JPS6071083A - Removal of heavy metal in waste water - Google Patents

Removal of heavy metal in waste water

Info

Publication number
JPS6071083A
JPS6071083A JP18147483A JP18147483A JPS6071083A JP S6071083 A JPS6071083 A JP S6071083A JP 18147483 A JP18147483 A JP 18147483A JP 18147483 A JP18147483 A JP 18147483A JP S6071083 A JPS6071083 A JP S6071083A
Authority
JP
Japan
Prior art keywords
added
waste water
flocculant
stirring
wastewater
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.)
Pending
Application number
JP18147483A
Other languages
Japanese (ja)
Inventor
Tetsuo Sawazaki
沢崎 哲夫
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP18147483A priority Critical patent/JPS6071083A/en
Publication of JPS6071083A publication Critical patent/JPS6071083A/en
Pending legal-status Critical Current

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  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

PURPOSE:To remove a heavy metal with good efficiency, by a method wherein an inorg. flocculant is added to waste water while calcium salt is added thereto in an amount equal to or more than an equivalent amount of the phosphate ion contained in said waste water to perform rapid stirring and, thereafter, a high- molecular flocculant is added to perform slow speed stirring. CONSTITUTION:A water soluble calcium salt 25 mixed in waste water 1 in a rapid stirring tank 2 in an amount equal to or more than an equivalent amount of the phosphate ion in waste water and, thereafter, an inorg. flocculant 21 such as ferric chloride is added to perform rapid stirring by a rapid stirrer 22 and, during stirring, an alkali agent 24 such as caustic soda is added to adjust the pH of the waste water to 10-11 by a pH indicating controller 23. Subsequently, the treated waste water is guided to a slow speed stirring tank 3 where an org. high-molecular flocculant 31 is added and slow speed stirring is performed by a slow speed stirrer 32 to form flocs which are, in turn, precipitated in a precipitation tank 4 to be separated into sludge 5 and treated water 6.

Description

【発明の詳細な説明】 本発明は廃水中の重金属の除去方法の改良に関する。[Detailed description of the invention] The present invention relates to an improved method for removing heavy metals from wastewater.

廃水中の重金属は通常、凝集沈殿法により処理されてい
る。従来法を第1図に基づいて説明する。凝集沈殿法は
廃水1を急速攪拌槽2に導き塩化第二鉄等の無機凝集剤
21を添加して急速攪拌機22により急速攪拌を行ない
ながら、苛性ソーダ等のアルカリ剤24を添加しPH指
示調節計23によりPHを10〜11に調整して溶解し
ている重金属を溶解度の小さい水酸化物に懸濁させる。
Heavy metals in wastewater are usually treated by coagulation and precipitation methods. The conventional method will be explained based on FIG. In the coagulation-sedimentation method, wastewater 1 is introduced into a rapid stirring tank 2, an inorganic flocculant 21 such as ferric chloride is added thereto, and while rapid stirring is performed by a rapid stirrer 22, an alkaline agent 24 such as caustic soda is added and a PH indicator controller is added. 23 to adjust the pH to 10 to 11 and suspend the dissolved heavy metals in the hydroxide with low solubility.

このとき無機凝集剤も水酸化物の懸濁物となって重金属
水酸化物と結合して大きな懸濁物として共沈する。次に
懸濁物を更に大ぎなフロックとするために緩速攪拌槽8
に導いて有機高分子凝集剤81を添加して緩速攪拌機8
2により緩速攪拌を行なった後、沈殿槽4で懸濁物(汚
泥)を沈降分離して上澄液6を処理水としてPHを中性
に調整した後放流するものであった。
At this time, the inorganic flocculant also becomes a hydroxide suspension, combines with the heavy metal hydroxide, and co-precipitates as a large suspension. Next, in order to make the suspended matter into even larger flocs, a slow stirring tank 8
Add organic polymer flocculant 81 and mix with slow stirrer 8
2, the suspended matter (sludge) was sedimented and separated in a sedimentation tank 4, and the supernatant liquid 6 was used as treated water and the pH was adjusted to neutral before being discharged.

しかし、廃水中にりん酸イオンが存在する場合、上記処
理法では凝集沈殿フロックが十分に形成されず廃水中の
重金属の処理が出来ないのが現状である。本発明は上記
欠点を解消するためなされたもので、その特徴とすると
ころは廃水を急速攪拌槽に導いて廃水中のリン酸イオン
の当量以上のカルシウム塩を添加混合しつつ無機凝集剤
を添加して急速攪拌を行なうと共にアルカリ剤を添加し
PHを調整した後次いで緩速攪拌槽に導いて高分子凝集
剤を添加して緩速攪拌を行ない、生成したフロックを沈
降分離する廃水中の重金属除去方法にある。本発明は」
−記のように廃水にりん酸イオンと当量以上の水溶性カ
ルシウム塩を添加迎合してから凝集沈殿処理を行なうの
で、フロックの形成が十分性なわれて、効率よく重金属
の除去が行なえるという効果を奏する。
However, when phosphate ions are present in wastewater, the above-mentioned treatment method does not sufficiently form coagulated and precipitated flocs, making it impossible to treat heavy metals in the wastewater. The present invention was made to solve the above-mentioned drawbacks, and its characteristics are that wastewater is introduced into a rapid stirring tank, and an inorganic flocculant is added while adding and mixing calcium salt in an amount equal to or more than the equivalent of phosphate ions in the wastewater. Heavy metals in the wastewater are then rapidly stirred and an alkali agent is added to adjust the pH.Then the wastewater is led to a slow stirring tank where a polymer flocculant is added and slowly stirred to separate the generated flocs by sedimentation. It's in the removal method. The present invention is
- As described above, coagulation and precipitation treatment is carried out after adding water-soluble calcium salts equivalent to or more than phosphate ions to wastewater, which ensures sufficient floc formation and enables efficient removal of heavy metals. be effective.

以下本発明の実施態様を第2図に基づいて説明する。Embodiments of the present invention will be described below based on FIG. 2.

廃水1は急速攪拌槽2にて、塩化カルシウム等の水溶性
カルシウム塩25を廃水中のりん酸イオンと当量以上添
加混合したのち、塩化第二鉄等の無機凝集剤21を加え
て急速攪拌機22で急速攪拌を行ないながら苛性ソーダ
等のアルカリ剤24の添加によりPH指示調節酎耐3で
PHを10−I+に調整する。次に緩速攪拌槽3に導き
有機高分子凝集剤81を添加して緩速攪拌機32により
緩速攪拌を行なってフロックを生成させた後、沈殿槽4
で該フロックを沈降させて汚泥5と処理水61こ分肉1
トする。
Wastewater 1 is mixed with a water-soluble calcium salt 25 such as calcium chloride in an amount equal to or more than the phosphate ion in the wastewater in a rapid stirring tank 2, and then an inorganic flocculant 21 such as ferric chloride is added and the mixture is stirred in a rapid stirring tank 22. With rapid stirring, the pH was adjusted to 10-I+ by adding an alkaline agent such as caustic soda to a pH of 3. Next, the organic polymer flocculant 81 is added to the slow stirring tank 3, and the slow stirring is performed by the slow stirring machine 32 to generate flocs.
The flocs are sedimented to form 5 sludge and 61 pieces of treated water.
to

このように急速攪拌槽2において無機凝集剤とアルカリ
剤とを添加混合して急速攪拌を行なうのでフロックの形
成が十分性なわれ、更に大ぎフロックとするために緩速
攪拌槽にて有機高分子凝集剤を添加し攪拌混合するので
沈殿槽においては懸濁物(汚泥)と上澄液との沈降分離
が十分性なわれ、上澄液には重金属等はほとんど含まれ
ず、廃水の処理が効果的に行なわれる。
In this way, the inorganic flocculant and alkaline agent are added and mixed in the rapid stirring tank 2, and the alkali agent is rapidly stirred, so that the formation of flocs is sufficient. Since a molecular flocculant is added and mixed with stirring, the sedimentation and separation between the suspended matter (sludge) and the supernatant liquid is sufficient in the settling tank, and the supernatant liquid contains almost no heavy metals, making it easy to treat wastewater. done effectively.

次に本発明の実施例を記述する。Next, embodiments of the present invention will be described.

廃水の性状は表1の通りである。The properties of the wastewater are shown in Table 1.

表1r9.水の性状 (試験方法・・・シャーテスター法による)また試験条
件は表2の通りである。
Table 1r9. The properties of the water (test method: based on the Shear tester method) and test conditions are shown in Table 2.

表2 試験条件 上記の条件での処理結果は表3に示す通りであった0 表8 処理結果 表記のように従来法ではフロックは生成せず。Table 2 Test conditions The processing results under the above conditions were as shown in Table 3. Table 8 Processing results As indicated, the conventional method does not generate flocs.

上澄液にはFe :I Omg7’l + P b :
 2.1 mV/ r Ou : 1.1mv’lであ
ったのに対し2本発明においてはフロックは良好に生成
し、上澄液には重金属類はほとんど含まれず、十分な廃
液処理がなされていることがわかる。
The supernatant contains Fe:I Omg7'l + Pb:
2.1 mV/r Ou: 1.1 mv'l, whereas in the present invention, flocs were well formed, the supernatant liquid contained almost no heavy metals, and sufficient waste liquid treatment was performed. I know that there is.

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

第1図は従来の廃水処理法を示すフローチャート、第2
図は本発明の実施態様例を表すフロチャートである。 1・・・廃水、2・・・急速攪拌槽、8・・・緩速攪拌
槽。 4・・・沈殿槽、21・・・無機凝集剤、24・・・ア
ルカリ剤。 81・・・有機高分子凝集剤
Figure 1 is a flowchart showing the conventional wastewater treatment method;
The figure is a flowchart representing an example embodiment of the present invention. 1... Wastewater, 2... Rapid stirring tank, 8... Slow stirring tank. 4... Sedimentation tank, 21... Inorganic flocculant, 24... Alkaline agent. 81...Organic polymer flocculant

Claims (1)

【特許請求の範囲】[Claims] 廃水を急速攪拌槽に導いて廃水中のリン酸イオンの当量
以上のカルシウム塩を添加混合しつつ無機凝集剤を添加
して急速攪拌を行なうと共にアルカリ剤を添加しPHを
調整した後次いで緩速攪拌槽に導いて高分子凝集剤を添
加し緩速攪拌を行ない、生成したフロックを沈降分離す
ることを特徴とする廃水中の重金属除去方法。
The wastewater is led to a rapid stirring tank, and while adding and mixing calcium salt in an amount equal to or more than the phosphate ion in the wastewater, an inorganic flocculant is added, rapid stirring is performed, and an alkaline agent is added to adjust the pH, and then slowly stirred. A method for removing heavy metals from wastewater, which is characterized by introducing a polymer flocculant into a stirring tank, performing slow stirring, and separating the generated flocs by sedimentation.
JP18147483A 1983-09-29 1983-09-29 Removal of heavy metal in waste water Pending JPS6071083A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18147483A JPS6071083A (en) 1983-09-29 1983-09-29 Removal of heavy metal in waste water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18147483A JPS6071083A (en) 1983-09-29 1983-09-29 Removal of heavy metal in waste water

Publications (1)

Publication Number Publication Date
JPS6071083A true JPS6071083A (en) 1985-04-22

Family

ID=16101383

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18147483A Pending JPS6071083A (en) 1983-09-29 1983-09-29 Removal of heavy metal in waste water

Country Status (1)

Country Link
JP (1) JPS6071083A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG152214A1 (en) * 2007-11-07 2009-05-29 Palo Alto Res Ct Inc Device and method for dynamic processing in water purification
US8276760B2 (en) 2006-11-30 2012-10-02 Palo Alto Research Center Incorporated Serpentine structures for continuous flow particle separations
US8931644B2 (en) 2006-11-30 2015-01-13 Palo Alto Research Center Incorporated Method and apparatus for splitting fluid flow in a membraneless particle separation system
US9486812B2 (en) 2006-11-30 2016-11-08 Palo Alto Research Center Incorporated Fluidic structures for membraneless particle separation
US10052571B2 (en) 2007-11-07 2018-08-21 Palo Alto Research Center Incorporated Fluidic device and method for separation of neutrally buoyant particles

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8276760B2 (en) 2006-11-30 2012-10-02 Palo Alto Research Center Incorporated Serpentine structures for continuous flow particle separations
US8931644B2 (en) 2006-11-30 2015-01-13 Palo Alto Research Center Incorporated Method and apparatus for splitting fluid flow in a membraneless particle separation system
US9486812B2 (en) 2006-11-30 2016-11-08 Palo Alto Research Center Incorporated Fluidic structures for membraneless particle separation
SG152214A1 (en) * 2007-11-07 2009-05-29 Palo Alto Res Ct Inc Device and method for dynamic processing in water purification
US9862624B2 (en) 2007-11-07 2018-01-09 Palo Alto Research Center Incorporated Device and method for dynamic processing in water purification
US10052571B2 (en) 2007-11-07 2018-08-21 Palo Alto Research Center Incorporated Fluidic device and method for separation of neutrally buoyant particles

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