WO2005049511A1 - リン酸マグネシウムアンモニウムの生成・回収方法及び装置 - Google Patents
リン酸マグネシウムアンモニウムの生成・回収方法及び装置 Download PDFInfo
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- WO2005049511A1 WO2005049511A1 PCT/JP2004/017136 JP2004017136W WO2005049511A1 WO 2005049511 A1 WO2005049511 A1 WO 2005049511A1 JP 2004017136 W JP2004017136 W JP 2004017136W WO 2005049511 A1 WO2005049511 A1 WO 2005049511A1
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- sludge
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- map
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- magnesium phosphate
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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
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
- C02F11/14—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
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
Definitions
- the present invention relates to a system for treating organic wastewater in a sewage treatment plant, various wastewater treatment facilities, and the like. More specifically, the present invention relates to magnesium phosphate ammonium from wastewater containing phosphorus and nitrogen.
- MAP Magnetic Ammonium Phosphate: Initially also called “MAP”: Chemical formula is MgNH PO ⁇ 6 ⁇ ⁇ )
- the anaerobic anoxic aerobic method has a problem in that the treatment performance is not stable due to changes in water quality and external environment due to seasonal fluctuations. Sometimes a method is needed. As a result, there are problems in that the processing steps are complicated and the running costs such as the cost of chemicals are high.
- the MAP crystallization method can stably recover phosphorus in particular, since the operation is less complicated.
- the recovered MAP contains 13% phosphorus by weight and has the added value of being an excellent fertilizer, and is considered to be an excellent phosphorus and nitrogen removal and recovery technology from the viewpoint of effective use of resources. .
- MAP crystallization method too, (1) the cost of chemicals such as sodium hydroxide as a ⁇ regulator and magnesium chloride as a Mg source is high; (2) 30 minutes When MAP is crystallized rapidly with a short residence time (hereinafter referred to as “rapid MAP reaction”), fine MAP particles are generated, and the fine MAP particles are entrained in the treated water flowing out of the MAP reactor.
- rapid MAP reaction a short residence time
- MAP recovery rate is reduced to about 60-70% because it is excreted; (3)
- the rapid MAP reaction when about 10 OOmg / L or more of SS is mixed in the liquid, the SS entangles with the MAP crystallization product (4) If an anaerobic digestion step is used before the MAP treatment step, the MAP reaction is already performed in the anaerobic digestion step. It's happening. For this reason, it is difficult to separate the generated MAP particles from the organic SS as it is, and there is a problem that the MAP particles are disposed of in a mixed state with the sludge without being recovered!
- the present inventors have proposed a technique for efficiently recovering phosphorus in wastewater as MAP that solves the above-mentioned conventional problems (see Japanese Patent Application Laid-Open No. 2002-45889, International Application PCTZ JP03Z04909).
- the excess sludge generated in the organic wastewater treatment process generally, the primary sludge settled and separated in the first settling tank and the sludge separated in the final settling tank
- Activated sludge that has settled and separated It means a mixture of excess sludge excluding returned sludge.
- An object of the present invention is to solve the above-described problems of the conventional technology. That is, the present invention efficiently recovers phosphorus and the like as MAP crystals from wastewater containing phosphorus and nitrogen in an organic wastewater treatment system, and greatly enhances the treatment performance of biological denitrification and dephosphorization. It is an object of the present invention to provide a method and an apparatus for improving the above. That is, the present invention provides a reasonable organic wastewater treatment system that reduces the reaction time for phosphorus recovery in addition to the inexpensive drug cost.
- the conventional MAP recovery technology has the advantages of reducing drug cost and not requiring a special reactor, but has the disadvantage of requiring a long reaction time of about 25 days.
- the present inventors conducted further studies and studied the use of sludge and wastewater with a size of 300 to 1000 ⁇ m in a wastewater treatment system that does not assume anaerobic digestion of sludge. We succeeded in establishing a technology to efficiently recover MAP as granular MAP.
- the present invention makes it possible to solve the above problems by the following means.
- [0014] A method for treating sludge generated in a biological treatment step of organic wastewater utilizing microbial metabolism, wherein the sludge is subjected to acid fermentation by facultative anaerobic bacteria. Treatment to elute phosphate ions and ammonia ions from the sludge, By adding the magnesium source, magnesium phosphate ammonium particles are generated from the eluted phosphate ions and ammonium ions, and magnesium phosphate ammonium particles are generated from the sludge containing the generated magnesium phosphate particles.
- -A method for treating sludge comprising separating rubber particles.
- Item 5 The device according to Item 4, which is provided.
- the present invention can exert the following effects in an organic wastewater treatment system, particularly in a system for recovering phosphorus from wastewater containing organic matter, nitrogen, and phosphorus.
- Phosphorus can be recovered as high-purity MAP. Specifically, at a purity of 70% or more, with the highest purity Phosphorus can be recovered as 92% MAP.
- the system can be applied to a treatment system without using anaerobic digestion treatment of sludge (residence days: about 25 days). Furthermore, even in a system where a sludge digestion tank is already installed, MAP generation in the digestion tank is suppressed, so that the maintenance and management of the digestion tank itself becomes easy.
- the amount of chemicals used is smaller than that of the conventional MAP recovery device (because the alkali-added saccharine is kept to the minimum necessary for the reaction to proceed in the neutral pH range).
- FIG. 1 is a flowchart of an embodiment of a processing apparatus of the present invention.
- FIG. 2 is a flowchart of another embodiment of the processing apparatus of the present invention.
- FIG. 3 is a flowchart of an embodiment described in Japanese Patent Application No. 2000-231633.
- FIG. 4 is a flowchart of an embodiment of a conventional processing apparatus.
- FIGS. 1 and 2 show one embodiment of the present invention, and the present invention is not limited to these embodiments.
- the “excess sludge” in the present invention covers all sludge generated in the organic wastewater treatment process.
- the organic wastewater (influent water) 1 is first introduced into the sedimentation basin 11, where sedimented suspended matter is sedimented and separated.
- the supernatant water 2 after the solid-liquid separation is led to a biological water treatment reaction tank 12, where BOD, nitrogen, phosphorus, etc. are purified.
- the biological water treatment reaction tank 12 is provided with an air supply device for supplying oxygen necessary for the activity of the aerobic microorganisms.
- this reaction tank may be a single tank, it is generally preferable to have a plurality of tanks.
- a method has been implemented to efficiently purify nitrogen and phosphorus as well as BOD alone.
- control means are used to artificially control the biological metabolic function by placing some tanks in an anaerobic state, but this control means includes a circulating nitrification denitrification method, an anaerobic oxygen-free oxygen-aerobic method, and the like. It is said that.
- an anaerobic oxygen-free aerobic tank can be used as the biological water treatment reaction tank 12.
- the effluent water 3 from the biological water treatment reaction tank 12 is introduced into the final sedimentation basin 13, where it is subjected to solid-liquid separation.
- the supernatant water after solid-liquid separation is discharged out of the system as treated water 4.
- Part of the solid-liquid separated sludge is returned to the biological water treatment reaction tank 12 as return sludge 15, thereby Thus, the amount of cells in the biological water treatment reaction tank 12 is maintained.
- the remaining sludge is sent to the sludge concentrator 21 together with the initial sludge 5 that has been solid-liquid separated in the first settling tank 11 as surplus sludge 6.
- the sludge concentrator 21 may be a sedimentation method or a mechanical concentration method, or may be a method in which chemicals are added as long as it does not combine with the soluble phosphorus ammonia. Basically, the initial sludge 5 and the excess sludge are used. It is only necessary to be able to concentrate 6
- the concentrated sludge 7 thus obtained is introduced into a tank for leaching of ammonium phosphate-ammonia ion and producing MAP.
- the concentrated sludge 7 may be introduced into the phosphate / ammonia ion elution and MAP generation tank 22 after being subjected to ultrasonic treatment or ozone treatment.
- reaction tank 22 In the phosphate 'ammo-pium ion elution and MAP generation tank 22 (hereinafter also referred to as "reaction tank 22"), a biological treatment mainly comprising acid fermentation by facultative anaerobic bacteria is performed, In the first stage of organic matter decomposition by facultative anaerobic bacteria, that is, acid fermentation and other means, sludge power and phosphorus and ammonia are eluted, and MAP is synthesized from the generated phosphate ion and ammonium ion power. At the core of the invention method.
- the treatment can be performed in a short period of 5 hours to 60 hours.
- some anaerobic bacteria are generated in the facultative anaerobic bacteria depending on the ventilation conditions and temperature conditions of the reaction tank 22, although it may be involved in the elution reaction of ammonium phosphate ion, the reaction tank 22 is basically used assuming elution of phosphate ammonium ion by facultative anaerobic bacteria.
- the biological treatment mainly performed by acid fermentation by a facultative anaerobic bacterium means “not mainly treated by an anaerobic bacterium”. It can be explained as follows. Absolute anaerobic methane-producing bacteria mainly decompose organic acids such as propionic acid into methane in a digestion tank with a retention time of about 25 days in ordinary anaerobic digestion, but the retention time is also compared in this process It is considered that the main microorganisms are facultative anaerobic bacteria because aeration is performed as needed for a short time. However, some anaerobic bacteria such as methanogens may be generated depending on the operating conditions.
- the expression “absolute anaerobic bacteria is not mainly used” is used above. In other words, it can be expressed that "the anaerobic treatment step using substantially only anaerobic bacteria is not substantially incorporated".
- the purpose of the treatment system using this reactor is simply to “decompose organic matter to increase organic acids and soluble phosphorus”, and not to further decompose the generated organic acid to generate methane.
- methane may be produced by partially generated anaerobic bacteria, but this is not a problem. This is because the progress of methane fermentation promotes the elution of phosphate and ammonia ions, and does not hinder MAP production at all.
- a pH adjuster may be appropriately added as necessary, temperature adjustment, appropriate agitation, appropriate aeration, etc. may be performed. It comes out.
- the SS (suspended solid) phosphorus and the SS nitrogen incorporated in the sludge can be transformed into the dissolved state of phosphate phosphorus and ammonia nitrogen.
- the conditions in the reaction tank are adjusted so as to generate high-purity MAP with good separability in the sludge in the reaction tank 22.
- Mg sources such as magnesium hydroxide and magnesium salt, and gentle stirring to grow MAP crystals. It is also possible to carry out the circulation of a part of the recovered MAP 9 in the latter stage as stirring and further as seed crystals.
- the aforementioned magnesium hydroxide is also an alkali source, a Mg source used in the MAP formation reaction, and has the effect of two birds per stone.
- an alkali agent or the like is often added to maintain the pH in the range of 8.0-9.0, but this process assumes a pH of around 7.0. Therefore, the amount of chemicals such as a pH adjuster used can be reduced.
- the amount of Mg added is from equimolar to 2 times the molar amount of the phosphate ions.
- the range is appropriate. Taking into account both the reduction of phosphate ions and the efficiency of Mg use, 1.1 to 1.4 moles is the optimal amount of Mg added.
- pH is an important condition.
- the acidic region is less preferred, and rather alkaline.
- the pH is preferably in the range 6.8-7.7, and more preferably between 7.1-7.4.
- any one capable of causing a MAP reaction by adding Mg2 + to an equimolar amount or more of a phosphate ion or an ammonium ion without inhibiting acid fermentation can be used. It can be applied to scabs, seawater, or even wastewater. Due to the principle of crystallization, the higher the substrate concentration of phosphate or ammonium ion, the higher the amount of MAP produced.
- salted magnesium has relatively high solubility, so it can be dissolved in water and injected as high concentration Mg.
- magnesium hydroxide is the most inexpensive, and a method of directly injecting an inexpensive slurry of magnesium hydroxide for industrial use is preferable in terms of cost and operation.
- Mg injection is mixed into raw sludge just before entering the acid fermentation tank.
- the method is effective in preventing a rapid MAP response.
- Mixing a slurry of magnesium hydroxide with low solubility among Mg compounds into raw sludge and then injecting it into an acid fermentation tank is effective in further increasing the recovery rate of MAP.
- MAP particles returned to the MAP production tank as seed crystals are preferably those with a diameter of 150 ⁇ m or more, and more preferably those with a diameter in the range of 250 to 800 ⁇ m.
- the decomposition of organic matter in the sludge is reduced to a decomposition reaction mainly based on acid fermentation, and the reaction is not actively advanced to methane fermentation.
- Sludge with reduced phosphorus and nitrogen concentrations due to MAP formation which can leave a large amount of acid, is returned to the biological water treatment process to be used, for example, as a hydrogen donor for denitrification or as a BOD source for dephosphorization.
- the power of the present invention is, of course, extremely effective in a facility without a digestion tank.
- the present invention is also effective in a facility with a digestion tank.
- the present invention also has an advantage that sludge can be reduced.
- the effluent sludge 8 containing MAP efficiently generated in the phosphate ⁇ ⁇ ⁇ ⁇ ammonia ion elution and MAP generation tank 22 is introduced into the MAP separation and recovery machine 23.
- the MAP separation and recovery machine 23 the separation equipment described in Japanese Patent Application No. 2002-328336 and Japanese Patent Application No. 2002-326968 S Desired liquid cyclone, electric sieve or screen-like separator, sediment Separation equipment, MAP cleaning equipment, and a system combining them can be used!
- the MAP separated and recovered by the MAP separation and recovery machine 23 can be used as a fertilizer raw material or the like as a phosphorus-containing valuable material.
- a part of the MAP can be returned to the MAP generation tank 22 for dissolving the phosphoric acid and ammonia ion if necessary, and used as a seed crystal for MAP synthesis.
- the MAP desorbed sludge 10 from which the MAP has been removed in the MAP separation and recovery machine 23 can be directly dewatered by a sludge dewatering device 24 as shown in FIG.
- the dewatered filtrate 32 may first be returned to the sedimentation basin 11 or the like.
- MAP desorbed sludge 10 is directly led to the dewatering step, the dewatering performance decreases, a large amount of chemicals such as a flocculant is required, and the water content of the cake increases. May be.
- a part of the MAP desorbed sludge 10 can be returned to the biological water treatment step 12, as shown in FIG. At this time, a part of the excess sludge 6 and the concentrated sludge 7 can be guided to the sludge dewatering device 24 (not shown).
- the MAP desorbed sludge 10 has a significantly lower phosphorus content in the liquor, unlike the return sludge of the conventional standard activated sludge treatment method. Almost decomposable organic substances such as organic acids contained are used as a hydrogen donor for denitrification in biological water treatment and a BOD source for phosphorus removal. There is an advantage that it can be used efficiently. However, in this case, although the sludge dewatering performance and biological water treatment performance are improved, the MAP recovery rate tends to decrease. Further, in the present invention, a part of the MAP desorbed sludge 10 can be returned to the phosphate / ammonia ion elution / MAP generation tank 22. In this way, there is an advantage that the fine MAP particles in the sludge that cannot be recovered completely serve as seed crystals, grow and grow to a sufficient size, and can be recovered as MAP particles.
- FIG. 1 and FIG. 2 a method using both FIG. 1 and FIG. 2 which does not limit the type of sludge guided to the sludge dewatering device 24 can be adopted.
- both operations can be performed in advance. It is a good idea to do so.
- the dewatered cake 31 dewatered by the sludge dewatering device 24 may be carried out of the system as it is, or may be subjected to drying 'incineration' melting treatment to reduce the volume.
- the phosphorus content in the dewatered cake is reduced, so that fly ash problems due to phosphorus can be avoided.
- FIG. 3 is a flowchart of the embodiment described in Japanese Patent Application No. 2000-231633.
- the MAP generation tank 25 is an anaerobic digestion tank. Anaerobic digestion tanks require huge and large facilities with a very long residence time of 25 days, and have large space and cost constraints. Also, H S
- FIG. 4 is a flowchart of an embodiment of a conventional processing apparatus.
- the flow is such that, after the addition of Mg in the anaerobic digestion tank 25, the sludge power discharged from the anaerobic digestion tank is introduced into the dehydrator 24 without passing through the MAP separation and recovery machine. Therefore, the MAP particles generated in the anaerobic digestion tank are not collected and are mixed into the dewatered cake, causing damage to the dewatering machine and the conveyor due to wear.
- This example is an experiment example using a sludge plant of a sewage treatment plant by a pilot plant, and the flow is the same as the flow of FIG. 1 described above.
- a sewage treatment plant adopts activated sludge treatment by anaerobic anoxic aerobic method.
- the primary sludge collected from the sewage treatment plant A and the excess sludge were mixed at about 1: 1 and concentrated by a centrifugal concentrator.
- the concentrated sludge was introduced into the MAP production tank 22 for eluted phosphate and ammonia ions.
- the tank 22 has a hopper shape at the bottom of the tank, and the inside of the tank is agitated by a stirrer.
- the MAP particles at the bottom of the tank are entirely dispersed in the tank.
- the other conditions of the tank 22 were as follows: hydraulic retention time: 60 hours, water temperature: 45 ° C., aeration: 0.12 wm, pH: 7.3, MAP (hexahydrate) concentration: 1.5 g / L Set to. Mg source and P H adjusting agent is introduced into cistern 22 was 35% Mizusani ⁇ magnesium slurry and Mizusani ⁇ sodium solution. The MAP concentration was adjusted by returning a part of the MAP concentrated slurry concentrated by the liquid cyclone to the tank 22.
- MAP separator 23 As the MAP separator 23, a combination of a vibrating sieve having a hole diameter of 2 mm, a liquid cyclone, and a rotary cylindrical type classifier was used in series.
- the dehydrator used was a screw press type dehydrator.
- the existing plant to which the present invention is not applied that is, the initial sludge 5 from the first sedimentation basin and the excess sludge 6 from the final sedimentation basin are dewatered and desorbed without performing digestion treatment.
- a wastewater treatment experiment was also conducted by a plant with a flow of returning the liquid to the sedimentation basin 11 first.
- Table 2 shows the treatment results for 30 days after the start of operation. From Table 2, it can be seen that the treatment results of the embodiment are significantly better in the effluent water quality, especially T-N and T-P.
- the reasons for this result include a reduction in the load of phosphorus and nitrogen contained in the return water compared to the conventional return water, and the denitrification and denitrification of the water treatment system by the return water containing a relatively large amount of organic acids. Increasing the efficiency of the phosphorus reaction and the like.
- Sludge generation also decreased by about 30% on a solid basis.
- This example is an example of an experiment conducted by a pilot plant using sludge from a food wastewater treatment plant A, and the flow is the same as the flow in FIG. 2 described above.
- the A treatment plant adopts the activated sludge treatment by the anaerobic anoxic aerobic method as the biological water treatment process 12.
- the initial settled sludge and excess sludge collected from the A treatment plant were mixed approximately 2: 1 and concentrated using a gravity concentrator.
- the concentrated sludge was introduced into the MAP production tank 22 for eluted phosphate and ammonia ions.
- the tank 22 was provided with an ultrasonic treatment device in the sludge introduction pipe section, and the concentrated sludge was injected into the phosphate / ammonia ion elution and MAP generation tank 22 after being subjected to ultrasonic treatment.
- the tank 22 has a hopper shape at the bottom of the tank, and the inside of the tank is stirred by a stirrer. By continuously circulating the sludge withdrawn from the bottom of the tank to the top of the tank, the MAP particles at the bottom of the tank were allowed to flow throughout the tank.
- the other conditions of the tank 22 are as follows: hydraulic retention time: 45 hours, water temperature: 40 ° C., aeration: 0.15 wm, pH: 7.2, MAP (salt 6) concentration: 1. Og / L. Set.
- the same Mg source, pH adjuster, MAP separation device 23, and dehydrator 24 as those introduced in Example 1 were used.
- the dewatered dewatered solution of the existing plant to which the present invention is not applied that is, the initial sludge 5 from the first sedimentation basin and the excess sludge 6 from the final sedimentation basin without being digested.
- the initial sludge 5 from the first sedimentation basin and the excess sludge 6 from the final sedimentation basin without being digested.
- a part of the MAP desorbed sludge 10 was returned to the inlet of the anaerobic tank and the inlet of the anaerobic tank of the anaerobic and anaerobic aerobic tank 12, and the amount of each returned was adjusted as needed.
- the remaining MAP desorbed sludge 10 was mixed with a part of the primary sludge 5 and dewatered by a dehydrator 24.
- Table 3 shows the treatment results for 30 days after the start of operation. Table 3 shows that, as in Example 1, the effluent quality is particularly better in the effluent water quality, especially in T N and T P.
- the sludge since the concentrated sludge was subjected to the ultrasonic treatment, the sludge was more soluble than usual, and the dissolved phosphorus and nitrogen increased in power. Since was recovered as MAP, there was no adverse effect on the concentration of phosphorus and nitrogen in the treated water. About 55% of the phosphorus in the influent could be recovered as MAP. In addition, sludge generation was reduced by about 35% on a solid basis. In addition, since a part of the initial sludge 5 is added to the MAP desorbed sludge 10, the dewatering property of the sludge is also improved, and it is possible to obtain a dewatering property equal to or higher than that of the dewatered cake of the existing plant. Was.
- This example is an experimental example by a pilot plant using sludge from a wastewater treatment plant of a food factory A, and the flow is the same as the flow of Fig. 2 shown above.
- the wastewater treatment plant at Factory A adopts activated sludge treatment by the anaerobic anoxic aerobic method.
- the initial settled sludge and excess sludge collected from the treatment plant of Factory A were mixed at a ratio of about 2: 1 and concentrated using a gravity concentrator.
- the concentrated sludge was first introduced into an ozone treatment tank (not shown in FIG. 2), subjected to a solubilization treatment with ozone, and then introduced into a phosphate-ammonia ion elution and MAP generation tank 22.
- the tank 22 has a hopper shape at the bottom of the tank, and the inside of the tank is agitated by a stirrer.
- the sludge drawn from the bottom of the tank is continuously circulated to the top of the tank so that the MAP particles at the bottom of the tank are discharged into the tank. The whole was flowed.
- the other conditions of the tank 22 are as follows: hydraulic retention time: 45 hours, water temperature: 40 ° C., aeration: 0.15 wm, pH: 7.2, MAP (salt 6) concentration: 1. Og / L. Set.
- the same Mg source, pH adjuster, MAP separator 23, and dehydrator 24 as those used in Example 1 were introduced into the tank 22.
- the existing plant to which the present invention is not applied ie, the initial settling sludge 5 from the first sedimentation basin and the excess sludge 6 from the final sedimentation basin are dehydrated without digestion treatment and desorbed.
- the initial settling sludge 5 from the first sedimentation basin and the excess sludge 6 from the final sedimentation basin are dehydrated without digestion treatment and desorbed.
- a part of the MAP desorbed sludge 10 was returned to the anaerobic tank inlet and the anaerobic tank inlet of the anaerobic and anaerobic aerobic tank 12, and the amount of each returned was adjusted as necessary.
- the remaining MAP desorbed sludge 10 was mixed with a part of the primary sludge 5 and dewatered by a dehydrator 24.
- Table 4 shows the treatment results for 30 days after the start of operation. Table 4 shows that, as in Example 1, the effluent quality, especially in the case of TNTP, is significantly better in the Example.
- the present invention is a technique useful as a method and apparatus for efficiently recovering phosphorus and the like as magnesium phosphate ammonium crystals from wastewater containing phosphorus and nitrogen in a sewage treatment plant, various wastewater treatment facilities, and the like.
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Priority Applications (2)
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EP04818940A EP1698595A4 (en) | 2003-11-21 | 2004-11-18 | PROCESS FOR PRODUCING / RECOVERING MAGNESIUM AMMONIUM PHOSPHATE AND DEVICE THEREFOR |
JP2005515635A JP4516025B2 (ja) | 2003-11-21 | 2004-11-18 | リン酸マグネシウムアンモニウムの生成・回収方法及び装置 |
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US9334166B2 (en) | 2011-02-03 | 2016-05-10 | Multiform Harvest Inc. | Methods and compositions for chemical drying and producing struvite |
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CN114180693A (zh) * | 2021-12-02 | 2022-03-15 | 湖北远大生物技术有限公司 | 一种生物酶法生产氨基酸产生废水的综合处理方法及在制备鸟粪石中的应用 |
CN114956424A (zh) * | 2022-05-31 | 2022-08-30 | 中冶赛迪技术研究中心有限公司 | 利用脱硫废液处置系统的烧结机头灰脱氨方法 |
CN114956424B (zh) * | 2022-05-31 | 2023-09-26 | 中冶赛迪技术研究中心有限公司 | 利用脱硫废液处置系统的烧结机头灰脱氨方法 |
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JPWO2005049511A1 (ja) | 2007-06-07 |
EP1698595A1 (en) | 2006-09-06 |
CN100412013C (zh) | 2008-08-20 |
EP1698595A4 (en) | 2010-03-17 |
JP4516025B2 (ja) | 2010-08-04 |
CN1894167A (zh) | 2007-01-10 |
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