JPH0688034B2 - Biological denitrification method and apparatus - Google Patents
Biological denitrification method and apparatusInfo
- Publication number
- JPH0688034B2 JPH0688034B2 JP3031330A JP3133091A JPH0688034B2 JP H0688034 B2 JPH0688034 B2 JP H0688034B2 JP 3031330 A JP3031330 A JP 3031330A JP 3133091 A JP3133091 A JP 3133091A JP H0688034 B2 JPH0688034 B2 JP H0688034B2
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- denitrification
- hydrogen sulfide
- liquid
- agent injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims description 25
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 74
- 239000007788 liquid Substances 0.000 claims description 47
- 239000003638 chemical reducing agent Substances 0.000 claims description 39
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 33
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 33
- 238000002347 injection Methods 0.000 claims description 31
- 239000007924 injection Substances 0.000 claims description 31
- 229910052717 sulfur Inorganic materials 0.000 claims description 13
- 239000011593 sulfur Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 17
- -1 sulfur ions Chemical class 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 241000894006 Bacteria Species 0.000 description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000010802 sludge Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 230000001546 nitrifying effect Effects 0.000 description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 4
- 239000013535 sea water Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 239000000227 bioadhesive Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010800 human waste Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241001148470 aerobic bacillus Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、上水，下水，し尿，用
水，海水，廃水等の液中に含有される窒素酸化物、ある
いはそれらの液の処理過程で生ずる窒素酸化物を生物学
的に還元脱窒処理する方法及びその装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to nitrogen oxides contained in liquids such as tap water, sewage, human waste, irrigation water, sea water and waste water, or nitrogen oxides produced during the treatment of these liquids. TECHNICAL FIELD The present invention relates to a method and an apparatus for a reductive denitrification process.
【０００２】[0002]
【従来の技術】従来、液中の窒素酸化物を生物学的に還
元脱窒する技術として、活性汚泥方式によるもの、微生
物（脱窒菌）を生物付着媒体の表面に付着して固定化あ
るいは樹脂等によって包括固定した固定化脱窒菌を利用
した方式が知られている。ところで、液中の窒素酸化物
を生物学的に還元脱窒処理する場合、経済的かつ合理的
な処理を行なうためには、脱窒工程に流入する窒素酸化
物の変動に対応して適切な量の還元剤を注入することが
必要である。2. Description of the Related Art Conventionally, as a technique for biologically reducing and denitrifying nitrogen oxides in a liquid, an activated sludge method is used, and microorganisms (denitrifying bacteria) are attached to the surface of a bio-adhesive medium to be immobilized or A method using immobilized denitrifying bacteria that are entrapped and fixed by the above method is known. By the way, when biologically reducing and denitrifying nitrogen oxides in a liquid, in order to carry out economical and rational treatment, it is necessary to respond appropriately to fluctuations of nitrogen oxides flowing into the denitrification process. It is necessary to inject a quantity of reducing agent.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、実際に
は、還元剤の注入量の制御は行なわず、安全のために脱
窒工程流入酸化窒素に対してやや過剰量の還元剤を注入
することが行なわれていた。そのため、負荷変動などに
よって流入窒素酸化物が減少した時には、大過剰の還元
剤が注入されることになり、不経済であったばかりでな
く、脱窒工程の嫌気度が進み過ぎて脱窒菌の活性が低下
するという弊害を生じ、かつ処理液も悪化するという問
題があった。本発明は、還元剤注入量が過剰になると硫
化水素，硫黄イオンが発生するという知見に基づいてな
されたもので、前記問題点を解消し、還元剤注入量を適
正に制御し、経済的に良質な処理液を得ることができる
生物学的脱窒方法及びその装置を提供することを目的と
するものである。However, in practice, the injection amount of the reducing agent is not controlled, and it is possible to inject a slightly excessive amount of the reducing agent with respect to the nitric oxide flowing into the denitrification process for safety. It was being done. Therefore, when the inflowing nitrogen oxides decrease due to load fluctuations, etc., a large excess of reducing agent will be injected, which is not only uneconomical, but also the anaerobic degree of the denitrification process has progressed too much and the activity of denitrifying bacteria has been increased. However, there is a problem in that the processing liquid deteriorates. The present invention was made based on the knowledge that hydrogen sulfide and sulfur ions are generated when the reducing agent injection amount becomes excessive, and the above problems are solved, the reducing agent injection amount is properly controlled, and economically. It is an object of the present invention to provide a biological denitrification method and an apparatus therefor capable of obtaining a high-quality treatment liquid.
【０００４】[0004]
【課題を解決するための手段】本発明は、窒素酸化物含
有液に還元剤を注入して液中の窒素酸化物を脱窒工程で
生物学的に還元脱窒する方法において、前記脱窒工程気
相部の硫化水素濃度，脱窒工程流出液の硫黄イオン濃
度，脱窒工程流出液の硫化水素濃度の少なくとも一つを
検出し、その検出値に基づいて還元剤注入量を制御する
ことを特徴とする生物学的脱窒方法であり、また還元剤
注入設備を備え、液中の窒素酸化物を生物学的に還元脱
窒する脱窒槽の気相部に硫化水素検出装置を連結し、該
硫化水素検出装置をその検出値により還元剤注入量を制
御する演算制御回路を介して前記還元剤注入設備に連結
したことを特徴とする装置であり、さらに、還元剤注入
設備を備え、液中の窒素酸化物を生物学的に還元脱窒す
る脱窒槽の脱窒処理液流出経路に硫黄イオン及び又は硫
化水素の検出装置を設け、これらの検出装置をその検出
値により還元剤注入量を制御する演算制御回路を介して
前記還元剤注入設備に連結したことを特徴とする装置で
ある。The present invention provides a method for biologically reducing and denitrifying nitrogen oxides in a liquid by injecting a reducing agent into a liquid containing nitrogen oxides in a denitrification step. At least one of the hydrogen sulfide concentration in the process gas phase, the sulfur ion concentration in the denitrification process effluent, and the hydrogen sulfide concentration in the denitrification process effluent is detected, and the reducing agent injection amount is controlled based on the detected values. A biological denitrification method characterized by the above, and also equipped with a reducing agent injection facility, with a hydrogen sulfide detection device connected to the gas phase part of the denitrification tank for biologically reducing and denitrifying nitrogen oxides in the liquid. A device characterized in that the hydrogen sulfide detection device is connected to the reducing agent injection equipment via an arithmetic control circuit that controls the reducing agent injection amount according to the detected value, and further comprises a reducing agent injection equipment, Denitrification treatment of denitrification tank for biologically reducing and denitrifying nitrogen oxides in liquid A detection device for sulfur ions and / or hydrogen sulfide is provided in the outflow route, and these detection devices are connected to the reducing agent injection facility through an arithmetic control circuit for controlling the reducing agent injection amount according to the detected value. It is a device.
【０００５】[0005]
【作用】本発明の対象となる液は、窒素酸化物を含有す
る液、あるいは液中のＮＨ3 −Ｎを予め好気的条件下に
ある硝化工程によって硝酸等の窒素酸化物に酸化した液
であり、これらの液にメタノール，エタノール，プロピ
ルアルコール等の還元剤を注入し、活性汚泥を利用した
り、嫌気的条件下にある活性炭，砂，ハニカムチューブ
等の生物付着媒体の表面に付着させて固定化した脱窒
菌，あるいはポリビニール樹脂等によって包括固定化し
た脱窒菌を利用した脱窒工程に導き、液中の窒素酸化物
が窒素ガスに還元され脱窒される。この時、脱窒工程の
気相部における硫化水素濃度，脱窒工程から流出する脱
窒処理液中の硫黄イオン濃度，硫化水素濃度の少なくと
も一つを検出し、その検出信号が演算制御回路に入力さ
れ、設定された各濃度と比較演算されたのち、還元剤の
注入量が制御される。この場合の設定された各濃度と
は、実験あるいは運転初期において還元剤が過不足なく
注入された場合の硫化水素濃度，硫黄イオン濃度であ
る。還元剤注入量と発生する硫化水素，硫黄イオン濃度
とは相関関係があり、還元剤注入量が過剰になると硫化
水素，硫黄イオンが発生するのは、窒素酸化物の結合状
酸素が消失すると脱窒工程が完全な嫌気状態となって、
通性好気性菌である脱窒菌の一部が死に、腐敗したこと
によると考えられる。脱窒される窒素酸化物に硫黄イオ
ンが含有されている場合には、硫化水素の発生がさらに
顕著になるが、これは脱窒菌が腐敗する前に共存する硫
酸還元菌が、窒素酸化物が消失すると還元剤を利用して
硫酸イオンを硫黄イオン、さらには硫化水素にまで還元
するからである。従って、し尿の酸化処理液（硝化液）
や海水などのように硫酸イオンを含有する液の脱窒処理
には本発明は特に有効である。The liquid which is the subject of the present invention is a liquid containing nitrogen oxides, or a liquid obtained by previously oxidizing NH 3 -N in the liquid to nitrogen oxides such as nitric acid by a nitrification step under aerobic conditions. Injecting a reducing agent such as methanol, ethanol, propyl alcohol, etc. into these liquids to utilize activated sludge or to attach it to the surface of bio-adhesive media such as activated carbon, sand, and honeycomb tubes under anaerobic conditions. The nitrogen oxide in the liquid is reduced to nitrogen gas and denitrified by introducing into the denitrification process using the denitrifying bacterium immobilized by the above method or the denitrifying bacterium entrapped and immobilized by polyvinyl resin or the like. At this time, at least one of the hydrogen sulfide concentration in the gas phase portion of the denitrification process, the sulfur ion concentration in the denitrification treatment liquid flowing out from the denitrification process, and the hydrogen sulfide concentration is detected, and the detection signal is sent to the arithmetic control circuit. After being input and compared with each set concentration, the injection amount of the reducing agent is controlled. The respective set concentrations in this case are the hydrogen sulfide concentration and the sulfur ion concentration when the reducing agent is injected without excess or deficiency in the experiment or the initial stage of operation. There is a correlation between the reducing agent injection amount and the generated hydrogen sulfide and sulfur ion concentrations. When the reducing agent injection amount becomes excessive, hydrogen sulfide and sulfur ions are generated when the bound oxygen of nitrogen oxides disappears. The nitriding process became completely anaerobic,
It is considered that some of the denitrifying bacteria, which are facultative aerobic bacteria, died and rotted. When sulfur oxides are contained in the nitrogen oxides to be denitrified, the generation of hydrogen sulfide becomes more remarkable. This is because the sulfate-reducing bacteria coexisting before the denitrifying bacteria decompose, This is because when it disappears, a reducing agent is used to reduce sulfate ions to sulfur ions and further to hydrogen sulfide. Therefore, human waste oxidation treatment liquid (nitrification liquid)
The present invention is particularly effective for the denitrification treatment of a liquid containing sulfate ion such as seawater and seawater.
【０００６】[0006]
【実施例】本発明の装置の実施例を図面を参照して説明
する。図１において、１1 は攪拌機２を備えた脱窒槽
で、ブロワ３に連なる硝化槽４1 で好気的条件下で液中
のＮＨ3 −Ｎが硝酸等に酸化された硝化液、その他の窒
素酸化物含有液流入管５が連結され、この窒素酸化物含
有液流入管５からの流入液にメタノール，エタノール，
プロピルアルコール等の還元剤６を注入する還元剤注入
設備７が備えられている。脱窒槽１に還元剤６と共に流
入した窒素酸化物含有液は、嫌気的条件下で攪拌されて
液中の窒素酸化物が窒素ガスに還元脱窒され、その脱窒
処理液は脱窒処理液流出管８から流出するようになって
いるが、脱窒槽１の気相部には放散される硫化水素濃度
を検出する分析計９1 が連結されている。さらに、この
分析計９1 は演算制御回路１０に連結され、分析計９1
で検出された硫化水素濃度の検出値が演算制御回路１０
に入力され、設定された硫化水素濃度と比較演算された
のち、還元剤注入設備７による還元剤注入量を制御する
ように演算制御回路１０と還元剤注入設備７とが連結さ
れている。また、図１中に２点鎖線で示したように、脱
窒処理液流出管８に脱窒処理液中の硫黄イオン濃度及び
又は硫化水素濃度を検出する分析計９2 を連結し、さら
にこの分析計９2 を演算制御回路１０に連結して、脱窒
処理液中の硫黄イオン濃度や硫化水素濃度によって還元
剤注入量を制御することもできる。図１中、１１は脱窒
処理液流出管８に連なる沈殿槽で、１２は沈殿槽１１か
ら硝化槽４に連なる汚泥返送管を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device of the present invention will be described with reference to the drawings. In Figure 1, 1 1 in the denitrification tank equipped with a stirrer 2, NH 3 -N nitrified liquid is oxidized within nitric acid in the liquid under aerobic conditions in the nitrification tank 4 1 connected to the blower 3, other The nitrogen oxide-containing liquid inflow pipe 5 is connected to the inflow liquid from the nitrogen oxide-containing liquid inflow pipe 5, and methanol, ethanol,
A reducing agent injection facility 7 for injecting a reducing agent 6 such as propyl alcohol is provided. The nitrogen oxide-containing liquid that has flown into the denitrification tank 1 together with the reducing agent 6 is stirred under anaerobic conditions to reduce the nitrogen oxides in the liquid to denitrification nitrogen gas, and the denitrification treatment liquid is the denitrification treatment liquid. and then it flows out from the outflow pipe 8, but analyzer 9 1 in the gas phase portion of the denitrification tank 1 for detecting the concentration of hydrogen sulfide to be dissipated is connected. Further, the analyzer 9 1 is connected to the arithmetic and control circuit 10, and the analyzer 9 1
The detected value of the hydrogen sulfide concentration detected by the calculation control circuit 10
The calculation control circuit 10 and the reducing agent injection equipment 7 are connected so as to control the amount of the reducing agent injection by the reducing agent injection equipment 7 after being input to and calculated and compared with the set hydrogen sulfide concentration. Further, as shown by a two-dot chain line in FIG. 1, it connects the analyzer 9 2 for detecting the sulfur ion concentration and or hydrogen sulfide concentration in the denitrified liquid outflow pipe 8 to the denitrification treatment solution, further the the analyzer 9 2 linked to the calculation control circuit 10 may control the reducing agent injection amount by a sulfur ion concentration and the concentration of hydrogen sulfide in denitrified liquid. In FIG. 1, 11 is a settling tank connected to the denitrification treatment solution outflow pipe 8, and 12 is a sludge return pipe connected from the precipitation tank 11 to the nitrification tank 4.
【０００７】また、硫化水素は揮発するから、脱窒処理
液をエアレーションして硫化水素を液中からストリッピ
ングして検出すると、液中の硫化水素を検出するよりも
容易である。この場合の例を図２に基づいて説明する。
図２では、脱窒槽１2 には脱窒菌を付着、固定化した粒
径３〜４ｍｍ程度のアンスラサイト１３が充填されたも
のを用い、硝化槽４2 にはハニカムチューブ１４が充填
されたものを用いている。そして、図１の例のように脱
窒槽１2 の脱窒処理液流出管８から流出する脱窒処理液
中の硫化水素を検出することができるが、脱窒処理液流
出管８を硫化水素放散槽１５に連結し、硫化水素放散槽
１５に流入した脱窒処理液をブロワ３からの散気によっ
て液中から硫化水素を放散し、この硫化水素を分析計９
2 で検出し、この検出値を演算制御回路１０に入力す
る。Further, since hydrogen sulfide is volatilized, it is easier to detect hydrogen sulfide in the liquid by aerating the denitrification treatment liquid and stripping and detecting hydrogen sulfide from the liquid. An example of this case will be described with reference to FIG.
In Figure 2, the denitrification tank 1 second attachment denitrifying bacteria, using what anthracite 13 a diameter of about 3~4mm immobilized filled, as the nitrification tank 4 2 honeycomb tube 14 is filled Is used. Then, it is possible to detect the hydrogen sulfide in the denitrified liquid flowing out from the denitrification tank 1 2 denitrified liquid outflow pipe 8 as in the example of FIG. 1, the hydrogen sulfide denitrified liquid outflow pipe 8 The denitrification treatment liquid, which is connected to the diffusion tank 15 and has flowed into the hydrogen sulfide diffusion tank 15, diffuses hydrogen sulfide from the liquid by the diffuser from the blower 3, and the hydrogen sulfide is analyzed by an analyzer 9
The value is detected in 2 , and the detected value is input to the arithmetic control circuit 10.
【０００８】次に、本発明の実験例を示す。 （実験例１）容量５００l の円形タンクからなる脱窒槽
を用い、槽内ＭＬＳＳ７２００〜８５００ｍｇ／l 、水
温２５〜２７℃、活性汚泥を含有する硝化水流入量７ｍ
3/日で、流入ＮＯ3 −Ｎをエタノールを注入して生物学
的に脱窒処理した。エタノールの注入は、脱窒槽気相部
のＨ2 Ｓ濃度を検出限界０．１ｐｐｍのＨ2 Ｓ自動分析
計で分析し、Ｈ2 Ｓ濃度に対応して逆比例制御を行なっ
た。この時の硝化水のＮＯ3 −Ｎ濃度変動パターンを図
３に、処理結果を表１に示す。Next, an experimental example of the present invention will be shown. (Experimental Example 1) Using a denitrification tank consisting of a circular tank having a capacity of 500 l, MLSS 7200 to 8500 mg / l in the tank, water temperature 25 to 27 ° C, and inflow amount of nitrified water containing activated sludge of 7 m
3 / day, and treated biologically denitrifying the inlet NO 3 -N was injected ethanol. For the injection of ethanol, the H 2 S concentration in the gas phase of the denitrification tank was analyzed by an H 2 S automatic analyzer with a detection limit of 0.1 ppm, and inverse proportional control was performed corresponding to the H 2 S concentration. The NO 3 -N concentration fluctuation pattern of the nitrification water at this time is shown in FIG. 3, and the treatment results are shown in Table 1.
【０００９】[0009]
【表１】 （実験例２）脱窒菌を付着固定化した粒径３〜４ｍｍの
アンスラサイトを充填した固定床式脱窒槽（容量２０l
）を用い、水温２２℃、硝化水（海水５０％含有す
る）流入量４００l ／日で、流入ＮＯ3 −Ｎをエタノー
ルを注入して生物学的に脱窒素処理した。エタノール注
入の自動制御は、脱窒処理水を経時的に自動サンプラー
で採水して硫黄イオン電極で検出し、脱窒処理水中のＳ
2-が１．０ｐｐｍ以上でエタノール注入ポンプが停止
し、Ｓ2-が０．８ｐｐｍ以下で作動するように設定し
た。この時の硝化水のＮＯ3 −Ｎ濃度変動パターンを図
４に処理結果を表１に示す。 （実験例３）実験例２におけるエタノール注入の自動制
御を、脱窒処理水を導いた硫化水素放散槽の気相部のＨ
2 Ｓ濃度をＨ2 Ｓ自動分析計で分析し、Ｈ2 Ｓ濃度に対
応して逆比例制御を行なった。この時のＮＯ3 −Ｎ濃度
変動パターンは、図４と同様であり、処理結果を表１に
示す。[Table 1] (Experimental Example 2) Fixed bed type denitrification tank (capacity 20 l
) Was used for biological denitrification by injecting ethanol with inflowing NO 3 -N at a water temperature of 22 ° C. and an inflow rate of nitrifying water (containing 50% of seawater) of 400 l / day. For automatic control of ethanol injection, denitrification treated water is sampled with an automatic sampler over time and detected with a sulfur ion electrode to detect S in denitrification treated water.
The ethanol injection pump was stopped when 2- was 1.0 ppm or more, and S 2- was set to operate at 0.8 ppm or less. The NO 3 —N concentration fluctuation pattern of the nitrifying water at this time is shown in FIG. 4, and the treatment results are shown in Table 1. (Experimental Example 3) The automatic control of ethanol injection in Experimental Example 2 was carried out by using H in the gas phase portion of the hydrogen sulfide diffusion tank which introduced the denitrification treated water.
The 2 S concentration was analyzed by an H 2 S automatic analyzer, and inverse proportional control was performed corresponding to the H 2 S concentration. The NO 3 -N concentration fluctuation pattern at this time is the same as in FIG. 4, and the processing results are shown in Table 1.
【００１０】[0010]
【効果】以上述べたように、本発明によれば、脱窒用還
元剤を過不足なく注入することができ、かつ過剰注入に
よる還元剤の残留を防止し、経済的に安定した脱窒処理
を行い、良質の処理液を得ることができるものである。[Effects] As described above, according to the present invention, the reducing agent for denitrification can be injected without excess and deficiency, and the reducing agent can be prevented from remaining due to excessive injection, and economically stable denitrification treatment can be performed. And a treatment liquid of good quality can be obtained.
【図１】本発明装置の一実施例の構成説明図である。FIG. 1 is a structural explanatory view of an embodiment of a device of the present invention.
【図２】本発明装置の他の実施例の構成説明図である。FIG. 2 is a structural explanatory view of another embodiment of the device of the present invention.
【図３】本発明の実験例１における硝化水のＮＯ3 −Ｎ
濃度変動パターンを示す線図である。FIG. 3 is NO 3 —N of nitrifying water in Experimental Example 1 of the present invention.
It is a diagram showing a density fluctuation pattern.
【図４】本発明の実験例２，３における硝化水のＮＯ3
−Ｎ濃度変動パターンを示す線図である。FIG. 4 is NO 3 of nitrifying water in Experimental Examples 2 and 3 of the present invention.
It is a diagram showing a -N concentration fluctuation pattern.
１1 脱窒槽 １2 脱窒槽 ２ 攪拌機 ３ ブロワ ４1 硝化槽 ４2 硝化槽 ５ 窒素酸化物含有液流入管 ６ 還元剤 ７ 還元剤注入設備 ８ 脱窒処理液流出管 ９1 分析計 ９2 分析計 10 演算制御回路 11 沈殿槽 12 汚泥返送管 13 アンスラサイト 14 ハニカムチューブ 15 硫化水素放散槽1 1 Denitrification tank 1 2 Denitrification tank 2 Stirrer 3 Blower 4 1 Nitrification tank 4 2 Nitrification tank 5 Nitrogen oxide-containing liquid inflow pipe 6 Reductant 7 Reductant injection facility 8 Denitrification treatment liquid outflow pipe 9 1 Analyzer 9 2 analysis Total 10 Calculation control circuit 11 Settling tank 12 Sludge return pipe 13 Anthracite 14 Honeycomb tube 15 Hydrogen sulfide diffusion tank
Claims (3)
中の窒素酸化物を脱窒工程で生物学的に還元脱窒する方
法において、前記脱窒工程気相部の硫化水素濃度，脱窒
工程流出液の硫黄イオン濃度，脱窒工程流出液の硫化水
素濃度の少なくとも一つを検出し、その検出値に基づい
て還元剤注入量を制御することを特徴とする生物学的脱
窒方法。1. A method of biologically reducing and denitrifying nitrogen oxides in a liquid by injecting a reducing agent into a liquid containing nitrogen oxides in the denitrifying step, wherein the hydrogen sulfide concentration in the gas phase part of the denitrifying step is Detecting at least one of the sulfur ion concentration in the denitrification process effluent and the hydrogen sulfide concentration in the denitrification process effluent, and controlling the injection amount of the reducing agent based on the detected value. Method
物を生物学的に還元脱窒する脱窒槽の気相部に硫化水素
検出装置を連結し、該硫化水素検出装置をその検出値に
より還元剤注入量を制御する演算制御回路を介して前記
還元剤注入設備に連結したことを特徴とする生物学的脱
窒装置。2. A hydrogen sulfide detection device is connected to a gas phase part of a denitrification tank, which is equipped with a reducing agent injection facility and which biologically reduces and denitrifies nitrogen oxides in the liquid, and detects the hydrogen sulfide detection device. A biological denitrification device, characterized in that the biological denitrification device is connected to the reducing agent injection equipment through an arithmetic and control circuit for controlling the amount of reducing agent injection by the value.
物を生物学的に還元脱窒する脱窒槽の脱窒処理液流出経
路に硫黄イオン及び又は硫化水素の検出装置を設け、こ
れらの検出装置をその検出値により還元剤注入量を制御
する演算制御回路を介して前記還元剤注入設備に連結し
たことを特徴とする生物学的脱窒装置。3. A sulfur ion and / or hydrogen sulfide detection device is provided in a denitrification treatment liquid outflow path of a denitrification tank for biologically reducing and denitrifying nitrogen oxides in the liquid, which is equipped with a reducing agent injection facility. 2. The biological denitrification device, wherein the detecting device is connected to the reducing agent injection equipment via an arithmetic control circuit that controls the reducing agent injection amount according to the detected value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3031330A JPH0688034B2 (en) | 1991-02-01 | 1991-02-01 | Biological denitrification method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3031330A JPH0688034B2 (en) | 1991-02-01 | 1991-02-01 | Biological denitrification method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06165996A JPH06165996A (en) | 1994-06-14 |
| JPH0688034B2 true JPH0688034B2 (en) | 1994-11-09 |
Family
ID=12328249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3031330A Expired - Fee Related JPH0688034B2 (en) | 1991-02-01 | 1991-02-01 | Biological denitrification method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0688034B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105214495A (en) * | 2015-09-18 | 2016-01-06 | 华南师范大学 | A kind of take hydrogen sulfide as the coal-fired flue-gas synchronized desulfuring and denitrifying technique of reducing agent |
-
1991
- 1991-02-01 JP JP3031330A patent/JPH0688034B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105214495A (en) * | 2015-09-18 | 2016-01-06 | 华南师范大学 | A kind of take hydrogen sulfide as the coal-fired flue-gas synchronized desulfuring and denitrifying technique of reducing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06165996A (en) | 1994-06-14 |
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