JPS61146392A - Treatment of waste water containing cod - Google Patents
Treatment of waste water containing codInfo
- Publication number
- JPS61146392A JPS61146392A JP26746384A JP26746384A JPS61146392A JP S61146392 A JPS61146392 A JP S61146392A JP 26746384 A JP26746384 A JP 26746384A JP 26746384 A JP26746384 A JP 26746384A JP S61146392 A JPS61146392 A JP S61146392A
- Authority
- JP
- Japan
- Prior art keywords
- cod
- liq
- treatment
- hydrogen peroxide
- fenton
- 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
Links
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はＣＯＤ含有廃水、特に難分解性ＣＯＤ含有廃水
の処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for treating COD-containing wastewater, particularly persistent COD-containing wastewater.
（従来の技術）
近年、公共用水域における水質汚泥防止に対する社会的
要請の高まるに伴い、各種廃水処理方法、装置が提案さ
れきた。この肉離分解性ＣＯＤ含有廃水の処理に関して
「水処理技術」第２３巻、第１２号、第１３〜２２頁（
日本水処理技術研究会、昭和５７年１２月１５日発行）
および「環境技術」第１１巻１、第４号、第６３〜６５
頁（環境技術研究会、昭和５７年４月３０日発行）に、
フェントン処理およびフェントン法と活性汚泥法との組
合せ処理による難分解性有機化合物廃水の処理技術が記
載されている。(Prior Art) In recent years, with the increasing social demand for preventing water sludge in public water bodies, various wastewater treatment methods and devices have been proposed. Regarding the treatment of this separable COD-containing wastewater, "Water Treatment Technology" Vol. 23, No. 12, pp. 13-22 (
Japan Water Treatment Technology Study Group, published December 15, 1982)
and “Environmental Technology” Vol. 11, No. 4, No. 63-65
Page (Environmental Technology Research Group, published April 30, 1982),
A technology for treating persistent organic compound wastewater by Fenton treatment and a combination treatment of the Fenton method and activated sludge method is described.
一般に７エントン処理は、過酸化水素
（Ｈ２０２）の酸化力を利用した難分解性ＣＯＤを処理
する方法である。従来のフェントン法では、第３図に示
すように、難分解性ＣＯＤ含有廃水（原水）に硫酸第１
鉄、過酸化水素を加え、酸にてｐＨを３．５以下に調整
して１〜３時間液を攪拌することにより行なわれる。そ
してこの間過酸化水素が、硫酸第１鉄を触媒として難分
解性ＣＯＤに作用し、ＣＯＤ処理する。次いで処理済の
液をｐＨ＝７〜７．５に中和し、鉄等のフロック（汚泥
）を形成し、０．５〜１時間静置して処理水とフロック
を分離する。In general, 7-enton treatment is a method of treating refractory COD using the oxidizing power of hydrogen peroxide (H202). In the conventional Fenton method, as shown in Figure 3, sulfuric acid is added to wastewater (raw water) containing persistent COD.
This is done by adding iron and hydrogen peroxide, adjusting the pH to 3.5 or less with an acid, and stirring the solution for 1 to 3 hours. During this time, hydrogen peroxide acts on the refractory COD using ferrous sulfate as a catalyst to treat the COD. Next, the treated liquid is neutralized to pH=7 to 7.5 to form flocs (sludge) of iron or the like, and is left to stand for 0.5 to 1 hour to separate the treated water and flocs.
（発明が解決しようとする問題点）
このような従来のフェントン沫を用いる難分解性ＣＯＤ
含有廃水の処理法においては、フェントン処理後、処理
液のｐＨを７〜１．５に調整して処理水とするので、過
酸化水素の過剰添加の場合あるいは過酸化水素の必要歯
が時間によって変動す 。(Problems to be solved by the invention) Persistent COD using conventional Fenton droplets
In the treatment method for wastewater containing wastewater, after the Fenton treatment, the pH of the treated liquid is adjusted to 7 to 1.5 and used as treated water. It changes.
る場合などには過酸化水素が残留し、かえってＣ００、
ＢＯＤを高めることがあり、必ずしも満足のゆく廃水処
理が行われないという問題点がある。In cases such as when
There is a problem that BOD may be increased and wastewater treatment is not always satisfactory.
（問題点を解決するための手段）
本発明はＣＯＤ含有廃水、特に難分解性ＣＯＤ含有廃水
を７エントン酸化処理した後、処理液にアルカリを加え
てｐＨを１０以上にし、更に曝気したのち沈降分離し、
フロックと上澄水とに分離することにより、ＣＯＤおよ
びＢＯＤを著しく低下させることができることを知見し
たことに基づく。(Means for Solving the Problems) The present invention involves subjecting COD-containing wastewater, especially persistent COD-containing wastewater, to 7-enton oxidation treatment, adding an alkali to the treated solution to make the pH 10 or more, and further aerating the solution, followed by sedimentation. separate,
This is based on the finding that COD and BOD can be significantly reduced by separating flocs and supernatant water.
本発明の方法においては、第１図に示すように従来の７
エントン処理と同様に、難分解性ＣＯＤ含有水を塩酸ま
たは硫酸にてｐＨを３．５以下に調整し、次いでこれに
過酸化水素および硫酸第１鉄（ＦｅＳ０４・７Ｈ２ｏ）
を添加し、１〜３時間、例えばａｏｒｐｉで３時間攪拌
しフェントン処理を行い、処理後ｐＨを１０以上、好ま
しくは１０．５〜１２に調整し、調整後、処理液を曝気
槽において好ましくは槽１１３当り０．３〜１．５ｍ
３／Ｈｒの曝気量で１〜２時間曝気する、この際曝気量
が少いほど曝気時間を長くする。曝気後静置して上澄水
を分離し、上澄水は塩酸または硫酸にて中和し、処理水
とし、沈降汚泥は更に静置して上澄水を原水に戻す。In the method of the present invention, as shown in FIG.
Similar to the Enthone treatment, the pH of persistent COD-containing water is adjusted to 3.5 or less with hydrochloric acid or sulfuric acid, and then hydrogen peroxide and ferrous sulfate (FeS04.7H2o) are added to this.
is added, stirred for 1 to 3 hours, for example, 3 hours with an aorpi, and subjected to Fenton treatment. After the treatment, the pH is adjusted to 10 or more, preferably 10.5 to 12. After adjustment, the treated liquid is preferably placed in an aeration tank. 0.3-1.5m per tank 113
Aerate for 1 to 2 hours at an aeration rate of 3/Hr; the smaller the aeration rate, the longer the aeration time. After aeration, the sludge is allowed to stand and the supernatant water is separated, and the supernatant water is neutralized with hydrochloric acid or sulfuric acid to be used as treated water, and the settled sludge is left to stand still and the supernatant water is returned to raw water.
上記処理においては、（イ）過酸化水素の添加量は水質
により異なるが最初Ｏ〜２０００１ｔｌｌ／ Ｊ２の範
囲で３段階添加し、水質結果から増減して正式なデータ
を採る。（ロ）硫酸第１鉄（Ｆｅ ８０４・７Ｈ２０）
の添加量は一般に過酸化水素量の８０〜１００％の添加
で良いがフェントン処理、曝気時の過酸化水素分解（Ｃ
ＯＤ減少）反応、沈降処理の際の凝集性が悪い場合は増
加する。（ハ）フェントン処理の際のｐＨは、前記の如
く一般に３．５以下が良いとされている。（ニ）残留過
酸化水素を分解するにはｐＨ１１付近の強アルカリがよ
く、弱アルカリでは分解速度が遅い。第２図に曝気時間
と残留Ｈ２Ｏ２量の関係を示すが、図示するように曝気
時の過酸化水素分解（ＣＯＤ減少）反応にはＦｅが存在
しないと分解速度が遅くなる。In the above treatment, (a) the amount of hydrogen peroxide added varies depending on the water quality, but is initially added in three stages in the range of 0 to 20,001 tll/J2, and formal data is obtained by increasing or decreasing the amount based on the water quality results. (b) Ferrous sulfate (Fe 804/7H20)
The amount of hydrogen peroxide added is generally 80 to 100% of the amount of hydrogen peroxide, but hydrogen peroxide decomposition during Fenton treatment and aeration (C
OD decrease) reaction, increases if flocculation during sedimentation treatment is poor. (c) As mentioned above, it is generally said that the pH during the Fenton treatment is 3.5 or less. (d) To decompose residual hydrogen peroxide, a strong alkali with a pH around 11 is preferable, and a weak alkali has a slow decomposition rate. FIG. 2 shows the relationship between the aeration time and the amount of residual H2O2. As shown in the figure, in the absence of Fe, the decomposition rate becomes slow in the hydrogen peroxide decomposition (COD reduction) reaction during aeration.
本発明の方法においてフェントン処理後の液のｐＨを１
０以上とするが、１０未満では過酸化水素の分解速度が
１／１０に低下するので好ましくない。In the method of the present invention, the pH of the solution after Fenton treatment is set to 1.
It is set to be 0 or more, but if it is less than 10, the decomposition rate of hydrogen peroxide decreases to 1/10, which is not preferable.
また中性で析出しにくい金属の析出たとえばＦｅ（ＯＨ
）２ 、Ｃａ ００３等の析出はｐＨが約１０．５以上
であり、１０．５〜１２の範囲にすることにより、鉄等
のフロックの形成、中性では析出しにくいＣａＣＯ５等
のフロックの形成
Ｃａ ＣＯ２＋Ｃσ−３＋２Ｎａ ＯＨ→Ｃａ ＣＯ３
Ｌ ＋ ２ Ｎ ａ ＣＩｌ ＋ ＯＨＣａ （ＨＣ
Ｏ３）２ ＋Ｎａ ＯＨ−ＨＣａ ｃｏ３．＋Ｎａ
２ ＣＯ３＋２Ｈ２０残留過酸化水素の分解性の促進
並びにアンモニア性窒素のストリッピング
ＮＨ４Ｃ，ｇ＋Ｎａ ＯＨ→
ＮＨｓ ＋Ｎａ ＣＪ＋Ｈ２０
（ＮＨ４）ｚ ８０４ ＋２Ｎａ ＯＨ→２ＮＨｓ ＋
Ｎａ ２ ＳＯ４＋２Ｈ２０の促進が行われるので１０
．５〜１２とするのが好ましい。In addition, the precipitation of metals that are neutral and difficult to precipitate, such as Fe(OH)
) 2, Ca 003, etc. are precipitated at a pH of approximately 10.5 or higher, and by adjusting the pH to a range of 10.5 to 12, it is possible to form flocs such as iron, and to form flocs such as CaCO5, which are difficult to precipitate at neutral pH. Ca CO2+Cσ-3+2Na OH→Ca CO3
L + 2 Na CIl + OHCa (HC
O3)2 +Na OH-HCa co3. +Na
2 CO3+2H20 Promotion of decomposition of residual hydrogen peroxide and stripping of ammonia nitrogen NH4C,g+Na OH→ NHs +Na CJ+H20 (NH4)z 804 +2Na OH→2NHs +
Na2SO4+2H20 is promoted, so 10
．． It is preferable to set it as 5-12.
次にｐＨが１０以上に調整された液を曝気するが、この
曝気により残留過酸化水素が分解され、アンモニア性窒
素のストリッピングおよび金属フロックの成長が行われ
る。この曝気における曝気量は前記の如り０．３〜１．
５１１１３／Ｈｒ、Ｉ３槽とするのが好ましいが、この
理由は０．３未満では残留過酸化水素の分解が不十分で
あると共にフロックが沈降し、逆に１．５を越えると金
属フロックが細分化して沈降性が悪くなるためである。Next, the liquid whose pH has been adjusted to 10 or higher is aerated, and this aeration decomposes residual hydrogen peroxide, strips ammonia nitrogen, and causes metal flocs to grow. The amount of aeration in this aeration is 0.3 to 1.
51113/Hr, I3 tank is preferable, because if it is less than 0.3, the decomposition of residual hydrogen peroxide is insufficient and the flocs will settle, whereas if it exceeds 1.5, the metal flocs will be finely divided. This is because the sedimentation properties become worse.
また曝気時間の好適範囲は１〜２時間であるが、１時間
未満では残留過酸化水素の分解が不十分であり、一方２
時間を越すと成長した金属のフロックが細分化して好ま
しくない。In addition, the preferred range of aeration time is 1 to 2 hours, but if it is less than 1 hour, the decomposition of residual hydrogen peroxide is insufficient;
If the time is exceeded, the grown metal flocs will become fragmented, which is undesirable.
（実施例） 本発明を次の実施例および比較例により説明する。(Example) The invention will be illustrated by the following examples and comparative examples.
衷１１１
ゴミ埋立地排水（原水）につき、第１表に示すＮ００１
〜３の試験を行った。各試験において原水２００℃を２
００℃用量のステンレスドラム缶に入れた。このドラム
缶に攪拌機をセットし６０ｒｐｍで攪拌した。次いで原
水につき１０００ｍＭ ｉ、の硫酸（１０％）を添加し
、ｐＨを３に調整し、この溶液に第１表に示す分量で８
２０２（３０％）、ＦｅＳＯ４・７Ｈ２０（１００％）
の順に添加し、このまま６０ｒｐｍで３時間攪拌を継続
した。111 Landfill wastewater (raw water), N001 shown in Table 1
-3 tests were conducted. In each test, raw water was heated to 200℃ for 2
It was placed in a 00°C stainless steel drum. A stirrer was set in this drum and stirred at 60 rpm. Then 1000 mM i of sulfuric acid (10%) per raw water was added to adjust the pH to 3, and to this solution 8
202 (30%), FeSO4・7H20 (100%)
were added in this order, and stirring was continued at 60 rpm for 3 hours.
３時間の処理後夫々第１表に示す分量のＮａ０Ｈ（１０
％）を添加しｐＨを１１に調整した。After 3 hours of treatment, Na0H (10
%) was added and the pH was adjusted to 11.
このＩ）ｌ−１調整水を曝気槽（０，３＋ｅ ｘ Ｏ，
３ｉ ｘ高さ２．５ｍ ：散気板付き）に移し、１６０
Ｊ２ ／ Ｈｒ（０，８ｍ ３／Ｈｒ −ｍ ３曝気槽
）で１．５時間曝気した。This I)l-1 conditioned water is transferred to an aeration tank (0,3+e x O,
3i x height 2.5m: with air diffuser), 160
Aeration was carried out for 1.5 hours with J2/Hr (0,8 m 3 /Hr - m 3 aeration tank).
曝気終了後、３０分静置し、上澄水を傾斜法で分離し、
先の２００１容量ステンレスドラム缶に移し、夫々第１
表に示す分量から１００Ｏｎ＋ｌＪ／ Ｊを引いた残量
の硫酸（１０％）を添加しＩ）Ｈを１．５〜８に調整し
処理水とした。原水および処理水の分析を行い、得た結
果を第１表に併記する。After completing the aeration, let it stand for 30 minutes and separate the supernatant water using the decanting method.
Transfer to the 2001-capacity stainless steel drum, and
The remaining amount of sulfuric acid (10%) obtained by subtracting 100 On+lJ/J from the amount shown in the table was added to adjust I)H to 1.5 to 8 to obtain treated water. Raw water and treated water were analyzed, and the results are listed in Table 1.
第１表
この処理においてＢＯＤもＣＯＤとほぼ同じ除去性を示
す。Table 1 In this treatment, BOD also exhibits almost the same removability as COD.
また窒素除去については排水中の窒素（Ｎ）はアンモニ
ア性Ｎと有機性Ｎがほとんどである。この中の有機性Ｎ
が７エントン処理によりアンモニア性Ｎに変わり、１ｌ
Ｈ１１で曝気することによってもともと存在したアンモ
ニア性Ｎと共にアンモニアストリッピングにより除去さ
れ、Ｔ−Ｎの減少を示し、ＣａＣＯ５の除去については
、排水中にはＣａが溶解度の高いＣａＣＪ！ｚおよびＣ
ａ（ＨＣＯ３’）２として存在する。これを１）Ｈｌｌ
に調整して曝気することにより、ＣａＣβ２はもともと
排水中に存在しているＣｏ、ｉ２及び曝気により供給さ
れたＣ０−２と結合して溶解度の低いＣａＣＯ３となっ
て除去されＣａ （ＨＣＯ３）２もＮａ ＯＨと反応
してＣａＣＯ５になるので著しい低下を示している。Regarding nitrogen removal, most of the nitrogen (N) in waste water is ammoniacal N and organic N. Organic N in this
is converted to ammoniacal N by 7 entone treatment, and 1l
It was removed by ammonia stripping together with the ammoniacal N originally present by aeration with H11, showing a decrease in T-N, and as for the removal of CaCO5, CaCJ! z and C
It exists as a(HCO3')2. This is 1) Hll
By adjusting the temperature and aeration, CaCβ2 combines with Co and i2 originally present in the wastewater and C0-2 supplied by aeration to become CaCO3 with low solubility and is removed, and Ca(HCO3)2 is also removed. It shows a significant decrease because it reacts with NaOH to form CaCO5.
実施例と同様のゴミ埋立地排水（原水）につき、第２表
に示すＮ００１〜３の試験を行った。各試験とも原水２
００℃を実施例と同様のステンレスドラム缶に入れ攪拌
した。次いで原水につき第２表に示す分量の硫酸（１０
％）を添加し、ＤＨを３に調整し、この溶液にＨ２Ｏ２
（３０％）。Tests Nos. 001 to 3 shown in Table 2 were conducted on the same garbage landfill wastewater (raw water) as in the example. Raw water 2 for each test
The mixture was heated to 00°C and stirred in the same stainless steel drum as in the example. Next, add sulfuric acid (10
%), adjust the DH to 3, and add H2O2 to this solution.
(30%).
Ｆｅ ８０４ ・７Ｈ２０（１００％） １７）順に：
添加シ、このまま６０ｒｐｍで３時間攪拌を継続した。Fe 804 ・7H20 (100%) 17) In order:
After the addition, stirring was continued at 60 rpm for 3 hours.
３時間の処理後第２表に示す分量のＮａ０Ｈ（１０％）
を添加しＩＩＨを１．５に調整し処理水とした。原水お
よび処理水の分析を行い、得た結果を第２表に併記する
。After 3 hours of treatment, the amount of Na0H (10%) shown in Table 2
was added to adjust IIH to 1.5 to obtain treated water. Raw water and treated water were analyzed, and the results are listed in Table 2.
第２表
第１表および第２表の結果から、実施例の方法により、
従来のフェントン法による比較例の方法より著しく優れ
た処理効果が得られたことが明らかである。Table 2 From the results in Tables 1 and 2, by the method of the example,
It is clear that a treatment effect significantly superior to that of the comparative example using the conventional Fenton method was obtained.
（発明の効果）
以上説明してきたように本発明のＣＯＤ含有廃水処理方
法はフェントン処理を行った後、処理済液のｐＨを１０
以上に調整し、曝気し、沈澱させ、次いで上澄液を中和
して処理水として排出する構成としたため、従来技術で
は対応し得なかったフェントン処理における残留過酸化
水素を除去（残留ＣＯＤ除去）し、更にこの操作に伴っ
て配管スケールの原因となるＣａＣＯ５の除去、トータ
ル窒素（Ｔ−Ｎ）の除去、中性ｐＨ域では除去不能なＦ
ｅ （ＯＨ）２等の金属等も除去できるようになった
という効果が得られる。従って本発明の方法は有機廃水
の廃水処理、特に難分解性ＣＯＤ含有廃水処理に利用で
き、従って硬度処理、窒素除去も必要なゴム埋立地廃水
処理に有効である。(Effects of the Invention) As explained above, in the COD-containing wastewater treatment method of the present invention, after performing the Fenton treatment, the pH of the treated liquid is reduced to 10.
By adjusting the above, aerating, precipitating, and then neutralizing the supernatant liquid and discharging it as treated water, residual hydrogen peroxide in Fenton treatment, which could not be handled with conventional technology, can be removed (residual COD removal). ), and this operation also removes CaCO5, which causes pipe scale, total nitrogen (T-N), and F, which cannot be removed in the neutral pH range.
The effect is that metals such as e (OH)2 can also be removed. Therefore, the method of the present invention can be used to treat organic wastewater, especially wastewater containing persistent COD, and is therefore effective in treating rubber landfill wastewater, which also requires hardness treatment and nitrogen removal.
第１図は本発明の方法の工程図、 第２図は曝気時間と残留Ｈ２０２量の関係を示す線図、 第３図は従来の廃水フェントン処理法の工程図である。 FIG. 1 is a process diagram of the method of the present invention, Figure 2 is a diagram showing the relationship between aeration time and residual H202 amount. FIG. 3 is a process diagram of the conventional wastewater Fenton treatment method.
Claims (1)
を加え攪拌してｐＨを３．５以下にしフェントン処理し
た後、アルカリを加えて ｐＨを１０以上とし、得られたｐＨ調製水を曝気槽に移
し曝気し、次いで沈降分離して汚泥と上澄水とに分離す
ることを特徴とするＣＯＤ含有廃水の処理方法。 ２、曝気量が０．３〜１．５ｍ＾３／Ｈｒ、ｍ＾３曝気
槽で、曝気時間が１〜２時間である特許請求の範囲第１
項記載のＣＯＤ含有廃水の処理方法。 ３、フェントン処理後の廃水のｐＨを１０．５〜１２と
する特許請求の範囲第１項または第２項記載のＣＯＤ含
有廃水の処理方法。[Claims] 1. Add acid, hydrogen peroxide, and ferrous sulfate to COD-containing wastewater and stir to bring the pH to 3.5 or less and perform Fenton treatment, then add alkali to bring the pH to 10 or more, and obtain the A method for treating COD-containing wastewater, which comprises transferring the pH-adjusted water to an aeration tank and aerating it, followed by sedimentation and separation into sludge and supernatant water. 2. Claim 1, in which the aeration amount is 0.3 to 1.5 m^3/Hr, m^3 aeration tank, and the aeration time is 1 to 2 hours.
A method for treating COD-containing wastewater as described in Section 2. 3. The method for treating COD-containing wastewater according to claim 1 or 2, wherein the pH of the wastewater after Fenton treatment is adjusted to 10.5 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26746384A JPS61146392A (en) | 1984-12-20 | 1984-12-20 | Treatment of waste water containing cod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26746384A JPS61146392A (en) | 1984-12-20 | 1984-12-20 | Treatment of waste water containing cod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61146392A true JPS61146392A (en) | 1986-07-04 |
| JPH0331120B2 JPH0331120B2 (en) | 1991-05-02 |
Family
ID=17445184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26746384A Granted JPS61146392A (en) | 1984-12-20 | 1984-12-20 | Treatment of waste water containing cod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61146392A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100375292B1 (en) * | 1999-12-09 | 2003-03-10 | 주식회사 엔비로 | A disposal mathod of wastewater repeating oxidation and neutralization reaction |
| CN102167461A (en) * | 2011-05-06 | 2011-08-31 | 中国石油化工集团公司 | Method for treating production wastewater of o-chloroaniline |
| CN107686156A (en) * | 2017-10-25 | 2018-02-13 | 四川师范大学 | A kind of Fenton methods of efficient degradation organic pollutants |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0544924A4 (en) * | 1991-06-25 | 1993-11-03 | Nippon Steel Corporation | Method and device for treating waste water containing organic chlorine compounds |
-
1984
- 1984-12-20 JP JP26746384A patent/JPS61146392A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100375292B1 (en) * | 1999-12-09 | 2003-03-10 | 주식회사 엔비로 | A disposal mathod of wastewater repeating oxidation and neutralization reaction |
| CN102167461A (en) * | 2011-05-06 | 2011-08-31 | 中国石油化工集团公司 | Method for treating production wastewater of o-chloroaniline |
| CN107686156A (en) * | 2017-10-25 | 2018-02-13 | 四川师范大学 | A kind of Fenton methods of efficient degradation organic pollutants |
| CN107686156B (en) * | 2017-10-25 | 2019-10-11 | 四川师范大学 | A kind of Fenton method of efficient degradation organic pollutants |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0331120B2 (en) | 1991-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3617559A (en) | Neutralization of ferrous iron-containing acid wastes | |
| US4294703A (en) | Hydrogen peroxide treatment of effluent | |
| US5427691A (en) | Lime neutralization process for treating acidic waters | |
| US4321143A (en) | Treating effluent with peroxide and iron | |
| US3617540A (en) | Removal of nitrogen and phosphorus from waste waters | |
| US4422943A (en) | Method for precipitation of heavy metal sulfides | |
| US5820966A (en) | Removal of arsenic from iron arsenic and sulfur dioxide containing solutions | |
| US3617560A (en) | Limestone neutralization of dilute acid waste waters | |
| JP4649911B2 (en) | Treatment of organic matter and nitrogen-containing wastewater | |
| JPH07136669A (en) | Treatment of waste water containing dissolved heavy metal | |
| JP4570550B2 (en) | Nitrogen removal method and apparatus for high concentration organic wastewater | |
| JPS61146392A (en) | Treatment of waste water containing cod | |
| JPS6135894A (en) | Removal of arsenic in waste water | |
| JPS63278593A (en) | Method for removing arsenic from industrial waste liquid or the like | |
| JPH0751684A (en) | Treatment of waste water containing dissolved iron | |
| JP4552164B2 (en) | Waste liquid treatment method | |
| JPS63236592A (en) | Treatment of water containing antimony | |
| JPS5929092A (en) | Treatment of sewage containing nitrogen component | |
| JPS6320600B2 (en) | ||
| JPS5825519B2 (en) | Improved methane fermentation method | |
| JP4382167B2 (en) | Thermal power plant wastewater treatment method | |
| KR960002263B1 (en) | Treatment method for waste-water including ammonia | |
| JPS59209700A (en) | Treatment of conc. waste water containing heavy metal using iron-oxidizing bacteria | |
| CA1257019A (en) | Method of cyanide destruction | |
| JPS59173199A (en) | Biological treatment of waste water containing dithionic acid and ammonia |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |