Process and apparatus for producing entrapping immobilization pellets
a technology of immobilization pellets and processing equipment, which is applied in the direction of biological water/sewage treatment, filtration separation, and separation processes, etc., can solve the problems of reduced strength of pellets, difficult cost of polymerization in oxygen-free atmosphere, and reduced polymerization stability, so as to achieve high-quality, efficient treatment
Inactive Publication Date: 2009-07-23
HITACHI PLANT TECH LTD
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- Description
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Benefits of technology
[0010]The present invention has been achieved in view of such circumstances. An object of the present invention is to provide a process and an apparatus for producing entrapping immobilization pellets which can produce a large amount of entrapping immobilization pellets having highly stable quality inexpensively by high-speed treatment, entrapping immobilization pellets, and wastewater treatment equipment using the pellets.
[0050]As described above, the present invention can produce a large amount of entrapping immobilization pellets with highly stable quality inexpensively by high-speed treatment.
Problems solved by technology
However, since entrapping immobilization pellets are produced in a large amount, it is difficult in terms of cost to carry out the polymerization in an oxygen-free atmosphere as described above.
The sheet forming of Japanese Patent Application Laid-Open No. 2003-235553 has also a drawback in that polymerization is not stable and the pellets have reduced strength because the mixture has a large interface area in contact with air.
Another drawback is that an unpolymerized substance remains on the sheet surface in contact with oxygen, and the unpolymerized substance is discharged as COD when the pellets are used for wastewater treatment.
Since the formed sheet has unstable quality as described above, when wastewater treatment equipment is packed with entrapping immobilization pellets, the entrapping immobilization pellets cannot sufficiently exhibit their wastewater treatment performance in many cases.
Method used
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[0090]Examples of the present invention will be described below. However, the present invention is not limited to the examples.
[0091]1) The relation between the type of forming method and the amount of COD eluted, 2) the V / S ratio as a shape condition of the forming frame, 3) the pellet deformation ratio, 4) prepolymer properties (molecular weight and concentration), and 5) polymerization conditions (polymerization time and temperature) were examined using the production apparatus 10 of the present invention shown in FIG. 1. As the pellet materials, those of FIG. 1 were mainly used.
TABLE 1Type of materialContentActivated sludgeMLSS 30000 mg / LNumber of nitrifying bacteria5 × 106 cells / mLImmobilizing agentPolyethylene glycol dimethacrylatePolymerization initiatorPotassium persulfate: 0.025 mass %Polymerization acceleratorN,N,N′,N′-tetramethylethylenediamine:0.05 mass %
1) The Relation Between the Type of Forming Method and the Amount of COD Eluted
[0092]Entrapping immobilization pellets...
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Abstract
A large amount of entrapping immobilization pellets with highly stable quality are produced inexpensively by high-speed treatment. There is provided a process for producing entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing agent, the process comprising polymerizing a mixture containing the microorganisms and a solution of the immobilizing agent in a forming frame into a gel to prepare a pellet block.
Description
[0001]This is a Division of application Ser. No. 11 / 445,189 filed Jun. 2, 2006, which claims the benefit of Japanese Patent Application No. 2005-166045 filed Jun. 6, 2005. The disclosures of the prior applications are hereby incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a process and an apparatus for producing entrapping immobilization pellets, entrapping immobilization pellets, and wastewater treatment equipment using the pellets. More particularly, the present invention relates to a process and an apparatus for producing entrapping immobilization pellets suitable for nitrification promoting advanced sewage treatment process in the field of wastewater treatment or the like.[0004]2. Description of the Related Art[0005]Nitrifying bacteria in activated sludge used for wastewater treatment grow slower than common bacteria. In particular, in winter during which water temperatures are lo...
Claims
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IPC IPC(8): B01D39/02C12N11/04
CPCC02F3/108C12N11/08C12N11/04C02F3/348Y02W10/10C12N11/087C12N11/098C02F3/109
InventorABE, NAOKIAOYAMA, KOUTAROUSUMINO, TATSUOEMORI, HIROYOSHIKOUNO, TAKAYUKI
OwnerHITACHI PLANT TECH LTD