JPS62110798A - Method for purifying waste water - Google Patents

Method for purifying waste water

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Publication number
JPS62110798A
JPS62110798A JP24804485A JP24804485A JPS62110798A JP S62110798 A JPS62110798 A JP S62110798A JP 24804485 A JP24804485 A JP 24804485A JP 24804485 A JP24804485 A JP 24804485A JP S62110798 A JPS62110798 A JP S62110798A
Authority
JP
Japan
Prior art keywords
ammonia
area
waste water
aquatic plant
overflow
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.)
Granted
Application number
JP24804485A
Other languages
Japanese (ja)
Other versions
JPH0527479B2 (en
Inventor
Takaaki Maekawa
孝昭 前川
Shingo Yamazawa
山沢 新吾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP24804485A priority Critical patent/JPS62110798A/en
Publication of JPS62110798A publication Critical patent/JPS62110798A/en
Publication of JPH0527479B2 publication Critical patent/JPH0527479B2/ja
Granted legal-status Critical Current

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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

PURPOSE:To treat waste water having a comparatively high content of ammonia by using a purifying tank of a simple structure when the ammonia-contg. waste water generated from methane fermentation is passed through the purifying tank provided with an aquatic plant culture bed and purified. CONSTITUTION:When ammonia-contg. waste water generated from methane fermentation is passed through the purifying tank 1 provided with an aquatic plant culture bed, the purifying tank 1 is separated into a raw water receiving zone A, a treating zone B, and an overflowing zone C by two sheetings 2 and 3 through which water can be circulated partially and freely. The lower bed 4 of the treating zone B is formed with gravel and the upper air-permeable bed 5 is formed with soil which is used as the culture soil for growing the aquatic plant 6 such as Eichhornia crassipes. The height of an overflow port 7 provided at the terminal end of the overflowing zone C is made controllable, and the overflow port 7 is lowered as the root of the aquatic plant grows. Consequently, the depth of the air-permeable part of the treating zone B can be regulated. The waste water having a comparatively high content of ammonia is treated with simple operation by using the purifying tank of the simple structure.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、産業廃水、生活廃水などをメタン発酵処理し
たのちに生じるアンモニア含有水溶液を脱窒処理して規
制値以下のアンモニア濃度とするだめの方法に関するも
のである。
[Detailed Description of the Invention] Industrial Application Field The present invention is a method for denitrifying an ammonia-containing aqueous solution produced after methane fermentation treatment of industrial wastewater, domestic wastewater, etc. to reduce the ammonia concentration below the regulatory value. It is related to.

従来の技術 有機物を含有する産業廃水や家庭から排出される生活廃
水を、土壌菌を利用して嫌気的分解し、浄化する方法は
、いわゆるメタン発酵法として知られている。
2. Description of the Related Art A method of anaerobically decomposing and purifying industrial wastewater containing organic matter and domestic wastewater discharged from households using soil bacteria is known as the so-called methane fermentation method.

このメタン発酵法によると、メタン、水素のような可燃
性ガスとともに、アンモニア、硫黄化合物が生成するの
で、この方法で処理された廃水中には、通常1000〜
3000ppm程度のアンモニアが含まれる。
According to this methane fermentation method, ammonia and sulfur compounds are produced along with flammable gases such as methane and hydrogen.
Contains about 3000 ppm of ammonia.

これまで、このようなアンモニア含有廃水は、例えばろ
過などにより固形分を除去したのち、100〜300倍
の水で希釈して、アンモニア濃度を許容範囲以下として
河川等に放流していた。
Until now, such ammonia-containing wastewater has been discharged into rivers and the like by diluting the solid content by filtration, for example, and then diluting it with 100 to 300 times the amount of water to bring the ammonia concentration below a permissible range.

しかしながら、このような希釈法では、大量の希釈水を
必要とする上に、処理後の容積がぼう大な量になるため
、設備が大型化するのを免れない。
However, such a dilution method requires a large amount of dilution water and also has a huge volume after treatment, which inevitably increases the size of the equipment.

また、化学的処理により、アンモニアを除去する方法も
提案されているが、特別の処理剤を必要とするためコス
ト高になり実用的でない。
A method of removing ammonia by chemical treatment has also been proposed, but this method requires a special treatment agent, resulting in high costs and is not practical.

他方、ホティアオイのようなある種の水生植物が水中の
アンモニア態窒素を吸収し、これを除去する能力を有す
ることが知られ、これを利用して、メタン発酵処理廃水
中のアンモニアを除去することも検討されている。
On the other hand, it is known that certain aquatic plants such as water hyacinth have the ability to absorb and remove ammonia nitrogen from water, and this can be used to remove ammonia from methane fermentation wastewater. is also being considered.

しかしながら、このホティアオイは、アンモニア濃度1
001] +1 In付近で生長阻害を生じ始め、20
0.ρ1゜以上では枯死するため、メタン発酵処理廃水
に適用するには、これをかなり希釈しなければならない
という従来の希釈法と同様の欠点があり、そのまま実用
化することはできない。
However, this water hyacinth has an ammonia concentration of 1
001] Growth inhibition started to occur near +1 In, and 20
0. If it exceeds ρ1°, it will wither and die, so it has the same drawback as the conventional dilution method in that it must be diluted considerably in order to be applied to methane fermentation wastewater, and cannot be put to practical use as is.

発明が解決しようとする問題点 本発明の目的は、メタン発酵により生しるアンモニア含
有水溶液を、水生植物で処理してアンモニアを除去する
際に、大量の水で希釈せずに、できるだけ小容量のまま
適用しうる方法を提供することである。
Problems to be Solved by the Invention An object of the present invention is to reduce the volume of an ammonia-containing aqueous solution produced by methane fermentation to as small a volume as possible without diluting it with a large amount of water when treating it with aquatic plants to remove ammonia. The purpose is to provide a method that can be applied as is.

問題点を解決するための手段 本発明者らは、比較的高濃度のアンモニアの存在下にお
いても、水生植物の生長阻害を生しさせることなく、ア
ンモニア除去を円滑に行わせる方法を開発するために鋭
意研究を重ねた結果、水生植物が100.010以−1
−のアンモニアの存在下で生長阻害を生じ、200pp
m以−にで枯死するのは、根糸がアンモニウムイオンを
吸収し、硝酸態に変換させる際の水中の溶存酸素不足に
原因があること、したがって、根糸への酸素供給が十分
に行われれば、800〜]000ppI11というかな
り高濃度のアンモニアが存在しても生艮明害を生じない
ことを見出し、この知見に基づいて本発明をなすに至っ
た。
Means for Solving the Problems The present inventors aimed to develop a method for smoothly removing ammonia without inhibiting the growth of aquatic plants even in the presence of relatively high concentrations of ammonia. As a result of intensive research, we found that aquatic plants are more than 100.010-1
- results in growth inhibition in the presence of ammonia, 200 pp.
The reason why the root threads die after 300 m is due to a lack of dissolved oxygen in the water when the root threads absorb ammonium ions and convert them into nitrate. Therefore, the root threads are not sufficiently supplied with oxygen. For example, it has been found that even in the presence of ammonia at a fairly high concentration of 800 to 000 ppI11, no illumination damage occurs, and based on this finding, the present invention has been accomplished.

すなわち、本発明は、メタン発酵処理により生じるアン
モニア含有廃水を水生植物栽培床を備え域、処理域及び
溢流域に区画し、かつ処理域を下層を礫層、上層を通気
土壌層とする培土に水生植物を植栽した構造とするとと
もに、溢流域の末端に設けられた溢流口の高さを上下方
向に調節可能とし、水生植物の根の成長に従って、順次
、溢流口の高さを下げることにより通気部深度を調節す
ることを特徴とする廃水の浄化方法を提供するものであ
る。
That is, the present invention divides ammonia-containing wastewater generated from methane fermentation treatment into an area with an aquatic plant cultivation bed, a treatment area, and an overflow area, and transforms the treatment area into a culture soil with a gravel layer in the lower layer and an aerated soil layer in the upper layer. In addition to having a structure in which aquatic plants are planted, the height of the overflow port provided at the end of the overflow area can be adjusted vertically, and the height of the overflow port can be adjusted in sequence according to the growth of the roots of the aquatic plants. The present invention provides a method for purifying wastewater characterized by adjusting the depth of the vent by lowering the depth of the vent.

次に添付図面に従って、本発明の実施態様の1例を説明
する。
Next, one example of an embodiment of the present invention will be described according to the accompanying drawings.

第1図は、本発明方法に用いる浄化槽の構造の1例を説
明するための縦断面図であり、長方形状浄化槽1は、2
枚の堰板2,3により原水受入域A1処哩域B及び溢流
域Cに区画されている。2枚の堰板2はその下方に、堰
板3はその上方にそれぞれ空隙が設けられ、各域はこれ
らによって流通自在となっている。処理域Bは、下層を
礫層4、上層を通気土壌層5とする培土に、水生植物例
えばホティアオイ6.6・・・が植栽された構造を有し
ている。この礫層4は、粒子径20〜30贋肩の無機質
固体例えば砂利、スラグなどで構成され、通気土壌層5
は粒径1肩肩以下の多孔質粒状体例えば川砂、土などで
構成されるが、この通気土壌層としては、通気性、透水
性、保水性の良好なものを用いるのが好ましい。
FIG. 1 is a longitudinal cross-sectional view for explaining an example of the structure of a septic tank used in the method of the present invention.
It is divided into a raw water receiving area A, a treatment area B, and an overflow area C by two weir plates 2 and 3. A gap is provided below the two weir plates 2, and a gap is provided above the weir plate 3, allowing free circulation in each area. The treatment area B has a structure in which aquatic plants such as water hyacinth 6,6, etc. are planted in a culture soil having a gravel layer 4 as a lower layer and an aerated soil layer 5 as an upper layer. This gravel layer 4 is composed of inorganic solids such as gravel, slag, etc. with a particle size of 20 to 30 mm, and the aerated soil layer 5
The soil layer is composed of porous granules having a grain size of one shoulder or less, such as river sand, soil, etc., and it is preferable to use a material with good air permeability, water permeability, and water retention as the aerated soil layer.

礫層4の厚さは、通気土壌層5を十分に支持することが
でき、かつ供給される廃水が円滑に流通でトればよく、
特に制限はないが、通気土壌層5の厚さは、少なくとも
水生植物の根糸が達する深さよりも大きくすることが必
要であり、通常は15〜30czの範囲で選ばれる。
The thickness of the gravel layer 4 should be such that it can sufficiently support the aerated soil layer 5 and that the supplied wastewater can be smoothly distributed.
Although there is no particular restriction, the thickness of the aerated soil layer 5 needs to be at least greater than the depth reached by the root threads of aquatic plants, and is usually selected in the range of 15 to 30 cz.

このような構成をもつ培土に植栽する水生植物としては
、ホティアオイが好適であるが、その他の、アンモニア
の吸収硝化能力のある水生植物例えばオオ7トイなども
用いることがで外る。
As an aquatic plant to be planted in the soil having such a structure, water hyacinth is suitable, but other aquatic plants that have the ability to absorb and nitrify ammonia, such as Phytophthora japonica, can also be used.

」二記のホティアオイは、ポンテデリアセアエ(Pon
tederiaceae)属に属する多年生植物の1種
であり、学名をエイチホルニア・クラシペス(Eich
bornia Crassipes)といい、池、湖沼
、低湿地帯などに広く分布植生している。
” The water hyacinth in the second book is Pontederiaceae
It is a type of perennial plant belonging to the genus tederiaceae, and its scientific name is Eichhornia crassipes.
bornia Crassipes), and is widely distributed in ponds, lakes, marshes, and low-lying areas.

このホティアオイは、通常処理域Bに1M!2当り4〜
10株の割合で植栽される。
This water hyacinth is 1M in the normal treatment area B! 2 per 4~
Planted at a rate of 10 plants.

次に、溢流域Cの末端には、処理された廃水を排出させ
るための溢流ロアが設けられているが、これは、上下に
高さを調t16Lうるようになっておリ、水生植物の根
糸の生長とともに、順次その高さを低くして、処理域B
の水面を低下させ、通気部深度を調節する。この溢流ロ
アの高さの調節は、必要な都度手動によって行うことも
できるし、また根糸の先端位置を適当なセンサーで検知
し、自動的に行わせることもで終る。
Next, an overflow lower is provided at the end of the overflow area C to discharge the treated wastewater, and the height of this can be adjusted up and down. As the root threads grow, the height is gradually lowered and
lower the water level and adjust the vent depth. Adjustment of the height of the overflow lower can be done manually whenever necessary, or it can be done automatically by detecting the tip position of the root filament with an appropriate sensor.

この浄化槽は、通常、第1図に示されるように長方形状
に設計されるが、特にこの形状には制限はなく、例えば
同心固状に区画し、内側から11i次、原水受入域、処
理域、溢流域とすることもで外るし、また逆に外側から
順次、原水受入域、処理域、溢流域とすることもできる
This septic tank is usually designed in a rectangular shape as shown in Figure 1, but there is no particular restriction on this shape. It can be set as an overflow area, or conversely, it can be set as a raw water receiving area, a treatment area, and an overflow area sequentially from the outside.

この浄化槽を用いてアンモニア含有廃水を処理するには
、先ず原水受入域Aに、アンモニア濃度11000pp
以下に調整したメタン発酵処理廃水を導入する。この廃
水の供給速度は、水生植物1株当り、アンモニア0.0
5〜O,ly/dayの割合になるように選ばれる。
To treat ammonia-containing wastewater using this septic tank, first, the raw water receiving area A has an ammonia concentration of 11,000 pp.
Introduce methane fermentation treated wastewater adjusted as follows. The feed rate of this wastewater is 0.0 ammonia per aquatic plant.
The ratio is selected to be 5 to O.ly/day.

導入された廃水は、第一の堰板2の下部の空隙を通って
、処理域Bの礫層4に入り、次第に」二昇−フ− して通気土壌層5に至り、水生植物の根部に接触し、こ
こでアンモニアは吸収除去される。アンモニアが除去さ
れた廃水は、次いで第二の堰板3の下部の空隙を通って
溢流域Cに入り、その末端に設けられた溢流ロアを通っ
て外部へ排出される。
The introduced wastewater passes through the gap at the bottom of the first weir plate 2, enters the gravel layer 4 of the treatment area B, gradually rises up to reach the aerated soil layer 5, and reaches the roots of aquatic plants. The ammonia is absorbed and removed here. The wastewater from which ammonia has been removed then enters the overflow area C through the gap at the bottom of the second weir plate 3, and is discharged to the outside through the overflow lower provided at the end.

このようにして、平均的80%、最高92%という高い
除去率でアンモニアを除去することができる。
In this way, ammonia can be removed at a high removal rate of 80% on average and 92% at maximum.

本発明方法における浄化槽には、必要に応し適所に空気
送入管を設け、アンモニアの硝化作用をさらに促進する
こともできるし、また処理域における礫層と通気土壌層
の間に、中間層例えば砂層を設けて廃水の流通の円滑化
を図ることもできる。
The septic tank in the method of the present invention can be provided with an air inlet pipe at an appropriate location as necessary to further promote the nitrification effect of ammonia. For example, a sand layer may be provided to facilitate the flow of wastewater.

発明の効果 本発明によると、非常に簡単な構造の浄化槽を用い、し
かも簡単な繰作で、比較的高濃度のアンモニアを含有す
る廃水を処理することができ、高い除去率でアンモニア
を除去することができるので、メタン発酵処理後の廃水
の処理方法として好適である。
Effects of the Invention According to the present invention, wastewater containing a relatively high concentration of ammonia can be treated using a septic tank with a very simple structure and with simple operation, and ammonia can be removed with a high removal rate. Therefore, it is suitable as a method for treating wastewater after methane fermentation treatment.

実施例 次に実施例により本発明をさらに詳細に説明する。Example Next, the present invention will be explained in more detail with reference to Examples.

実施例 たて5.511.横2.7肩、高さ0,7zのコンクリ
ート製浄化槽を、第1図に示すように、下部に通水孔を
有する2枚の堰板により、たて方向の長さがそれぞれ0
,5Jl、 4.5肩及び0,5Jlになるように区切
り、原水受入域、処理域、溢流域を形成させた。
Example 5.511. As shown in Figure 1, a concrete septic tank with a width of 2.7 shoulders and a height of 0.7 mm is constructed by two weir plates with water holes at the bottom, each with a length of 0 in the vertical direction.
, 5 Jl, 4.5 shoulder, and 0.5 Jl to form a raw water receiving area, a treatment area, and an overflow area.

次に、粒径20〜40vaの砂利を、厚さ30cmで処
理域に敷きつめ、さらにその上に鹿沼土を厚さ30cI
Iで積層し、培土とした。この培土に前後左右30ca
+の間隔でホティアオイ112株を植栽した。
Next, gravel with a particle size of 20 to 40 va is spread over the treatment area to a thickness of 30 cm, and on top of that, Kanuma soil is spread to a thickness of 30 cI.
It was layered with I and used as a potting soil. This cultivation soil has 30ca of front and back and left and right
112 plants were planted at intervals of +.

このような構造の浄化槽に、BOD2500肩g/N、
 C0D21000+1?#’、アンモニア分300p
pmを含有するメタン発酵処理廃水を、アンモニアの面
積負荷0.5g/lI2/dayの条件下で120日間
通過させ、その間のアンモニア態窒素除去率を測定した
。なお、この間、ホティアオイの根の生長に応じて、溢
流口の高さを下げ、処理域の水面がほぼ根の先端にくる
ように調節した。
A septic tank with this structure has a BOD of 2500 g/N,
C0D21000+1? #', ammonia content 300p
The wastewater from the methane fermentation process containing pm was passed for 120 days under the conditions of an ammonia area load of 0.5 g/lI2/day, and the ammonia nitrogen removal rate during that period was measured. During this period, the height of the overflow opening was lowered according to the growth of the roots of the water hyacinth, and the water level in the treated area was adjusted so that it was almost at the tip of the roots.

このようにして、得た結果を第2図に実線グラフとして
示す。
The results thus obtained are shown in FIG. 2 as a solid line graph.

また、比較のために、処理域の水面の調節をせずに同様
の処理を行った場合の結果を破線グラフとして併記した
For comparison, the results obtained when the same treatment was performed without adjusting the water level in the treatment area are also shown as a broken line graph.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明方法に用いる浄化槽の構造の1例を表わ
す縦断面図、第2図は本発明により処理した廃水のアン
モニア態窒素除去率の経時的変化を示すグラフである。 図中符号1は浄化槽、4は礫層、5は通気土壌層、6は
ホティアオイである。 手続補正書 昭和61年5 月228 1、事件の表示 昭和60年特許願第248044号 2、発明の名称 廃水の浄化方法 3、補正をする者 事件との関係特許出願人 住 所茨城県稲敷郡牛久町牛久536−92氏 名 前
 川 孝 昭 (ほか1名)4、代 理 人 5、補正命令の日付 自 発 8、補正の内容 (1)図面の第2図を別紙のとおり訂正します。
FIG. 1 is a longitudinal sectional view showing an example of the structure of a septic tank used in the method of the present invention, and FIG. 2 is a graph showing changes over time in the ammonia nitrogen removal rate of wastewater treated according to the present invention. In the figure, numeral 1 is a septic tank, 4 is a gravel layer, 5 is an aerated soil layer, and 6 is a water hyacinth. Procedural Amendment May 1988 228 1. Indication of the case Patent Application No. 248044 of 1985 2. Name of the invention Wastewater purification method 3. Person making the amendment Relationship to the case Patent applicant Address Address Inashiki District, Ibaraki Prefecture 536-92 Ushiku, Ushiku Town Name: Takaaki Kawa (and 1 other person) 4. Agent 5. Date of amendment order Voluntary 8. Contents of amendment (1) Figure 2 of the drawings will be corrected as shown in the attached sheet. .

Claims (1)

【特許請求の範囲】[Claims] 1 メタン発酵処理により生じるアンモニア含有廃水を
水生植物栽培床を備えた浄化槽を通して浄化するに当り
、浄化槽を、部分的に流通自在とした2枚の堰板で原水
受入域、処理域及び溢流域に区画し、かつ処理域を下層
を礫層、上層を通気土壌層とする培土に水生植物を植栽
した構造とするとともに、溢流域の末端に設けられた溢
流口の高さを上下方向に調節可能とし、水生植物の根の
成長に従って、順次溢流口の高さを下げることにより、
処理域の通気部深度を調節することを特徴とする廃水の
浄化方法。
1. When purifying ammonia-containing wastewater generated from methane fermentation treatment through a septic tank equipped with an aquatic plant cultivation bed, the septic tank is connected to the raw water receiving area, treatment area, and overflow area using two dam plates that allow partial circulation. The treatment area is divided into sections and has a structure in which aquatic plants are planted in culture soil with a gravel layer in the lower layer and an aerated soil layer in the upper layer, and the height of the overflow opening provided at the end of the overflow area is adjusted vertically. By making it adjustable and gradually lowering the height of the overflow port according to the growth of aquatic plant roots,
A method for purifying wastewater, comprising adjusting the depth of the aeration section in the treatment area.
JP24804485A 1985-11-07 1985-11-07 Method for purifying waste water Granted JPS62110798A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24804485A JPS62110798A (en) 1985-11-07 1985-11-07 Method for purifying waste water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24804485A JPS62110798A (en) 1985-11-07 1985-11-07 Method for purifying waste water

Publications (2)

Publication Number Publication Date
JPS62110798A true JPS62110798A (en) 1987-05-21
JPH0527479B2 JPH0527479B2 (en) 1993-04-21

Family

ID=17172357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24804485A Granted JPS62110798A (en) 1985-11-07 1985-11-07 Method for purifying waste water

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JP (1) JPS62110798A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1330591C (en) * 2002-11-13 2007-08-08 王晓川 Decentralizing treating and utilizing technology for zero discharging sewage
CN100378010C (en) * 2006-07-17 2008-04-02 文娱 Sewage purifying plant facility and method
WO2011145316A1 (en) * 2010-05-17 2011-11-24 Aic Tokyo株式会社 Organic waste resource recovery method using duckweed

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1330591C (en) * 2002-11-13 2007-08-08 王晓川 Decentralizing treating and utilizing technology for zero discharging sewage
CN100378010C (en) * 2006-07-17 2008-04-02 文娱 Sewage purifying plant facility and method
WO2011145316A1 (en) * 2010-05-17 2011-11-24 Aic Tokyo株式会社 Organic waste resource recovery method using duckweed
JP4923167B2 (en) * 2010-05-17 2012-04-25 Aic Tokyo株式会社 Resource recycling method of organic waste liquid using duckweeds

Also Published As

Publication number Publication date
JPH0527479B2 (en) 1993-04-21

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