CN114804547A - High-concentration organic wastewater treatment system and method - Google Patents
High-concentration organic wastewater treatment system and method Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention belongs to the technical field of industrial wastewater treatment, and discloses a high-concentration organic wastewater treatment system and a method, wherein the method comprises the following steps: pumping the high-concentration organic wastewater into a wastewater storage tank and then discharging the high-concentration organic wastewater into an adjusting tank, pumping a middle-layer emulsion in the adjusting tank to a paper tape filter, filtering the high-concentration organic wastewater, entering a circulating tank, concentrating the high-concentration organic wastewater, and mixing the ultrafiltration effluent and the dilute oily wastewater in a primary sedimentation tank by an ultrafiltration device; effluent of the primary sedimentation tank flows into a neutralization system, the neutralized wastewater is pumped to a cooling tower to be cooled and then flows into a pre-aeration regulating reservoir, effluent of the aeration regulating reservoir enters an inclined plate sedimentation tank, a flocculating agent and a coagulant aid are put into the inclined plate sedimentation tank, the effluent enters an EPD sand filter tank to be filtered and then enters an ozone catalytic oxidation tower, and the standard water after the ozone catalytic oxidation is discharged. The high-concentration organic wastewater treatment system and the method can effectively degrade pollutants in the wastewater, realize the resource recovery of the waste oil, reduce the dosage of the medicament, reduce the operation cost of enterprises and have obvious environmental benefit and economic benefit.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a high-concentration organic wastewater treatment system and method.
Background
High concentration organic waste water is a kind of waste water with high concentration of organic substances generated and discharged in industrial, agricultural and other production activities, and the waste water contains a large amount of organic substances such as cellulose, fat, protein and aromatic compounds, and the COD of the waste water is usually above 2000mg/L, and some waste water even reaches tens of thousands to hundreds of thousands mg/L. The high-concentration organic wastewater has the characteristics of high organic matter concentration, complex components, high treatment difficulty and the like.
The treatment technology of high-concentration organic wastewater mainly comprises the following aspects: the first is a physical and chemical treatment technology, and the prior methods are extraction, adsorption, coagulation, membrane separation and the like. The physicochemical treatment method of the high-concentration organic wastewater has the advantages of low energy consumption, simple process flow, convenient operation and management and the like, but the organic pollutants are not radically degraded, and the simple pollution treatment method only simply transfers the organic pollutants from a liquid phase to a solid or another liquid phase, so that the simple pollution treatment method can not meet the discharge control requirement of the high-concentration organic wastewater. If the organic pollutants in the high-concentration organic wastewater are completely degraded, advanced oxidation technology and biological treatment technology are often required. The high-concentration organic wastewater has wide sources and complex and various components, is difficult to treat completely by using a single technology, and can achieve good treatment effect only by the cooperation of pretreatment and subsequent advanced treatment technology although the biological treatment technology occupies the most important part in a high-concentration organic wastewater treatment system.
Disclosure of Invention
The present invention aims to solve the above technical problem at least to some extent. Therefore, the invention aims to provide a high-concentration organic wastewater treatment system and a high-concentration organic wastewater treatment method.
The technical scheme adopted by the invention is as follows:
a high-concentration organic wastewater treatment system comprises a wastewater storage tank, an adjusting tank, a paper tape filter, a circulating tank, an ultrafiltration device, a primary sedimentation tank, a neutralization system, a cooling tower, a pre-aeration adjusting tank, an inclined plate sedimentation tank, an EPD sand filter tank and an ozone catalytic oxidation tower which are connected in sequence; the primary sedimentation tank is also connected with a thin oily wastewater collection device.
Preferably, the primary sedimentation tank is connected with a sludge adjusting and concentrating tank through a sludge pump, and the sludge adjusting and concentrating tank is connected with a centrifugal dehydrator.
Preferably, the neutralization system comprises a primary neutralization tank, a secondary neutralization tank and a neutralization collection tank which are connected in sequence.
Preferably, the paper tape filter is connected with the regulating reservoir through a delivery pump, and the delivery pump is used for pumping the middle-layer emulsion in the regulating reservoir to the paper tape filter.
Preferably, a heating device and an oil skimming machine are arranged in the adjusting tank; an oil skimming machine is arranged in the primary sedimentation tank.
Preferably, the EPD sand filtration tank comprises a first-stage filtration tank and a second-stage filtration tank, wherein the filter medium of the first-stage filtration tank is quartz sand with the particle size of 0.7-1.0 mm and the nonuniform coefficient of less than 1.4, and the filter medium of the second-stage filtration tank is garnet with the particle size of 0.3-0.4 mm and the nonuniform coefficient of less than 1.5.
A method for treating high-concentration organic wastewater comprises the following steps: pumping high-concentration organic wastewater into a wastewater storage tank, then discharging the high-concentration organic wastewater into an adjusting tank at a small flow rate, pumping a middle-layer emulsion in the adjusting tank to a paper tape filter, filtering, then entering a circulating tank, concentrating until the multiple meets the requirement, and then passing through an ultrafiltration device, wherein ultrafiltration effluent and dilute oily wastewater are mixed in a primary sedimentation tank; the effluent of the primary sedimentation tank flows into a neutralization system, when the water temperature of the neutralized wastewater is greater than the preset temperature, the neutralized wastewater flows into a pre-aeration regulating tank after being pumped to a cooling tower for cooling, the effluent of the aeration regulating tank enters an inclined plate sedimentation tank, a flocculating agent and a coagulant aid are added into the inclined plate sedimentation tank, the effluent enters an EPD sand filter tank for filtration and then enters an ozone catalytic oxidation tower, and the standard water after the ozone catalytic oxidation is discharged for later use.
Preferably, the sediment and the oil sludge in the primary sedimentation tank are pumped to a sludge adjusting and concentrating tank and are sent to a centrifugal dehydrator after being concentrated. And (5) conveying the dewatered sludge to a storage yard.
Preferably, the effluent of the primary sedimentation tank flows into a neutralization system, passes through a primary neutralization tank, enters a secondary neutralization tank after neutralization, and flows into a neutralization collection tank after neutralization.
Preferably, the concentration multiple of the feed liquid in the circulating tank is controlled between 30 and 50 times, and cannot exceed 50 times, and the feed liquid cannot enter the ultrafiltration device and is pumped back to the regulating tank when the concentration multiple of the feed liquid exceeds 50 times.
The invention has the beneficial effects that:
1. the high-concentration organic wastewater treatment system and method provided by the invention can effectively degrade pollutants in wastewater, can realize resource recovery of waste oil, reduce the dosage of medicaments, reduce the operation cost of enterprises, and have obvious environmental benefit and economic benefit.
2. Establish a waste water reservoir above the equalizing basin and collect high concentration organic waste water, discharge gradually the equalizing basin with less flow again, can avoid the fluctuation of water to cause the impact to the equalizing basin, influence normal operating.
3. Aiming at the characteristics of high-concentration organic wastewater, a 'paper tape filtration and ultrafiltration' process is selected as a pretreatment process, so that the wastewater treatment efficiency can be effectively improved, and the wastewater recycling is realized.
4. The preaeration tank is provided with combined filler which can be used as a carrier of biological oriented bacteria, and the flora can be attached to the filler to specially remove oil and COD.
5. The sand filter tank adopts two-stage series connection, can effectively remove suspended matters to reduce turbidity, and ensures that the effluent meets the water inlet requirement of the ozone catalytic oxidation tower.
Drawings
FIG. 1 is a flow chart of the method for treating high concentration organic wastewater according to the present invention.
Detailed Description
The present invention is further illustrated below with reference to specific examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1, the high concentration organic wastewater treatment system of the embodiment comprises a wastewater storage tank, an adjusting tank, a paper tape filter, a circulation tank, an ultrafiltration device, a primary sedimentation tank, a neutralization system, a cooling tower, a pre-aeration adjusting tank, an inclined plate sedimentation tank, an EPD sand filter tank and an ozone catalytic oxidation tower which are connected in sequence; the primary sedimentation tank is also connected with a thin oily wastewater collection device.
The primary sedimentation tank is connected with a sludge adjusting and concentrating tank through a sludge pump, and the sludge adjusting and concentrating tank is connected with a centrifugal dehydrator. The centrifugal dehydrator is small in occupied area and can continuously desliming, the condition that the filter cloth is blocked when other dehydrators are used can be avoided, the water content of sludge discharged by the centrifugal dehydrator is less than 78%, and the problems that the filter cloth is quickly blocked, the filter cloth is difficult to clean and the filter pressing amount of the sludge is continuously reduced due to a plate-and-frame filter press are solved. The spiral sludge conveyer, the sludge adjusting concentrator and the dosing equipment are matched with the sludge treatment device.
The paper tape filter is connected with the regulating tank through a delivery pump. The lining of the regulating tank adopts an epoxy resin glass reinforced plastic anticorrosive layer, and a heating device and an oil skimmer are arranged in the regulating tank and used for maintaining the temperature of the wastewater at about 60 ℃.
The concentration multiple of the feed liquid in the circulating tank is controlled between 30 and 50 times and cannot exceed 50 times, and the feed liquid cannot enter the ultrafiltration device when the concentration multiple exceeds 50 times and is pumped back to the regulating tank, so that the ceramic membrane of the ultrafiltration device can be prevented from being seriously polluted and the flux cannot be recovered through cleaning.
The ultrafiltration device adopts an inorganic ceramic ultrafiltration membrane, the aperture of the membrane is 4-10nm, the pressure difference between an inlet and an outlet is more than or equal to 0.2MPa, a nitric acid cleaning facility and a special base cleaning agent are configured for cleaning in consideration of the blockage of the ultrafiltration membrane, the dosage of nitric acid is ensured to be between 3 and 5 percent during each cleaning, the dosage of the special base cleaning agent is ensured to be between 2 and 3 percent, the cleaning time is 30 minutes, and the cleaning temperature is about 60 ℃. The pipeline of the filtering system of the ultrafiltration device is made of stainless steel, and the material of the discharge part is PVC.
An oil skimming machine is arranged in the primary settling tank, and floating oil in the primary settling tank flows into the waste oil collecting tank after being skimmed by the oil skimming machine.
The neutralization system comprises a primary neutralization tank, a secondary neutralization tank and a neutralization collection tank which are connected in sequence.
The pre-aeration adjusting tank is internally provided with combined filler, the aeration pipe adopts a closed-cell aeration hose, and is fixed at the bottom of the tank by an ABS engineering plastic fixing piece.
The tank body of the inclined plate sedimentation tank adopts carbon steel lining FRP, the thickness of the steel plate is not less than 8mm, and the thickness of the FRP lining is not less than 3mm in principle.
The EPD sand filtration tank comprises a primary filtration tank and a secondary filtration tank which are connected in series, wherein the filter medium of the primary filtration tank is quartz sand, the particle size is 0.7-1.0 mm, the nonuniform coefficient is less than 1.4, the filter medium of the secondary filtration tank is garnet, the particle size is 0.3-0.4 mm, and the nonuniform coefficient is less than 1.5. The primary filtration tank adopts a time backwashing mode, the secondary filtration tank adopts a differential pressure backwashing mode, and the backwashing time is 3 minutes per tank. The first-stage filter tank and the second-stage filter tank are provided with independent backwashing pipelines respectively, so that different backwashing flow rates are ensured. During filtering, water enters the tank body after passing through the water inlet pipe and the hydraulic valve, the water is filtered, the back flushing water inlet of the hydraulic valve is in a closed state at the moment, and the filtered water enters the water collecting pipe after being collected by the water collector and is sent out to the water outlet pipe through the outlet of the hydraulic valve.
The tower body of the ozone catalytic oxidation tower is made of carbon steel lined glass fiber reinforced plastics, the filter plate is made of SS316L, the filter plate must be provided with a reinforcing support, the thickness of the filter plate is not less than 22mm, the filter head is made of SS316L/ABS, the water and gas distribution pipeline is SS316L, the aeration head is made of titanium alloy, the ozone catalytic oxidation reaction ozone generator is of an air source type, and the ozone concentration is 15g/m 3 。
The working principle of the high-concentration organic wastewater treatment system is as follows: high concentration organic waste water is from workshop drain pit pump package pump income equalizing basin top waste water reservoir, discharges into the equalizing basin gradually with less flow again, and transfer pump to paper tape filter for the equalizing basin middle level emulsion gets into ultrafiltration device's circulation inslot after filtering, and the interior multiple of concentration of circulation inslot accords with passing through ultrafiltration device afterwards that requires, and concentrated waste oil is got back to the takeaway of waste oil collecting vat. Mixing the ultrafiltered effluent and thin oily wastewater (cleaning water of degreased steel plates of a degreasing unit, a continuous annealing unit, a hot galvanizing unit and the like) in a primary sedimentation tank, skimming floating oil in the tank by an oil skimming machine, then flowing into a waste oil collecting tank, depositing sediment and oil sludge in water at the bottom of the tank, then sending into a sludge regulating and concentrating tank by a sludge pump, then sending into a centrifugal dehydrator, and sending into a storage yard after dehydration. The effluent of the primary sedimentation tank flows into a primary neutralization tank by gravity, enters a secondary neutralization tank after neutralization, and then flows into a neutralization collection tank. The pH value of the primary neutralization tank and the secondary neutralization tank is adjusted by adding HCl or liquid alkali, low-pressure air is introduced for aeration, part of reducing substances are oxidized, the stirring effect is enhanced, and oil-water separation and degradation of part of oil substances are realized. When the water temperature of the neutralization collection tank is higher than 35 ℃, the wastewater is pumped into a cooling tower to be cooled and automatically flows into a pre-aeration regulating reservoir, the effluent of the pre-aeration regulating reservoir enters an inclined plate sedimentation tank, a flocculating agent and a coagulant aid are added into the inclined plate sedimentation tank, the coagulant aid is polyacrylamide, the concentration of the polyacrylamide is prepared to be 1%, the effluent enters an EPD sand filter tank, the wastewater enters a secondary filter tank after passing through a primary filter tank, the effluent of the secondary filter tank enters an ozone catalytic oxidation tower, and the effluent after the ozone catalytic oxidation automatically flows to a final effluent tank for later use.
The method for treating high-concentration organic wastewater provided by the embodiment of the invention uses the high-concentration organic wastewater treatment system, and specifically comprises the following steps:
the high-concentration organic wastewater comes from waste liquid discharged from an alkali liquid degreasing tank of a cold rolling degreasing unit, a leveling unit and a continuous annealing unit, but is not limited to the wastewater; the water quality index of the high-concentration organic wastewater is shown in Table 1.
TABLE 1 Water quality index of high concentration organic wastewater
| Index (I) | pH | COD | Electrical conductivity of | SS | Total oil |
| Unit of | mg/L | us/cm | mg/L | mg/L | |
| High concentration organic waste water | 9～10 | 6000～7000 | 400～4000 | 400～800 | 1000～2000 |
Pumping the high-concentration organic wastewater into a wastewater storage pool from a workshop drainage pit pump set, and gradually discharging the high-concentration organic wastewater into a regulating pool below the wastewater storage pool at a small flow rate, wherein the regulating pool is used for removing floating oil and providing balanced water flow for subsequent treatment.
The emulsion in the middle layer of the regulating tank is pumped to a paper tape filter, filtered and then enters a circulating tank of an ultrafiltration device, and then passes through the ultrafiltration device, the content of ultrafiltration water and oil is less than 10mg/L, the water quality is transparent and clear, a certain amount of organic components (COD exceeds the discharge standard) still exist, and the pH value is larger, so further system treatment is needed.
And mixing the ultrafiltration effluent and the dilute oily wastewater in a primary settling tank, wherein the oil concentration in the mixed water is 100-200 mg/L. The floating oil in the pool is skimmed by an oil skimmer and then flows into a waste oil collecting pool. And (4) after the sediment and the oil sludge in the water are deposited into the bottom of the tank, pumping the sediment and the oil sludge into a sludge regulating and concentrating tank.
And the sludge is sent into a sludge adjusting and concentrating tank, then sent into a centrifugal dehydrator, and sent into a storage yard after dehydration.
The effluent of the primary sedimentation tank flows into a primary neutralization tank by gravity, enters a secondary neutralization tank after neutralization, and then flows into a neutralization collection tank. When the water temperature of the neutralization collection tank is higher than 35 ℃, the wastewater is pumped into a cooling tower for cooling and flows into a pre-aeration regulating tank automatically.
The effluent of the pre-aeration regulating tank directly enters an inclined plate sedimentation tank, a flocculating agent and a coagulant aid are added into the inclined plate sedimentation tank, the flocculating agent adopts a medicament with an oil removal effect, and the coagulant aid adopts polyacrylamide. And when the sedimentation is achieved, a part of oil pockets are clamped in the sediment and separated out, so that the oil removing effect is enhanced.
The water discharged from the inclined plate sedimentation tank enters an EPD sand filter tank, the water discharged from the EPD sand filter tank enters an ozone catalytic oxidation tower, the water reaching the standard after the ozone catalytic oxidation is discharged for later use, and the water quality of the water discharged from the ozone catalytic oxidation tower is shown in a table 2.
TABLE 2 quality of inlet and outlet water of ozone catalytic oxidation tower
The effluent quality index after the catalytic oxidation by ozone is superior to the requirement of the emission standard of pollutants for water in the steel industry (GB13456-2012), and the COD removal rate is shown in Table 3.
TABLE 3 COD removal Rate Table
| Index (I) | Raw water of primary sedimentation tank | Precipitation of | Oxidation by oxygen |
| COD | 1000～1500 | 150～160 | 50～60 |
| COD removal rate | / | 85～89％ | 62～66％ |
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (10)
1. A high concentration organic waste water processing system which characterized in that: comprises a wastewater storage tank, an adjusting tank, a paper tape filter, a circulating tank, an ultrafiltration device, a primary sedimentation tank, a neutralization system, a cooling tower, a pre-aeration adjusting tank, an inclined plate sedimentation tank, an EPD sand filter tank and an ozone catalytic oxidation tower which are connected in sequence; the primary sedimentation tank is also connected with a thin oily wastewater collection device.
2. The high concentration organic wastewater treatment system according to claim 1, wherein: the primary sedimentation tank is connected with a sludge adjusting and concentrating tank through a sludge pump, and the sludge adjusting and concentrating tank is connected with a centrifugal dehydrator.
3. The high concentration organic wastewater treatment system according to claim 1, wherein: the neutralization system comprises a primary neutralization tank, a secondary neutralization tank and a neutralization collection tank which are connected in sequence.
4. The high concentration organic wastewater treatment system according to claim 1, wherein: the paper tape filter is connected with the regulating reservoir through a delivery pump, and the delivery pump is used for pumping the emulsion in the regulating reservoir to the paper tape filter.
5. The high concentration organic wastewater treatment system according to claim 1, wherein: a heating device and an oil skimming machine are arranged in the regulating tank; an oil skimming machine is arranged in the primary sedimentation tank.
6. The high concentration organic wastewater treatment system according to claim 1, wherein: EPD sand filtration jar includes that the primary filter jar filters jar and second grade and filters the jar, and the filter medium of primary filter jar is the quartz sand, and the particle diameter is 0.7 ~ 1.0mm, and the inhomogeneous coefficient is less than 1.4, and the filter medium of second grade filtration jar is garnet, and the particle diameter is 0.3 ~ 0.4mm, and the inhomogeneous coefficient is less than 1.5.
7. A method for treating high-concentration organic wastewater is characterized by comprising the following steps: pumping high-concentration organic wastewater into a wastewater storage tank, then discharging the high-concentration organic wastewater into an adjusting tank at a small flow rate, pumping a middle-layer emulsion in the adjusting tank to a paper tape filter, filtering, then entering a circulating tank, concentrating until the multiple meets the requirement, and then passing through an ultrafiltration device, wherein ultrafiltration effluent and dilute oily wastewater are mixed in a primary sedimentation tank; the effluent of the primary sedimentation tank flows into a neutralization system, when the water temperature of the neutralized wastewater is greater than the preset temperature, the neutralized wastewater flows into a pre-aeration regulating tank after being pumped to a cooling tower for cooling, the effluent of the aeration regulating tank enters an inclined plate sedimentation tank, a flocculating agent and a coagulant aid are added into the inclined plate sedimentation tank, the effluent enters an EPD sand filter tank for filtration and then enters an ozone catalytic oxidation tower, and the standard water after the ozone catalytic oxidation is discharged for later use.
8. The method for treating high concentration organic wastewater according to claim 1, wherein: and pumping the sediments and the oil sludge in the primary sedimentation tank to a sludge adjusting and concentrating tank, and conveying the sludge to a centrifugal dehydrator after concentration. And (5) conveying the dewatered sludge to a storage yard.
9. The method for treating high concentration organic wastewater according to claim 1, wherein: the effluent of the primary sedimentation tank flows into a neutralization system, passes through a primary neutralization tank, enters a secondary neutralization tank after neutralization, and flows into a neutralization collection tank after neutralization.
10. The method for treating high concentration organic wastewater according to claim 1, wherein: the concentration multiple of the feed liquid in the circulating tank is controlled between 30 and 50 times and cannot exceed 50 times, and the feed liquid cannot enter the ultrafiltration device and is pumped back to the regulating tank when the concentration multiple exceeds 50 times.
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| CN202210623598.4A CN114804547A (en) | 2022-06-02 | 2022-06-02 | High-concentration organic wastewater treatment system and method |
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Cited By (1)
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Application publication date: 20220729 |