JP2001276891A - System and method for nitrogen-containing drain treatment - Google Patents
System and method for nitrogen-containing drain treatmentInfo
- Publication number
- JP2001276891A JP2001276891A JP2000095081A JP2000095081A JP2001276891A JP 2001276891 A JP2001276891 A JP 2001276891A JP 2000095081 A JP2000095081 A JP 2000095081A JP 2000095081 A JP2000095081 A JP 2000095081A JP 2001276891 A JP2001276891 A JP 2001276891A
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- nitrogen
- containing wastewater
- treatment system
- wastewater treatment
- solid
- Prior art date
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- Physical Water Treatments (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[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。The present invention relates to a method for removing nitrogen contained in wastewater in a thermal power plant, wastewater in a sewage / sewage treatment facility, wastewater in an industrial wastewater treatment facility, and the like.
The present invention relates to a nitrogen-containing wastewater treatment system and a nitrogen-containing wastewater treatment method.
【０００２】[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。2. Description of the Related Art FIG. 3 shows an example of a conventional wastewater treatment system for treating nitrogen-containing wastewater.
【０００３】処理すべき窒素含有排水をｐＨ調整槽１１
０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。The nitrogen-containing wastewater to be treated is supplied to a pH adjusting tank 11.
0, and slaked lime (Ca (OH) 2 ) is added to adjust the pH to alkaline so as to obtain 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 scale.
【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１
４０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。[0004] Since the deposited scale can be recovered as a precipitate, it is sent to a coagulation sedimentation tank 120 for solid-liquid separation. The nitrogen-containing wastewater separated from the scale here flows out of the coagulation sedimentation tank 120 and is supplied to the top of the diffusion tower 140 while being heated via the heat exchanger 130. Dispersion tower 140
Inside, the nitrogen-containing wastewater is brought into contact with steam to release ammonia. The exhaust gas from the top of the stripping tower 140 is sent to a predetermined exhaust gas treatment facility 150, where ammonia in the exhaust gas is removed and collected. Meanwhile, stripping tower 1
The radiation treated water subjected to the radiation treatment in 40 is supplied to the heat exchange 130 as a heat source, and then subjected to a predetermined neutralization treatment in the neutralization treatment equipment 170.
【０００５】[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１４
０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。However, since the scale that precipitates here has the property that its solubility decreases as the temperature rises, the nitrogen-containing wastewater flowing out of the coagulation sedimentation tank 120 is removed by the heat exchanger 130. By being heated, the solubility of the scale is reduced, and the scale is precipitated in the wastewater.
Within 0, the deposited scale adheres.
As a result, in the pipe 160 between the heat exchanger 130 and the stripping tower 140, clogging due to scale is apt to occur. When one end is clogged, the pipe 160 is washed with an acid, or the pipe 160 is cleaned. Replacement work is required.
【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。Further, when treating a nitrogen-containing wastewater containing a high concentration of an alkali metal or an alkaline earth metal which causes the generation of such a scale, this phenomenon is exacerbated and the cleaning work is performed. For example, the operation of the wastewater treatment system must be stopped every few days,
It becomes even more difficult to maintain stable process performance.
【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。[0007] The present invention has been made to solve such a problem, and an object of the present invention is to provide a scale other than the above-mentioned coagulation sedimentation tank, even if the scale has a property of decreasing the solubility with an increase in temperature. An object of the present invention is to provide a nitrogen-containing wastewater treatment system and a nitrogen-containing wastewater treatment method that can suppress generation of scale and stably maintain the process performance of the wastewater treatment system.
【０００８】[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
散手段とを備えて構成する。Accordingly, a nitrogen-containing wastewater treatment system according to claim 1 is a nitrogen-containing wastewater treatment system for removing nitrogen from nitrogen-containing wastewater, wherein nitrogen-containing wastewater to be removed is added. Heating means for warming, adjusting means for adding alkali to the nitrogen-containing waste water after being heated through the heating means, adjusting the nitrogen-containing waste water to a predetermined alkalinity, The solid-liquid separation means for separating the insoluble salt from the adjusted nitrogen-containing wastewater, and the nitrogen-containing wastewater after the insoluble salt is separated by the solid-liquid separation means, are brought into contact with a predetermined gas for dispersing, thereby obtaining the nitrogen-containing wastewater. And a dissipating means for dissipating ammonia from the wastewater.
【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。In order to efficiently diffuse ammonia, it is desirable to introduce nitrogen-containing wastewater at a higher temperature than normal temperature into the emission means. The nitrogen-containing wastewater heated 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 since it is not heated in the processing after the solid-liquid separation means, even if the scale has the property that the solubility decreases with the temperature rise, the piping between the solid-liquid separation means and the emission means It is possible to suppress the generation of scale in the radiation means.
【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。[0010] In the nitrogen-containing wastewater treatment system according to a second aspect of the present invention, in the nitrogen-containing wastewater treatment system according to the first aspect, the heating means includes a heat exchanger for exchanging heat with the radiation treatment water after the ammonia has been diffused by the radiation means. It is an exchange means.
【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。As described above, the heating means is constituted by the heat exchange means using the treated water as a heat source, so that heat can be recovered and waste heat can be effectively used.
【００１２】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、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。A nitrogen-containing wastewater treatment system according to a third aspect is the nitrogen-containing wastewater treatment system according to the first aspect, further comprising first introduction means for introducing the insoluble salt separated by the solid-liquid separation means to the adjustment means. It is composed.
【００１３】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。[0013] By introducing the insoluble salt separated by the solid-liquid separation means into the adjusting means again by the first introducing means, the insoluble salt introduced into the adjusting means becomes a seed, and the insoluble salt grows around this seed. To promote the growth of insoluble salts. Due to this action, the insoluble salt becomes larger particles and is likely to settle and separate in the solid-liquid separation means.
【００１４】請求項４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。The nitrogen-containing wastewater treatment system according to a fourth aspect is the nitrogen-containing wastewater treatment system according to the first aspect, wherein the second introduction means for introducing the treated water after the ammonia has been diffused by the dispersion means into the adjusting means. Is further provided.
【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。Since the treated water contains the alkali added by the adjusting means, the alkali added to the adjusting means can be recovered and reused by introducing the treated water into the adjusting means by the second introducing means.
【００１６】請求項５にかかる窒素含有排水処理方法
は、窒素含有排水から窒素を除去する窒素含有排水処理
方法であって、窒素を除去すべき窒素含有排水を加温す
る加温工程と、加温工程を経た窒素含有排水にアルカリ
を添加し、この窒素含有排水を所定のアルカリ性に調整
する調整工程と、調整工程を経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工程
と、固液分離工程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
工程とを備える。A nitrogen-containing wastewater treatment method according to claim 5 is a nitrogen-containing wastewater treatment method for removing nitrogen from nitrogen-containing wastewater, comprising: a heating step of heating the nitrogen-containing wastewater from which nitrogen is to be removed; Adding an alkali to the nitrogen-containing wastewater that has passed through the temperature step, and adjusting the nitrogen-containing wastewater to a predetermined alkalinity; and a solid-liquid separation step that separates insoluble salts from the nitrogen-containing wastewater that has been adjusted to alkaline through the adjustment step. And a step of contacting the nitrogen-containing waste water from which the insoluble salt has been separated by the solid-liquid separation step with a predetermined gas for diffusion to thereby evaporate ammonia from the nitrogen-containing waste water.
【００１７】アンモニアを効率よく放散させるため、放
散工程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、この排水処理方法で
は、加温工程によって加温された窒素含有排水を、調整
工程、固液分離工程を経た後に、比較的高い温度のまま
放散工程まで送ることができる。そして、固液分離工程
以降の工程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、固液分離工程以外でのスケールの発生を抑制するこ
とができる。In order to efficiently diffuse ammonia, it is desirable to introduce a nitrogen-containing wastewater at a higher temperature than normal temperature in the emission step. In this regard, in this wastewater treatment method, the wastewater is heated by the heating step. After the nitrogen-containing wastewater has passed through the adjustment step and the solid-liquid separation step, it can be sent to the emission step at a relatively high temperature. And since it is not heated in the steps after the solid-liquid separation step, even if the scale has the property that the solubility decreases with the temperature rise, the generation of scales other than the solid-liquid separation step is suppressed. be able to.
【００１８】[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。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the accompanying drawings.
【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。FIG. 1 shows a wastewater treatment system for nitrogen-containing wastewater (hereinafter referred to as “raw water”) according to an embodiment. 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 adjusting tank 20.
【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。In the pH adjusting tank 20, sodium hydroxide (NaOH) as a pH adjusting agent is added to the introduced raw water.
Or the like, and a predetermined pH value (for example, 10.
PH is adjusted so as to be about 5). By adjusting the pH value of the raw water to alkaline in this way,
Alkaline earth metals such as magnesium ions (Mg 2+ ) and calcium ions (Ca 2+ ) contained in raw water turn into salts and precipitate as scales.
【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。Since the deposited scale can be recovered as a precipitate, the raw water to which the alkali has been added is sent to the coagulation / sedimentation tank 30 while being stirred, and solid-liquid separated in the coagulation / sedimentation tank 30.
【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。The scale settled and separated in the coagulation sedimentation tank 30 is pulled out from the bottom of the coagulation sedimentation tank 30 by a sludge drawing pump 61, and a part of the drawn sludge is passed through a branch pipe 71 to adjust the pH. Re-introduce into the tank 20. The sludge thus introduced acts as seed sludge and acts to promote the growth of scale in the coagulation sedimentation tank 30.
【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。On the other hand, the raw water that has become the supernatant liquid after the scale has been 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. You. Steam is introduced into the stripping tower 50 from the lower part of the tower, and the raw water supplied from the top comes into contact with the steam, and ammonia gas is stripped (dissipated) from the raw water. After the stripped ammonia gas is sucked from the top of the stripping tower 50 by the circulation blower 63, the stripped ammonia gas is subjected to catalytic combustion processing in an ammonia gas processing facility (not shown).
【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。The treated water after being subjected to the stripping treatment in the stripping tower 50 has a high temperature of about 100 ° C., and the high-temperature treated water is sent to the heat exchanger 10 by the treated water pump 64 and Heat recovery is performed by using as a heat source for heating. The treated water that has passed through the heat exchanger 10 is subjected to a neutralization treatment by adding an acid in a neutralization treatment facility (not shown). 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 adjustment tank 20 can be collected and reused. In addition, the treated water before flowing into the heat exchanger 10 can be supplied to the pH adjusting tank 20.
【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１
４０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。In both the wastewater treatment system (the present system) thus configured and the conventional wastewater treatment system (the conventional system) shown in FIG. 3, 25 g / l of ammonia nitrogen and high concentration of alkaline earth metal 0.1 g /
Raw water containing 1 liter of calcium ions was treated. As a result, in the conventional system, the heat exchanger 130 and the stripper 1
Although the pipe 160 between the feed liquid receiving layer 40 and the stripping tower 50 was clogged in one day of operation, the pipes between the feed liquid receiving layer 40 and the stripping tower 50 were not scaled even in the same number of operating days. It was confirmed that clogging did not occur, the system could be operated continuously for 30 days, and the process performance of this system could be stably maintained.
【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２
０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。Further, the raw water is not heated before being introduced into the pH adjusting tank 20, and as shown in FIG.
Attempts were made to heat raw water and the like during pH adjustment by means of a steam pipe 80 disposed in the chamber. However, due to the decrease in solubility due to heating, scale adheres and deposits on the pipe surface of the steam pipe 80, and the steam pipe 80
It was confirmed that the heating efficiency was remarkably reduced due to the heat treatment and was not practical.
【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。In the embodiment described above, the heat exchanger 10
Although the configuration in which the raw water is heated by using is exemplified, the present invention is not limited to this example, and any configuration may be used as long as the raw water before being introduced into the pH adjustment tank 20 is heated by a predetermined heating mechanism such as a heater. .
【００２８】[0028]
【発明の効果】以上説明したように、請求項１〜４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。As described above, according to the nitrogen-containing wastewater treatment system according to claims 1 to 4, the nitrogen-containing wastewater is heated before being introduced into the adjusting means for adjusting the nitrogen-containing wastewater to alkaline. Since the configuration including the heating means is adopted, the nitrogen-containing wastewater heated in advance by the heating means can be sent to the emission means at a relatively high temperature via the adjustment means and the solid-liquid separation means, and Since the scale is not heated in the processing after the solid-liquid separation means, even if the scale has a characteristic that the solubility decreases with an increase in temperature, the piping and the emission means between the solid-liquid separation means and the emission means , The occurrence of scale can be suppressed. This allows
Even in the case of a scale having a characteristic that the solubility decreases with an increase in temperature, generation of scale other than solid-liquid separation means can be suppressed, and the process performance of the wastewater treatment system can be stably maintained.
【００２９】また、請求項５にかかる窒素含有排水処理
方法は、窒素含有排水をアルカリ性に調整する調整工程
の前に、窒素含有排水を加温する加温工程を実施するた
め、窒素含有排水を、調整工程、固液分離工程を経て、
比較的高い温度のまま放散工程まで送ることができ、し
かも、固液分離工程以降の工程で窒素含有排水が加温さ
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、固液分離工程以外
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、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。Further, in the method for treating nitrogen-containing wastewater according to claim 5, the nitrogen-containing wastewater is heated before the adjusting step of adjusting the nitrogen-containing wastewater to alkaline. , Through the adjustment process and the solid-liquid separation process,
A scale that can be sent to the emission step at a relatively high temperature, and the solubility decreases as the temperature rises because the nitrogen-containing wastewater is not heated in the steps after the solid-liquid separation step. Even in this case, it is possible to suppress the generation of scales other than in the solid-liquid separation step. Thereby, even if the scale has a characteristic that the solubility decreases as the temperature increases, the process performance of the wastewater treatment system can be stably maintained.
【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。FIG. 1 is a block diagram showing a nitrogen-containing wastewater treatment system according to an embodiment.
【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。FIG. 2 is an explanatory diagram showing a state in which a steam pipe is provided in a pH adjustment layer.
【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。FIG. 3 is a block diagram showing a conventional nitrogen-containing wastewater treatment system.
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）DESCRIPTION OF SYMBOLS 10 ... Heat exchanger (heating means), 20 ... pH adjustment layer (adjustment means) 30 ... Coagulated sedimentation layer (solid-liquid separation means), 50 ... Stripping tower (dissipation means) 71 ... Branch pipe (first introduction means) ), 72 ... branch pipe (second introduction means)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ０１Ｄ 9/02 ６０１ Ｂ０１Ｄ 9/02 ６０１Ｂ ６０２ ６０２Ｅ ６０８ ６０８Ａ ６１５ ６１５Ｚ Ｃ０２Ｆ 1/20 ＺＡＢ Ｃ０２Ｆ 1/20 ＺＡＢＢ 1/58 ＣＤＪ 1/58 ＣＤＪＰ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) B01D 9/02 601 B01D 9/02 601B 602 602E 608 608A 615 615Z C02F 1/20 ZAB C02F 1/20 ZABB 1 / 58 CDJ 1/58 CDJP
Claims (5)
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
放散手段とを備えた窒素含有排水処理システム。1. A nitrogen-containing wastewater treatment system for removing nitrogen from nitrogen-containing wastewater, wherein the heating means heats the nitrogen-containing wastewater from which nitrogen is to be removed, and is heated via the heating means. Adjusting means for adding alkali to the subsequent nitrogen-containing wastewater to adjust the nitrogen-containing wastewater to a predetermined alkalinity; and solid-liquid separation for separating insoluble salts from the nitrogen-containing wastewater adjusted to alkaline by the adjusting means. Nitrogen, comprising: a nitrogen-containing wastewater after the insoluble salt is separated by the solid-liquid separation means, and a release means for releasing ammonia from the nitrogen-containing wastewater by contacting the wastewater with a predetermined gas for diffusion. Contained wastewater treatment system.
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。2. The nitrogen-containing wastewater treatment system according to claim 1, wherein the heating means is a heat exchange means for exchanging heat with the treated water after the ammonia has been diffused by the radiation means.
を、前記調整手段に導入する第１導入手段をさらに備え
る請求項１記載の窒素含有排水処理システム。3. The nitrogen-containing wastewater treatment system according to claim 1, further comprising a first introduction unit that introduces the insoluble salt separated by the solid-liquid separation unit into the adjustment unit.
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。4. The method according to claim 2, wherein the treated water after the ammonia has been diffused by the radiation means is introduced into the adjusting means.
The nitrogen-containing wastewater treatment system according to claim 1, further comprising an introduction means.
有排水処理方法であって、 窒素を除去すべき窒素含有排水を加温する加温工程と、 前記加温工程を経た窒素含有排水にアルカリを添加し、
この窒素含有排水を所定のアルカリ性に調整する調整工
程と、 前記調整工程を経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工程と、 前記固液分離工程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
放散工程とを備えた窒素含有排水処理方法。5. A nitrogen-containing wastewater treatment method for removing nitrogen from nitrogen-containing wastewater, comprising: a heating step of heating the nitrogen-containing wastewater from which nitrogen is to be removed; And add
An adjusting step of adjusting the nitrogen-containing wastewater to a predetermined alkalinity; a solid-liquid separation step of separating an insoluble salt from the nitrogen-containing wastewater adjusted to be alkaline through the adjusting step; and A nitrogen-containing wastewater treatment method, comprising: bringing the separated nitrogen-containing wastewater into contact with a predetermined gas for diffusion to thereby diffuse ammonia from the nitrogen-containing wastewater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000095081A JP4485007B2 (en) | 2000-03-30 | 2000-03-30 | Nitrogen-containing wastewater treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000095081A JP4485007B2 (en) | 2000-03-30 | 2000-03-30 | Nitrogen-containing wastewater treatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001276891A true JP2001276891A (en) | 2001-10-09 |
| JP4485007B2 JP4485007B2 (en) | 2010-06-16 |
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ID=18610030
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|---|---|---|---|
| JP2000095081A Expired - Fee Related JP4485007B2 (en) | 2000-03-30 | 2000-03-30 | Nitrogen-containing wastewater treatment system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100508857B1 (en) * | 2003-06-30 | 2005-08-17 | 재단법인 포항산업과학연구원 | System for removing ammonia in waste water |
| JP2010094650A (en) * | 2008-10-20 | 2010-04-30 | Chugoku Electric Power Co Inc:The | Method for removing adhesive material in denitrification apparatus |
| CN116462380A (en) * | 2023-06-20 | 2023-07-21 | 世韩(天津)节能环保科技有限公司 | Catalyst wastewater treatment system |
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|---|---|---|---|---|
| JPS50103164A (en) * | 1974-01-21 | 1975-08-14 | ||
| JPS50144267A (en) * | 1974-05-11 | 1975-11-20 | ||
| JPS5326273A (en) * | 1976-08-24 | 1978-03-10 | Kubota Ltd | Treating method for waste solution |
| 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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2000
- 2000-03-30 JP JP2000095081A patent/JP4485007B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50103164A (en) * | 1974-01-21 | 1975-08-14 | ||
| JPS50144267A (en) * | 1974-05-11 | 1975-11-20 | ||
| JPS5326273A (en) * | 1976-08-24 | 1978-03-10 | Kubota Ltd | Treating method for waste solution |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100508857B1 (en) * | 2003-06-30 | 2005-08-17 | 재단법인 포항산업과학연구원 | System for removing ammonia in waste water |
| JP2010094650A (en) * | 2008-10-20 | 2010-04-30 | Chugoku Electric Power Co Inc:The | Method for removing adhesive material in denitrification apparatus |
| CN116462380A (en) * | 2023-06-20 | 2023-07-21 | 世韩(天津)节能环保科技有限公司 | Catalyst wastewater treatment system |
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| Publication number | Publication date |
|---|---|
| JP4485007B2 (en) | 2010-06-16 |
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