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Method and apparatus for treating chelating agent-containing water with fluorine and phosphorus

Toru Nakano, +1 more
TLDR
In this article, a method for treating chelating agent-containing water with fluorine and phosphorus is presented. But the method is not suitable for the treatment of water containing a chelation agent.
Abstract: 
PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating chelating agent-containing water with fluorine and phosphorus, in which water containing a chelating agent is subjected to Fenton treatment before the chelating agent-containing water is treated with fluorine and phosphorus, to form a calcium compound stably, so that the amount of sludge to be generated is reduced and higher-quality treated water is obtained. SOLUTION: The method for treating the chelating agent-containing water with fluorine and phosphorus comprises: a insolubilized material formation step of reacting the calcium compound with raw water containing the chelating agent and hydrofluoric acid and/or phosphorus to form an insolubilized material; and a solid-liquid separation step of subjecting the formed insolubilized material to solid-liquid separation to obtain treated water. Such a step that raw water is subjected to Fenton treatment in the presence of a ferrous ion and H 2 O 2 , is arranged substantially before the insolubilized material formation step. COPYRIGHT: (C)2007,JPO&INPIT

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Water treatment apparatus and method

Shinichiro Kawashima, +9 more
TL;DR: In this article, the authors proposed a water treatment apparatus that includes a Fenton treatment, a coagulation treatment, and a pH adjusting means which adjusts the pH of the biologically treated water having been subjected to the biological treatment to ≥ 4.0 and ≤ 6.0.
Patent

Water treatment apparatus and water treatment method

Shigeru Hayashi, +4 more
TL;DR: In this paper, a water treatment device which treats water containing a polyvalent aminocarboxylic acid compound and a polyester resin and reduces the amount of sludge generated is presented.
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Antibiotic wastewater deep treatment device and treatment method

Hong Yao, +4 more
TL;DR: In this article, an antibiotic wastewater deep treatment device consisting of a coagulation and precipitation device, a regulating pool, a Fenton reaction, a resin reaction pool and a resin precipitation and separation pool is presented.
Patent

Fluorine-containing wastewater treatment method based on Fenton oxidation reaction, and apparatus thereof

Xu Jianhua, +2 more
TL;DR: In this paper, a fluorine-containing wastewater treatment method based on a Fenton oxidation reaction and an apparatus consisting of an adjustment tank, an oxidation tank, a coagulation tank and an agent addition reaction tank is presented.
Patent

Device for recovering phosphorus from phosphorus-containing water

Kenji Mitsutome, +9 more
TL;DR: In this article, a device for recovering phosphorus from phosphorus-containing water, in which agglomerating phosphorus is not precipitated and a phosphorus recovery rate is not lowered, is presented.
References
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Patent

Method and apparatus for treating electroless nickel plating waste solution

Takayuki Kameoka, +5 more
TL;DR: In this paper, a packed column V is packed with a chelating resin and a plating waste soln. The solvent is injected into the column under pressure by a pump P-1 to be passed from below to above to be brought into contact with the solvent.
Patent

Method and device for treating waste water

Kazumi Nakajo, +7 more
TL;DR: In this paper, the sludge settled in a settling tank 19 is introduced (returned) into a return-sludge reaction tank 3 having a settling part 6 in the rear in this waste water treating device.
Patent

Treatment of waste water containing phosphorus and cod component

Kataoka Katsuyuki
TL;DR: In this paper, the authors proposed to prevent an outflow of phosphorus by adding acid to the sludge generated in the method of removing a COD component in waste water through reacting waste water with iron salt and an oxidizing agent in the acidic condition, and by again desolving sludge and returning the resulting solu to the oxidation process.
Patent

Treatment of waste water containing fluorine, phosphoric acid and organic matter

Isamu Kato, +1 more
TL;DR: In this paper, a slaked lime is added to a waste water containing an org. compd., etc., and subjecting the waste water to flocculating treatment.
Patent

Treatment of fluorine-phosphorus-containing discharged water

Akega Haruki, +4 more
TL;DR: In this paper, a discharged water treatment method attaining efficient removal of fluorine and prevention from redissolution of calcium phosphate and capable of surely removing fluorine without using a lot of aluminum compounds in a flocculation reaction process in a post stage.