A compound sand-fixing agent containing urban sludge and a method for constructing biological crusts

Abstract

The invention provides a composite sand fixing agent containing urban sludge. The composite sand fixing agent is prepared from the following ingredients in parts by mass: 50 to 500 parts of urban sludge dry powder and 1 to 2 parts of polyacid compounds, wherein the polyacid compounds are selected from one or several kinds of materials in polylactic acid, polyglutamic acid and polylysine. The composite sand fixing agent comprising urban sludge provided by the invention belongs to the technical field of environmental-friendly biology. The sufficient utilization of the urban sewage can be realized; the additional addition of algae strains is not needed; scaled calculation is realized; simplicity, easy implementation, low popularization cost and high biological crust efficiency are realized; the formed biological crust cannot easily break; the water seepage and water preservation are easy.

Description

technical field [0001] The invention belongs to the field of environmental protection biological technology, and particularly relates to a composite sand-fixing agent containing urban sludge and a method for constructing biological crusts. Background technique [0002] my country is one of the countries most seriously affected by desertification in the world. The mines and pastures are severely affected by wind erosion and sandification, and winds blowing sand and sandstorms frequently occur. How to reduce casualties and property losses caused by sandstorm activities, to prevent the expansion of desertification, to transform desertified land, and to improve the ecological environment is a major task of contemporary human society. [0003] Biocrust mainly refers to a composite biological soil layer formed by different types of mosses, lichens, algae, fungi, cyanobacteria, and bacteria, etc. and the thin sand and / or soil below. The underground hyphae and pseudo-roots of bact...

AI Technical Summary

Problems solved by technology

Purified species have high environmental requirements in the production process, requiring aseptic operation and avoiding pollution. Therefore, the production equipment and operating costs are relatively high, which is not conducive to technology promotion

Chinese patent application CN102613065 A discloses a method for constructing artificial algal crusts by using mixed algae species. The algae species are not separated and purified, and are directly used for inoculation and construction of algal crusts after large-scale cultivation; although the mixed species avoids the separation and purification process , but like purified species, large-scale cultivation is required, and the investment in related media and equipment increases the cost of artificial biological crusts, which restricts the use of technology

Chinese patent application CN102757792 A discloses a composite ecological sand-fixing agent made of biological sludge, which consists of organic polymers (more than one of polyacrylic acid, polyacrylate and starch), sodium salts (sodium silicate, sodium aluminate and more than one of sodium carboxymethyl cellulose), domestic sludge and drought-resistant algae (cyanobacteria or green algae), spread on the desert sand surface, after 20 days, an algae crust can form, but the composition is more complex , the cultivation cost of drought-resistant algae (cyanobacteria or green algae) is also higher

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