe of the polymerization cleaning filter is connected with a filter screen water circulation tank, the filter screen water circulation tank is connected with an air floating device, and the air floating device is connected with a regulating and hydrolysis acidification tank through a pipeline;
the TAD water pipe is connected with the water collecting well 2, the water collecting well 2 is connected with a PH adjusting tank through a pump, the PH adjusting tank is connected with the micro-electrolysis reactor through a pipeline, and the micro-electrolysis reactor is connected with the adjusting and hydrolysis acidification tank through a pipeline;
the adjusting and hydrolyzing acidification tank is connected with the UASB reaction tank through a pump, sludge in the UASB reaction tank enters a sludge concentration tank, effluent enters an anaerobic sedimentation tank, a middle-layer sludge pipe of the anaerobic sedimentation tank is connected with the adjusting and hydrolyzing acidification tank and the UASB reaction tank, a residual sludge pipe of the anaerobic sedimentation tank is connected with the sludge concentration tank, and an upper clear liquid pipe of the anaerobic sedimentation tank is connected with a denitrification tank;
the combined biological denitrification tank is divided into 4 grids which are respectively a denitrification tank, a nitrification tank A, a nitrification tank B and a denitrification tank C in sequence, elastic fillers are arranged in the denitrification tanks, and NO in the backflow wastewater is enabled to flow back under the action of denitrifying bacteria inhabiting the fillers2 -、NO3 -Conversion to N2Thereby meeting the requirement of biological denitrification;
the denitrification tank C is connected with the sedimentation tank, the sedimentation tank is connected with the nitrification tank A and the nitrification tank B through a pump, and a residual sludge pipeline of the sedimentation tank is connected with a sludge concentration tank;
the upper clear liquid pipe of the sludge concentration tank is connected with the adjusting and hydrolyzing acidification tank, the sludge concentration tank is also connected with the box-type filter press through a pump, and the filtrate pipe of the box-type filter press is connected with the adjusting and hydrolyzing acidification tank;
a part of clear liquid pipe close to the sludge in the sedimentation tank is connected with the denitrification tank, and a supernatant liquid pipe in the sedimentation tank is connected with the discharge tank;
and a grid is arranged on the water collecting well 1 and the water collecting well 2.
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| CN109987794A (en) * | 2019-04-25 | 2019-07-09 | 云南今业生态建设集团有限公司 | A kind of chemical fibre factory's sewage disposal system |
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