WO2019153584A1 - Dispositif et procédé de traitement avancé des eaux usées - Google Patents

Dispositif et procédé de traitement avancé des eaux usées Download PDF

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Publication number
WO2019153584A1
WO2019153584A1 PCT/CN2018/088770 CN2018088770W WO2019153584A1 WO 2019153584 A1 WO2019153584 A1 WO 2019153584A1 CN 2018088770 W CN2018088770 W CN 2018088770W WO 2019153584 A1 WO2019153584 A1 WO 2019153584A1
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Prior art keywords
membrane
sewage
microalgae
reaction tank
tank
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PCT/CN2018/088770
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English (en)
Chinese (zh)
Inventor
陶益
周灿炜
陈光耀
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Shenzhen Graduate School Tsinghua University
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Shenzhen Graduate School Tsinghua University
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F2101/105—Phosphorus compounds
    • 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
    • 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
    • C02F2209/16—Total nitrogen (tkN-N)
    • 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
    • C02F2209/18—PO4-P

Definitions

  • the invention relates to the field of sewage treatment and water pollution control, in particular to a sewage treatment device and method.
  • Nitrogen, phosphorus and other elements are important pollutants that cause eutrophication of water bodies. Controlling the emission of nitrogen and phosphorus is an important means to control the eutrophication of natural water bodies.
  • the existing sewage treatment process can remove most of the nitrogen and phosphorus in the water body, but a large number of studies have shown that the nitrogen and phosphorus contained in the sewage still cause a higher risk of eutrophication of the receiving water body after the existing sewage treatment process.
  • biological treatment means can effectively remove nitrogen and phosphorus in the secondary sedimentation water, but has the problems of large floor area and long hydraulic retention time.
  • the chemical treatment means can effectively remove the residual phosphorus in the sewage, but has no removal effect on the nitrogen element, and also produces excess sludge which is difficult to handle.
  • microalgae has been increasingly used in the treatment of raw sewage water.
  • microalgae has been increasingly used in the treatment of secondary effluent from sewage plants.
  • micro Algae are often difficult to grow or grow at a slow rate, resulting in long hydraulic retention times and the difficulty of achieving efficient nitrogen and phosphorus removal.
  • the present invention proposes a sewage treatment system and method that are both efficient and energy efficient.
  • the present invention provides an advanced sewage treatment apparatus and method which can remove nitrogen and phosphorus in an extremely efficient and thorough manner.
  • An advanced sewage treatment device comprises a reaction tank, a membrane tank, a first aeration device and a second aeration device; the reaction tank is provided with a water inlet and a microalgae return inlet, the outlet of the reaction tank and the membrane The inlet of the pool is connected; the membrane pool is provided with an algae outlet and a microalgae reflux outlet, and the algae reflux outlet on the membrane pool is connected to the microalgae reflux inlet on the reaction tank through a reflux pump and a reflux tube, wherein the membrane pool is Membrane filter assembly is provided, the membrane filter assembly is provided with a drain port through which water is filtered; the first aeration device is disposed under the reaction tank for supplying gas into the reaction tank The second aeration device is disposed below the membrane tank for supplying gas into the membrane tank.
  • the volume ratio of the membrane pool to the reaction cell is 1:1 to 1:4.
  • the inlet of the gas mixer is respectively connected with the air delivery tube and the carbon dioxide delivery tube, and the outlet of the gas mixer is respectively passed through the pipeline and the first aeration device and The second aeration device is connected.
  • a microalgae collection tank is further included, and the algae drain on the membrane pool is in communication with the microalgae collection tank.
  • An advanced sewage treatment method wherein the method is performed under predetermined lighting conditions by using the sewage advanced treatment device, wherein the reaction tank and the membrane pool of the sewage advanced treatment device contain microalgae, and the microalgae is rotated Single needle algae; includes the following steps:
  • the sewage enters the reaction tank through the water inlet, the first aeration device supplies gas into the reaction tank, and the sewage and the microalgae mixture liquid treated by the reaction tank enters the membrane pool;
  • the second aeration device supplies gas into the membrane tank, and the membrane filtration module in the membrane tank separates the microalgae from the water, and the treated water is discharged through the drainage port on the membrane filtration module, and the microalgae and sewage in the membrane pool A part of the mixed liquid was refluxed into the reaction tank, and a part was discharged through the algae discharge port.
  • the first aeration device supplies a gas into the reaction tank
  • the second aeration device supplies a gas into the membrane pool: providing a mixed gas of air and carbon dioxide, in the mixed gas,
  • the volumetric concentration of carbon dioxide is 1% to 2%; the aeration rate is 0.2v/v ⁇ min -1 to 0.4v/v ⁇ min -1 .
  • the reflux ratio of the microalgae and the sewage mixture is 50% to 200%.
  • the sewage deep treatment device has a hydraulic retention time (HRT) of 2 h to 6 h; and the microalgae residence time (SRT) is 1 day to 4 days.
  • HRT hydraulic retention time
  • SRT microalgae residence time
  • the predetermined illumination condition is: light intensity is 350-1000 ⁇ mol ⁇ m -2 ⁇ s -1 , light-dark cycle ratio is 12h: 12h - 24h: 0h; illumination is provided by sunlight and/or cold fluorescent light source .
  • the sewage entering the reaction tank through the water inlet the total nitrogen concentration is 2-15 mg/L, the total phosphorus concentration is 0.2-1.5 mg/L, and the chemical oxygen demand is ⁇ 60 mg/L.
  • the method of the present invention has the characteristics of high processing efficiency and short residence time.
  • the total inorganic nitrogen of the effluent can be reduced below the detection limit of the national standard ultraviolet spectrophotometry ( ⁇ 0.02 mg/L), and the total phosphorus of the effluent can be reduced to the national standard molybdenum anti-spectrophotometric detection limit. ( ⁇ 0.02mg/L), it can achieve the removal rate of >99% within 6h of HRT, and the average removal effect can reach 99% in long-term operation.
  • the nitrogen and phosphorus content of the effluent from the sewage treatment plant is controlled to a very low level. It is of great significance to reduce the nutrient load of the receiving water body and alleviate the risk of eutrophication of water bodies.
  • FIG. 1 is a schematic view of an advanced sewage treatment device in an embodiment of the present invention.
  • An advanced sewage treatment device which comprises a reaction tank, a membrane tank, a first aeration device and a second aeration device; wherein the reaction tank is provided with a water inlet and a microalgae return inlet, and the outlet of the reaction tank and the membrane pool The inlet is connected; the membrane pond is provided with an algae outlet and a microalgae reflux outlet, and the algae reflux outlet on the membrane tank and the microalgae reflux inlet on the reaction tank are connected through a reflux pump and a reflux tube, and a membrane filtration module is arranged in the membrane tank, and the membrane filtration module is arranged A drain port is provided, and the water is filtered through the membrane filter unit; the first aeration device is disposed under the reaction tank for supplying gas into the reaction tank; and the second aeration device is disposed below the membrane tank for supplying gas into the membrane pool.
  • the volume ratio of the membrane cell to the reaction cell is from 1:1 to 1:4.
  • the sewage advanced treatment device further includes a gas mixer, the inlet of the gas mixer is respectively connected with the air delivery tube and the carbon dioxide delivery tube, and the outlet of the gas mixer is respectively passed through the pipeline and the
  • the first aeration device is connected to the second aeration device, and by such an arrangement, a mixed gas of air and carbon dioxide can be supplied into the reaction cell and the membrane pool, wherein the volume concentration of carbon dioxide in the mixed gas is 1% to 2%;
  • the aeration rate is 0.2v/v ⁇ min -1 to 0.4v/v ⁇ min -1 .
  • the sewage advanced treatment device further comprises a microalgae collection tank, and the algae drain on the membrane pool is connected with the microalgae collection tank, so that the microalgae can be discharged first (for example, by means of overflow) In the algae collection pond, the microalgae in the microalgae collection pond can be transported to other places.
  • a fully mixed aerated photobioreactor can be divided into two zones, one zone as a reaction cell and one zone as a membrane cell; or two fully aerated photobioreactors (one as a reaction)
  • the pool, one as a membrane tank) is assembled into a sewage treatment unit.
  • the membrane filtration module may be, for example, a microfiltration membrane or an ultrafiltration membrane having a pore diameter of 0.01 to 1 ⁇ m.
  • Monochaphide (Monoraphidium.sp.); includes the following steps:
  • the sewage enters the reaction tank through the water inlet, and the first aeration device supplies gas into the reaction tank, and the sewage and the microalgae mixture that has passed through the reaction tank enters (for example, can overflow to the membrane by overflow) Pool
  • the second aeration device supplies gas into the membrane tank, and the membrane filtration module in the membrane tank separates the microalgae from the water, and the treated water is discharged through the drainage port on the membrane filtration module, and the microalgae and sewage in the membrane pool A part of the mixed liquid was refluxed into the reaction tank, and a part was discharged through the algae discharge port.
  • the first aeration device supplies gas into the reaction tank
  • the second aeration device supplies gas into the membrane tank: providing a mixed gas of air and carbon dioxide
  • the volume concentration of carbon dioxide is 1% to 2%
  • the aeration rate is 0.2 v/v ⁇ min -1 to 0.4 v/v ⁇ min -1 .
  • the aeration device may be, for example, a microporous aeration strip.
  • the microbubbles generated by the gas can play a role of mixing and stirring the liquid in the reaction tank, and scouring the membrane filtration component in the membrane pool to control membrane fouling, and at the same time, the gas in the reaction tank and the membrane pool can be micro.
  • the algae replenish the carbon source and always maintain a pH between 6.5 and 7.5 in the membrane cell and in the reaction cell.
  • the reaction tank when the sewage is treated in depth, the reaction tank is in the form of a full mixed reaction, the influent form is continuous influent, the effluent form is continuous effluent, and the algae in the membrane pond is continuous algae, which can be regulated by the feed water pump.
  • the flow rate of the influent water entering the reaction tank is regulated by the outlet pump to regulate the flow rate of the effluent from the membrane tank, and the flow rate of the microalgae and the sewage mixture flowing back from the membrane tank to the reaction tank is regulated by the reflux pump, so that in the step (2),
  • the reflux ratio of the algae and sewage mixture is 50% to 200%; the HRT time for the advanced treatment of sewage is 2h to 6h, and the SRT is 1 to 4 days.
  • the predetermined illumination condition is: light intensity is 350-1000 ⁇ mol ⁇ m -2 ⁇ s -1 , light-dark cycle ratio is 12h: 12h - 24h: 0h; by sunlight and/or cold A fluorescent light source provides illumination.
  • the light intensity may further preferably be 350 to 700 ⁇ mol ⁇ m -2 ⁇ s -1 , and the cold fluorescent light source may be used as a substitute light source when there is no solar light source, or as a supplementary light source when the intensity of the solar light source is insufficient.
  • the main material of the reaction cell and the membrane pool may be plexiglass; when the illumination mode is the upper illumination, the main material of the reaction cell and the membrane pool may be stainless steel.
  • the fluorescent tube can be evenly distributed on the light side to provide the light required for growth of the microalgae inside the reaction cell and the membrane pool.
  • the sewage entering the reaction tank through the water inlet the total nitrogen concentration is 2-15 mg/L, the total phosphorus concentration is 0.2-1.5 mg/L, and the chemical oxygen demand concentration is ⁇ 60mg/L, for example, the sewage to be treated may be secondary effluent from domestic sewage plant or other low nutrient sewage.
  • the inventors have found that even in a sewage having low nutrition (total nitrogen concentration of 2 to 15 mg/L, total phosphorus concentration of 0.2 to 1.5 mg/L, and chemical oxygen demand of ⁇ 60 mg/L),
  • the used Spirulina platensis can also efficiently and thoroughly remove nitrogen and phosphorus in the corresponding conditions of the above device of the present application, and has strong anti-interference, high light intensity tolerance, high pollutant absorption, and extremely low nitrogen and phosphorus.
  • the characteristics of the concentration tolerance can be, using the secondary sewage from the domestic sewage plant or other low-nutrient sewage to culture the microalgae, inoculate the algae into the above reaction tank and membrane pool, and give continuous water in a certain Under the aeration and illumination conditions of carbon dioxide concentration, the nitrogen and phosphorus are absorbed by the microalgae, thereby reducing the concentration of nitrogen and phosphorus in the influent water, and separating the microalgae and water through the membrane filtration module, and then continuously discharging water.
  • the sewage advanced treatment device includes a feed water pump 1, a reaction tank 2, a membrane tank 3, a membrane filtration module 4, an outlet pump 5, an air pump 6, a carbon dioxide delivery tube 7, and a gas mixer.
  • First aeration device 14 microwave aeration strip
  • second aeration device 9 microporous aeration strip
  • reflux pump 10 algae valve 11, microalgae collection tank 12, and light source 13 (sunlight) Or cold fluorescence).
  • the arrows in the figure indicate the flow direction of water, microalgae and sewage mixture (hereinafter also referred to as algae liquid) or gas, and the sewage enters the reaction tank 2 through the feed water pump 1 and the water inlet, and the microalgae treated by the reaction tank 2
  • the mixture with water overflows into the membrane tank 3, and the membrane filtration module 4 in the membrane tank 3 is connected to the water pump 5, which separates the microalgae from the water, and the treated water passes through the drain port on the membrane filtration module 4
  • the outlet pump 5 is discharged to obtain the treated sewage, and a part of the microalgae and the sewage mixture in the membrane tank 3 is returned to the reaction tank 2 through the reflux pump 10, and a part is discharged to the microalgae collection tank through the algae discharge port and the algae valve 11.
  • the microalgae in the microalgae collection tank 12 is further discharged for subsequent treatment; the air enters the gas mixer 8 through the air pump, is mixed with the carbon dioxide entering the gas mixer 8 through the carbon dioxide delivery tube, and then transported to the respective The first aeration device 14 and the second aeration device 9 supply air to the reaction cell and the membrane cell.
  • the carbon dioxide concentration is 1-2%, the aeration rate is 0.2-0.3 (v/v ⁇ min -1 ), the illumination intensity of the cold fluorescent lamp is adjusted to 400 ⁇ mol ⁇ m -2 ⁇ s -1 , and the light-dark cycle ratio is set to 24h/0h.
  • the HRT of the reaction tank is set to 2 to 4 hours, the algae liquid in the reaction tank overflows to the membrane tank 3, the water flow rate is controlled by the water discharge pump 5 connected to the membrane filtration module 4, and the membrane filtration is monitored by a pressure gauge (not shown) on the water outlet pipe. The components are cleaned regularly.
  • the HRT of the membrane pool is set to 1 to 2 h, and part of the algae liquid is refluxed to the reaction tank 2 by a reflux pump 10 at a reflux ratio of 50% to 100%, and the algae liquid in the membrane pool 3 overflows to the microalgae collection tank 12, and then passes through the row.
  • the algae pump (not shown) is discharged.
  • the nitrogen and phosphorus nutrient load of the advanced sewage treatment device can still reach 60-95g N/(m 3 ⁇ d) and 6-9.5g P respectively. /(m 3 ⁇ d).
  • Rotating single-needle algae can achieve almost complete nitrogen and phosphorus absorption, nitrogen and phosphorus removal rates are above 99%, and effluent nitrogen and phosphorus concentrations are lower than UV spectrophotometry and molybdenum anti-spectrophotometric detection limits ( ⁇ 0.02mg/ L).
  • the concentration of microalgae in the reaction cell and the membrane cell in the apparatus can reach 0.75 to 1.2 kg/m 3 and 1.5 to 2.2 kg/m 3 (dry weight), respectively.
  • the yield of microalgae can reach 1 ⁇ 1.6kg/(m 3 ⁇ d).
  • the secondary effluent Take the actual secondary effluent of a domestic sewage treatment plant (TN 6 ⁇ 12mg/L, TP 0.3 ⁇ 1.0mg/L, chemical oxygen demand ⁇ 60mg/L), inoculate Rotary single-needle algae in the reaction tank and membrane tank, initial seeding density About 5 ⁇ 10 6 /mL, the secondary effluent enters the reaction tank 2 by the feed water pump 1, adjusts the flow rate of the air pump 6, controls the aeration of the microporous aeration strip to a concentration of 1-2%, and the aeration rate is 0.2-0.3.
  • the HRT of the membrane pool is set to 1.5 to 2 h, and part of the algae liquid is refluxed to the reaction tank 2 by a reflux pump 10 at a reflux ratio of 200%, and the algae liquid in the membrane pool 3 overflows to the microalgae collection tank 12, and then passes through the algae pump ( It is not shown in the figure.
  • the nitrogen and phosphorus nutrient load of the sewage advanced treatment device can still reach 30 to 50 g N/(m 3 ⁇ d) and 4 to 6 g P/(m 3 ⁇ d), respectively.
  • Rotating single-needle algae can achieve almost complete nitrogen and phosphorus absorption, nitrogen and phosphorus removal rates are above 99%, and effluent nitrogen and phosphorus concentrations are lower than UV spectrophotometry and molybdenum anti-spectrophotometric detection limits ( ⁇ 0.02mg/ L).
  • the concentration of microalgae in the reaction cell and the membrane cell in the apparatus may be 0.4 to 0.6 kg/m 3 and 0.7 to 1.0 kg/m 3 (dry weight), respectively.
  • the yield of microalgae can reach 0.5-0.8 kg/(m 3 ⁇ d).
  • the invention utilizes the advanced treatment device and method for the high-efficiency limit nitrogen and phosphorus removal of rotating single-needle microalgae, and applies the rotating single-needle algae as the high-efficiency limit nitrogen and phosphorus removal microalgae, and adopts the sewage plant secondary sedimentation water or similar low nitrogen phosphorus group. Separation of sewage, under the residence time of 6h, the growth rate of microalgae up to 1.6kg / (m 3 ⁇ d) and nitrogen of 95g N / (m 3 ⁇ d), 9.5g P / (m 3 ⁇ d) Phosphorus removal efficiency, after treatment by the device and method, the nitrogen and phosphorus removal rate in the sewage can reach more than 99%.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Botany (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention porte sur un procédé de traitement avancé des eaux usées, qui utilise un Monoraphidium contortum pour mettre en œuvre l'élimination de l'azote et du phosphore dans une condition de lumière prédéterminée. Le procédé comprend les étapes suivantes : 1) les eaux usées entrent dans un bassin de réaction (2) au moyen d'une entrée d'eau, un premier dispositif d'aération (14) fournit du gaz au bassin de réaction (2), et les eaux usées et le mélange de microalgues obtenu après traitement dans le bassin de réaction (2) entrent dans un bassin à membrane (3) ; 2) un second dispositif d'aération (9) fournit du gaz au bassin à membrane (3), un composant de filtre à membrane (4) dans le bassin à membrane (3) sépare les microalgues de l'eau, l'eau traitée est évacuée au moyen d'un orifice d'évacuation d'eau sur le composant de filtre à membrane (4), une partie des microalgues et du mélange d'eaux usées dans le bassin à membrane (3) retourne au bassin de réaction (2), et une partie du mélange est évacuée au moyen d'un orifice d'évacuation des microalgues. L'invention concerne également un appareil de traitement avancé d'eaux usées, comprenant un bassin de réaction (2), un bassin à membranes (3), un premier dispositif d'aération (14) et un second dispositif d'aération (9).
PCT/CN2018/088770 2018-02-09 2018-05-29 Dispositif et procédé de traitement avancé des eaux usées Ceased WO2019153584A1 (fr)

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CN201810135954.1A CN108217964B (zh) 2018-02-09 2018-02-09 一种污水深度处理装置与方法
CN201810135954.1 2018-02-09

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CN110563269A (zh) * 2019-09-17 2019-12-13 上海济旦水科技有限公司 一种污水处理装置以及利用微藻处理污水兼利用污水生产微藻的方法
CN111320283A (zh) * 2020-03-19 2020-06-23 南昌航空大学 一种絮凝微藻处理稀土矿废水的装置及方法
WO2022177901A1 (fr) * 2021-02-16 2022-08-25 Eget Liber, Inc. Appareil de détection, d'évaluation et d'atténuation de cyanobactéries
CN116328532A (zh) * 2023-01-17 2023-06-27 中国电力工程顾问集团西北电力设计院有限公司 一种碳捕集生物反应池及运行方法
CN116854238A (zh) * 2023-08-14 2023-10-10 江苏吉尧新材料科技有限公司 一种生物膜的蓝藻过滤装置

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