Preparation method for magnetic carrier in processing technique of sewage biological fluidized bed

A technology of biological fluidized bed and magnetic carrier, which is applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of carrier loss and carrier membrane difficulty, and achieve production cost Low, high recovery, high efficiency effect

Inactive Publication Date: 2009-12-09
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing a magnetic carrier used in the biological fluidized bed sewage treatment process in view of the problems that the existing biological fluidized bed carrier is difficult to form a film and the carrier is easy to lose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, add 1 kg of 400-mesh magnetite powder into the reaction kettle, at a stirring speed of 40r / min, add 0.2 kg of 50% dilute sulfuric acid at a constant speed, then add 0.1 kg of 3% glycolic acid solution, stir and mix evenly After that, start to heat up to 65°C, stir and react for 1.5 hours, the reactant begins to solidify, then transfer the reactant to a drying oven and dry at 80°C for 0.5 hour, after cooling, grind it with a grinding mill, and pass through a 100-mesh sieve After separation, a brown-black granular magnetic carrier was obtained.

[0018] Prepare simulated domestic sewage in the laboratory, COD is 952mg / L~1120mg / L, NH 3 -N is 53mg / L~78mg / L, TP is 5mg / L~8mg / L, after inoculating activated sludge in the three-phase fluidized bed reactor, add 10g / L magnetic carrier to aerate and cultivate the hanging film for one week After the biofilm grows, the quality of the influent and effluent water is stable after half a month. The gap type adopts the magnetic dr...

Embodiment 2

[0020] First, add 1 kg of 200-mesh iron oxide scale into the reaction kettle, and evenly add 1 kg of 30% dilute hydrochloric acid at a stirring speed of 100r / min, then add 0.5 kg of 50% acetic acid solution, stir and mix evenly, and then heat slowly Raise the temperature to 80°C, stir and react for 2 hours, the reactant begins to solidify, then transfer the reactant to a drying oven and dry at 100°C for 1 hour. Yellow granular magnetic carrier.

[0021] In the laboratory for the biochemical effluent of a chemical plant, COD is 81mg / L~120mg / L, NH 3 -N is 78mg / L~112mg / L, TP is 5mg / L~9.2mg / L, and the magnetic carrier biofluidized bed process is used to simultaneously remove nitrogen and phosphorus in the laboratory test. Inoculate the sludge in the three-phase fluidized bed reactor, add 20g / L magnetic carrier, and then aerate the culture. After 10 days, the biofilm grows. The magnetic drum separator is used to remove the aging biofilm on the surface of the magnetic carrier, and ...

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Abstract

The invention discloses a preparation method for a magnetic carrier in a processing technique of a sewage biological fluidized bed, which comprises the following steps: (1) magnetic powder is added into a reaction kettle; in the stirring speed of 40 to 100 r / min, inorganic acid and organic acid are sequentially added and heated till the temperature is risen to 65 to 80 DEG C and the reaction lasts for 1.5 to 2 hours; (2) reactant is transferred to a dying cabinet, dried for 0.5 to 1 hours in the temperature of 80 to 100 DEG C, anhydrated, cooled and then crushed by a grinding crusher and sieved with a mesh screen with 100 meshes to obtain granular magnetic carriers. The preparation method has simple process route, low energy consumption, high efficiency and low cost. The magnetic carrier obtained by the preparation method is a shell structure; microorganisms easily grow biological membranes on the magnetic carrier; residual biological membranes can be removed by a magnetic drum separator, thus avoiding the huge loss of organisms. The biological fluidized bed using the magnetic carrier is suitable for fields such as standard reaching discharging treatment of town sewage, synchronous denitrification and dephosphorization of high nitrogen and phosphorus medical waste water, nitrification and denitrification of garbage percolate, coking wastewater and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a preparation method of a magnetic carrier used in a biological fluidized bed sewage treatment process. The magnetic carrier is easy to grow biofilms, can increase the sludge concentration in the biological fluidized bed, and improve the efficiency of sewage treatment. In addition, The magnetic carrier facilitates the removal and renewal of excess biofilm on the carrier through magnetic separation technology, reducing the loss of the carrier. Background technique [0002] The components of pollutants in sewage are complex, mostly organic pollutants. Biological method is usually the most economical and effective method for sewage treatment, and biological method is divided into two categories: activated sludge method and biofilm method. Activated sludge method The process is mature, the operation and management are convenient, and the application is relatively wide. About 40% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10C02F3/12H01F1/11H01F1/36
CPCY02W10/10
Inventor 徐灏龙王长智
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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