CN113003886A - Water treatment system and method for removing calcium in sewage - Google Patents

Water treatment system and method for removing calcium in sewage Download PDF

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CN113003886A
CN113003886A CN202110286732.1A CN202110286732A CN113003886A CN 113003886 A CN113003886 A CN 113003886A CN 202110286732 A CN202110286732 A CN 202110286732A CN 113003886 A CN113003886 A CN 113003886A
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tank
aerobic
anoxic tank
water
anoxic
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刘志刚
吴德礼
毛云峰
蒯兴宇
戴晓虎
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Tongji University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/62Carbon oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84Biological processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/06Controlling or monitoring parameters in water treatment pH
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/22Eliminating or preventing deposits, scale removal, scale prevention
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00Use of specific compounds during water treatment
    • C02F2305/06Nutrients for stimulating the growth of microorganisms
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/2806Anaerobic processes using solid supports for microorganisms
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
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  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Molecular Biology (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention relates to a water treatment system and a water treatment method for removing calcium in sewage, wherein the system comprises an anoxic tank and an aerobic tank which are sequentially connected, calcium-containing wastewater to be treated is introduced into the anoxic tank, part of treated water of the aerobic tank flows back to the anoxic tank, and aerobic aeration tail gas generated by the aerobic tank is introduced into the anoxic tank to be used as an air source for stirring of the anoxic tank. The invention utilizes the alkalinity generated by oxygen deficiency in the biological treatment process and CO contained in the aerobic aeration tail gas2The method can remove part of calcium ions in water, reduce the influence of the calcium ions in the inlet water on a biological system, and reduce the risk of scaling of pipelines, pumps and the like.

Description

Water treatment system and method for removing calcium in sewage
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a water treatment system and a water treatment method for removing calcium in sewage.
Background
Calcium-containing wastewater with higher concentration, such as toilet wastewater, vegetable dehydration processing wastewater and the like, can generate calcium precipitation phenomena in pipelines, pump impellers and the like when being treated, and the maintenance cost of the system is increased to a certain extent.
Generally, softening processes such as membrane separation methods such as nanofiltration and reverse osmosis, ion exchange methods, and electrodialysis methods are commonly used for removing the calcium ions in the inlet water with low concentration but requiring lower calcium ions in the outlet water, and chemical precipitation methods are mostly used for removing the high-concentration calcium ions. These methods can achieve the desired goal of calcium removal, but the investment and operating costs of the softening process are usually high, while the chemical precipitation method generally requires additional chemical agents and produces a relatively large amount of chemical sludge. For the sewage with higher concentration of calcium ions in inlet water and without specific specified requirements on the calcium ions in outlet water, an easy-to-realize and low-cost calcium removal method is adopted in the biological treatment process2Removing Ca in sewage2+The method of (1).
Disclosure of Invention
The invention aims to solve the problems and provide a method for utilizing alkalinity generated by oxygen deficiency in the conventional biological treatment process and CO contained in aerobic aeration tail gas2A system and method for removing a portion of calcium ions from water.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a remove water treatment system of calcium in sewage, is including the oxygen deficiency pond and the good oxygen pond that connect gradually, let in the calcium-containing waste water of treating in the oxygen deficiency pond, the treated water part of good oxygen pond flows back to the oxygen deficiency pond, the good oxygen aeration tail gas that the good oxygen pond produced is introduced be regarded as in the oxygen deficiency pond the air supply of oxygen deficiency pond stirring.
The invention utilizes the alkalinity generated by oxygen deficiency in the biological treatment process and CO contained in the aerobic aeration tail gas2The influence of calcium ions in the inlet water on biological systems can be reduced by removing part of calcium ions in the inlet waterAnd reduces the risk of scaling of pipes, pumps, etc.
Furthermore, the top of the aerobic tank is provided with a gas collecting hood, the gas collecting hood is connected with the anoxic tank through a ventilation pipeline, and the gas collecting hood can be used for fully collecting aeration tail gas.
Furthermore, an induced draft fan is arranged in the ventilation pipe and used for conveying aeration tail gas from the aerobic tank to the anoxic tank.
Furthermore, the gas collecting hood is made of civil engineering or glass fiber reinforced plastic materials.
Furthermore, CaCO is arranged in the anoxic pond3Precipitating the attached carrier filler.
Further, the carrier filler is soft or combined filler, has larger specific surface area and is easy to collect.
Furthermore, a macroporous perforated pipe is arranged in the anoxic tank, aerobic aeration tail gas generated by the aerobic tank is introduced into the macroporous perforated pipe, and the conventional underwater stirrer can be omitted by adopting the macroporous perforated pipe.
Furthermore, the perforation diameter of the large-hole perforated pipe is 3-10mm, which is not suitable to be too small, so that the influence of too much oxygen on the operation of the anoxic tank is avoided.
Furthermore, the anoxic tank is provided with an anoxic tank inlet pipeline and an anoxic tank outlet pipeline, the aerobic tank is provided with an aerobic tank return pipeline and an aerobic tank outlet pipeline, an internal reflux pump is arranged in the aerobic tank return pipeline, and the aerobic tank is connected with an aeration fan; the calcium-containing wastewater enters the anoxic tank from the anoxic tank inlet pipeline, the anoxic tank effluent enters the aerobic tank from the anoxic tank effluent pipeline, part of the treated water in the aerobic tank flows back to the anoxic tank through the aerobic tank return water pipeline, and the other part of the treated water is delivered to the downstream through the aerobic tank effluent pipeline.
Remove Ca in sewage2+The method for treating water of (1), wherein the above method is used for removing Ca from the sewage2+The water treatment system carries out treatment, and the specific method comprises the following steps: introducing calcium-containing wastewater to be treated into an anoxic tank for anaerobic treatment, introducing the wastewater treated by the anoxic tank into an aerobic tank for aerobic treatment, whereinPart of the treated water in the aerobic tank flows back to the anoxic tank, the aerobic aeration tail gas generated by the aerobic tank is introduced into the anoxic tank to be used as a gas source for stirring in the anoxic tank, and the alkalinity generated by the anoxic and CO contained in the aerobic aeration tail gas are utilized2Removing calcium ions in the water.
According to the aerobic biological aeration system in the existing AO process or AAO process, the invention utilizes the gas-collecting hood to collect the aeration tail gas, and the biological aeration tail gas contains CO through determination2The oxygen content is reduced by more than 10 times (the percentage content is improved from about 0.043 to more than 0.5) compared with the air, and the oxygen content is reduced by more than 10% (the percentage content is reduced from about 20.3 to about 18) compared with the air, so the aerobic aeration tail gas is used as an oxygen-poor pool stirring gas source, the influence of the oxygen in the air on an oxygen-poor system is reduced, and simultaneously the CO in the tail gas is used as a CO stirring gas source2The carbonate ion, which, when combined with water, can act as calcium in the precipitated feed water, is represented by the formula:
Figure BDA0002980774610000031
due to CO2After reaction with water, H is produced+Thereby causing a decrease in pH in the water and adversely affecting Ca2+Thus, the denitrification process using the nitrate nitrogen and the organic matter in the feed water in the system to provide electrons consumes H+Increasing the pH of the anoxic tank, thereby facilitating CaCO3The precipitate formed, as shown in the following formula:
2NO3 -+10e+12H+=N2↑+6H2O
Figure BDA0002980774610000032
the invention utilizes the alkalinity generated by oxygen deficiency in the biological treatment process and CO contained in the aerobic aeration tail gas2The method for removing part of calcium ions in water can reduce the influence of the calcium ions in the inlet water on a biological system and greatly reduce the scaling risk of pipelines, pumps and the like.
Compared with the prior art, the invention has the following advantages:
1. and no chemical agent is needed to be added, and the product of the system can be fully utilized to remove the sediment, so that the sludge production of the system can be effectively reduced.
2. The method is easy to implement, can be modified by means of the deodorization measures of the existing sewage treatment plants, saves the investment of a gas collecting hood and the like, and can reduce the maintenance work intensity by adopting perforated stirring to replace an underwater stirrer.
3. The aerobic reflux ratio can be 200-300% to meet the alkalinity supplement requirement without affecting the denitrification effect of the system.
4. Because the oxygen content in the tail gas is reduced and the air outlet hole with the diameter of 3-10mm is adopted, the stirring intensity in the anoxic tank can be higher than that of the common air, and the stirring intensity is 3-5m3/h·m2The strength ensures that the anoxic tank is mixed more uniformly, and the treatment effect is improved.
5. The method is suitable for treatment scales with different water quantities, basically does not need additional land occupation, and has strong operability.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, a water treatment system for removing calcium from sewage comprises an anoxic tank and an aerobic tank, wherein the anoxic tank is provided with an anoxic tank inlet pipeline and an anoxic tank outlet pipeline, the aerobic tank is provided with an aerobic tank return pipeline and an aerobic tank outlet pipeline, an internal reflux pump is arranged in the aerobic tank return pipeline, and the aerobic tank is connected with an aeration fan;
the top of the aerobic tank is provided with a gas collecting hood, the gas collecting hood is connected with the anoxic tank through a ventilation pipeline, the gas collecting hood can be used for fully collecting aeration tail gas, a draught fan for conveying the aeration tail gas from the aerobic tank to the anoxic tank is arranged in the ventilation pipeline, and the gas collecting hood is made of civil engineering or glass fiber reinforced plastic materials.
CaCO is arranged in the anoxic tank3A carrier filler attached to the precipitate, the carrier filler being softAnd (3) the composite filler has a large specific surface area and is easy to recover. The oxygen-poor tank is internally provided with a macroporous perforated pipe, aerobic aeration tail gas generated by the aerobic tank is introduced into the macroporous perforated pipe, and the conventional underwater stirrer can be omitted by adopting the macroporous perforated pipe. The perforation diameter of the macroporous perforated pipe is 3-10mm, which is not too small, and the influence of too much oxygen on the operation of the anoxic tank is avoided.
Calcium-containing wastewater enters the anoxic tank from an inlet pipeline of the anoxic tank, effluent of the anoxic tank enters the aerobic tank from an outlet pipeline of the anoxic tank, part of treated water in the aerobic tank flows back to the anoxic tank through a return pipeline of the aerobic tank, and the other part of treated water is delivered to the downstream through an outlet pipeline of the aerobic tank.
Removing Ca in sewage2+The water treatment method comprises the steps of introducing calcium-containing wastewater to be treated into an anoxic tank for anaerobic treatment, introducing the wastewater treated by the anoxic tank into an aerobic tank for aerobic treatment, refluxing a part of treated water in the aerobic tank to the anoxic tank, introducing aerobic aeration tail gas generated by the aerobic tank into the anoxic tank to serve as an air source for stirring in the anoxic tank, and utilizing alkalinity generated by anoxic and CO contained in the aerobic aeration tail gas2Removing calcium ions in the water.
The device is particularly applied to a certain vegetable processing wastewater for a small experiment, wherein the volume of an anoxic tank is 20L, the volume of an aerobic tank is 80L, soft filler is added into the anoxic tank, the aperture of a perforated pipe is 4mm, and a gas collecting hood of the aerobic tank is made of organic glass. After 1 month of operation, calcium carbonate precipitates having an average thickness of 1mm were attached to the soft filler.
And tail gas is not utilized for stirring, the conventional AO process or AAO process is adopted for the same operation, more calcium carbonate precipitates are attached to the aeration pipe in the aerobic tank after 1 month, and meanwhile, the sludge MLVSS/MLSS in the aerobic tank is reduced from 65% to about 50%, so that the flocculation property of the sludge is deteriorated, and the activity of the aerobic sludge is influenced.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (10)

1. The utility model provides a remove water treatment system of calcium in sewage, is including the oxygen deficiency pond and the good oxygen pond that connect gradually, its characterized in that, let in the calcium-containing waste water of treating in the oxygen deficiency pond, the treated water part of good oxygen pond flows back to the oxygen deficiency pond, the good oxygen aeration tail gas that the good oxygen pond produced is introduced be regarded as in the oxygen deficiency pond the air supply of oxygen deficiency pond stirring.
2. The water treatment system for removing calcium in sewage as claimed in claim 1, wherein a gas collecting hood is arranged at the top of the aerobic tank, and the gas collecting hood is connected with the anoxic tank through a ventilation pipeline.
3. The water treatment system for removing calcium in sewage according to claim 2, wherein an induced draft fan for sending aeration tail gas from the aerobic tank to the anoxic tank is arranged in the ventilation pipe.
4. The water treatment system for removing calcium in sewage as claimed in claim 2, wherein the gas-collecting hood is made of civil engineering or glass fiber reinforced plastic materials.
5. The system as claimed in claim 1, wherein the anoxic tank is provided with CaCO3Precipitating the attached carrier filler.
6. The system of claim 5, wherein the carrier filler is a soft or combination filler.
7. The water treatment system for removing calcium in sewage as claimed in claim 1, wherein a large-hole perforated pipe is arranged in the anoxic tank, and aerobic aeration tail gas generated by the aerobic tank is introduced into the large-hole perforated pipe.
8. The water treatment system for removing calcium in sewage as recited in claim 7, wherein the perforated diameter of said large-hole perforated pipe is 3-10 mm.
9. The water treatment system for removing calcium in sewage according to any one of claims 1 to 8, wherein the anoxic tank is provided with an anoxic tank inlet pipeline and an anoxic tank outlet pipeline, the aerobic tank is provided with an aerobic tank return pipeline and an aerobic tank outlet pipeline, the aerobic tank return pipeline is provided with an internal reflux pump, and the aerobic tank is connected with an aeration fan;
the calcium-containing wastewater enters the anoxic tank from the anoxic tank inlet pipeline, and the anoxic tank effluent enters the aerobic tank from the anoxic tank effluent pipeline;
and one part of the treated water in the aerobic tank flows back to the anoxic tank through the aerobic tank return water pipeline, and the other part of the treated water is delivered to the downstream through the aerobic tank outlet water pipeline.
10. A water treatment method for removing calcium from sewage, characterized in that the method of claim 9 is used for removing Ca from sewage2+The water treatment system carries out treatment, and the specific method comprises the following steps:
introducing calcium-containing wastewater to be treated into an anoxic tank for anaerobic treatment, introducing the wastewater treated by the anoxic tank into an aerobic tank for aerobic treatment, returning part of the treated water in the aerobic tank to the anoxic tank, introducing aerobic aeration tail gas generated by the aerobic tank into the anoxic tank to serve as an air source for stirring in the anoxic tank, and utilizing alkalinity generated by anoxic and CO contained in the aerobic aeration tail gas2Removing calcium ions in the water.
CN202110286732.1A 2021-03-17 2021-03-17 Water treatment system and method for removing calcium in sewage Pending CN113003886A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115108633A (en) * 2022-06-06 2022-09-27 同济大学建筑设计研究院(集团)有限公司 Multi-way pollution-reducing and carbon-reducing sewage biochemical treatment system and use method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000325981A (en) * 1999-05-21 2000-11-28 Nisshin Steel Co Ltd Biological treatment method of calcium-containing waste water
CN105399287A (en) * 2015-12-30 2016-03-16 北京赛科康仑环保科技有限公司 Hardly-degradable organic wastewater comprehensive treatment and zero discharge treatment method and system thereof
CN205933543U (en) * 2016-08-11 2017-02-08 桂琪 Biochemical treatment device of high calcium, high magnesium waste water
CN111875061A (en) * 2020-08-06 2020-11-03 江苏道同环境科技有限公司 Recycling device and process for high-hardness nitrate wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000325981A (en) * 1999-05-21 2000-11-28 Nisshin Steel Co Ltd Biological treatment method of calcium-containing waste water
CN105399287A (en) * 2015-12-30 2016-03-16 北京赛科康仑环保科技有限公司 Hardly-degradable organic wastewater comprehensive treatment and zero discharge treatment method and system thereof
CN205933543U (en) * 2016-08-11 2017-02-08 桂琪 Biochemical treatment device of high calcium, high magnesium waste water
CN111875061A (en) * 2020-08-06 2020-11-03 江苏道同环境科技有限公司 Recycling device and process for high-hardness nitrate wastewater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115108633A (en) * 2022-06-06 2022-09-27 同济大学建筑设计研究院(集团)有限公司 Multi-way pollution-reducing and carbon-reducing sewage biochemical treatment system and use method thereof
CN115108633B (en) * 2022-06-06 2023-05-16 同济大学建筑设计研究院(集团)有限公司 Multi-way pollution-reducing and carbon-reducing sewage biochemical treatment system and application method thereof

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