CN113979611A - Sludge high-pressure plate-frame dehydration filter-pressing liquid full-quantification treatment system and treatment method - Google Patents

Sludge high-pressure plate-frame dehydration filter-pressing liquid full-quantification treatment system and treatment method Download PDF

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CN113979611A
CN113979611A CN202111396757.3A CN202111396757A CN113979611A CN 113979611 A CN113979611 A CN 113979611A CN 202111396757 A CN202111396757 A CN 202111396757A CN 113979611 A CN113979611 A CN 113979611A
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unit
sludge
tank
filtrate
pressure plate
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王铸
谭金
李骎
甄胜利
朱倩
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Tianjin High Energy Times Water Treatment Technology Co ltd
Beijing Geoenviron Engineering and Technology Inc
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Tianjin High Energy Times Water Treatment Technology Co ltd
Beijing Geoenviron Engineering and Technology Inc
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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
    • 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
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • 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
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • 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
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • 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
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • 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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents

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  • Engineering & Computer Science (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Water Supply & Treatment (AREA)
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Abstract

The invention discloses a full-quantitative treatment system and a full-quantitative treatment method for sludge high-pressure plate-frame dehydration pressure filtrate, which comprise a sludge treatment unit, a sludge high-pressure plate-frame dehydration unit, a pretreatment softening unit, a coagulating sedimentation unit, a neutralization unit, a denitrification unit, an MBR (membrane bioreactor) membrane and a nanofiltration membrane which are sequentially connected through a pipeline; the sludge treatment unit comprises a sludge modification tank and is provided with a conditioner dosing device; a filtrate outlet of the sludge high-pressure plate-frame dehydration unit is connected with the pretreatment softening unit; the pretreatment softening unit is provided with a sodium carbonate dosing device; the coagulating sedimentation unit and the denitrification unit are both provided with flocculating agent and coagulant aid dosing devices; the concentrated solution outlet of the MBR membrane, the bottom sludge outlet of the coagulating sedimentation unit and the concentrated solution outlet of the nanofiltration membrane are all connected with the sludge modification tank, and filtrate produced by the nanofiltration membrane and filter sludge produced by the sludge high-pressure plate-and-frame dehydration unit are subjected to outward discharge treatment. The invention realizes the full-quantitative treatment of the filter pressing liquid and has higher stability and higher economic benefit.

Description

Sludge high-pressure plate-frame dehydration filter-pressing liquid full-quantification treatment system and treatment method
Technical Field
The invention relates to the technical field of sludge high-pressure plate frame dehydration filter-pressing liquid treatment, in particular to a sludge high-pressure plate frame dehydration filter-pressing liquid full-quantization treatment system and a treatment method.
Background
With the primary improvement of urban sewage treatment rate and the continuous increase of sewage treatment facilities in China, the yield of urban sludge is gradually increased, the wet sludge with the water content of 80% in China is estimated to be not lower than 4500 ten thousand tons every year preliminarily, meanwhile, the sludge treatment in China starts late, a sludge treatment plant constructed early has the phenomenon of 'heavy water and light sludge', a sludge treatment unit is incomplete, and the sludge treatment becomes a difficult problem of urgent need of China.
Aiming at the increasingly serious sludge disposal problem, a large number of sludge treatment projects are implemented domestically. The current mainstream process for sludge treatment comprises the following steps: the method comprises the following steps of high-temperature pyrohydrolysis, anaerobic fermentation, low-temperature drying, sludge dilution conditioning, high-pressure plate frame dehydration, sludge low-temperature drying, incineration, sludge high-temperature compost recycling and the like, wherein the sludge dilution conditioning and the high-pressure plate frame dehydration are increasingly applied to sludge treatment devices in China.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a full-quantitative treatment system and a treatment method for sludge high-pressure plate-frame dehydration filter-pressing liquid.
The invention discloses a sludge high-pressure plate-frame dehydration pressure filtrate full-quantification treatment system, which comprises a sludge treatment unit, a sludge high-pressure plate-frame dehydration unit, a pretreatment softening unit, a coagulating sedimentation unit, a neutralization unit, a denitrification nitrification unit, an MBR (membrane bioreactor) unit and a nanofiltration membrane unit which are sequentially connected through a pipeline;
the sludge treatment unit is used for diluting sludge discharged by a sewage plant, and comprises a sludge storage tank and a sludge modification tank connected with the sludge storage tank, wherein the sludge modification tank is provided with a conditioner dosing device for adding a conditioner;
a filtrate outlet of the sludge high-pressure plate-and-frame dehydration unit is connected with the pretreatment softening unit through a pipeline; the pretreatment softening unit is provided with a sodium carbonate dosing device for adding sodium carbonate to the pretreatment softening unit and removing high-concentration calcium ions in the press filtrate;
the coagulating sedimentation unit and the denitrification unit are respectively provided with a flocculating agent dosing device and a coagulant aid dosing device which are respectively used for adding flocculating agent and coagulant aid to the coagulating sedimentation unit and the denitrification unit;
the concentrated solution outlet of the MBR membrane unit, the sludge outlet at the bottom of the coagulating sedimentation unit and the concentrated solution outlet of the nanofiltration membrane unit are all connected with the sludge modification tank through pipelines, and filtrate produced by the nanofiltration membrane unit and filter sludge produced by the sludge high-pressure plate frame dehydration unit are subjected to outward discharge treatment.
As a further refinement of the invention, the conditioning agent comprises one or more of a dilute solution, lime and a polymeric ferric sulphate.
As a further improvement of the invention, the coagulating sedimentation unit comprises an inclined plate sedimentation tank, the inclined plate sedimentation tank is provided with the flocculating agent dosing device and the coagulant aid dosing device, and the inclined plate sedimentation tank is used for carrying out mud-water separation on the produced water of the pretreatment softening unit.
As a further improvement of the invention, the neutralization unit comprises a neutralization pond and a sulfuric acid or hydrochloric acid adding device, and the neutralization unit adjusts the pH value of the produced water of the coagulating sedimentation unit by adding sulfuric acid or hydrochloric acid;
the pH value is 6.5-8.0.
As a further improvement of the invention, the denitrification unit comprises a denitrification tank and a nitrification tank, wherein an inlet of the denitrification tank is connected with an outlet of the neutralization tank through a pipeline, an outlet of the denitrification tank is connected with the nitrification tank, and the nitrification tank is provided with a flocculating agent dosing device and a coagulant aid dosing device;
the denitrification tank utilizes denitrifying bacteria to remove COD and NO in the water produced by the neutralization tank3N, the nitrification tank is used for removing COD and NO in the water produced by the denitrification tank3-N and phosphate.
As a further improvement of the invention, the denitrification unit further comprises a phosphorus removing agent feeding device which respectively provides phosphorus removing agents for the denitrification tank and the nitrification tank.
As a further improvement of the invention, the flocculant comprises PAC and PFS and the coagulant aid comprises PAM.
As a further improvement of the invention, the MBR membrane unit comprises one or more of a tubular ultrafiltration membrane, a hollow fiber MBR membrane and a plate MBR membrane, a concentrated solution outlet of the MBR membrane is connected with the sludge modification tank through a pipeline, and a filtrate outlet of the MBR membrane is connected with an inlet of the nanofiltration membrane unit through a pipeline;
COD in the filtrate produced by the MBR membrane is not more than 500mg/L, NH3 is not more than 5mg/L, and TP is not more than 3 mg/L.
As a further improvement of the invention, the nanofiltration membrane unit comprises one or more of a first-stage one-stage nanofiltration membrane, a first-stage two-stage nanofiltration membrane, a first-stage three-stage nanofiltration membrane and a second-stage nanofiltration membrane, the molecular weight of the intercepted organic matters of the nanofiltration membranes is not lower than 500Da, and the rejection rate of orthophosphate is not lower than 98%;
and a concentrated solution outlet of the nanofiltration membrane is connected with the sludge modification tank through a pipeline, and filtrate produced by a filtrate outlet of the nanofiltration membrane is subjected to discharge treatment.
As a further improvement of the invention, the sludge high-pressure plate-frame dewatering device further comprises a pressure filtrate adjusting tank for balancing water quality and water quantity, wherein an inlet of the pressure filtrate adjusting tank is connected with a pressure filtrate outlet of the sludge high-pressure plate-frame dewatering unit, and an outlet of the pressure filtrate adjusting tank is connected with the pretreatment softening unit.
The invention also discloses a treatment method of the sludge high-pressure plate frame dehydration filtrate full-quantization treatment system, which comprises the following steps:
1) dewatering the residual sludge to the water content of below 80% in a sewage plant, and sending the residual sludge into a sludge storage pool;
2) lifting the sludge in the sludge storage tank to a sludge modification tank by a pump, adding lime and polymeric ferric sulfate into the sludge modification tank, adding dilution water, sludge generated in a sewage treatment system and nanofiltration concentrate, and diluting and conditioning the sludge to the water content of 92-95%;
3) after the sludge with the water content of 92-95% after modification is lifted by a pump, the sludge is sent into a sludge high-pressure plate frame dehydration unit, and after the sludge is dehydrated by the sludge high-pressure plate frame dehydration unit, the water content of the sludge is reduced to 50% -55%, and then the sludge is transported out;
4) the press filtrate of the sludge high-pressure plate frame dehydration unit is conveyed to a press filtrate regulating tank through a pipeline for temporary storage and then is sent into a pretreatment softening unit, and the calcium ion concentration of the press filtrate is reduced to be within 100mg/L from 2000mg/L by adding sodium carbonate into the pretreatment softening unit;
5) the pressure filtrate treated by the pretreatment softening unit flows into a coagulating sedimentation unit by gravity, and most of suspended matters in the pressure filtrate are removed by adding flocculating agents PAC and PFS and a coagulant aid PAM into the coagulating sedimentation unit;
6) the sludge at the bottom of the coagulating sedimentation unit flows back to the sludge modification tank through a pipeline for dilution modification, and is transported out together with the sludge modification tank after being dehydrated, the pH value of the effluent of the coagulating sedimentation unit is adjusted through the neutralization unit, and the pH value is adjusted to 6.5-8 by adding concentrated sulfuric acid or hydrochloric acid into the neutralization unit and then is transported to the denitrification tank;
7) removing influent TN by denitrifying bacteria in a denitrification tank, enabling effluent of the denitrification tank to flow to a nitrification tank, adding flocculating agents PAC and PFS and a coagulant aid PAM into the nitrification tank, and removing COD, NH3, TN and TP pollutants in the influent by aeration and utilizing the biological metabolism of aerobic microorganisms;
8) the produced water treated by the nitrification tank is sent to an MBR membrane unit, and SS in the produced water is further removed by the MBR membrane unit; concentrated solution of the MBR membrane unit flows back to the sludge modification tank through a pipeline, and filtrate enters the nanofiltration membrane unit through the pipeline;
9) concentrated solution which is generated at a concentrated solution outlet of the nanofiltration membrane unit and is enriched with a large amount of refractory organic matters, NH3, TP, Ca, Mg and SO4 pollutants reflows to the sludge modification tank through a pipeline, and calcium sulfate, magnesium hydroxide and calcium carbonate precipitates are formed by adding a lime conditioner into the sludge modification tank, SO that full-quantitative treatment of the nanofiltration concentrated solution is realized; and a filtrate outlet of the nanofiltration membrane unit is treated by discharging.
As a further improvement of the invention, the reaction time of the denitrification tank is not less than 48h, and the reaction time of the nitrification tank is not less than 96 h.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the sludge treatment unit, the sludge high-pressure plate frame dehydration unit, the pretreatment softening unit, the coagulating sedimentation unit, the neutralization unit, the denitrification unit, the MBR membrane unit and the nanofiltration membrane unit are arranged, so that the full-quantitative treatment of the sludge high-pressure plate frame pressure filtrate is realized, and the device has higher stability, high efficiency and higher economic benefit, and has very wide market application prospect in the future;
according to the invention, the concentrated solution outlet of the MBR membrane unit, the bottom sludge outlet of the coagulative precipitation unit and the concentrated solution outlet of the nanofiltration membrane unit are connected with the sludge modification tank through pipelines, so that secondary modification conditioning of the concentrated solution and the residual sludge is realized, the blockage of the membrane system caused by scaling of the pipeline is effectively avoided, and the treatment efficiency of sludge high-pressure plate frame dehydration filter press liquid is improved.
Drawings
FIG. 1 is a pipeline connection diagram of a sludge high-pressure plate-frame dehydration press filtrate full-quantization treatment system disclosed by the invention;
FIG. 2 is a flow chart of a treatment method of a sludge high-pressure plate-frame dehydration pressure filtrate full-quantization treatment system disclosed by the invention.
In the figure:
1. a mud storage pool; 2. a sludge modification tank; 3. a modified sludge storage tank; 4. a sludge high-pressure plate frame dehydration unit; 5. pressing a filtrate adjusting tank; 6. a pretreatment softening unit; 7. a coagulating sedimentation unit; 8. a neutralization unit; 9. a denitrification tank; 10. a nitrification tank; 11. an MBR membrane unit; 12. a nanofiltration membrane unit; 13. a sodium carbonate dosing device; 14. a flocculating agent dosing device; 15. a coagulant aid dosing device; 16. a conditioner dosing device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the attached drawing figures:
the invention discloses a sludge high-pressure plate-frame dehydration pressure filtrate full-quantification treatment system, which comprises a sludge treatment unit, a sludge high-pressure plate-frame dehydration unit 4, a pretreatment softening unit 6, a coagulating sedimentation unit 7, a neutralization unit 8, a denitrification unit, an MBR (membrane bioreactor) unit 11 and a nanofiltration membrane unit 12 which are sequentially connected through a pipeline; the sludge treatment unit is used for diluting sludge discharged by a sewage plant, and comprises a sludge storage tank 1 and a sludge modification tank 2 connected with the sludge storage tank 1, and the sludge modification tank 2 is provided with a conditioner dosing device 16 for adding a conditioner; the filter pressing liquid outlet of the sludge high-pressure plate frame dehydration unit 4 is connected with the pretreatment softening unit 6 through a pipeline; the pretreatment softening unit 6 is provided with a sodium carbonate dosing device 13 for adding sodium carbonate to the pretreatment softening unit 6 and removing high-concentration calcium ions in the press filtrate; the coagulating sedimentation unit 7 and the denitrification unit are both provided with a flocculating agent dosing device 14 and a coagulant aid dosing device 15 which are respectively used for adding flocculating agent and coagulant aid to the coagulating sedimentation unit 7 and the denitrification unit; the concentrated solution outlet of the MBR membrane unit 11, the sludge outlet at the bottom of the coagulative precipitation unit 7 and the concentrated solution outlet of the nanofiltration membrane unit 12 are all connected with the sludge modification tank 2 through pipelines, and the filtrate produced by the nanofiltration membrane unit 12 and the sludge produced by the sludge high-pressure plate-frame dehydration unit 4 are discharged for treatment.
According to the invention, the sludge treatment unit, the sludge high-pressure plate frame dehydration unit 4, the pretreatment softening unit 6, the coagulating sedimentation unit 7, the neutralization unit 8, the denitrification unit, the MBR membrane unit 11 and the nanofiltration membrane unit 12 are arranged, so that the full-quantitative treatment of the sludge high-pressure plate frame pressure filtrate is realized, the stability, the efficiency and the economic benefit are higher, and the wide market application prospect is provided in the future; the concentrated solution outlet of the MBR membrane unit 11, the bottom sludge outlet of the coagulative precipitation unit 7 and the concentrated solution outlet of the nanofiltration membrane unit 12 are all connected with the sludge modification tank 2 through pipelines, so that secondary modification conditioning of the concentrated solution and the residual sludge is realized, the blockage of the membrane system caused by scaling of the pipelines is effectively avoided, and the treatment efficiency of sludge high-pressure plate frame filter pressing liquid is improved.
Specifically, the method comprises the following steps:
as shown in figure 1, the inlet end of the sludge modification tank 2 is connected with the outlet end of the sludge storage tank 1 through a pipeline, the inlet end of the sludge storage tank 1 is connected with a sludge outlet discharged by a sewage plant, and the sludge input from the inlet end of the sludge storage tank 1 is sludge dehydrated to be below 80%.
Further, the conditioner comprises one or more of a diluent, lime and polyferric sulfate are selected, and the polyferric sulfate cannot be practically polymerized into ferric chloride, the lime is added into the sludge modification tank 2 through a lime bin and a lime conveying pipeline, the polyferric sulfate is conveyed to the sludge modification tank 2 through a pipeline, a stirrer used for stirring the conditioner and dewatered sludge is further arranged in the sludge modification tank 2, and the conditioner is used for diluting and conditioning the sludge in the sludge modification tank 2 to adjust the water content of the sludge in the sludge modification tank 2 to 92% -95%.
Further, an outlet of the sludge modification tank 2 is connected with the modified sludge storage tank 3 through a pipeline, the modified sludge storage tank 3 is used for storing sludge diluted and modified by the sludge modification tank 2, diluted sludge in the modified sludge storage tank 3 is pumped into the sludge high-pressure plate-and-frame dehydration unit 4 through a high-pressure plunger pump, the water content of the sludge is reduced to 50-55% through the sludge high-pressure plate-and-frame dehydration unit 4 and then the sludge is fed into a landfill for harmless landfill, and the sludge high-pressure plate-and-frame dehydration unit 4 is preferably a high-pressure plate-and-frame filter press.
Further, the pretreatment softening unit 6 is provided with a sodium carbonate dosing device 13, the pretreatment softening unit 6 is preferably softened by sodium carbonate without adding lime or sodium hydroxide for softening, a stirrer for stirring the pressure filtrate and the sodium carbonate is further arranged in the pretreatment softening unit 6, so that the pressure filtrate and the sodium carbonate are fully mixed, high-concentration calcium ions in the pressure filtrate are removed, the concentration of the calcium ions in the pressure filtrate is reduced to be within 100mg/L from 2000mg/L, and the pipeline structure blockage caused by overhigh concentration of the calcium ions in the pressure filtrate is avoided.
Furthermore, the coagulating sedimentation unit 7 is provided with a flocculating agent dosing device 14 and a coagulant aid dosing device 15 for adding a flocculating agent and a coagulant aid to the coagulating sedimentation unit 7, the coagulating sedimentation unit 7 is used for carrying out mud-water separation on the produced water of the pretreatment softening unit 6, the coagulating sedimentation unit 7 is preferably an inclined plate sedimentation tank, the flocculating agent comprises PAC and PFS, and the coagulant aid comprises PAM. The setting of inclined plate sedimentation tank has reduced area, has improved precipitation efficiency, through adding PAC and PFS flocculating agent and PAM coagulant aid, has guaranteed that inclined plate sedimentation tank goes out water SS concentration and can reduce to within 200mg/L, and the mud outlet of inclined plate sedimentation tank bottom passes through the pipeline and is connected with mud modified pond 2, realizes the dilution of inclined plate sedimentation tank bottom mud and takes care of, and the delivery port of inclined plate sedimentation tank passes through the pipeline and is connected with neutralization unit 8.
Further, the neutralization unit 8 comprises a neutralization pond and a sulfuric acid or hydrochloric acid adding device, the neutralization unit 8 adjusts the pH value of the produced water of the coagulation precipitation unit 7 by adding concentrated sulfuric acid or hydrochloric acid, the pH value of the neutralization unit 8 is 6.5-8.0, the pH value of the produced water of the coagulation precipitation unit 7 is adjusted to 6.5-8.0 by adding concentrated sulfuric acid or hydrochloric acid, and the diluted conditioned water flows into the denitrification unit by gravity.
Further, the denitrification unit comprises a denitrification tank 9 and a nitrification tank 10, wherein an inlet of the denitrification tank 9 is connected with an outlet of the neutralization tank through a pipeline, an outlet of the denitrification tank 9 is connected with the nitrification tank 10, and the nitrification tank 10 is provided with a flocculating agent dosing device 14 and a coagulant aid dosing device 15; the denitrification tank 9 utilizes the influent COD to reduce the influent NO3-N into N by denitrifying bacteria2Discharged into the air to realize the removal of inlet water TN and further remove COD and TN in the produced water of the neutralization tank, and the nitrification tank 10 utilizes aerobic microorganisms through aerationBiological metabolism of the matter, removal of COD and NH in the influent water3And TN, TP and the like, wherein PAC and PFS are preferred as the flocculating agent, and PAM is preferred as the coagulant aid.
Further, the denitrification unit also comprises a phosphorus removal agent feeding device which respectively provides phosphorus removal agents for the denitrification tank 9 and the nitrification tank 10 so as to remove orthophosphate in the produced water and reduce the orthophosphate in the produced water to below 3 mg/L.
Furthermore, the denitrification unit can be provided with a single-stage denitrification unit or a two-stage denitrification unit, wherein the residence time of the first-stage denitrification unit is usually not less than 48h, and the residence time of the first-stage nitrification tank water is usually not less than 96 h. The sludge concentration of the nitrification tank 10 is usually not lower than 6g/L and not higher than 40 g/L.
Furthermore, effluent of the nitrification tank 10 enters an MBR (membrane bioreactor) membrane unit 11, a concentrated solution outlet of the MBR membrane unit 11 is connected with the sludge modification tank 2 through a pipeline, a filtrate outlet of the MBR membrane unit 11 is connected with an inlet of the nanofiltration membrane unit 12 through a pipeline, COD (chemical oxygen demand) in filtrate produced by the MBR membrane unit 11 is not more than 500mg/L, NH3 (NH 3) is not more than 5mg/L, and TP (total phosphorus content) is not more than 3 mg/L.
Further, the suspended matter concentration in the MBR membrane unit 11 of the present invention is usually not lower than 6g/L, and when a tubular ultrafiltration membrane is used, the suspended matter concentration is not higher than 40 g/L.
Furthermore, the nanofiltration membrane unit 12 comprises one or more of a first-stage one-stage two-stage nanofiltration membrane, a first-stage three-stage nanofiltration membrane and a second-stage nanofiltration membrane, the molecular weight of the intercepted organic matters of the nanofiltration membranes is not lower than 500Da, and the rejection rate of orthophosphate is not lower than 98%; the concentrated solution outlet of the nanofiltration membrane is connected with the sludge modification tank 2 through a pipeline, and the filtrate produced at the filtrate outlet of the nanofiltration membrane is discharged for treatment. The nanofiltration membrane unit 12 of the invention can not use a reverse osmosis membrane system, thereby avoiding inorganic salt accumulation caused by throttling monovalent salt. 10-15% of membrane concentrated solution generated by the nanofiltration membrane unit 12 is sent into the sludge modification tank 2, reacts with diluting conditioners such as lime and the like to form precipitates such as calcium sulfate, calcium carbonate, magnesium hydroxide and the like, and a large amount of trapped divalent salts such as COD, NH3, TN, TP, calcium magnesium, sulfate radicals and the like in the concentrated solution are removed, so that accumulation of divalent salts is avoided, and full-quantitative treatment of sludge press filtrate is realized.
Furthermore, the invention also comprises a pressure filtrate adjusting tank 5 for balancing water quality and water quantity, wherein the inlet of the pressure filtrate adjusting tank 5 is connected with the pressure filtrate outlet of the sludge high-pressure plate frame dehydration unit 4, and the outlet of the pressure filtrate adjusting tank 5 is connected with the pretreatment softening unit 6.
As shown in fig. 2, the invention also discloses a full-quantization treatment method of sludge high-pressure plate-frame dehydration filter-press liquid, which comprises the following steps:
1) dewatering the residual sludge to the water content of below 80% in the sewage plant, and sending the residual sludge into a sludge storage tank 1;
2) lifting the sludge in the sludge storage tank 1 to a sludge modification tank 2 through a pump, adding lime and polyferric sulfate into the sludge modification tank 2, adding dilution water, sludge generated in a sewage treatment system and nanofiltration concentrate, and diluting and conditioning until the water content is 92-95%;
3) after the sludge with the water content of 92-95% after modification is lifted by a pump, the sludge is sent into a sludge high-pressure plate frame dehydration unit 4, and after the sludge is dehydrated by the sludge high-pressure plate frame dehydration unit 4, the water content of the sludge is reduced to 50% -55%, and then the sludge is transported out;
4) the press filtrate of the sludge high-pressure plate frame dehydration unit 4 is conveyed to a press filtrate regulating tank 5 through a pipeline for temporary storage and then is conveyed to a pretreatment softening unit 6, and the calcium ion concentration of the press filtrate is reduced to be within 100mg/L from 2000mg/L by adding sodium carbonate into the pretreatment softening unit 6;
5) the pressure filtrate treated by the pretreatment softening unit 6 flows into a coagulating sedimentation unit 7 by gravity, and most of suspended matters in the pressure filtrate are removed by adding flocculating agents PAC and PFS and a coagulant aid PAM to the coagulating sedimentation unit 7;
6) the sludge at the bottom of the coagulating sedimentation unit 7 flows back to the sludge modification tank 2 through a pipeline for dilution modification, the sludge is transported out after being dehydrated, the pH value of the effluent of the coagulating sedimentation unit 7 is adjusted through the neutralization unit 8, the pH value is adjusted to 6.5-8 by adding concentrated sulfuric acid or hydrochloric acid into the neutralization unit 8, and then the effluent is transported to the denitrification tank 9;
7) the denitrification tank 9 realizes the removal of water inlet TN through denitrifying bacteria, the water outlet of the denitrification tank 9 flows to the nitrification tank 10, flocculants PAC and PFS are added into the nitrification tank 10, a coagulant aid PAM is added, and the biological metabolism of aerobic microorganisms is utilized through aeration to remove COD and NH in the water inlet3TN, TP and the like;
8) the produced water treated by the nitrification tank 10 is sent to an MBR (membrane bioreactor) membrane unit 11, and SS (suspended substances) and other organic matters in the produced water are further removed by the MBR membrane unit 11; concentrated solution of the MBR membrane unit 11 flows back to the sludge modification tank 2 through a pipeline, and filtrate enters the nanofiltration membrane unit 12 through a pipeline;
9) the concentrated solution outlet of the nanofiltration membrane unit 12 is enriched with a large amount of refractory organic matters and NH3、TP、Ca、Mg、SO4The concentrated solution of the pollutants reflows to the sludge modification tank 2 through a pipeline, and a lime conditioner is added into the sludge modification tank 2 to form forms of calcium sulfate, magnesium hydroxide, calcium carbonate precipitation and the like, so that the full-quantitative treatment of the nanofiltration concentrated solution is realized; the filtrate outlet of the nanofiltration membrane unit 12 is treated by discharging.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A sludge high-pressure plate-frame dehydration pressure filtrate full-quantification treatment system is characterized by comprising a sludge treatment unit, a sludge high-pressure plate-frame dehydration unit, a pretreatment softening unit, a coagulating sedimentation unit, a neutralization unit, a denitrification nitrification unit, an MBR membrane unit and a nanofiltration membrane unit which are sequentially connected through a pipeline;
the sludge treatment unit is used for diluting sludge discharged by a sewage plant, and comprises a sludge storage tank and a sludge modification tank connected with the sludge storage tank, wherein the sludge modification tank is provided with a conditioner dosing device for adding a conditioner;
a filtrate outlet of the sludge high-pressure plate-and-frame dehydration unit is connected with the pretreatment softening unit through a pipeline; the pretreatment softening unit is provided with a sodium carbonate dosing device for adding sodium carbonate to the pretreatment softening unit and removing high-concentration calcium ions in the press filtrate;
the coagulating sedimentation unit and the denitrification unit are respectively provided with a flocculating agent dosing device and a coagulant aid dosing device which are respectively used for adding flocculating agent and coagulant aid to the coagulating sedimentation unit and the denitrification unit;
the concentrated solution outlet of the MBR membrane unit, the sludge outlet at the bottom of the coagulating sedimentation unit and the concentrated solution outlet of the nanofiltration membrane unit are all connected with the sludge modification tank through pipelines, and filtrate produced by the nanofiltration membrane unit and filter sludge produced by the sludge high-pressure plate frame dehydration unit are subjected to outward discharge treatment.
2. The sludge high-pressure plate frame dewatering filter-press liquid full-quantification treatment system according to claim 1, wherein the conditioner comprises one or more of a dilution solution, lime and polymeric ferric sulfate.
3. The system for fully processing sludge high-pressure plate-and-frame dehydration and pressure filtration liquid according to claim 1, wherein the coagulating sedimentation unit comprises an inclined plate sedimentation tank, the inclined plate sedimentation tank is provided with the flocculating agent dosing device and the coagulant aid dosing device, and the inclined plate sedimentation tank is used for carrying out mud-water separation on the produced water of the pretreatment softening unit.
4. The system for fully treating the sludge high-pressure plate frame dehydration pressure filtrate according to claim 3, characterized in that the neutralization unit comprises a neutralization pond and a sulfuric acid or hydrochloric acid adding device, and the neutralization unit adjusts the pH value of the produced water of the coagulating sedimentation unit by adding sulfuric acid or hydrochloric acid;
the pH value is 6.5-8.0.
5. The system for fully treating sludge high-pressure plate-and-frame dehydration pressure filtrate according to claim 4, wherein the denitrification unit comprises a denitrification tank and a nitrification tank, wherein an inlet of the denitrification tank is connected with an outlet of the neutralization tank through a pipeline, an outlet of the denitrification tank is connected with the nitrification tank, and the nitrification tank is provided with the flocculant dosing device and the coagulant aid dosing device;
the denitrification tank utilizes denitrifying bacteria to remove COD and NO in the water produced by the neutralization tank3N, the nitrification tank is used for removing COD and NO in the water produced by the denitrification tank3-N and phosphate;
the flocculant comprises PAC and PFS and the coagulant aid comprises PAM.
6. The system for fully treating sludge high-pressure plate-and-frame dehydration pressure filtrate according to claim 5, wherein the denitrification unit further comprises a phosphorus removal agent feeding device, and the phosphorus removal agent feeding device respectively provides phosphorus removal agents for the denitrification tank and the nitrification tank.
7. The system for the full-scale treatment of the sludge high-pressure plate-and-frame dehydration pressure filtrate according to claim 1, wherein the MBR membrane unit comprises one or more of a tubular ultrafiltration membrane, a hollow fiber MBR membrane and a plate MBR membrane, a concentrated solution outlet of the MBR membrane is connected with the sludge modification tank through a pipeline, and a filtrate outlet of the MBR membrane is connected with an inlet of the nanofiltration membrane unit through a pipeline;
COD in the filtrate produced by the MBR membrane is not more than 500mg/L, NH3 is not more than 5mg/L, and TP is not more than 3 mg/L.
8. The sludge high-pressure plate-and-frame dehydration pressure filtrate full-quantization treatment system according to claim 1, wherein the nanofiltration membrane unit comprises one or more of a first-stage one-stage nanofiltration membrane, a first-stage two-stage nanofiltration membrane, a first-stage three-stage nanofiltration membrane and a second-stage nanofiltration membrane, the molecular weight of organic matters intercepted by the nanofiltration membrane is not lower than 500Da, and the rejection rate of orthophosphate is not lower than 98%;
and a concentrated solution outlet of the nanofiltration membrane is connected with the sludge modification tank through a pipeline, and filtrate produced by a filtrate outlet of the nanofiltration membrane is subjected to discharge treatment.
9. The treatment method of the sludge high-pressure plate-and-frame dehydration pressure filtrate full-quantitative treatment system of claim 1, comprising the following steps
1) Dewatering the residual sludge to the water content of below 80% in a sewage plant, and sending the residual sludge into a sludge storage pool;
2) lifting the sludge in the sludge storage tank to a sludge modification tank by a pump, adding lime and polymeric ferric sulfate into the sludge modification tank, adding dilution water, sludge generated in a sewage treatment system and nanofiltration concentrate, and diluting and conditioning the sludge to the water content of 92-95%;
3) after the sludge with the water content of 92-95% after modification is lifted by a pump, the sludge is sent into a sludge high-pressure plate frame dehydration unit, and after the sludge is dehydrated by the sludge high-pressure plate frame dehydration unit, the water content of the sludge is reduced to 50% -55%, and then the sludge is transported out;
4) the press filtrate of the sludge high-pressure plate frame dehydration unit is conveyed to a press filtrate regulating tank through a pipeline for temporary storage and then is sent into a pretreatment softening unit, and the calcium ion concentration of the press filtrate is reduced to be within 100mg/L from 2000mg/L by adding sodium carbonate into the pretreatment softening unit;
5) the pressure filtrate treated by the pretreatment softening unit flows into a coagulating sedimentation unit by gravity, and most of suspended matters in the pressure filtrate are removed by adding flocculating agents PAC and PFS and a coagulant aid PAM into the coagulating sedimentation unit;
6) the sludge at the bottom of the coagulating sedimentation unit flows back to the sludge modification tank through a pipeline for dilution modification, and is transported out together with the sludge modification tank after being dehydrated, the pH value of the effluent of the coagulating sedimentation unit is adjusted through the neutralization unit, and the pH value is adjusted to 6.5-8 by adding concentrated sulfuric acid or hydrochloric acid into the neutralization unit and then is transported to the denitrification tank;
7) removing influent TN by denitrifying bacteria in a denitrification tank, enabling effluent of the denitrification tank to flow to a nitrification tank, adding flocculating agents PAC and PFS and a coagulant aid PAM into the nitrification tank, and removing COD, NH3, TN and TP pollutants in the influent by aeration and utilizing the biological metabolism of aerobic microorganisms;
8) the produced water treated by the nitrification tank is sent to an MBR membrane unit, and SS in the produced water is further removed by the MBR membrane unit; concentrated solution of the MBR membrane unit flows back to the sludge modification tank through a pipeline, and filtrate enters the nanofiltration membrane unit through the pipeline;
9) concentrated solution which is generated at a concentrated solution outlet of the nanofiltration membrane unit and is enriched with a large amount of refractory organic matters, NH3, TP, Ca, Mg and SO4 pollutants reflows to the sludge modification tank through a pipeline, and calcium sulfate, magnesium hydroxide and calcium carbonate precipitates are formed by adding a lime conditioner into the sludge modification tank, SO that full-quantitative treatment of the nanofiltration concentrated solution is realized; and a filtrate outlet of the nanofiltration membrane unit is treated by discharging.
10. The treatment method as claimed in claim 9, wherein the reaction time of the denitrification tank is not less than 48h, and the reaction time of the nitrification tank is not less than 96 h.
CN202111396757.3A 2021-11-23 2021-11-23 Sludge high-pressure plate-frame dehydration filter-pressing liquid full-quantification treatment system and treatment method Pending CN113979611A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110183066A (en) * 2019-07-05 2019-08-30 无锡市政设计研究院有限公司 Cyanobacteria deep dehydration waste water treatment system and technique
CN117509945A (en) * 2023-10-30 2024-02-06 中交(苏州)城市开发建设有限公司 Equipment platform for dredging, conditioning, filter pressing and residual water treatment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110183066A (en) * 2019-07-05 2019-08-30 无锡市政设计研究院有限公司 Cyanobacteria deep dehydration waste water treatment system and technique
CN110183066B (en) * 2019-07-05 2023-07-07 华昕设计集团有限公司 Blue algae deep dehydration wastewater treatment system and process
CN117509945A (en) * 2023-10-30 2024-02-06 中交(苏州)城市开发建设有限公司 Equipment platform for dredging, conditioning, filter pressing and residual water treatment

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