CN111233254A - Reinforced biological membrane wastewater treatment process - Google Patents
Reinforced biological membrane wastewater treatment process Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
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Abstract
The invention relates to a reinforced biomembrane wastewater treatment process, which comprises the following steps of wastewater pretreatment: introducing the wastewater into an ABR reaction tank, introducing the pretreated wastewater into an aerobic tank, arranging a filler in the aerobic tank, and continuously oxygenating the aerobic tank; the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment; introducing the wastewater precipitated in the intermediate sedimentation tank into a coagulation tank, and adding a pH regulator and a coagulant aid into the coagulation tank; the wastewater after coagulation treatment enters a flocculation tank, and a flocculating agent is added into the flocculation tank; and (4) the wastewater after the flocculation reaction enters an inclined tube sedimentation tank for sludge-water separation. The invention organically combines the biomembrane process with the traditional biological wastewater treatment technology, greatly improves the solid-liquid separation efficiency, and improves the biochemical reaction rate due to the increase of the concentration of the activated sludge in the aerobic tank and the appearance of specific bacteria in the sludge.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a reinforced biological membrane wastewater treatment process.
Background
Modern industrial sewage pollutes water bodies seriously, so that more and more underground water and drinking water are polluted, the economic benefit of people is damaged, and the body health of people is influenced, so people always find a method for effectively and reasonably treating the industrial sewage. In the traditional biological wastewater treatment technology, mud-water separation is completed in a secondary sedimentation tank under the action of gravity, the separation efficiency depends on the sedimentation performance of activated sludge, the sedimentation performance is better, the mud-water separation efficiency is higher, the sedimentation performance of the sludge depends on the operation condition of an aeration tank, the operation condition of the aeration tank must be strictly controlled for improving the sedimentation performance of the sludge, and the application range of the method is limited. Due to the requirement of solid-liquid separation of the secondary sedimentation tank, the sludge in the aeration tank can not maintain higher concentration, generally about 1.5-3.5 g/L, so that the biochemical reaction rate is limited, the Hydraulic Retention Time (HRT) and the sludge age (SRT) are mutually dependent, the increase of the volume load and the reduction of the sludge load are often in contradiction, the traditional activated sludge treatment system is easy to have the sludge expansion phenomenon, the effluent contains suspended solids, and the effluent quality is deteriorated.
MBR (membrane bioreactor) is a new sewage treatment device formed by combining ultra-micro filtration membrane separation technology and a bioreactor in sewage treatment, the reactor integrates the advantages brought by membrane treatment technology and biological treatment technology, and ultra-micro filtration membrane components and micro filtration membrane components are used as mud-water separation units and can completely replace secondary sedimentation tanks.
But the MBR biofilm process has the problems of high one-time investment cost, high automatic control degree, high operation cost, high maintenance cost caused by the regular need of replacing the MBR membrane and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a reinforced biological membrane wastewater treatment process, which organically combines an MBR biological membrane process with the traditional wastewater biological treatment process, greatly improves the solid-liquid separation efficiency, improves the biochemical reaction rate due to the increase of the concentration of activated sludge in an aerobic tank and the occurrence of specific bacteria in the sludge, not only strengthens the treatment efficiency of the traditional biological treatment process, but also solves the problems of the MBR biological membrane process.
The above object of the present invention is achieved by the following technical solutions: a reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and the aerobic tank is continuously oxygenated;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated in the intermediate sedimentation tank into a coagulation tank, adding a pH regulator into the coagulation tank to regulate the pH of the wastewater to 7.5-8.5, and then adding a coagulant aid into the coagulation tank, wherein the adding amount of the coagulant aid is 60-100 ppm;
step 5, a flocculation tank: feeding the wastewater treated in the step 4 into a flocculation tank, and adding a flocculating agent into the flocculation tank, wherein the adding amount of the flocculating agent is 2-4 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
Through adopting above-mentioned technical scheme, waste water enters into and carries out anaerobic reaction in the ABR reaction tank, through anaerobic microorganisms's effect under the condition of absolutely contacting with the air, decomposes the complicated macromolecule organic matter in the waste water and converts into the micromolecule material, can reduce the concentration of organic matter in the waste water, improves the biodegradability of waste water. The waste water after anaerobic treatment enters an aerobic tank, a filler is arranged in the aerobic tank for the attachment and growth of microorganisms, oxygen is continuously introduced into the aerobic tank, so that the waste water in the aerobic tank is in a flowing state, the waste water is fully contacted with the filler in the waste water, the biological membrane adsorbs organic matters in the waste water, the organic matters are oxidized and decomposed by the microorganisms under the aerobic condition, and the waste water is purified. After the biofilm grows to a certain thickness, microorganisms on the wall of the filler can carry out anaerobic metabolism due to oxygen deficiency, and generated gas and flushing action formed by introducing oxygen or falling of the biofilm are caused, so that a small amount of microorganisms are suspended in the wastewater, and organic matters in the wastewater can be further removed. During the microorganism of suspension in the waste water flows into the sedimentation tank along with waste water, through the sediment in the sedimentation tank, the upper activated sludge of sedimentation tank bottom of the pool flows back to good oxygen pond, retrieves, can increase the concentration of the mud of suspension in the good oxygen pond, and then makes the total mud concentration increase in the good oxygen pond to improve the clearance of organic matter. Under the aerobic condition, ammonia nitrogen in the wastewater is oxidized into nitrite or nitrate, so that the removal rate of the ammonia nitrogen in the wastewater is improved, a coagulant aid is added into a coagulation tank for charge neutralization, the wastewater treatment effect is further improved, a flocculating agent is continuously added, the flocculating agent enables small particles in the wastewater to generate flocculating constituents with larger particles under the action of a net catching mode, rapid sedimentation is facilitated, after flocculation is finished, mud-water separation is carried out through an inclined tube sedimentation tank, supernatant is discharged, sludge is discharged into a sludge tank through a sludge discharge pump, after concentration, the sludge is dewatered by a sludge press, and sludge cakes are transported outside.
The present invention in a preferred example may be further configured to: and in the step 1, the wastewater stays in the ABR reaction tank for 12-60 hours.
By adopting the technical scheme, the retention time of the wastewater in the ABR reaction tank is short, and the decomposition of macromolecular organic matters is not complete enough, so that the difficulty of subsequent biochemical treatment is increased; the retention time is long, and the wastewater treatment efficiency is reduced.
The present invention in a preferred example may be further configured to: in the step 1, a biogas collecting pipeline is arranged above the ABR reaction tank, and is communicated with a plurality of branch pipes which are respectively communicated with each compartment of the ABR reaction tank.
By adopting the technical scheme, the biogas generated by each compartment is independently discharged, so that the gases generated in different stages in the anaerobic process are prevented from being mixed with each other.
The present invention in a preferred example may be further configured to: the pH regulator in the step 4 is calcium hydroxide.
By adopting the technical scheme, compared with other alkalis, the calcium hydroxide has low solubility in water, and can be slowly adjusted when being used for adjusting the pH value of the wastewater, so that the pH value of the wastewater is more stable and is easy to control.
The present invention in a preferred example may be further configured to: the coagulant aid in the step 4 at least comprises one of polyaluminium chloride, polyferric chloride and polyaluminium sulfate.
By adopting the technical scheme, the polyaluminium chloride, the polyferric chloride and the polyaluminium sulfate can eliminate or reduce the mutual repulsive force among the colloidal particles in the wastewater, so that the colloidal particles in the wastewater are easy to collide with each other and agglomerate to form larger particles or floccules, and then are separated from the water.
The present invention in a preferred example may be further configured to: and in the step 5, the flocculating agent at least comprises one of polyacrylamide and sodium polyacrylate.
By adopting the technical scheme, the polyacrylamide is a long chain molecular structure, the long chain of the polyacrylamide can be bent or curled into an irregular curve shape, a plurality of chemically active groups such as amide groups and carboxyl groups can extend outwards from the long molecular chain, the amide groups are nonionic groups, and the amide groups are easy to form secondary valence bonds and are adsorbed and connected with active groups of other substances. Because polyacrylamide molecules are long and fine and have many chemically active groups, they can form large flocs by making many bonds with the precipitated particles. The sodium polyacrylate can form ionic bonds with positively charged suspended particles due to the neutralization characteristic of surface charges, so that the suspended particles are condensed; in addition, the sodium polyacrylate also has an active adsorption function, and can adsorb suspended particles on the surface of the sodium polyacrylate so that the suspended particles are mutually aggregated to form a large floccule body and promote sedimentation.
The present invention in a preferred example may be further configured to: the mass ratio of the polyaluminium chloride to the polyferric chloride to the polyaluminium sulfate is 5: 2: 2.
by adopting the technical scheme, the effect of mixing and using the polyaluminium chloride, the polyferric chloride and the polyaluminium sulfate in the proportion is best, and the charge can be neutralized.
In summary, the invention includes at least one of the following beneficial technical effects:
1. waste water enters into the ABR reaction tank to carry out anaerobic reaction, and through anaerobic microorganism's effect under the condition of stopping and contacting with the air, the complicated macromolecule organic matter in with the waste water decomposes and converts the micromolecule material into, can reduce the concentration of organic matter in the waste water, improves the biodegradability of waste water. The waste water after anaerobic treatment enters an aerobic tank, a filler is arranged in the aerobic tank for the attachment and growth of microorganisms, oxygen is continuously introduced into the aerobic tank, so that the waste water in the aerobic tank is in a flowing state, the waste water is fully contacted with the filler in the waste water, the biological membrane adsorbs organic matters in the waste water, the organic matters are oxidized and decomposed by the microorganisms under the aerobic condition, and the waste water is purified. After the biofilm grows to a certain thickness, microorganisms on the wall of the filler can carry out anaerobic metabolism due to oxygen deficiency, and generated gas and flushing action formed by introducing oxygen or falling of the biofilm are caused, so that a small amount of microorganisms are suspended in the wastewater, and organic matters in the wastewater can be further removed;
2. during the microorganism of suspension in the waste water flows into the sedimentation tank along with waste water, through the sediment in the sedimentation tank, the upper activated sludge of sedimentation tank bottom of the pool flows back to good oxygen pond, retrieves, can increase the concentration of the mud of suspension in the good oxygen pond, and then makes the total mud concentration increase in the good oxygen pond to improve the clearance of organic matter. Under aerobic conditions, ammonia nitrogen in the wastewater is oxidized into nitrite or nitrate, so that the removal rate of the ammonia nitrogen in the wastewater is improved, a coagulant aid is added into a coagulation tank for charge neutralization, the wastewater treatment effect is further improved, a flocculating agent is continuously added, the flocculating agent enables small particles in the wastewater to generate flocculating constituents with larger particles under the action of a net catching mode, rapid sedimentation is facilitated, after flocculation is finished, mud-water separation is carried out through an inclined tube sedimentation tank, supernatant is discharged, sludge is discharged into a sludge tank through a sludge discharge pump, after concentration, the sludge is dewatered by a sludge press, and mud cakes are transported outside;
3. polyacrylamide is a long chain molecular structure, the long chain of which can be bent or curled into an irregular curve shape, and the long molecular chain can extend outwards to form a plurality of chemically active groups, such as amide groups and carboxyl groups, wherein the amide groups are nonionic groups and can easily form secondary valence bonds to be adsorbed and connected with active groups of other substances. Because polyacrylamide molecules are long and fine and have many chemically active groups, they can form large flocs by making many bonds with the precipitated particles. The sodium polyacrylate can form ionic bonds with positively charged suspended particles due to the neutralization characteristic of surface charges, so that the suspended particles are condensed; in addition, the sodium polyacrylate also has an active adsorption function, and can adsorb suspended particles on the surface of the sodium polyacrylate so that the suspended particles are mutually aggregated to form a large floccule body and promote sedimentation.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a schematic structural diagram of an aerobic tank and a middle sedimentation tank of the invention;
FIG. 3 is a schematic diagram of the structure of an ABR reaction cell of the present invention.
Reference numerals: 1. a biogas collection pipeline; 2. and (4) branch pipes.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
A reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and a Roots blower is arranged at the bottom of the aerobic tank to continuously oxygenate the aerobic tank;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated in the intermediate sedimentation tank into a coagulation tank, adding calcium hydroxide into the coagulation tank, adjusting the pH value of the wastewater to 7.5, and then adding polyaluminium chloride into the coagulation tank, wherein the adding amount of the polyaluminium chloride is 60 ppm;
step 5, a flocculation tank: the wastewater treated in the step 4 enters a flocculation tank, and polyacrylamide is added into the flocculation tank, wherein the adding amount of the polyacrylamide is 2 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
Example 2
A reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and a Roots blower is arranged at the bottom of the aerobic tank to continuously oxygenate the aerobic tank;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated in the intermediate sedimentation tank into a coagulation tank, adding calcium hydroxide into the coagulation tank, adjusting the pH value of the wastewater to 8.0, and then adding polyferric chloride into the coagulation tank, wherein the adding amount of the polyferric chloride is 80 ppm;
step 5, a flocculation tank: the wastewater treated in the step 4 enters a flocculation tank, and sodium polyacrylate is added into the flocculation tank, wherein the adding amount of the sodium polyacrylate is 3 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
Example 3
A reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and a Roots blower is arranged at the bottom of the aerobic tank to continuously oxygenate the aerobic tank;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated by the intermediate sedimentation tank into a coagulation tank, adding calcium hydroxide into the coagulation tank, adjusting the pH value of the wastewater to 8.5, and then adding polyaluminium chloride and polyaluminium sulfate into the coagulation tank, wherein the adding amount of the polyaluminium chloride is 50ppm, and the adding amount of the polyaluminium sulfate is 50 ppm;
step 5, a flocculation tank: the wastewater treated in the step 4 enters a flocculation tank, and polyacrylamide and sodium polyacrylate are added into the flocculation tank, wherein the adding amount of the polyacrylamide is 2ppm, and the adding amount of the sodium polyacrylate is 2 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
Example 4
A reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and a Roots blower is arranged at the bottom of the aerobic tank to continuously oxygenate the aerobic tank;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated by the intermediate sedimentation tank into a coagulation tank, adding calcium hydroxide into the coagulation tank, adjusting the pH value of the wastewater to 8.5, and then adding polyaluminium chloride and polyferric chloride into the coagulation tank, wherein the adding amount of the polyaluminium chloride is 50ppm, and the adding amount of the polyferric chloride is 35 ppm;
step 5, a flocculation tank: the wastewater treated in the step 4 enters a flocculation tank, and polyacrylamide is added into the flocculation tank, wherein the adding amount of the polyacrylamide is 4 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
Example 5
A reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and a Roots blower is arranged at the bottom of the aerobic tank to continuously oxygenate the aerobic tank;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated by the intermediate sedimentation tank into a coagulation tank, adding calcium hydroxide into the coagulation tank, adjusting the pH value of the wastewater to 8.5, and then adding polyaluminium chloride, polyferric chloride and polyaluminium sulfate into the coagulation tank, wherein the adding amount of the polyaluminium chloride is 50ppm, the adding amount of the polyferric chloride is 20ppm, and the adding amount of the polyaluminium sulfate is 20 ppm;
step 5, a flocculation tank: the wastewater treated in the step 4 enters a flocculation tank, and polyacrylamide is added into the flocculation tank, wherein the adding amount of the polyacrylamide is 4 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
Comparative example 1
A reinforced biological membrane wastewater treatment process specifically comprises the following steps:
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and a Roots blower is arranged at the bottom of the aerobic tank to continuously oxygenate the aerobic tank;
step 3, a sedimentation tank: the wastewater treated by the aerobic tank enters a sedimentation tank for sedimentation, the upper layer liquid is discharged to a coagulation tank, and the lower layer sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated by the precipitation tank into a coagulation tank, adding calcium hydroxide into the coagulation tank, adjusting the pH of the wastewater to 8.5, and then adding polyaluminium chloride and polyferric chloride into the coagulation tank, wherein the adding amount of the polyaluminium chloride is 50ppm, and the adding amount of the polyferric chloride is 35 ppm;
step 5, a flocculation tank: the wastewater treated in the step 4 enters a flocculation tank, and polyacrylamide is added into the flocculation tank, wherein the adding amount of the polyacrylamide is 4 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
The water quality discharged from the examples and comparative examples was measured as follows:
and (3) pH measurement: detecting with reference to GB/T6920-1986 glass electrode method for measuring pH value of water;
COD removal rate: detecting COD before and after wastewater treatment by referring to HJ828-2017 bichromate method for determining chemical oxygen demand of water quality, wherein the removal rate of the COD is (COD before treatment-COD after treatment)/COD before treatment;
biochemical oxygen demand for five days: detecting according to HJ505-2009 'method for determining, diluting and inoculating biochemical oxygen demand for five days of water quality';
suspended matters: the detection is carried out according to GB11901-1989 'gravimetric method for measuring suspended matters in water':
ammonia nitrogen: and detecting according to HJ535-2009 Nanshi reagent spectrophotometry for measuring ammonia nitrogen in water.
Table 1 shows the results of the effluent water quality measurements
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | |
| pH | 8.23 | 7.75 | 7.68 | 8.11 | 7.62 | 8.26 |
| COD removal Rate (%) | 87.5 | 88.6 | 89.4 | 90.6 | 92.7 | 75.3 |
| Five-day biochemical oxygen demand (mg/L) | 3.1 | 3.4 | 3.7 | 3.2 | 2.8 | 6.2 |
| Suspended substance (mg/L) | 8 | 9 | 6 | 5 | 4 | 14 |
| Ammonia nitrogen (mg/L) | 6.21 | 6.07 | 5.63 | 5.72 | 4.28 | 9.52 |
According to the detection result of the discharged water quality, the removal rate of COD of the wastewater by the enhanced biomembrane treatment process reaches more than 87%, while the removal rate of COD of the comparative example only reaches 75.3%, which indicates that suspended microorganisms in the wastewater flow into the sedimentation tank along with the wastewater and then are precipitated in the sedimentation tank, and the upper layer of activated sludge in the sedimentation tank is not recycled, so that the number of microorganisms in the biomembrane is reduced, and the removal rate of COD is reduced; to continue to increase the COD removal rate, an increase in biofilm is required, leading to an increase in cost.
The present embodiment is only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of which are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. A reinforced biological membrane wastewater treatment process is characterized in that: the method specifically comprises the following steps:
step 1, wastewater pretreatment: introducing wastewater into an ABR reaction tank, introducing the wastewater at the upper layer into a next-stage treatment unit, and discharging sludge at the lower layer into a sludge tank for filter pressing treatment;
step 2, aerobic tank: the pretreated wastewater enters an aerobic tank, a filler is arranged in the aerobic tank, and the aerobic tank is continuously oxygenated;
step 3, a middle sedimentation tank: the wastewater treated by the aerobic tank enters a middle sedimentation tank for sedimentation, the upper layer activated sludge in the middle sedimentation tank flows back to the aerobic tank, and the residual sludge is discharged to a sludge tank for filter pressing treatment;
step 4, a coagulation tank: introducing the wastewater precipitated in the intermediate sedimentation tank into a coagulation tank, adding a pH regulator into the coagulation tank to regulate the pH of the wastewater to 7.5-8.5, and then adding a coagulant aid into the coagulation tank, wherein the adding amount of the coagulant aid is 60-100 ppm;
step 5, a flocculation tank: feeding the wastewater treated in the step 4 into a flocculation tank, and adding a flocculating agent into the flocculation tank, wherein the adding amount of the flocculating agent is 2-4 ppm;
step 6, an inclined tube sedimentation tank: and (5) allowing the wastewater after the flocculation reaction in the step (5) to enter an inclined tube sedimentation tank under the action of gravity, directly discharging supernatant after mud-water separation, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dewatering the sludge by a sludge press after further concentration, and transporting the obtained sludge cake outwards.
2. The enhanced biofilm wastewater treatment process as set forth in claim 1, wherein: in the step 1, a biogas collecting pipeline (1) is arranged above the ABR reaction tank, a plurality of branch pipes (2) are communicated with the biogas collecting pipeline (1), and the branch pipes (2) are respectively communicated with each compartment of the ABR reaction tank.
3. The enhanced biofilm wastewater treatment process as set forth in claim 1, wherein: and in the step 1, the wastewater stays in the ABR reaction tank for 12-60 hours.
4. The enhanced biofilm wastewater treatment process as set forth in claim 1, wherein: the pH regulator in the step 4 is calcium hydroxide.
5. The enhanced biofilm wastewater treatment process as set forth in claim 1, wherein: the coagulant aid in the step 4 at least comprises one of polyaluminium chloride, polyferric chloride and polyaluminium sulfate.
6. The enhanced biofilm wastewater treatment process as set forth in claim 1, wherein: and in the step 5, the flocculating agent at least comprises one of polyacrylamide and sodium polyacrylate.
7. The enhanced biofilm wastewater treatment process as recited in claim 5, wherein: the mass ratio of the polyaluminium chloride to the polyferric chloride to the polyaluminium sulfate is 5: 2: 2.
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