Straw puffed biological matrix material with sandwich type framework, and preparation method and application thereof

Abstract

The invention discloses a straw puffed biological matrix material with a sandwich type framework, and a preparation method and an application thereof. The straw puffed biological matrix material comprises matrix cushion layers and a matrix filler, wherein the matrix cushion layers comprise an upper matrix cushion layer, a middle matrix cushion layer and a lower matrix cushion layer; the matrix filler is filled between adjacent matrix cushion layers to form a pre-finished product with a sandwich structure; the matrix cushion layers and the matrix filler are prepared by compounding of rice strawand an adhesive; and the outer layer of the pre-finished product with the sandwich structure is subjected to enveloping treatment by using the matrix cushion layers to be integrally formed. Accordingto the invention, the sandwich type framework prepared from the straw puffed matrix material increases the porosity and specific surface area of a puffed biological matrix, has good adsorbability topollutants like COD, nitrogen and phosphorus in sewage, increases the stability and mechanical strength of a puffed biological matrix, solves problems like expansion and dispersed suspension of the puffed biological matrix in water, and is easy to be recovered. The straw puffed biological matrix material provided by the invention has the following advantages: the preparation method is simple; energy consumption is low; raw materials are simple and easily-available; a material obtained after sewage treatment can be utilized for the second time; and good application prospects are achieved.

Description

technical field

[0001] The invention relates to the technical field of sewage treatment, in particular to a sandwich frame straw puffed biological matrix material and its preparation method and application. Background technique

[0002] The scale of rice production and animal husbandry in China ranks among the top in the world. Rice planting provides guarantee for China's food security, but also brings about the problem of straw disposal. Traditionally, rice straws are processed mainly through papermaking, biomass power generation, and straw foam boards. These processing routes rely on large-scale industrial production. However, China's unique agricultural model where one household is the main body restricts the intensive operation of rice planting and increases the cost and application scale of the above-mentioned rice straw treatment. Rice straws are returned to the field on the spot, which is conducive to maintaining the fertility of the farmland soil. However, due to...

Images