CN112093989A - Deep purification system and method for bottom mud treatment tail water - Google Patents

Deep purification system and method for bottom mud treatment tail water Download PDF

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Publication number
CN112093989A
CN112093989A CN202010979861.4A CN202010979861A CN112093989A CN 112093989 A CN112093989 A CN 112093989A CN 202010979861 A CN202010979861 A CN 202010979861A CN 112093989 A CN112093989 A CN 112093989A
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tank
water
filter
sewage
stage
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沈烁
李海峰
康晓蕾
范婉莹
陈畅
白韬光
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Shanghai Hengtuo Industrial Development Co ltd
704th Research Institute of CSIC
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Shanghai Hengtuo Industrial Development Co ltd
704th Research Institute of CSIC
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • 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
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • 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
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • 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
    • C02F1/5281—Installations for water purification using chemical agents
    • 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
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/14—NH3-N
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F2301/04—Flow arrangements
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes

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Abstract

The invention relates to a deep purification system and method for bottom mud treatment tail water, and belongs to the technical field of sewage treatment. Comprises a bottom mud conditioning tank, a plate-and-frame filter pressing unit, a regulating tank, a neutralization tank, a magnetic coagulation tank, a sedimentation tank, an aeration biological filter and a water storage tank which are connected in sequence. The invention is used for collecting and treating the filter-pressing water after the sediment is removed and filter-pressed in lakes and rivers on site through the processes of adding medicine and conditioning to the sediment, filter-pressing and dehydrating, regulating tail water, neutralizing in two stages, performing magnetic coagulation sedimentation, treating in two stages of Biological Aerated Filters (BAF), treating in a water storage tank and the like, efficiently removing suspended matters, organic matters, nutrient substances such as nitrogen, phosphorus and the like in the sewage and purifying the water body. The whole system has the advantages that except for the dehydrated bottom mud obtained after the desilting bottom mud input by the system is dehydrated, a small amount of precipitated mud in the system needs to be further treated, no other pollutants are discharged out of the system, and the zero emission of pollutants is realized; meanwhile, the water resource in the system is recycled and comprehensively utilized, and the water resource is saved.

Description

Deep purification system and method for bottom mud treatment tail water
Technical Field
The invention relates to a deep purification system and method for bottom mud treatment tail water, and belongs to the technical field of sewage treatment.
Background
The deposited bottom mud of lakes and rivers increasingly affects the water quality of the water bodies of lakes and rivers, particularly the bottom mud of lakes and rivers heavily polluted in cities, because the lakes and rivers in the former period receive pollutants for a long time, the deposited bottom mud contains a large amount of pollutants in a releasable state or a soluble state, and under specific conditions, the pollutants in the releasable state or the soluble state can be continuously released to the water bodies of lakes and rivers, so that the ecological environment of the restored and recovered water bodies is influenced or polluted again, and therefore, the treatment of the water body pollution of lakes and rivers is a necessary treatment measure in most cases.
At present, the sediment subjected to desilting in China is dried in the air or in a specific place and then is transported out for treatment, or is dehydrated by conditioning machinery and then is transported out for treatment. However, in any method, a large amount of bottom sludge is filtered out to obtain tail water. In general, some of the tail water is directly discharged back to lakes and rivers without treatment, and some of the tail water enters a sewage treatment plant through nearby nanotubes.
The concentration of pollutants in tail water which is directly discharged back to a river channel without treatment is higher than that of water bodies in lakes and river channels, so that the pollution of the water bodies is aggravated; for tail water discharged into a sewage treatment plant, a large amount of tail water discharged in a short period can affect the water quantity and the water quality of the sewage treatment plant, increase the operation load of the sewage treatment plant and affect the normal and stable operation of the sewage treatment plant.
Therefore, a bottom mud tail water deep purification system is needed, which can collect and treat the bottom mud dredging tail water generated on site, and can directly discharge the treated water back to lakes and rivers after the treated water reaches a certain index, and basically does not pollute the water body.
Disclosure of Invention
The invention aims to solve the technical problem of how to treat tail water generated in the sediment dredging process.
In order to solve the problems, the technical scheme adopted by the invention is to provide a bottom mud treatment tail water deep purification system which comprises a bottom mud conditioning tank, a plate-and-frame filter pressing unit, a regulating tank, a neutralization tank, a magnetic coagulation tank, a sedimentation tank, an aeration biological filter and a water storage tank which are sequentially connected.
Preferably, the neutralization pond comprises a primary neutralization pond and a secondary neutralization pond; and a primary neutralization tank and a secondary neutralization tank are sequentially arranged between the regulating tank and the magnetic coagulation tank.
Preferably, the biological aerated filter comprises a primary biological aerated filter for removing organic matters in sewage and a secondary biological aerated filter for removing ammonia nitrogen in sewage; a first-stage aeration biological filter and a second-stage aeration biological filter which are communicated with each other are arranged between the sedimentation tank and the water storage tank.
Preferably, a pipeline for sludge backflow is arranged between the sedimentation tank and the magnetic coagulation tank.
Preferably, a conveying pipeline for retreatment of the precipitated sludge is arranged between the sedimentation tank and the plate frame filter pressing unit.
Preferably, a pipeline for returning backwash water to the regulating tank is arranged between the biological aerated filter and the regulating tank.
Preferably, a pipeline for backwashing the biological aerated filter is arranged between the water storage tank and the biological aerated filter.
The invention provides a use method of a bottom mud treatment tail water deep purification system, which comprises the following steps:
step 1: adding lime and Polyacrylamide (PAM) into the desilting bottom sludge in a bottom sludge conditioning tank for conditioning, then feeding the desilting bottom sludge into a plate-and-frame filter pressing unit, performing filter pressing by a plate-and-frame filter press in the unit, treating the discharged dewatered sludge additionally, and feeding the discharged tail water into a regulating tank;
step 2: the tail water stays in the regulating tank for a period of time, the regulating tank is provided with stirring, and the tail water is subjected to average value and quantity treatment;
and step 3: the sewage of the adjusting tank sequentially enters a two-stage neutralization tank, and the pH value of the tail water sewage is adjusted to the pH value required by the subsequent process by adding sulfuric acid with different concentrations into the two-stage neutralization tank;
and 4, step 4: the sewage enters a magnetic coagulation tank, and by adding polyaluminium chloride PAC, polyacrylamide PAM and magnetic powder, most suspended substances SS and TP and a small part of COD in the sewage are removed, so that the sewage is primarily purified; precipitates generated in the magnetic coagulation process are precipitated in a precipitation tank;
and 5: the sewage enters a two-stage biological aerated filter BAF, and organic matters in the sewage are removed in the BAF carbonization stage of the first-stage biological aerated filter; removing ammonia nitrogen in the sewage in a BAF nitrification stage of the secondary aeration biological filter;
step 6: the BAF of the secondary biological aerated filter gives out water, the water quality reaches the standard, enters a water storage tank, and is discharged after passing through the water storage tank; meanwhile, the water in the water storage tank can be used for backwashing water of the BAF of the aeration biological filter and system dosing water.
Preferably, part of the sludge generated in the sedimentation tank in the step 4 flows back to the magnetic coagulation tank, so that the utilization rate of the medicament is increased; and partial sludge is discharged and separated from the magnetic powder by a magnetic powder recovery device, the separated magnetic powder is returned to the magnetic coagulation tank for recycling, and the separated sludge is discharged to a plate-frame filter pressing unit and treated with dehydrated bottom mud after dehydration. .
Preferably, a backwashing process is arranged in the two-stage aeration biological filter BAF in the step 5, and backwashing water is discharged back to the regulating tank; and in the step 6, the water storage tank provides backwashing water for the two-stage biological aerated filter BAF.
Compared with the prior art, the invention has the following beneficial effects:
firstly, two-stage neutralization adjustment is arranged, and single one-stage or two-stage simultaneous adjustment operation can be carried out according to the sewage treatment requirement, so that the operation is more reasonable, and the risk of adding concentrated sulfuric acid is reduced;
secondly, the magnetic coagulation sedimentation is provided with a sedimentation tank and adopts sludge backflow, so that the added medicament and magnetic powder are fully utilized, the dosage of the medicament and the magnetic powder can be reduced, and the operation cost is saved;
setting two levels of BAF to separately carry out carbonization reaction and nitration reaction, reducing the influence of heterotrophic bacteria with shorter generation on nitrifying bacteria with longer generation, improving the nitration reaction efficiency and increasing the removal rate of ammonia nitrogen;
and fourthly, two stages of BAF are arranged, and a certain stage can be independently operated according to the requirement of sewage treatment, so that organic matters or ammonia nitrogen are removed, and the operation adjustability is improved.
The whole system is environment-friendly, and has near zero emission of pollutants except that the dewatered bottom sludge (containing a small part of sludge precipitated in the system) obtained after dewatering the dredging bottom sludge input by the system is further treated and disposed and no other pollutants are discharged out of the system; meanwhile, the water resource in the system is recycled and comprehensively utilized, and the water resource is saved.
Drawings
FIG. 1 is a schematic view of a treatment process of an advanced purification system for a bottom mud treatment tail water according to the present invention;
FIG. 2 is a schematic structural diagram of a deep purification system for bottom mud treatment tail water according to the present invention;
reference numerals: 1. a bottom sludge conditioning tank; 2. a plate frame filter pressing unit; 3. a regulating tank; 4. a primary neutralization tank; 5. a secondary neutralization pond; 6. a magnetic coagulation tank; 7. a sedimentation tank; 8. a first-stage aeration biological filter; 9. a second-stage biological aerated filter; 10. a water storage tank; 11. backwashing water; 12. a magnetic powder recovery device;
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:
as shown in the figure 1-2, the invention provides a deep purification system for bottom sludge treatment tail water, which comprises a bottom sludge conditioning tank 1, a plate-frame filter pressing unit 2, a regulating tank 3, a neutralization tank, a magnetic coagulation tank 6, a sedimentation tank 7, an aeration biological filter and a water storage tank 10 which are sequentially connected. The neutralization pond comprises a primary neutralization pond 4 and a secondary neutralization pond 5; a primary neutralization tank 4 and a secondary neutralization tank 5 are sequentially arranged between the adjusting tank 3 and the magnetic coagulation tank 6. The biological aerated filter comprises a primary biological aerated filter 8 for removing organic matters in sewage and a secondary biological aerated filter 9 for removing ammonia nitrogen matters in sewage; a primary biological aerated filter 8 and a secondary biological aerated filter 9 which are communicated with each other are arranged between the sedimentation tank 7 and the water storage tank 10. A pipeline for sludge backflow is arranged between the sedimentation tank 7 and the magnetic coagulation tank 6. A conveying pipeline for retreatment of the precipitated sludge is arranged between the sedimentation tank 7 and the plate frame filter pressing unit 2. A pipeline for returning the backwashing water 11 to the regulating tank 3 is arranged between the biological aerated filter and the regulating tank 3. A pipeline for the backwash water 11 to enter the biological aerated filter is arranged between the water storage tank 10 and the biological aerated filter.
The use method of the deep purification system of the bottom mud treatment tail water comprises the following steps:
step 1: adding lime and Polyacrylamide (PAM) into the desilting bottom sludge in a bottom sludge conditioning tank 1 for conditioning, then feeding the desilting bottom sludge into a plate and frame filter pressing unit 2, carrying out filter pressing on the sludge by a plate and frame filter press in the plate and frame filter pressing unit 2, treating the discharged dewatered sludge additionally, and feeding the discharged tail water into a regulating tank 3;
step 2: the tail water stays in the regulating tank 3 for a period of time, the regulating tank 3 is provided with stirring, and the tail water is subjected to mean value and quantity averaging treatment;
and step 3: the sewage in the adjusting tank 3 sequentially enters a two-stage neutralization tank, and the pH value of the tail water sewage is adjusted to the pH value required by the subsequent process by adding sulfuric acid with different concentrations in the two-stage neutralization tank;
and 4, step 4: the sewage enters a magnetic coagulation tank 6, and by adding polyaluminium chloride PAC, polyacrylamide PAM and magnetic powder, most suspended substances SS and TP and a small part of COD in the sewage are removed, so that the sewage is primarily purified; precipitates generated in the magnetic coagulation process are precipitated in a sedimentation tank 7;
and 5: the sewage enters a two-stage biological aerated filter BAF, and organic matters in the sewage are removed in the carbonization stage of the first-stage biological aerated filter BAF 8; removing ammonia nitrogen in the sewage in a BAF9 nitrification stage of the secondary biological aerated filter;
step 6: the BAF of the secondary biological aerated filter gives out water, the water quality reaches the standard, enters the water storage tank 10, and is discharged after passing through the water storage tank 10; meanwhile, the water in the water storage tank 10 can be used as backwashing water 11 of the BAF of the aeration biological filter and system dispensing water.
Part of the sludge generated in the sedimentation tank 7 in the step 4 flows back to the magnetic coagulation tank 6, so that the utilization rate of the medicament is increased; and partial sludge is discharged and separated from the magnetic powder by a magnetic powder recovery device 12, the separated magnetic powder is returned to the magnetic coagulation tank 6 for recycling, and the separated sludge is discharged to a plate-frame filter pressing unit 2 and treated with dehydrated bottom mud after dehydration.
A backwashing process is arranged in the two-stage biological aerated filter BAF in the step 5, and backwashing water 11 is discharged back to the regulating tank 3; the water storage tank 10 in the step 6 provides backwashing water 11 for the two-stage biological aerated filter BAF.
The invention adopts the following technical scheme:
the method comprises the steps of adding and conditioning bottom sludge, performing plate-and-frame filter pressing, adjusting a tail water adjusting tank, performing two-stage neutralization, performing magnetic coagulation sedimentation, performing two-stage aeration biological filter (BAF) and storing water.
Secondly, adding medicine into the bottom mud, conditioning and performing plate-frame filter pressing, wherein the added conditioning medicine is lime and Polyacrylamide (PAM), and the adding amount is determined according to the characteristics of the actual bottom mud; and a plate-and-frame filter press is adopted for filter pressing.
And the tail water adjusting tank is provided with stirring and is used for collecting the drained water of the plate and frame filter press and adjusting the water quality and the water quantity of the plate and frame filter press within a reasonable time.
And fourthly, two-stage neutralization comprises first-stage neutralization and second-stage neutralization. In the first-stage neutralization, high-concentration sulfuric acid (the concentration is 20% -30% because of the corrosivity of concentrated sulfuric acid) is added, and the pH rough adjustment is carried out on the sewage; and in the second-stage neutralization, low-concentration sulfuric acid (with the concentration of 5% -10%) is added, and the pH of the sewage is finely adjusted or adjusted. Two-stage neutralization, when the required precision of pH is not high in the process of engineering sewage treatment, only one-stage neutralization can be adopted.
Fifthly, the magnetic coagulation sedimentation process comprises magnetic coagulation, a sedimentation tank and magnetic powder recovery. Magnetic coagulation sedimentation, and the retention time is controlled within 20-25 min. Polyaluminium chloride (PAC) is added in the magnetic coagulation process to remove most of SS and TP and a small part of organic matters in the sewage; polyacrylamide (PAM) is added to enhance the flocculation effect; magnetic powder is added to enhance the removal rate of subsequent precipitates; the adding amount of each substance is determined according to actual engineering;
the sedimentation tank can adopt the sedimentation tank of suitable forms such as radial flow formula, vertical flow formula, swash plate (pipe) according to engineering quality of water yield characteristic, and the sedimentation tank sets up the mud backward flow, and with some mud backward flow to magnetism thoughtlessly congeal to increase the utilization ratio of medicament and magnetic, the corresponding quantity that reduces medicament and magnetic.
And (4) magnetic powder recovery, namely separating sludge and magnetic powder in sludge discharged from a sedimentation tank, returning the separated magnetic powder to magnetic coagulation for multiple times of recycling, discharging the sludge to a front-section filter pressing system for dehydration, and finally, treating and disposing the sludge in a dehydrated bottom mud.
Sixthly, the two-stage aeration biological filter (BAF) comprises carbonization BAF and nitrification BAF, wherein the carbonization BAF is mainly used for removing organic matters in the sewage, and the nitrification BAF is mainly used for removing ammonia nitrogen in the sewage. Two stages of BAF, removal of COD and NH3And (4) removing the-N to be separately treated so as to obtain autotrophic nitrifying bacteria with higher concentration and improve the removal rate of ammonia nitrogen. And the two-stage BAF can also independently operate one stage according to the engineering sewage treatment requirement. And two-stage BAF, setting a backwashing process, performing backwashing if necessary, and discharging backwashing water back to the regulating reservoir.
And the water storage tank is used for storing a certain amount of treated standard-reaching discharged water, providing necessary backwashing water for the two-stage BAF process, providing water for system medicament configuration, realizing effective utilization of water resources in the system and saving water resources.
The system and the method of the invention are shown in the flow charts of fig. 1 and fig. 2, and comprise the processes of bottom sludge dosing conditioning and plate-and-frame filter pressing, a tail water adjusting tank, two-stage neutralization, magnetic coagulation sedimentation, two-stage Biological Aerated Filter (BAF), a water storage tank and the like.
Adding lime and PAM into the desilting bottom sludge for conditioning, then feeding the desilting bottom sludge into a plate-and-frame filter press, further treating and disposing the dewatered sludge discharged by the filter press, and feeding the discharged tail water into a regulating tank.
The tail water stays for a period of time in the adjusting tank, the adjusting tank is provided with stirring, and the average value average treatment is carried out on the bottom mud treatment tail water.
And (4) the sewage of the adjusting tank enters a two-stage neutralization treatment process, and the pH value of the tail water sewage is adjusted to the pH value required by the subsequent process by adding sulfuric acid with different concentrations.
The sewage enters a magnetic coagulation sedimentation process, and most SS, TP and a small part of COD in the sewage are removed by adding PAC, PAM and magnetic powder, so that the sewage is preliminarily purified.
Part of sludge generated by the sedimentation tank flows back to the magnetic coagulation, so that the utilization rate of the medicament is increased; and part of the sludge is discharged until magnetic powder is recovered.
Through the magnetic recovery technology, sludge and magnetic powder are separated in a magnetic recovery device, the magnetic powder is returned to the magnetic coagulation and recycling system, the sludge is discharged to a plate-frame filter pressing system, and the sludge is treated and disposed along with dehydrated bottom mud after dehydration.
The sewage enters a two-stage BAF, organic matters in the sewage are removed in a BAF carbonization stage, and ammonia nitrogen in the sewage is removed in a BAF nitrification stage.
The two-stage BAF effluent enters a water storage tank after reaching the standard, and is discharged after passing through the water storage tank, and meanwhile, the water in the water storage tank can be used for BAF backwashing water, system dosing water and the like.
The following is a detailed description with reference to examples.
Examples
The treatment of tail water of the sediment of the dredging of a certain lake in Wuhan with the treatment capacity of 20000m3The sewage is treated by adopting the method, and the main operation process parameters are as follows according to the water quantity and the water quality of the sewage (the water quality of inlet water is shown in a table 1):
two-stage neutralization is adopted, the pH value of the first-stage neutralization is adjusted to 9 from 12, and the pH value of the second-stage neutralization is adjusted to 7.0-8.5; performing magnetic coagulation sedimentation for 24min, wherein the residence time is 80mg/L PAC and 5mg/L PAM, the magnetic powder is started for 20t for the first time, the magnetic powder is consumed for 0.25t every day (namely the recovery rate of a magnetic recovery system is more than or equal to 98%), a high-density sedimentation tank is adopted for sedimentation, and the sludge reflux amount is controlled to be 70-75%; carbonized BAF and nitrated BAF are used simultaneously.
By adopting the invention to treat sewage, the indexes of SS, COD and NH3-N, TP of effluent all reach the first class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB18918-2002) (the effluent quality is shown in Table 1).
TABLE 1 quality of tail water inflow and outflow of dredging sediment in certain lake of Wuhan dynasty
pH SS CODcr NH3-N TP
Unit of Dimensionless mg/L mg/L mg/L mg/L
Quality of inlet water 12.0 80 200 30 2.5
Quality of effluent water 7.4 8 36 2.8 0.34
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides a sediment is handled tail water deep purification system which characterized in that: comprises a bottom mud conditioning tank, a plate-and-frame filter pressing unit, a regulating tank, a neutralization tank, a magnetic coagulation tank, a sedimentation tank, an aeration biological filter and a water storage tank which are connected in sequence.
2. The deep purification system of the bottom mud treatment tail water as set forth in claim 1, characterized in that: the neutralization pond comprises a primary neutralization pond and a secondary neutralization pond; and a primary neutralization tank and a secondary neutralization tank are sequentially arranged between the regulating tank and the magnetic coagulation tank.
3. The deep purification system of the bottom mud treatment tail water according to claim 2, characterized in that: the biological aerated filter comprises a primary biological aerated filter for removing organic matters in sewage and a secondary biological aerated filter for removing ammonia nitrogen matters in the sewage; a first-stage aeration biological filter and a second-stage aeration biological filter which are communicated with each other are arranged between the sedimentation tank and the water storage tank.
4. The deep purification system of the bottom mud treatment tail water according to claim 3, wherein: and a pipeline for sludge backflow is arranged between the sedimentation tank and the magnetic coagulation tank.
5. The deep purification system of the bottom mud treatment tail water as set forth in claim 4, wherein: and a conveying pipeline for retreatment of the precipitated sludge is arranged between the sedimentation tank and the plate frame filter pressing unit.
6. The deep purification system of the bottom mud treatment tail water as set forth in claim 5, wherein: and a pipeline for returning backwash water to the regulating tank is arranged between the biological aerated filter and the regulating tank.
7. The deep purification system of the bottom mud treatment tail water as set forth in claim 6, wherein: and a pipeline for backwashing the biological aerated filter is arranged between the water storage tank and the biological aerated filter.
8. The use method of the deep purification system of the bottom mud treatment tail water is characterized in that: the method comprises the following steps:
step 1: adding lime and Polyacrylamide (PAM) into the desilting bottom sludge in a bottom sludge conditioning tank for conditioning, then feeding the desilting bottom sludge into a plate-and-frame filter pressing unit, carrying out filter pressing on the plate-and-frame filter pressing unit, carrying out treatment on the discharged dewatered sludge, and feeding the discharged tail water into a regulating tank;
step 2: the tail water stays in the regulating tank for a period of time, the regulating tank is provided with stirring, and the tail water is subjected to average value and quantity treatment;
and step 3: the sewage of the adjusting tank sequentially enters a two-stage neutralization tank, and the pH value of the tail water sewage is adjusted to the pH value required by the subsequent process by adding sulfuric acid with different concentrations into the two-stage neutralization tank;
and 4, step 4: the sewage enters a magnetic coagulation tank, and by adding polyaluminium chloride PAC, polyacrylamide PAM and magnetic powder, most suspended substances SS and TP and a small part of COD in the sewage are removed, so that the sewage is primarily purified; precipitates generated in the magnetic coagulation process are precipitated in a precipitation tank;
and 5: the sewage enters a two-stage biological aerated filter BAF, and organic matters in the sewage are removed in the BAF carbonization stage of the first-stage biological aerated filter; removing ammonia nitrogen in the sewage in a BAF nitrification stage of the secondary aeration biological filter;
step 6: the BAF of the secondary biological aerated filter gives out water, the water quality reaches the standard, enters a water storage tank, and is discharged after passing through the water storage tank; meanwhile, the water in the water storage tank can be used for backwashing water of the BAF of the aeration biological filter and system dosing water.
9. The use method of the bottom sediment treatment tail water deep purification system according to claim 8, characterized in that: part of sludge generated in the sedimentation tank in the step 4 flows back to the magnetic coagulation tank, so that the utilization rate of the medicament is increased; and partial sludge is discharged and separated from the magnetic powder by a magnetic powder recovery device, the separated magnetic powder is returned to the magnetic coagulation tank for recycling, and the separated sludge is discharged to a plate-frame filter pressing unit and treated with dehydrated bottom mud after dehydration.
10. The use method of the bottom sediment treatment tail water deep purification system according to claim 8, characterized in that: a backwashing process is arranged in the two-stage biological aerated filter BAF in the step 5, and backwashing water is discharged back to the regulating tank; and in the step 6, the water storage tank provides backwashing water for the two-stage biological aerated filter BAF.
CN202010979861.4A 2020-09-17 2020-09-17 Deep purification system and method for bottom mud treatment tail water Pending CN112093989A (en)

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CN110386689A (en) * 2019-07-09 2019-10-29 中电建水环境治理技术有限公司 Pretreatment system for bed mud residual water treatment equipment
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Application publication date: 20201218