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Starch and polycaprolactone blend and preparation method and application thereof

A technology of polycaprolactone and blends, which is applied in the field of preparation of starch and polycaprolactone blends, can solve the problems of lack of economical applicability, high denitrification cost and the like, and can overcome the dosage of carbon sources. It is not easy to control, the cost of denitrification is reduced, and the effect of reducing production cost

Inactive Publication Date: 2011-10-12
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with natural plants rich in cellulose, the cost of denitrification is much higher, and it is not economically applicable at present.

Method used

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  • Starch and polycaprolactone blend and preparation method and application thereof
  • Starch and polycaprolactone blend and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After stirring 55 parts of corn starch, 30 parts of polycaprolactone (molecular weight 60000), 14 parts of water and 1 part of KH-550 silane coupling agent, extrude and granulate in a twin-screw extruder at 130~170℃ .

Embodiment 2

[0026] After stirring 40 parts of corn starch, 40 parts of polycaprolactone (molecular weight 40000), 15 parts of water, 3 parts of wood flour and 2 parts of KH-560 silane coupling agent, in a twin-screw extruder at 130-170 ℃ extrusion granulation.

Embodiment 3

[0028] After mixing 30 parts of tapioca starch, 50 parts of polycaprolactone (molecular weight: 80000), 15 parts of water and 5 parts of wood flour evenly, extrude and granulate in a twin-screw extruder at 130-170°C.

[0029] Denitrification applications of starch / polycaprolactone blends:

[0030] 1. The hanging film of denitrifying microorganisms. The reactor was in a packed bed mode, and the prepared blend particles (particle size: 0.4 cm) were filled in the reactor, and the filling height was two-thirds of the reactor, and water was fed in an upward flow. The activated sludge from the aeration tank of the sewage treatment plant is added to the raw water containing nitrate to domesticate the denitrifying microorganisms. After the denitrification effect is stable, the domestication ends.

[0031] 2. Denitrification and denitrification. After the acclimation, the normal operation of the reactor was started. The optimum temperature for acclimation and operation is 25-30°C. ...

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Abstract

The invention discloses a starch and polycaprolactone blend, a preparation method thereof and application of the blend used as a solid carbon source to the removal of nitrate from water. The preparation method comprises the following steps of: adding additives such as a plasticizer and the like into starch and polycaprolactone which are taken as raw materials, stirring and mixing uniformly, performing one-time extrusion by using a twin-screw extruder, and pelleting to obtain a product. The starch / polycaprolactone blend can be synchronously taken as a denitrification carbon source and a biofilm carrier in water treatment, so that the disadvantages of the use of the conventional liquid denitrification carbon source are overcome; moreover, the cheap starch is added into the blend, so the method has a remarkable economic advantage compared with a method in which the polycaprolactone is used as the solid carbon source. The blend can be applied to biological denitrification fields of surface water containing nitrates which exceed the standard, underground water, advanced treatment of sewage treatment plants and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a starch and polycaprolactone blend and its application as a solid carbon source in removing nitrate in water. Background technique [0002] The nitrogen pollution problem of low organic pollution water is a prominent problem of future environmental pollution after the completion of point source pollution control in my country. With the strict implementation of pollution interception and source control and the strengthening of the operation and management of sewage treatment plants, there will be water pollution problems characterized by low organic pollution and high nitrogen emissions. For example, the effluent of the sewage treatment plant that reaches the Grade A standard is used as the ecological replenishment of the water environment, and it comes from the confluence of surface runoff and non-point sources in the urban ra...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/02C08L97/02C08K5/54B29B9/06B29C47/92C02F3/28B29C48/92
CPCB29C48/04B29C48/40B29C2948/92704B29C2948/92895
Inventor 吴为中
Owner PEKING UNIV
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