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Processes for dewatering digested sewage sludge

A technology for digesting sludge and sewage, applied in chemical instruments and methods, sludge treatment, separation methods, etc., can solve the problems of being unsuitable for centrifugal dehydrators, moving, etc., and achieve excellent clarification, reduced usage, and flocculation excellent filterability

Active Publication Date: 2009-09-02
MT AQUAPOLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when these dehydrators are used, if firm flocs are not formed, there will be a problem that the broken flocs will move to the filtrate through the holes of the punched metal, and it is not suitable for dehydration using a centrifugal dehydrator. room for improvement

Method used

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  • Processes for dewatering digested sewage sludge
  • Processes for dewatering digested sewage sludge
  • Processes for dewatering digested sewage sludge

Examples

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Embodiment

[0107] Hereinafter, an Example and a comparative example are given, and this invention is demonstrated more concretely. It should be noted that in the following content, "%" refers to "mass%" unless otherwise specified.

[0108] The cation equivalent value (Cv) and 0.5% salt concentration of the high molecular coagulant (polymer) were measured as follows.

[0109] [Measurement of Cv]

[0110] (1) Titration method

[0111] Measure 90 ml of deionized water in a conical beaker, add 10 ml of a 500 ppm sample solution, adjust the pH to 4.0 with aqueous hydrochloric acid, and stir for about 1 minute. Next, add 2 to 3 drops of toluidine blue indicator, and titrate with N / 400 polyvinyl potassium sulfate reagent (hereinafter referred to as N / 400PVSK). The titration speed is 2ml / min, and the time point when the water changes from blue to purple and remains for more than 10 seconds is taken as the end point.

[0112] (2) Preparation of sample 500ppm aqueous solution

[0113] Accurat...

manufacture example A

[0121] Using 79wt% aqueous solution of dimethylaminoethyl acrylate chloride addition product (hereinafter referred to as "DAC"), 40wt% aqueous solution of acrylamide (hereinafter referred to as "AM") and ion-exchanged water, the monomer concentrations were respectively 80mol%, 20mol%, and mixed so that the monomer concentration is 50wt%, and the total amount reaches 450ml.

[0122] It was degassed in a nitrogen flow for more than 30 minutes and adjusted to 15°C. A 10 wt % aqueous solution of 2,2'-azobisisobutylamidine dihydrochloride (hereinafter referred to as "V-50") was added at 1000 ppm in terms of solid content relative to the total monomers, and the total monomers , A 5% aqueous solution of 15 ppm of sodium metabisulfite (hereinafter referred to as "SHS") was added in terms of solid content.

[0123] Put it in and adjust the irradiation intensity to 0.4mW / cm 2 in the ultraviolet irradiation device. The reaction started within 1 minute and reached a maximum temperature...

manufacture example B

[0126] In Production Example A, instead of DAC and AM, dimethylaminoethyl methacrylate chloride addition product was changed to 100 mole%, monomer concentration was 74wt%, V-50 was 400ppm and SHS was 5ppm, according to Production Example A method for aggregation.

[0127] The obtained polymer was cut, dried and pulverized in the same manner as in Production Example A to obtain a powdery polymer coagulant.

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Abstract

The invention provides processes for dewatering digested sewage sludge which can give floc excellent in aggregation, filterability and the clarity of separated liquid with reduction in the amount of flocculant used and which brings about lowering in the water content of dehydrated cake. The invention relates to a process for dewatering digested sewage sludge which is characterized by adding a cationic polymer flocculant containing a polymer which contains cations in an amount of 4.0meq / g or above and exhibits a 0.5% salt viscosity of less than 40mPa s to digested sewage sludge and then dewatering the resulting sludge with a belt press or filter press; and a process for dewatering digested sewage sludge which is characterized by subjecting digested sewage sludge to centrifugal dehydration without an inorganic flocculant either while or after adding a cationic polymer flocculant containing a polymer which contains cations in an amount of 4.0meq / g or above and exhibits a 0.5% salt viscosity of 40mPa s or above to the sludge.

Description

technical field [0001] The present invention relates to a method for dehydrating sewage digested sludge with excellent cohesion and dehydration properties, high filtration speed, and various coagulation and dehydration performances such as excellent flocs (agglomerates). Background technique [0002] Sewage, organic sludge produced by excrement treatment plants and organic industrial drainage, etc., is dehydrated by adding polymer coagulants and using dewatering devices such as screw presses, screw decanters, and belt dehydrators. [0003] The sludge filter cake (ケ—キ) after dehydration treatment has been filled and incinerated, but by reducing the moisture content in the sludge filter cake by 1%, the cost of fuel used in incineration can be reduced by about 10%. , Therefore, in order to reduce the water content in the sludge filter cake, various studies have been carried out. [0004] However, in sewage treatment plants, when the content of organic components contained in t...

Claims

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Application Information

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IPC IPC(8): C02F11/14B01D21/01C02F11/12C02F11/147
CPCC02F1/56B03D3/06C02F11/14C02F11/147
Inventor 稻叶孝文森嘉男
Owner MT AQUAPOLYMER
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