Polyurethane filler as well as preparation method and application thereof

A technology of polyurethane filler and polyurethane foam is applied in chemical instruments and methods, water treatment parameter control, aerobic and anaerobic process treatment, etc. To achieve the effect of promoting attachment and proliferation, promoting rapid proliferation, and promoting rapid growth

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sponge iron, activated carbon and polyurethane foam in the filler rely on the adhesive bonding of the polyurethane foam itself, and the bonding force is weak. When subjected to hydraulic impact, the filler structure is easily damaged, and the activated carbon and iron powder are easy to flow out with the effluent, causing the system to fail. Stable, but there are certain limitations in practical applications

Method used

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  • Polyurethane filler as well as preparation method and application thereof
  • Polyurethane filler as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Calculated in parts by weight, weigh 36 parts of polyvinyl alcohol, 24 parts of sodium alginate, 6 parts of calcium chloride; weigh Na 2 SO 3 1.5 parts, FeCl 2 (calculated as Fe) and 1 part of hydroxylamine; add 200 parts of distilled water together, stir and dissolve to form a cross-linking mixed solution, and stir evenly.

[0045] Add 50 parts of polyester polyol, 50 parts of polyisocyanate, 100 parts of water, 20 parts of tetramethylethylenediamine catalyst, 35 parts of surfactant and 15 parts of foaming agent into the container, stir at high speed for 2 seconds, and then add in proportion The prepared cross-linking mixed solution is used to control the proportion of active ingredients in the molded polyurethane filler. After stirring for 2 minutes, it is poured into a mold for molding, and then it is stored in a refrigerator at 0°C for 48 hours to obtain a slow-release polyurethane filler.

[0046] use as figure 1 In the reactor device shown, the prepared slow-re...

Embodiment 2

[0065] Filler and reactor size, form are all identical with embodiment 1, adopt such as figure 2 The reactor device shown, the reactor has the functions of aeration and dissolved oxygen control, and the influent is NH-containing 4 + -N 200mg / L simulated water distribution, control the dissolved oxygen concentration in the reactor to be below 0.3mg / L, other operating conditions are the same as in Example 1, sampling and monitoring system influent ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, etc. Indicators, the total nitrogen in the initial system effluent is higher than that in the influent, and on the fifth day, the effluent ammonia nitrogen is 120mg / L, the nitrite nitrogen is 61mg / L, the nitrate nitrogen concentration is 12mg / L, and the total nitrogen in the effluent is lower than that in the influent The concentration of total nitrogen and nitrate nitrogen in the effluent reached a maximum of 20mg / L on the 10th day. By the 45th day, the system showed the denitrif...

Embodiment 3

[0071] Calculated in parts by weight, weigh 36 parts of polyvinyl alcohol, 24 parts of sodium alginate, 6 parts of calcium chloride; weigh Na 2 SO 3 0.5 parts, FeCl 2 and 0.5 parts of hydroxylamine; add 200 parts of distilled water together, stir and dissolve to form a cross-linking mixed solution, and stir evenly.

[0072] Add 50 parts of polyester polyol, 50 parts of polyisocyanate, 100 parts of water, 20 parts of tetramethylethylenediamine catalyst, 35 parts of surfactant and 15 parts of foaming agent into the container, stir at high speed for 2 seconds, and then add the prepared After continuing to stir for 2 minutes, the crosslinking mixed solution was poured into a mold for molding, and then it was stored in a refrigerator at 0° C. for 48 hours to obtain a slow-release polyurethane filler.

[0073] Using the same UASB reactor as in Example 1 and the same operating conditions to start the anaerobic ammonium oxidation reaction, the initial system effluent ammonia nitroge...

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Abstract

The invention provides a polyurethane filler as well as a preparation method and application thereof. The polyurethane filler provided by the invention comprises polyurethane foam, Na2SO3, bivalent iron salt, hydroxylamine and a cross-linking agent. The slow-release polyurethane filler provided by the invention has good overall flexibility, can be cut at will to adapt to reactors with different sizes and shapes, and can improve the starting speed of the reactor and enhance the impact resistance.

Description

technical field [0001] The invention relates to a polyurethane filler and its preparation method and application. Background technique [0002] Anaerobic nitrogen oxidizing bacteria in the process of anammox 2 as carbon source, with NO 2 - As electron acceptor, NH4 + As an electron donor, nitrogen gas is generated (a small amount of nitrate nitrogen by-product) to realize denitrification of wastewater. The process of oxidation and reduction of ammonia nitrogen to nitrogen is greatly shortened, and compared with the traditional nitrification-denitrification process, it saves a lot of energy and materials, and saves operating costs. Although ANAMMOX has many advantages, there are still many problems in practical application. Anaerobic nitrogen oxidizing bacteria are a type of slow-growing microorganisms with a generation cycle of about 11 days. They are sensitive to light and oxygen, and have strict requirements on the living environment, resulting in a long start-up time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/04C08L75/06C08L29/04C08L5/04C08K3/16C08K3/30C08K3/28C02F3/30
CPCC08J9/04C08J9/0061C08J9/0066C02F3/307C08J2375/06C08J2429/04C08J2405/04C08K2003/162C08K2003/3045C08K3/28C08K3/16C02F2203/006C02F2209/14C02F2209/15C02F2209/16
Inventor 曹宗仑孙杰龚小芝郦和生杨晏泉张英雄
Owner CHINA PETROLEUM & CHEM CORP
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