WO2008047739A1 - Procédé de déshydratation de boue d'égouts - Google Patents

Procédé de déshydratation de boue d'égouts Download PDF

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Publication number
WO2008047739A1
WO2008047739A1 PCT/JP2007/070042 JP2007070042W WO2008047739A1 WO 2008047739 A1 WO2008047739 A1 WO 2008047739A1 JP 2007070042 W JP2007070042 W JP 2007070042W WO 2008047739 A1 WO2008047739 A1 WO 2008047739A1
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WO
WIPO (PCT)
Prior art keywords
sludge
monomer
dewatering
cationic
sewage sludge
Prior art date
Application number
PCT/JP2007/070042
Other languages
English (en)
Japanese (ja)
Inventor
Takafumi Inaba
Yoshio Mori
Original Assignee
Mt Aquapolymer, Inc.
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 Mt Aquapolymer, Inc. filed Critical Mt Aquapolymer, Inc.
Priority to JP2008539796A priority Critical patent/JPWO2008047739A1/ja
Priority to CN2007800380545A priority patent/CN101522582B/zh
Publication of WO2008047739A1 publication Critical patent/WO2008047739A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances

Definitions

  • the present invention relates to a method for dewatering sewage sludge having excellent coagulation power and dewaterability, and having excellent various coagulation and dewatering performances.
  • Patent Document 1 (2) Sludge dewatering method using organic sludge having a pH of 5 to 8 in combination with an attalylate cationic high molecular flocculant and an amphoteric polymer flocculant (see Patent Document 2), (3) A dehydration method in which an inorganic flocculant is added to sludge and the pH is set to less than 5, and an anion rich amphoteric high molecular flocculant with a specific composition is added (Patent Document 3) and (4) An inorganic flocculant and an anion An organic wastewater treatment method (see Patent Document 4) in which a functional polymer flocculant and a cation rich amphoteric polymer flocculant are sequentially added is known.
  • Patent Document 1 Japanese Patent Publication No. 5-56199 (Claims)
  • Patent Document 2 Japanese Patent No. 2933627 (Claims)
  • Patent Document 3 Japanese Patent Publication No. 6-239 (Claims)
  • Patent Document 4 Japanese Patent Laid-Open No. 6-134213 (Claims)
  • sludge with a high excess sludge ratio generated in sewage treatment has a high cation requirement, and thus may not be able to cope with conventional polymer flocculants and sludge dewatering methods.
  • sludge with a high excess sludge ratio generated in sewage treatment has a high cation requirement, and thus may not be able to cope with conventional polymer flocculants and sludge dewatering methods.
  • CF coarse suspended solids
  • SS floating substances
  • an object of the present invention is to provide a sludge dewatering method having excellent coagulation dewatering performance without using polyamidine for sludge having a large amount of surplus sludge with a small amount of coarse suspended matter as described above.
  • the present inventor is primary sludge generated by sewage treatment, surplus sludge, or mixed sludge of surplus sludge and primary sludge.
  • CF coarse suspended solids
  • SS coarse suspended solids
  • Item 1 A method of dewatering sewage sludge, wherein the sewage sludge is primary sludge generated by sewage treatment, excess sludge, or a mixture of primary sludge and excess sludge, and suspended solids (SS) The ratio of coarse suspended solids (CF) to sewage sludge is 15% by mass or less, and the sewage sludge contains a cationic monomer having an allyloyl group in all constituent monomer units without using polyamidine.
  • a method for dewatering sewage sludge comprising adding a cationic polymer flocculant containing a polymer having 65 mol% or more and then dehydrating.
  • Item 2 The method of dewatering sewage sludge according to Item 1, wherein the sludge is a mixed sludge of excess sludge and primary sludge.
  • Item 3 The method for dewatering sewage sludge according to Item 1 or Item 2, wherein the loss on ignition (VTS) in the sludge is 70% TS (TS is an evaporation residue) or more.
  • VTS loss on ignition
  • Item 4 The method for dewatering sewage sludge according to any one of Items 1 to 3, wherein the cation demand of the sewage sludge is measured, and the cationic polymer flocculant is added according to the result.
  • Item 5 The method for dewatering sewage sludge according to Item 4, wherein 0.05 to 5% by mass of the cationic polymer flocculant is added to the evaporation residue (TS) in the sewage sludge.
  • the cationic polymer flocculant comprises: (1) [1] Tertiary or quaternary salt of dialkylalkylalkyl acrylate as the cationic monomer, and attaly as the nonionic monomer.
  • the method for dewatering sewage sludge according to any one of Items 1 to 5, which is an amphoteric polymer selected from the group consisting of:
  • attalylate or metatalylate is represented as (meth) acrylate
  • acrylamide or methacrylamide is represented as (meth) acrylamide
  • acrylic acid or metatalariate
  • Luric acid is represented as (meth) acrylic acid
  • acrylonitrile or methatalonitrile is represented as (meth) acrylonitrile.
  • the cationic polymer flocculant used in the present invention is a polymer having 65 mol% or more of a cationic monomer having an alitaroyl group in all the constituent monomer units. (Hereinafter simply referred to as “polymer”).
  • the polymer is preferably a polymer having 80 to 100 mol% of a cationic monomer having an allyloyl group.
  • the sewage sludge containing crude suspended solids (CF) with a suspended solids (SS) ratio of 15% by weight or less (primary sludge, excess sludge, or primary sludge and surplus generated by sewage treatment) Excellent cohesiveness and dewaterability in dewatering of sludge mixed sludge)
  • Examples of the polymer include a cationic polymer having a cationic monomer unit having an attailoyl group as an essential constituent monomer unit and, if necessary, a nonionic monomer unit.
  • a cationic polymer having a cationic monomer unit having an attailoyl group as an essential constituent monomer unit and, if necessary, a nonionic monomer unit Alternatively, an amphoteric polymer containing a cationic monomer unit and an anionic monomer unit, and optionally having a nonionic monomer unit can be mentioned. These polymers may be used singly or as a mixture of two or more.
  • a cationic butyl monomer having an alitaroyl group is preferred. Specifically, dimethylaminoethyl acrylate, jetyl aminoethyl acrylate and jetylamino-2-hydroxypropyl are preferred.
  • Tertiary salts such as hydrochlorides and sulfates of dialkylaminoalkyl acrylates such as atarylates; alkyl halides such as methyl chloride adducts of dialkylaminoalkyl acrylates and aralkyl halides such as benzyl adducts Quaternary salts such as adducts; N, N-dimethyla Hydrochlorides such as dialkylaminoalkylacrylamides such as minopropylacrylamide and tertiary salts such as sulfates; alkyl halides such as methyl chloride adducts of dialkylaminoalkylacrylamide and aralkyl halides such as benzyl chloride adducts Examples include quaternary salts such as adducts.
  • a cationic monomer having a methacryloyl group can be used in combination as long as the effect of the present invention is not impaired.
  • the cationic monomer having a methacryloyl group dimethylaminoethyl methacrylate, jetylaminoethyl methacrylate, and jetylamino-2-hydroxypropyl methacrylate are preferred, which are cationic bullet monomers having a methacryloyl group.
  • Tertiary salts such as hydrochlorides and sulfates of dialkylaminoalkyl metatalylates such as alkyl halides such as methyl chloride adducts of alkylaminoalkyl metatalylates and aralkyl halides such as benzil chloride adducts Quaternary salts such as adducts; Hydrochloric acid salts such as dialkylaminoalkyl methacrylamide such as N, N-dimethylaminopropyl methacrylamide and tertiary salts such as sulfates; Methyl chloride adducts of dialkylaminoalkyl methacrylamide Alkyl halide adducts such as Examples include quaternary salts such as halogenated aralkyl adducts such as benzyl adducts.
  • the anionic monomer is preferably an anionic bur monomer.
  • (meth) acrylic acid and alkali metal salts or ammonium salts such as sodium salts; maleic acid and the like and alkalis thereof.
  • examples thereof include metal salts; acrylamide alkylalkanesulfonic acids such as acrylamide-2-methylpropanesulfonic acid and alkali metal salts or ammonium salts thereof; and vinylsulfonic acids and alkali metal salts or ammonium salts thereof.
  • Nonionic monomers are preferred as nonionic monomers. Specifically, (meth) acrylamide, dimethylaminoethyl (meth) acrylate, etc. dialkylaminoalkyl (meth) acrylate, dialkyl Dialkylaminoalkyl (meth) acrylamides such as aminopropyl (meth) acrylamide, styrene, acrylonitrile, butyl acetate, alkyl (meth) acrylate, alkoxyalkyl (meth) acrylate, bulupyridine, buriumidanol and allylamine Can do. Of these, (meth) acrylamide is preferred. Good.
  • a polymer obtained by polymerizing the above monomer in the presence of an alkylene oxide oligomer having an ethylenically unsaturated group can also be used.
  • a cationic polymer in the case of a cationic polymer, [1] a tertiary or quaternary salt of dialkylaminoalkyl acrylate as a cationic monomer, and a nonionic monomer A copolymer comprising acrylamide as a monomer, and [2] a tertiary salt or quaternary salt of a dialkylaminoalkyl acrylate as a cationic monomer and a tertiary or quaternary salt of a dialkylaminoalkyl metatalylate,
  • the nonionic monomer include a copolymer made of acrylamide.
  • a tertiary or quaternary salt of dialkylaminoalkyl phthalate as a cationic monomer, an acrylate as an anionic monomer, and a nonionic monomer A copolymer consisting of acrylamide as a body, and [2] tertiary or quaternary salt of a dialalkylaminoalkyl acrylate as a cationic monomer and a tertiary or quaternary salt of a dialkylaminoalkyl methacrylate as an anion
  • copolymers composed of acrylate as a functional monomer and acrylamide as a nonionic monomer There are copolymers composed of acrylate as a functional monomer and acrylamide as a nonionic monomer.
  • the proportion of the copolymerization ratio of the cationic monomer unit and the aionic monomer unit in the amphoteric polymer may be appropriately set according to the purpose, and the cationic monomer unit and the anionic property may be sufficient. based on the total amount of monomer unit, is preferably it is cationic monomer units is 70 to 95 mole 0/0 and Anion monomer units 5 to 30 mol 0/0! /,. The nonionic monomer unit is preferably 5 mol% or less based on the total monomer units.
  • the 0.5% salt viscosity means that a sample obtained by dissolving 0.5% of a polymer in a 4% sodium chloride aqueous solution at 25 ° C., and rotor No. 1 or 2 is measured with a B-type viscometer. Used to refer to the value measured at 60 rpm.
  • the method for producing the polymer is not particularly limited, and the above-described monomers are generally used. Standard polymerization methods can be employed. For example, in the case of aqueous solution polymerization, potassium persulfate, ammonium persulfate, 2,2′-azobis (2-amidinopropane) dihydrochloride, a redox polymerization initiator, etc. are used as polymerization initiators. It is also possible to carry out photo radical polymerization by ultraviolet irradiation using a method of carrying out thermal radical polymerization or an azo compound, benzoin and a photophenone type photopolymerization initiator. In the case of reverse-phase emulsion polymerization, the polymerization may be carried out using a water-insoluble initiator such as azobisisoptyronitrile or benzoyl peroxide in addition to the polymerization initiator.
  • a water-insoluble initiator such as azobisisoptyronitrile or benzoyl peroxide
  • the gel-like polymer obtained is then cut and chopped by a known method.
  • the chopped polymer is dried at a temperature of 60 to 150 ° C using a dryer such as a band dryer, a rotary dryer, a far-infrared dryer, or a vibratory fluid dryer. It is pulverized with a pulverizer or the like to obtain a powdery polymer, and the particle size is adjusted.
  • reverse phase emulsion polymerization it is diluted with water and phase-inverted and used as an oil-in-water emulsion.
  • polymer flocculant of the present invention either a powdery product or a reversed phase emulsion product can be used.
  • the present invention relates to a method for dewatering sludge, characterized in that the predetermined polymer flocculant without using polyamidine is added to a predetermined sewage sludge and then dehydrated.
  • the target sludge of the present invention is sewage sludge selected from primary sludge generated by sewage treatment, surplus sludge, and mixed sludge of surplus sludge and primary sludge, and has a small amount of coarse suspended matter! /, Sludge It is mud.
  • mixed sludge having a high surplus ratio is exemplified, and specifically, sludge having a surplus ratio of 5 SS% or more, preferably 5 to 40 SS%.
  • the coarse suspended solids in the present invention are the weight fraction of suspended solids (SS) in terms of the loss of ignition of solids on the sieve when the sludge is sieved with a 0.074mm (200 mesh) sieve. (% SS).
  • the initial settling sludge means the sludge in which the solid content in the sewage flowing into the first settling basin has a higher specific gravity than the water settled and concentrated, and the excess sludge is the first settling treatment. It means sludge generated by aerobic biological treatment of the treated sewage.
  • the method of measuring the required amount of cation in sewage sludge and adding a high molecular flocculant according to the result can be performed efficiently and without waste. This is preferable because it is possible.
  • the required amount of cation in the sewage sludge is 0.05-0.9 meq / g-TS force S, more preferably 0.20-0.85 meq / g-TS, which can be easily treated.
  • the required amount of cation is a value measured using a known photolabeled cationic polymer described in JP-A No. 2000-258407.
  • the sludge dewatering method of the present invention can be preferably applied to sludge whose loss on ignition (VTS) in sewage sludge is 70% TS or more, and further about 70 to 85% TS.
  • VTS loss on ignition
  • the loss on ignition represents the amount of sludge evaporation residue reduced to 600 ° C and is an indicator of the amount of organic matter in the sludge solids.
  • the dehydration method using the flocculant of the present invention is to add a flocculant to sludge and thereby form a sludge floc.
  • the flock formation method may follow a known method.
  • flocculant in addition to the above-mentioned polymer flocculant, if necessary, other flocculants such as inorganic flocculants, anionic polymer flocculants, etc.
  • An agent can be used in combination.
  • the amount of other flocculant used is 1000% by mass or less, preferably 100% by mass or less, based on the total flocculant.
  • Examples of the inorganic flocculant include aluminum sulfate, polyaluminum chloride, ferric chloride, ferrous sulfate, and polyiron sulfate.
  • pH adjustment if the pH value is satisfied after the inorganic flocculant is added, pH adjustment is not particularly required, but if the range limited in the present invention is not satisfied, an acid or an alcohol is used. Adjust by adding strength.
  • Examples of the acid include hydrochloric acid, sulfuric acid, acetic acid, and sulfamic acid.
  • alkali include caustic soda, caustic potash, slaked lime, and ammonia.
  • Examples of the anionic polymer flocculant that is one of the other flocculants include a homopolymer of the anionic monomer described above and a copolymer of the anionic monomer and the nonionic monomer described above. It is possible to give power S.
  • a polymer flocculant and other polymer flocculants are used in combination, it is preferable that the total amount of all the polymer flocculants satisfies the addition ratio.
  • the amount of sludge dewatering agent and other flocculant added, the stirring speed, the stirring time, and the like may be according to conventional dehydrating conditions.
  • the flocs thus formed are dehydrated using a known means to obtain a dehydrated cake.
  • Examples of the dehydrator include a screw press type dehydrator, a belt press type dehydrator, a filter press type dehydrator, a screw decanter, and the like.
  • polymer flocculant a powdery polymer, a copolymer of dimethylaminoethyl acrylate dimethyl chloride adduct and acrylamide (hereinafter referred to as "DAA system") shown in Table 1 below, And a homopolymer of dimethylaminoethyl metatalylate methyl chloride adduct (hereinafter referred to as “DAA system”) shown in Table 1 below, And a homopolymer of dimethylaminoethyl metatalylate methyl chloride adduct (hereinafter referred to as “DAA system”) shown in Table 1 below, And a homopolymer of dimethylaminoethyl metatalylate methyl chloride adduct (hereinafter referred to as “DAA system”) shown in Table 1 below, And a homopolymer of dimethylaminoethyl metatalylate methyl chloride adduct (hereinafter referred to as “DAA system”) shown in Table 1 below
  • DAC dimethylaminoethyl atylate methyl chloride adduct
  • AM acrylamide
  • the ultraviolet irradiation apparatus was adjusted so that the irradiation intensity was 0.4 mW / cm 2 .
  • the reaction started within 1 minute and reached the maximum temperature after about 7 minutes. After reaching the maximum temperature, irradiation was continued for 20 minutes, and then it was removed from the apparatus and allowed to cool.
  • the gel polymer was taken out from the container, put into a meat chopper, cut, and dried at 60 ° C for 10 hours. After cooling, it was pulverized with a mill to obtain a powdery polymer flocculant.
  • the ratio of DAC and AM in Production Example A was changed to the following, and polymerization was performed according to the method of Production Example A.
  • the obtained polymer was cut, dried and pulverized in the same manner as in Production Example A to obtain a powdery polymer flocculant.
  • a 10 wt% aqueous solution of V-50 is 400 ppm in terms of solid content with respect to all monomers, and 10% of SHS.
  • the obtained polymer was subjected to the same method as in Production Example A, and was cut, dried and pulverized to obtain a powdery polymer flocculant.
  • the 0.5% salt viscosity is 25% for a sample prepared by dissolving 0.5% of a polymer in a 4% aqueous sodium chloride solution.
  • the measurement was performed at 60 rpm using a rotor No. 1 or 2 with a B-type viscometer at ° C.
  • Comparative Example 3 using the polymer flocculant F consisting only of a monomer having a methacryloyl group a floc having a sufficient particle size cannot be obtained with an addition amount equivalent to that in Examples 1 to 3, and good dehydration cannot be achieved. There wasn't.
  • Example 4 the floc shape, the filtration rate, the clarification of the filtrate, and the moisture content of the cake were all good, and the processability was excellent. In particular, in Examples 4 and 5, the filterability was excellent (the filtration rate was high).
  • Comparative Example 4 using the polymer flocculant D in which the copolymerization ratio of the cationic monomer is low, the floc diameter increases. Therefore, filterability and moisture content were inferior to those of the examples.
  • Comparative Example 5 using the polymer flocculant F consisting only of a monomer having a metataliloyl group, a floc having a sufficient particle size cannot be obtained with an equivalent addition amount compared to Examples 4 to 6, and is relatively high. Addition amount was required.

Abstract

L'invention vise à mettre à disposition un procédé de déshydratation de boue présentant d'excellentes performances d'agrégation et de déshydratation sur une boue contenant peu de matières flottantes grossières et présentant un taux élevé de boue en excès. L'invention concerne plus précisément un procédé de déshydratation de boue d'égouts, la boue d'égouts étant une boue de première précipitation formée par un traitement d'évacuation d'égouts, une boue en excès ou une boue mixte comprenant une boue de première précipitation et une boue en excès présentant un rapport de matières flottantes grossières (CF : coarse float) aux solides en suspension (SS) inférieur ou égal à 15% en masse, le procédé étant caractérisé en ce qu'il comporte les étapes consistant à ajouter à la boue d'égouts un agent d'agrégation cationique macromoléculaire contenant un polymère comprenant au moins 65% en moles d'un monomère cationique comportant des groupes acryloyle dans toutes ses unités monomériques constitutives, puis à réaliser une déshydratation sans recourir à de la polyamidine.
PCT/JP2007/070042 2006-10-16 2007-10-15 Procédé de déshydratation de boue d'égouts WO2008047739A1 (fr)

Priority Applications (2)

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JP2008539796A JPWO2008047739A1 (ja) 2006-10-16 2007-10-15 下水汚泥の脱水方法
CN2007800380545A CN101522582B (zh) 2006-10-16 2007-10-15 污水污泥的脱水方法

Applications Claiming Priority (2)

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JP2006281271 2006-10-16
JP2006-281271 2006-10-16

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WO2008047739A1 true WO2008047739A1 (fr) 2008-04-24

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5728506B2 (ja) * 2011-02-10 2015-06-03 水ｉｎｇ株式会社 汚泥の凝集方法及び装置
CN102267795A (zh) * 2011-06-17 2011-12-07 中国科学院武汉岩土力学研究所 一种污水处理厂脱水污泥干化方法
CN110104936A (zh) * 2018-01-30 2019-08-09 辽宁德智环保技术有限公司 纳米聚合氯化铝处理发酵污泥的方法
CN108640484B (zh) * 2018-05-31 2020-12-22 东莞市顶盛环保科技有限公司 一种污泥脱水剂的制备方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4921382A (fr) * 1972-06-17 1974-02-25
JPS4952782A (fr) * 1972-09-25 1974-05-22
JPS51147588A (en) * 1975-06-13 1976-12-17 Sumitomo Chem Co Ltd Process for preparing cationic high polymers
JPS62132599A (ja) * 1985-12-04 1987-06-15 Nagaharu Okuno 汚泥脱水における運転制御方法
JP2004099668A (ja) * 2002-09-05 2004-04-02 Toagosei Co Ltd 組成物、高分子凝集剤及び汚泥の脱水方法
JP2005246311A (ja) * 2004-03-05 2005-09-15 Ngk Insulators Ltd 汚泥連続加圧脱水機の運転方法
JP2006096920A (ja) * 2004-09-30 2006-04-13 Dai Ichi Kogyo Seiyaku Co Ltd カチオン性高分子重合体及びカチオン性高分子凝集剤

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3183809B2 (ja) * 1995-08-24 2001-07-09 栗田工業株式会社 汚泥脱水剤
JPH11290900A (ja) * 1998-04-10 1999-10-26 Kurita Water Ind Ltd 有機性汚泥の脱水方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4921382A (fr) * 1972-06-17 1974-02-25
JPS4952782A (fr) * 1972-09-25 1974-05-22
JPS51147588A (en) * 1975-06-13 1976-12-17 Sumitomo Chem Co Ltd Process for preparing cationic high polymers
JPS62132599A (ja) * 1985-12-04 1987-06-15 Nagaharu Okuno 汚泥脱水における運転制御方法
JP2004099668A (ja) * 2002-09-05 2004-04-02 Toagosei Co Ltd 組成物、高分子凝集剤及び汚泥の脱水方法
JP2005246311A (ja) * 2004-03-05 2005-09-15 Ngk Insulators Ltd 汚泥連続加圧脱水機の運転方法
JP2006096920A (ja) * 2004-09-30 2006-04-13 Dai Ichi Kogyo Seiyaku Co Ltd カチオン性高分子重合体及びカチオン性高分子凝集剤

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CN101522582A (zh) 2009-09-02
CN101522582B (zh) 2011-12-21

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