Low-influence development and landscape growth medium, and preparation method and application thereof

Abstract

The invention relates to a low-influence development and landscape growth medium, and a preparation method and application thereof. The growth medium is prepared from the following raw materials in parts by weight: 55 to 65 percent of coarse sand, 10 to 20 percent of coco coir, 20 to 30 percent of dewatered sludge and 5 to 15 percent of monazite sand, wherein the dewatered sludge is subjected to biodeodorization and oxygenation stabilization in advance; the water content is not higher than 50 percent; the content of lanthanide in the monazite sand is not lower than 25 percent. The sludge difficult to be treated in an urban sewage plant is used for making the growth medium required by low-influence development, so that the difficult-to-treat sludge generated by an urban sewage treatment plant can be changed from waste materials into valuable materials. The growth medium provided by the invention has the water preservation and fertilizer preservation effects, so that nutrients cannot be released along rainwater runoff; a sufficient seepage rate can be achieved; the growth conditions of various landscape plants can be met.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a low-impact development and utilization growth medium and its preparation method and application. The growth medium is especially suitable for manufacturing green roofs, rain gardens, ecological drainage systems, and landscape planting. Background technique [0002] Low Impact Development (LID) is a stormwater management technology pioneered by Seattle, Portland, and Prince George County, Maryland in the late 1990s. Its principle is through small, decentralized engineering means , use the water retention, infiltration and transpiration of compound soil and specific plants to reduce the peak value and flow of storm runoff, control the storm runoff and non-point source pollution caused by runoff from the source, so that the development area is as close as possible to the natural hydrology before development cycle state. This is an ecosystem-based approach to stormwater ma...

AI Technical Summary

Problems solved by technology

However, many years of monitoring at the LID facility in Washington State, USA have shown that the compound soil mixed with humus can only reduce the suspended solids in the runoff, but increase the release of phosphorus and nitrogen and become a secondary pollution source; the second is based on peat Growth medium of raw materials: Because the nutrients in the humus soil are released to the receiving water body with the rainwater runoff, some foreign areas replace the humus soil with peat. Although peat can maintain a certain amount of nutrients for plants to absorb, it basically does not drain out. Phosphorus and nitrogen, but peat is a non-renewable natural resource, and peat mining is prohibited in many areas, so the use of peat is obviously an unsustainable medium; the third is the growth medium with sand as the basic raw material: due to the nutrients in humus The pollutants will be released with the rainwater runoff, polluting groundwater and rivers and lakes, so some areas use sand as the basic raw material for growth media, for example, the New England region of the United States uses 80% coarse sand and 20% planting soil, which is The mixture of species greatly limits the selection of plants, which has some impact on the landscape effect; the fourth is to use the planting soil as the basic raw material for the growth medium: since the LID technology has not been introduced into the country soon, it has not yet formed a standard, so in the construction of rain gardens, biological grass ditch, etc. In LID bioretention facilities, the landscape effect is often overemphasized. For the survival of landscape plants, fertilizers are added to the bioretention planting soil. These fertilizers seep into groundwater with runoff or discharge into rivers and lakes through dead pipes, which aggravates groundwater pollution and Eutrophication of rivers and lakes

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