JP4485007B2 - Nitrogen-containing wastewater treatment system - Google Patents

Nitrogen-containing wastewater treatment system Download PDF

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Publication number
JP4485007B2
JP4485007B2 JP2000095081A JP2000095081A JP4485007B2 JP 4485007 B2 JP4485007 B2 JP 4485007B2 JP 2000095081 A JP2000095081 A JP 2000095081A JP 2000095081 A JP2000095081 A JP 2000095081A JP 4485007 B2 JP4485007 B2 JP 4485007B2
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nitrogen
containing wastewater
treatment system
wastewater treatment
solid
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JP2001276891A (en
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憲尋 志村
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Sumitomo Heavy Industries Environment Co Ltd
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Sumitomo Heavy Industries Environment Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、火力発電設備における排水、下水・屎尿処理設備における排水、産業排水処理設備における排水などに含まれる窒素を除去する、窒素含有排水処理システム及び窒素含有排水処理方法に関する。
【０００２】
【従来の技術】
窒素含有排水を処理する従来の排水処理システムの一例を図３に示す。
【０００３】
処理すべき窒素含有排水をｐＨ調整槽１１０に送り、ここで消石灰（Ｃａ（ＯＨ）2）を添加して所定のｐＨ値となるようにアルカリ性にｐＨ調整する。この処理により、窒素含有排水中に含まれる炭酸イオン（ＣＯ3 2-）などは、カルシウムイオン（Ｃａ2+）と反応して塩となりスケールとして析出する。
【０００４】
析出したスケールは沈殿物として回収できるため、凝集沈殿槽１２０に送って固液分離を行う。ここでスケールと分離された窒素含有排水を、凝集沈殿槽１２０から流出させ、熱交換器１３０を経由して加温した状態で放散塔１４０の塔頂に供給する。放散塔１４０内において、窒素含有排水を蒸気と接触させてアンモニアを放散させる。放散塔１４０の塔頂からの排出ガスを、所定の排ガス処理設備１５０に送り、ここで排出ガス中のアンモニア分を除去・回収する。一方、放散塔１４０において放散処理を受けた放散処理水は、熱源として熱交換１３０に供給した後、中和処理設備１７０において所定の中和処理が行われる。
【０００５】
【発明が解決しようとする課題】
しかし、ここで析出するスケールは、温度上昇に伴って溶解度が低下する性質を持っているため、凝集沈殿槽１２０から流出した窒素含有排水が熱交換器１３０によって加温されることにより、スケールの溶解度が低下して排水中にスケールが析出し、熱交換器１３０以降の配管１６０内や放散塔１４０内に、この析出したスケールが付着する状況となる。その結果、熱交換器１３０と放散塔１４０との間の配管１６０では、スケールによる目詰まりが生じ易く、一端目詰まりが生じた場合には、配管１６０を酸で洗浄する洗浄作業や、配管１６０の取り替え作業などが必要となる。
【０００６】
さらに、このようなスケールの発生原因となるアルカリ金属やアルカリ土類金属が高濃度で含有される窒素含有排水を処理する場合には、この現象が増長されることになり、洗浄作業等のために、排水処理システムの稼働を数日毎に停止しなければない事態となり、プロセス性能の安定維持がより一層困難となる。
【０００７】
本発明はこのような課題を解決すべくなされたものであり、その目的は、温度上昇に伴って溶解度が低下する特性を有するスケールであっても、前述した凝集沈殿槽以外でのスケールの発生を抑えて、排水処理システムのプロセス性能を安定して維持し得る窒素含有排水処理システム及び窒素含有排水処理方法を提供することにある。
【０００８】
【課題を解決するための手段】
そこで、請求項１にかかる窒素含有排水処理システムは、窒素含有排水から窒素を除去する窒素含有排水処理システムであって、窒素を除去すべき窒素含有排水を加温する加温手段と、加温手段を介して加温された後の窒素含有排水に対してアルカリを添加し、この窒素含有排水を所定のアルカリ性に調整する調整手段と、調整手段によってアルカリ性に調整された窒素含有排水から不溶性塩を分離する固液分離手段と、固液分離手段によって不溶性塩が分離された後の窒素含有排水を、所定の放散用ガスと接触させることにより、この窒素含有排水からアンモニアを放散させる放散手段とを備え、固液分離手段で分離された不溶性塩を、調整手段に導入する第１導入手段をさらに備えて構成する。
【０００９】
アンモニアを効率よく放散させるため、放散手段には常温に比べてより高い温度の窒素含有排水を導入することが望ましく、この点、排水処理システムをこのように構成することで、予め加温手段によって加温された窒素含有排水が、調整手段、固液分離手段を経て、比較的高い温度のまま放散手段まで送ることができる。そして、固液分離手段以降の処理で加温されることがないため、温度上昇に伴って溶解度が低下する特性を有するスケールであっても、固液分離手段と放散手段との間の配管や放散手段での、スケールの発生を抑制することができる。
【００１０】
請求項２にかかる窒素含有排水処理システムは、請求項１における窒素含有排水処理システムにおいて、加温手段は、前記放散手段によってアンモニアが放散された後の放散処理水と熱交換する熱交換手段である。
【００１１】
このように加温手段を、放散処理水を熱源とする熱交換手段で構成することで、熱回収ができ、排熱を有効に利用することができる。
【００１３】
また、請求項１にかかる窒素含有排水処理システムでは、第１導入手段によって、固液分離手段で分離された不溶性塩を再び調整手段に導入することで、調整手段に導入された不溶性塩が種となり、この種を中心として不溶性塩が成長するため不溶性塩の成長が促される。この作用により、不溶性塩がより大きな粒となって固液分離手段において沈降分離し易くなる。
【００１４】
請求項３にかかる窒素含有排水処理システムは、請求項１における窒素含有排水処理システムにおいて、放散手段によってアンモニアが放散された後の放散処理水を、調整手段に導入する第２導入手段をさらに備えて構成する。
【００１５】
放散処理水には調整手段で添加されたアルカリが含まれるため第２導入手段によって放散処理水を調整手段に導入することで、調整手段に添加するアルカリを回収して再利用できる。
【００１８】
【発明の実施の形態】
以下、本発明の実施形態につき、添付図面を参照して説明する。
【００１９】
図１に実施形態にかかる窒素含有排水（以下、「原水」と称す。）の排水処理システムを示す。アンモニア態窒素を含む原水を、まず、熱交換器１０に送り、熱交換によって７０°〜８０°程度に加温する。そして加温した後の原水をｐＨ調整槽２０に導入する。
【００２０】
ｐＨ調整槽２０では、導入された原水に対してｐＨ調整剤としての水酸化ナトリウム（ＮａＯＨ）などのアルカリを添加し、所定のｐＨ値（例えば１０．５程度）となるように、アルカリ性にｐＨ調整する。このように原水のｐＨ値をアルカリ性に調整することで、原水中に含まれるマグネシウムイオン（Ｍｇ2+）やカルシウムイオン（Ｃａ2+）などのアルカリ土類金属類が塩となりスケールとして析出する。
【００２１】
析出したスケールは沈殿物として回収できるため、アルカリを添加した原水は、撹拌されつつ凝集沈殿槽３０に送られ、凝集沈殿槽３０内で固液分離される。
【００２２】
凝集沈殿槽３０内で沈殿し分離されたスケールは、汚泥引き抜きポンプ６１にによって凝集沈殿槽３０底部から引き抜かれるが、引き抜いた汚泥の一部は分岐配管７１を経由させて、ｐＨ調整槽２０内に再導入する。このようにして導入した汚泥は種汚泥として作用し、凝集沈殿槽３０内でのスケールの成長を促すように作用する。
【００２３】
一方、凝集沈殿槽３０においてスケールが分離された後の上澄み液となった原水は、フィード液受層４０に送られた後、フィードポンプ６２によってストリッピング塔５０の塔頂に供給される。ストリッピング塔５０内には塔下部から蒸気が導入されており、塔頂から供給された原水が蒸気と接触して、原水からアンモニアガスがストリッピング（放散）される。ストリピングされたアンモニアガスは、循環ブロワ６３によってストリッピング塔５０の塔頂から吸引された後、図示しないアンモニアガス処理設備において触媒燃焼処理される。
【００２４】
また、ストリッピング塔５０においてストリッピング処理を受けた後の処理水は１００℃程度の高温度であり、この高温度の処理水を処理水ポンプ６４によって熱交換器１０に送り、原水を加温する熱源として利用することで熱回収を行う。熱交換器１０を経由した処理水は、図示しない中和処理設備において、酸を添加することにより中和処理する。また、処理水にはアルカリが含まれているため、熱交換器１０を経由した処理水の一部を、分岐配管７２によってｐＨ調整槽２０内に導入する。これにより、ｐＨ調整槽２０内に導入したアルカリを回収して再利用することができる。なお、熱交換器１０へ流入前の処理水を、ｐＨ調整槽２０に供給することもできる。
【００２５】
このように構成する排水処理システム（本システム）と図３に示した従来の排水処理システム（従来システム）の双方において、２５ｇ／ｌのアンモニア態窒素と、高濃度のアルカリ土類金属として０．１ｇ／ｌのカルシウムイオンとを含む原水を処理した。その結果、従来システムにおける、熱交換器１３０と放散塔１４０との間の配管１６０が、稼働１日で目詰まりを生じたが、本システムでは、同じ稼働日数においても、フィード液受層４０とストリッピング塔５０との間の配管には、スケールによる目詰まりが発生せず、３０日間の連続して稼働させることができ、本システムのプロセス性能が安定して維持できることが確認できた。
【００２６】
また、ｐＨ調整槽２０に導入する前に原水を加温することなく、図２に示すように、ｐＨ調整槽２０内に配設したスチーム配管８０によって、ｐＨ調整時に原水等を加熱する構成を試みた。しかし、加熱により溶解度が低下することに起因して、スチーム配管８０の配管表面にスケールが付着堆積して、スチーム配管８０による加熱効率が著しく低下してしまい、実用に耐えないことが確認できた。
【００２７】
以上説明した実施形態では、熱交換器１０を用いて原水を加温する構成を例示したが、この例に限定するものではなく、ヒータ等の所定の加熱機構によって、ｐＨ調整槽２０へ導入前の原水を加温する構成であればよい。
【００２８】
【発明の効果】
以上説明したように、請求項１〜３にかかる窒素含有排水処理システムによれば、窒素含有排水をアルカリ性に調整する調整手段に導入する前に、窒素含有排水を加温する加温手段を備える構成を採用してので予め加温手段によって加温された窒素含有排水が、調整手段、固液分離手段を介し、比較的高い温度のまま放散手段まで送ることができ、しかも固液分離手段以降の処理で加温されることがないため、温度上昇に伴って溶解度が低下する特性を有するスケールであっても、固液分離手段と放散手段との間の配管や放散手段での、スケールの発生を抑制することが可能となる。これにより、温度上昇に伴って溶解度が低下する特性を有するスケールであっても、固液分離手段以外でのスケールの発生を抑えて、排水処理システムのプロセス性能を安定して維持することができる。
【図面の簡単な説明】
【図１】実施形態にかかる窒素含有排水処理システムを示すブロック図である。
【図２】ｐＨ調整層内にスチーム配管を配設した状態を示す説明図である。
【図３】従来の窒素含有排水処理システムを示すブロック図である。
【符号の説明】
１０…熱交換器（加温手段）、２０…ｐＨ調整層（調整手段）
３０…凝集沈殿層（固液分離手段）、５０…ストリッピング塔（放散手段）
７１…分岐配管（第１導入手段）、７２…分岐配管（第２導入手段）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nitrogen-containing wastewater treatment system and a nitrogen-containing wastewater treatment method for removing nitrogen contained in wastewater in thermal power generation equipment, wastewater in sewage / sewage treatment equipment, wastewater in industrial wastewater treatment equipment, and the like.
[0002]
[Prior art]
An example of a conventional wastewater treatment system for treating nitrogen-containing wastewater is shown in FIG.
[0003]
The nitrogen-containing wastewater to be treated is sent to the pH adjusting tank 110, where slaked lime (Ca (OH) 2 ) is added and the pH is adjusted to be alkaline so as to have a predetermined pH value. By this treatment, carbonate ions (CO 3 2− ) and the like contained in the nitrogen-containing wastewater react with calcium ions (Ca 2+ ) to form salts and precipitate as scales.
[0004]
Since the deposited scale can be recovered as a precipitate, it is sent to the coagulation sedimentation tank 120 for solid-liquid separation. Here, the nitrogen-containing waste water separated from the scale is discharged from the coagulation sedimentation tank 120 and supplied to the top of the stripping tower 140 in a heated state via the heat exchanger 130. In the stripping tower 140, the nitrogen-containing waste water is brought into contact with steam to diffuse ammonia. The exhaust gas from the top of the stripping tower 140 is sent to a predetermined exhaust gas treatment facility 150, where the ammonia content in the exhaust gas is removed and recovered. On the other hand, the diffusion treated water that has undergone the radiation treatment in the radiation tower 140 is supplied to the heat exchange 130 as a heat source, and then subjected to a predetermined neutralization treatment in the neutralization treatment facility 170.
[0005]
[Problems to be solved by the invention]
However, since the scale deposited here has a property that the solubility decreases as the temperature rises, the nitrogen-containing waste water flowing out from the coagulation sedimentation tank 120 is heated by the heat exchanger 130, so that The solubility is lowered and scale is deposited in the waste water, and the deposited scale adheres to the inside of the pipe 160 and the diffusion tower 140 after the heat exchanger 130. As a result, the piping 160 between the heat exchanger 130 and the stripping tower 140 is easily clogged with a scale, and when one end is clogged, a cleaning operation for cleaning the piping 160 with an acid or the piping 160 is performed. Replacement work is required.
[0006]
Furthermore, when treating nitrogen-containing wastewater containing a high concentration of alkali metals or alkaline earth metals that cause such scales, this phenomenon will be exacerbated for cleaning operations, etc. In addition, the operation of the wastewater treatment system must be stopped every few days, making it difficult to maintain stable process performance.
[0007]
The present invention has been made to solve such problems. The purpose of the present invention is to generate scales other than the above-described coagulating sedimentation tanks, even if the scale has a characteristic that the solubility decreases with increasing temperature. The present invention provides a nitrogen-containing wastewater treatment system and a nitrogen-containing wastewater treatment method that can stably maintain the process performance of the wastewater treatment system.
[0008]
[Means for Solving the Problems]
Therefore, a nitrogen-containing wastewater treatment system according to claim 1 is a nitrogen-containing wastewater treatment system that removes nitrogen from nitrogen-containing wastewater, a heating means that heats the nitrogen-containing wastewater from which nitrogen is to be removed, and heating An alkali is added to the nitrogen-containing wastewater that has been heated through the means, the adjusting means for adjusting the nitrogen-containing wastewater to a predetermined alkalinity, and the insoluble salt from the nitrogen-containing wastewater adjusted to be alkaline by the adjusting means Solid-liquid separation means that separates the nitrogen-containing wastewater from which the insoluble salt has been separated by the solid-liquid separation means, and a diffusion means that diffuses ammonia from the nitrogen-containing wastewater by bringing the nitrogen-containing wastewater into contact with a predetermined diffusion gas. And a first introduction means for introducing the insoluble salt separated by the solid-liquid separation means into the adjustment means .
[0009]
In order to dissipate ammonia efficiently, it is desirable to introduce nitrogen-containing waste water having a higher temperature than normal temperature into the dissipating means. In this respect, by configuring the waste water treatment system in this way, The heated nitrogen-containing wastewater can be sent to the dissipating means at a relatively high temperature via the adjusting means and the solid-liquid separating means. And since it is not heated in the processing after the solid-liquid separation means, even if it is a scale having the characteristic that the solubility decreases with the temperature rise, the pipe between the solid-liquid separation means and the diffusion means The generation of scale in the diffusion means can be suppressed.
[0010]
The nitrogen-containing wastewater treatment system according to claim 2 is the nitrogen-containing wastewater treatment system according to claim 1, wherein the heating means is a heat exchange means for exchanging heat with the diffused treated water after the ammonia is diffused by the diffuser. is there.
[0011]
Thus, by comprising a heating means with the heat exchange means which uses the diffusion process water as a heat source, heat recovery can be performed and waste heat can be used effectively.
[0013]
Further, in the nitrogen-containing wastewater treatment system according to claim 1, the insoluble salt separated by the solid-liquid separation unit is again introduced into the adjustment unit by the first introduction unit, so that the insoluble salt introduced into the adjustment unit is seeded. Thus, the insoluble salt grows around this species, so that the growth of the insoluble salt is promoted. By this action, the insoluble salt becomes larger particles and is easily settled and separated in the solid-liquid separation means.
[0014]
A nitrogen-containing wastewater treatment system according to a third aspect of the present invention is the nitrogen-containing wastewater treatment system according to claim 1, further comprising second introduction means for introducing the diffused treated water after ammonia has been diffused by the diffuser means into the adjusting means. Configure.
[0015]
Since the diffusion treatment water contains alkali added by the adjustment means, the alkali added to the adjustment means can be recovered and reused by introducing the diffusion treatment water into the adjustment means by the second introduction means.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0019]
FIG. 1 shows a wastewater treatment system for nitrogen-containing wastewater (hereinafter referred to as “raw water”) according to the embodiment. The raw water containing ammonia nitrogen is first sent to the heat exchanger 10 and heated to about 70 ° to 80 ° by heat exchange. Then, the heated raw water is introduced into the pH adjustment tank 20.
[0020]
In the pH adjusting tank 20, an alkali such as sodium hydroxide (NaOH) as a pH adjusting agent is added to the introduced raw water so that the pH becomes alkaline so that a predetermined pH value (for example, about 10.5) is obtained. adjust. In this way, by adjusting the pH value of the raw water to be alkaline, alkaline earth metals such as magnesium ions (Mg 2+ ) and calcium ions (Ca 2+ ) contained in the raw water become salts and precipitate as scales.
[0021]
Since the deposited scale can be recovered as a precipitate, the raw water to which the alkali is added is sent to the coagulation sedimentation tank 30 while being stirred, and is solid-liquid separated in the coagulation sedimentation tank 30.
[0022]
The scale settled and separated in the coagulation sedimentation tank 30 is extracted from the bottom of the coagulation sedimentation tank 30 by the sludge extraction pump 61, but a part of the extracted sludge passes through the branch pipe 71 to enter the pH adjustment tank 20. Reintroduced into The sludge thus introduced acts as seed sludge and acts to promote the growth of scale in the coagulation sedimentation tank 30.
[0023]
On the other hand, the raw water that has become the supernatant liquid after the scale is separated in the coagulation sedimentation tank 30 is sent to the feed liquid receiving layer 40 and then supplied to the top of the stripping tower 50 by the feed pump 62. Steam is introduced into the stripping tower 50 from the lower part of the tower, and the raw water supplied from the top of the tower comes into contact with the steam, and ammonia gas is stripped from the raw water. The stripped ammonia gas is sucked from the top of the stripping tower 50 by the circulation blower 63 and then subjected to catalytic combustion processing in an ammonia gas processing facility (not shown).
[0024]
The treated water after the stripping treatment in the stripping tower 50 has a high temperature of about 100 ° C., and this treated water at high temperature is sent to the heat exchanger 10 by the treated water pump 64 to heat the raw water. The heat is recovered by using it as a heat source. The treated water that has passed through the heat exchanger 10 is neutralized by adding an acid in a neutralization facility (not shown). Further, since the treated water contains alkali, a part of the treated water that has passed through the heat exchanger 10 is introduced into the pH adjusting tank 20 through the branch pipe 72. Thereby, the alkali introduced into the pH adjusting tank 20 can be recovered and reused. The treated water before flowing into the heat exchanger 10 can also be supplied to the pH adjustment tank 20.
[0025]
In both of the wastewater treatment system (this system) configured as described above and the conventional wastewater treatment system (conventional system) shown in FIG. 3, 25 g / l of ammonia nitrogen and 0. Raw water containing 1 g / l calcium ion was treated. As a result, the pipe 160 between the heat exchanger 130 and the diffusion tower 140 in the conventional system was clogged in one day of operation, but in this system, the feed liquid receiving layer 40 and It was confirmed that the piping between the stripping tower 50 was not clogged by scales and could be operated continuously for 30 days, and the process performance of this system could be stably maintained.
[0026]
Further, as shown in FIG. 2, the raw water is heated at the time of pH adjustment by the steam pipe 80 disposed in the pH adjustment tank 20 without heating the raw water before being introduced into the pH adjustment tank 20. Tried. However, it was confirmed that due to the decrease in solubility due to heating, scale was deposited and deposited on the surface of the steam pipe 80, and the heating efficiency of the steam pipe 80 was significantly reduced, impractical. .
[0027]
In the above-described embodiment, the configuration in which the raw water is heated using the heat exchanger 10 is illustrated, but the present invention is not limited to this example, and before introduction into the pH adjustment tank 20 by a predetermined heating mechanism such as a heater. Any raw material may be used if it is heated.
[0028]
【The invention's effect】
As described above, according to the nitrogen-containing wastewater treatment system according to claims 1 to 3 , the nitrogen-containing wastewater treatment system is provided with a heating means for heating the nitrogen-containing wastewater before being introduced into the adjusting means for adjusting the nitrogen-containing wastewater to be alkaline. Since the configuration is adopted, the nitrogen-containing wastewater that has been heated in advance by the heating means can be sent to the diffusion means at a relatively high temperature via the adjustment means and the solid-liquid separation means, and after the solid-liquid separation means Since the scale is not heated by this treatment, even if the scale has a characteristic that the solubility decreases as the temperature rises, the scale between the solid-liquid separation means and the diffusion means and the diffusion means Occurrence can be suppressed. Thereby, even if it is a scale which has the characteristic that a solubility falls with a temperature rise, generation | occurrence | production of a scale other than a solid-liquid separation means can be suppressed, and the process performance of a wastewater treatment system can be maintained stably. .
[Brief description of the drawings]
FIG. 1 is a block diagram showing a nitrogen-containing wastewater treatment system according to an embodiment.
FIG. 2 is an explanatory view showing a state in which a steam pipe is disposed in a pH adjustment layer.
FIG. 3 is a block diagram showing a conventional nitrogen-containing wastewater treatment system.
[Explanation of symbols]
10 ... heat exchanger (heating means), 20 ... pH adjustment layer (adjustment means)
30: Aggregation precipitation layer (solid-liquid separation means), 50 ... Stripping tower (dispersion means)
71: Branch piping (first introduction means), 72: Branch piping (second introduction means)

Claims (3)

窒素含有排水から窒素を除去する窒素含有排水処理システムであって、
窒素を除去すべき窒素含有排水を加温する加温手段と、
前記加温手段を介して加温された後の前記窒素含有排水に対してアルカリを添加し、この窒素含有排水を所定のアルカリ性に調整する調整手段と、
前記調整手段によってアルカリ性に調整された窒素含有排水から不溶性塩を分離する固液分離手段と、
前記固液分離手段によって前記不溶性塩が分離された後の窒素含有排水を、所定の放散用ガスと接触させることにより、この窒素含有排水からアンモニアを放散させる放散手段とを備え、
前記固液分離手段で分離された不溶性塩を、前記調整手段に導入する第１導入手段をさらに備える窒素含有排水処理システム。A nitrogen-containing wastewater treatment system for removing nitrogen from nitrogen-containing wastewater,
A heating means for heating the nitrogen-containing waste water from which nitrogen is to be removed;
Adjusting means for adding alkali to the nitrogen-containing wastewater after being heated through the heating means, and adjusting the nitrogen-containing wastewater to a predetermined alkalinity;
Solid-liquid separation means for separating insoluble salts from nitrogen-containing wastewater adjusted to be alkaline by the adjustment means;
The nitrogen-containing wastewater from which the insoluble salt has been separated by the solid-liquid separation means is provided with a diffusion means for releasing ammonia from the nitrogen-containing wastewater by bringing the nitrogen-containing wastewater into contact with a predetermined emission gas .
A nitrogen-containing wastewater treatment system further comprising first introduction means for introducing the insoluble salt separated by the solid-liquid separation means into the adjustment means . 前記加温手段は、前記放散手段によってアンモニアが放散された後の放散処理水と熱交換する熱交換手段である請求項１記載の窒素含有排水処理システム。  The nitrogen-containing wastewater treatment system according to claim 1, wherein the heating means is a heat exchange means for exchanging heat with the diffused treated water after ammonia is diffused by the diffuser. 前記放散手段によってアンモニアが放散された後の放散処理水を、前記調整手段に導入する第２導入手段をさらに備える請求項１記載の窒素含有排水処理システム。  2. The nitrogen-containing wastewater treatment system according to claim 1, further comprising a second introduction unit that introduces the diffusion treated water after ammonia is diffused by the diffusion unit into the adjustment unit.
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JPS50144267A (en) * 1974-05-11 1975-11-20
JPS5539218A (en) * 1978-09-12 1980-03-19 Kawasaki Steel Corp Method and device for preventing clogging of lime still in process for deammoniating waste liquor containing ammonium salt

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JPS5642360B2 (en) * 1974-01-21 1981-10-03
JPS5326273A (en) * 1976-08-24 1978-03-10 Kubota Ltd Treating method for waste solution

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Publication number Priority date Publication date Assignee Title
JPS50144267A (en) * 1974-05-11 1975-11-20
JPS5539218A (en) * 1978-09-12 1980-03-19 Kawasaki Steel Corp Method and device for preventing clogging of lime still in process for deammoniating waste liquor containing ammonium salt

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