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Water treatment method and water treatment flocculant

A water treatment and coagulant technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of reducing the amount of water, realizing the membrane separation treatment, and improving the membrane fouling index

Active Publication Date: 2012-05-23
KURITA WATER INDUSTRIES LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, from high COD above 1000mg / L Mn It is economically and technically difficult to start from the problem of the large amount of waste liquid that needs to be treated and the problem that the sediment tends to form rubbery lumps and stick to the equipment wherever it reaches.

Method used

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  • Water treatment method and water treatment flocculant
  • Water treatment method and water treatment flocculant
  • Water treatment method and water treatment flocculant

Examples

Experimental program
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Embodiment

[0134] Hereinafter, the present invention will be described more specifically by giving examples.

[0135] In addition, "%" below shows "weight%".

[0136] In addition, hereinafter, for a sample prepared according to the above-mentioned , the melting point measured according to the above-mentioned is simply referred to as "melting point", and the catalog data value of the resin or not The melting point measured by dissolving the sample resin in an alkali solution is called "primary resin melting point".

[0137] [Manufacture of secondary reaction phenolic resin alkali solution]

[0138] As raw material resins, "Reyototsup PSM-6358 and PSM-4324" manufactured by Qunei Chemical Industry Co., Ltd. were used. This product is a novolac type phenolic resin obtained by polycondensing phenol and formaldehyde in the presence of an acid catalyst. Melting point, weight average molecular weight, low molecular weight component content, etc. are shown below.

[0139] Table 1

[0140] ...

Embodiment I-1

[0143] Put 41g of PSM-6358, 146.2g of ion-exchanged water and 12.8g of 48% sodium hydroxide aqueous solution in a beaker, stir and dissolve with a magnetic stirrer, and obtain 200g of novolak-type phenolic resin base containing 20.5% of PSM-6358 solution. The pH of the solution was 12.4.

[0144] Put 100g of PSM-6358 lye into a 200mg / L Erlenmeyer flask with stopper (co-embolization), add 4.43g of 37% formaldehyde aqueous solution after heating to about 60°C, spray the condenser and stirring with nitrogen The tube and the thermometer were installed on the plug, and the formaldehyde addition polycondensation reaction of the resole type was carried out at a liquid temperature of 85° C. through an oil bath for 8 hours (secondary reaction of the resole type). In addition, the amount of formaldehyde used here is equivalent to 28 mol% (PSM-6358 is 20.5g, 20.5÷106=0.193mol; formaldehyde is 4.43×0.37 = 1.64 g, 1.64 ÷ 30 = 0.055 mol, therefore 0.055 ÷ 0.193 = 0.28). Then, this was co...

Embodiment I-2

[0146] Except for using PSM-4324 instead of PSM-6358, the same operation was performed as in Example I-1 to obtain a secondary reaction phenolic resin alkali solution (hereinafter referred to as "synthetic product B of the present invention").

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Abstract

Provided is a water treatment method which uses a water treatment flocculant comprising a phenol resin-based alkali solution, and with which there is very little secondary pollution due to flocculation residue. The water treatment method involves adding the flocculant to the water to be treated and subjecting the product to membrane separation. The flocculant is formed from an alkali solution of a phenol resin having a melting point between 130 C and 220 C. The water treatment flocculant is obtained by adding an aldehyde to an alkali solution of a novolak phenol resin obtained by reacting a phenol and an aldehyde in the presence of an acid catalyst, and then performing a resol-type secondary reaction in the presence of an alkali catalyst.

Description

technical field [0001] The invention relates to a water treatment coagulant formed from an alkaline solution of phenolic resin and a water treatment method using the water treatment coagulant. Specifically, it relates to an alkaline solution of a phenolic resin whose melting point is 130 to 220° C., which is 50 to 100° C., which is much higher than the melting point of a general novolak-type phenolic resin, and which causes little secondary pollution by coagulation residues. Formed coagulant for water treatment, and water treatment method for performing membrane separation treatment on water to be treated to which the coagulant for water treatment is added, especially effective for water treatment using reverse osmosis (RO) membrane separation treatment water treatment methods. [0002] The invention also relates to a manufacturing method of the coagulant for water treatment. Background technique [0003] Novolak-type phenolic resin is also called "Bakelite resin" related ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01C02F1/44C02F1/52C02F1/56C08G8/00C08G8/04
CPCC02F1/441C02F9/00C08L61/06C08G8/04C02F1/56C02F1/44
Inventor 大井康裕多田景二郎阿部幸雄饭塚毅北野智
Owner KURITA WATER INDUSTRIES LTD
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