JPH0316198B2 - - Google Patents
Info
- Publication number
- JPH0316198B2 JPH0316198B2 JP18135383A JP18135383A JPH0316198B2 JP H0316198 B2 JPH0316198 B2 JP H0316198B2 JP 18135383 A JP18135383 A JP 18135383A JP 18135383 A JP18135383 A JP 18135383A JP H0316198 B2 JPH0316198 B2 JP H0316198B2
- Authority
- JP
- Japan
- Prior art keywords
- pressurized tank
- tank
- ultraviolet lamp
- ultraviolet rays
- substances
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 10
- 238000005188 flotation Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000002085 persistent effect Effects 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims 1
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 10
- 239000004021 humic acid Substances 0.000 description 10
- PUKLDDOGISCFCP-JSQCKWNTSA-N 21-Deoxycortisone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)C)(O)[C@@]1(C)CC2=O PUKLDDOGISCFCP-JSQCKWNTSA-N 0.000 description 8
- FCYKAQOGGFGCMD-UHFFFAOYSA-N Fulvic acid Natural products O1C2=CC(O)=C(O)C(C(O)=O)=C2C(=O)C2=C1CC(C)(O)OC2 FCYKAQOGGFGCMD-UHFFFAOYSA-N 0.000 description 8
- 229940095100 fulvic acid Drugs 0.000 description 8
- 239000002509 fulvic acid Substances 0.000 description 8
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000006864 oxidative decomposition reaction Methods 0.000 description 3
- 238000010979 pH adjustment Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- -1 fulvic acid Chemical compound 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
【発明の詳細な説明】
(1) 発明の属する分野
本発明は、例えば廃棄物埋立地などの浸出水、
汚泥の熱分解液などのように生物難分解性物質、
特にフミン酸やフルボ酸を多量に含む廃水の処理
方法に関する。
(2) 従来技術
フミン酸やフルボ酸は、微生物の代謝により最
終的に生成する老廃物であり、芳香族化合物を核
として糖、金属、タンパクなどが付加したものが
さらに重合した難分解性有機物質として知られて
いる。廃水中のフミン酸やフルボ酸は、生物処理
によりほとんど除去することができないが、フミ
ン酸が酸性で水に不溶であることを利用し、廃水
のPHを３以下にし生成する懸濁物質を固液分離す
る方法により、フミン酸の大部分を除去すること
ができる。特に、廃水のPHを下げると、溶解ガス
が微細気泡となつて析出し、懸濁物質の一部が浮
上する場合が多いため、固液分離の方法として、
沈降分離よりも浮上分離が有利である。出願人は
特開昭58−112093号公報にこれを開示した。
しかしながら、この方法ではフミン酸以外のフ
ルボ酸などの有機物質をほとんど除去することが
できず、これに起因するCODや色度が処理水中
で依然として高くなる欠点があつた。
(3) 発明の目的
本発明の目的は、前記従来技術の欠点を解消
し、廃水中のフミン酸およびフルボ酸などの有機
物質を効率よく除去し、良好な処理水質を得るこ
とができる処理方法を提供することにある。
(4) 発明の要点
この目的を達成するために、本発明は、フミン
酸やフルボ酸などの生物難分解性物質を含む廃水
のPHを３以下に調整したのち、生成する懸濁物質
を加圧タンクから析出させた微細気泡を用いて浮
上分離する方法において、浮上分離により得られ
る処理水の一部を加圧タンクに循環し、加圧タン
クに内蔵した紫外線ランプを用いて紫外線を照射
することを特徴としている。
(5) 発明の実施例
次に、図面に基づいて本発明方法を説明する。
第１図は本発明方法の一実施例形式を示すフロ
ーシートである。被処理水をPH調整槽１に導入
し、鉱酸の添加によりPHを３以下に調整すると、
フミン酸の大部分が固形化し懸濁状態となる。こ
うして生成した懸濁物質を含む廃水を浮上分離槽
２に送り、加圧タンク３から減圧弁４を通つて析
出する微細気泡を用いて懸濁物質を浮上分離し、
スカム５と処理水とを得る。
処理水の一部をアルカリ剤を加えて中和した後
に放流し、一方では、処理水の残りを加圧ポンプ
６を用いて加圧タンク３に循環する。加圧タンク
３の加圧力は、通常２〜５Kg／cm2である。
ここで、空気圧縮機７によつて空気を飽和溶解
させると同時に加圧タンク３に内蔵された紫外線
ランプ８により紫外線を照射する。紫外線ランプ
８は、加圧タンク３の容量に応じて通常複数本設
置される。このように空気を飽和溶解させた状態
で紫外線を照射することにより、PH調整−浮上分
離だけでは除去できないフルボ酸などの有機物質
を加圧タンク３内で効率よく酸化分解し除去する
ことができる。このとき、紫外線ランプには、難
分解性の有機物質の分解に効果がある254nｍの
波長の紫外線を照射するものが用いられる。特
に、254nｍだけでなく185nｍの波長の紫外線を
も同時に照射できる紫外線ランプを用いた場合、
溶存酸素からオゾンが生成し、このオゾンも有機
物質の酸化分解に寄与するため、より良好な処理
水質が得られる。この場合、空気が飽和溶解され
た状態で紫外線を照射するためオゾンの生成効率
がよく、また、加圧タンク３のみでなく浮上分離
槽２においても、オゾンにより有機物質の酸化分
解が進行する。
このように、空気溶解−浮上分離の工程を有効
に利用し、同時に有機物質の酸化分解を行うこと
が本発明の重要なポイントである。
次に、実施例に基づいて本発明を説明するが、
本発明はこれに限定されるものではない。
実施例
汚泥の熱分解液を被処理水として用いた。
CODは980mg／で、このうちフミン酸に起因す
るCODは520mg／、残りは主にフルボ酸に起因
するCODであつた。この被処理水に硫酸を添加
してPHを３とし、第１図に示すフローシートに従
つて処理した。処理水の循環比（処理水の循環量
と被処理水量の比）が１となるように処理水を加
圧タンクに循環し、ここでの滞留時間を１時間お
よび２時間としたときの処理水のCODを第１表
に示す。実施例１は加圧タンク内で254nｍの波
長の紫外線ランプ（100W）を用いて照射した場
合、実施例２は254nｍと185nｍの波長の紫外線
を同時に照射できる紫外線ランプ（100W）を用
いた場合、比較例は紫外線を全く照射しない場合
である。
【表】[Detailed Description of the Invention] (1) Field to which the invention pertains The present invention relates to leachate, e.g.
Biodegradable substances such as thermal decomposition liquid of sludge,
In particular, the present invention relates to a method for treating wastewater containing large amounts of humic acid and fulvic acid. (2) Conventional technology Humic acid and fulvic acid are waste products that are ultimately produced by the metabolism of microorganisms. known as matter. Humic acid and fulvic acid in wastewater can hardly be removed by biological treatment, but by taking advantage of the fact that humic acid is acidic and insoluble in water, it is possible to reduce the pH of wastewater to 3 or less and solidify the suspended solids that are generated. Most of the humic acid can be removed by liquid separation. In particular, when the pH of wastewater is lowered, dissolved gas often precipitates as fine bubbles and some of the suspended solids float to the surface.
Flotation separation is more advantageous than sedimentation separation. The applicant disclosed this in Japanese Patent Application Laid-Open No. 112093/1983. However, this method has the drawback that organic substances other than humic acid, such as fulvic acid, can hardly be removed, and the resulting COD and chromaticity remain high in the treated water. (3) Purpose of the Invention The purpose of the present invention is to provide a treatment method that eliminates the drawbacks of the prior art, efficiently removes organic substances such as humic acid and fulvic acid from wastewater, and provides good treated water quality. Our goal is to provide the following. (4) Summary of the Invention In order to achieve this objective, the present invention involves adjusting the pH of wastewater containing biorefractory substances such as humic acid and fulvic acid to 3 or less, and then adding suspended solids that are generated. In a method of flotation separation using microbubbles precipitated from a pressure tank, a portion of the treated water obtained by flotation separation is circulated to the pressure tank and irradiated with ultraviolet rays using an ultraviolet lamp built into the pressure tank. It is characterized by (5) Embodiments of the Invention Next, the method of the present invention will be explained based on the drawings. FIG. 1 is a flow sheet showing an embodiment of the method of the present invention. When the water to be treated is introduced into the PH adjustment tank 1 and the PH is adjusted to 3 or less by adding mineral acid,
Most of the humic acid solidifies and becomes suspended. The wastewater containing suspended solids generated in this way is sent to a flotation separation tank 2, and the suspended solids are floated and separated using fine bubbles precipitated from a pressurized tank 3 through a pressure reduction valve 4.
Scum 5 and treated water are obtained. A portion of the treated water is neutralized by adding an alkaline agent and then discharged, while the rest of the treated water is circulated to the pressurized tank 3 using the pressurized pump 6. The pressurizing force of the pressurized tank 3 is usually 2 to 5 kg/cm 2 . Here, the air is saturated and dissolved by the air compressor 7, and at the same time, ultraviolet rays are irradiated by the ultraviolet lamp 8 built in the pressurized tank 3. A plurality of ultraviolet lamps 8 are usually installed depending on the capacity of the pressurized tank 3. By irradiating ultraviolet light with the air saturated and dissolved in this way, organic substances such as fulvic acid that cannot be removed by pH adjustment and flotation separation can be efficiently oxidized and decomposed in the pressurized tank 3 and removed. . At this time, the ultraviolet lamp used is one that emits ultraviolet light with a wavelength of 254 nm, which is effective in decomposing persistent organic substances. In particular, when using an ultraviolet lamp that can simultaneously irradiate not only 254 nm but also 185 nm wavelength ultraviolet rays,
Ozone is generated from dissolved oxygen, and this ozone also contributes to the oxidative decomposition of organic substances, resulting in better treated water quality. In this case, since ultraviolet rays are irradiated in a state in which air is saturated and dissolved, ozone generation efficiency is high, and the oxidative decomposition of organic substances proceeds by ozone not only in the pressurized tank 3 but also in the flotation tank 2. As described above, an important point of the present invention is to effectively utilize the air dissolution-flotation separation process and simultaneously perform oxidative decomposition of organic substances. Next, the present invention will be explained based on examples.
The present invention is not limited to this. Example A thermal decomposition liquid of sludge was used as water to be treated.
The COD was 980mg/, of which 520mg/ was due to humic acid, and the rest was mainly due to fulvic acid. Sulfuric acid was added to this water to be treated to adjust the pH to 3, and the water was treated according to the flow sheet shown in FIG. Treatment when treated water is circulated to a pressurized tank so that the circulation ratio of treated water (the ratio of the amount of circulated water to the amount of water to be treated) is 1, and the residence time here is 1 hour and 2 hours. The COD of water is shown in Table 1. In Example 1, when irradiation was performed using an ultraviolet lamp (100W) with a wavelength of 254 nm in a pressurized tank, and in Example 2, when an ultraviolet lamp (100 W) that could simultaneously irradiate ultraviolet rays with wavelengths of 254 nm and 185 nm was used. A comparative example is a case where no ultraviolet rays are irradiated. 【table】
第１図は、本発明に係る生物難分解性物質を含
む廃水の処理方法の一実施形式を示すフローシー
トである。
１……PH調整槽、２……浮上分離槽、３……加
圧タンク、８……紫外線ランプ。
FIG. 1 is a flow sheet showing one embodiment of the method for treating wastewater containing biorefractory substances according to the present invention. 1...PH adjustment tank, 2...flotation separation tank, 3...pressure tank, 8...ultraviolet lamp.
Claims (1)
いて廃水のPHを３以下に調整して生成する懸濁物
質を加圧タンクから析出させた微細気泡を用いて
浮上分離し、該浮上分離により得られる処理水の
少なくともその一部を加圧タンクに循環し、加圧
タンクに内蔵した紫外線ランプを用いて紫外線を
照射することを特徴とする生物難分解性物質を含
む廃水の処理方法。 ２ 前記紫外線ランプが254nｍあるいは185nｍ
の紫外線を照射できるものである特許請求の範囲
第１項記載の処理方法。[Claims] 1. A method for purifying wastewater containing biorefractory substances, in which the pH of the wastewater is adjusted to 3 or less, and suspended solids generated are floated and separated using microbubbles precipitated from a pressurized tank. , wastewater containing biologically persistent substances, characterized in that at least a part of the treated water obtained by said flotation separation is circulated in a pressurized tank and irradiated with ultraviolet rays using an ultraviolet lamp built in the pressurized tank. processing method. 2 The ultraviolet lamp has a wavelength of 254nm or 185nm.
The treatment method according to claim 1, which is capable of irradiating with ultraviolet rays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18135383A JPS6071080A (en) | 1983-09-29 | 1983-09-29 | Treatment of waste water containing hardly biologically decomposable substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18135383A JPS6071080A (en) | 1983-09-29 | 1983-09-29 | Treatment of waste water containing hardly biologically decomposable substance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6071080A JPS6071080A (en) | 1985-04-22 |
| JPH0316198B2 true JPH0316198B2 (en) | 1991-03-04 |
Family
ID=16099224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18135383A Granted JPS6071080A (en) | 1983-09-29 | 1983-09-29 | Treatment of waste water containing hardly biologically decomposable substance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6071080A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109292896A (en) * | 2018-09-30 | 2019-02-01 | 同济大学 | A method for controlling humic acid in drinking water |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020034003A (en) * | 2000-11-01 | 2002-05-08 | 황부연 | Water purifier system |
| ITUD20090117A1 (en) * | 2009-06-15 | 2010-12-16 | Med Italia Srl | PURIFICATION SYSTEM FOR LIQUIDS AND ACTIVATED SYSTEM |
-
1983
- 1983-09-29 JP JP18135383A patent/JPS6071080A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109292896A (en) * | 2018-09-30 | 2019-02-01 | 同济大学 | A method for controlling humic acid in drinking water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6071080A (en) | 1985-04-22 |
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