Rainwater garden system applicable to greenhouse irrigation

Abstract

The invention relates to a rainwater garden system applicable to greenhouse irrigation. The rainwater garden system comprises a rainwater collection unit which is arranged at the bottom of the roof ofa greenhouse, a rainwater garden unit which is arranged under a drainage port of the rainwater collection unit, a water collection unit which is connected to a drainage port of the rainwater garden unit and an irrigation unit which is connected to the water collection unit and is arranged in the greenhouse, wherein the rainwater garden unit comprises a saturated water region for planting plants,a non-saturated water region which is arranged on the periphery of the saturated water region and communicates with the saturated water region by virtue of a reverse drainage pipeline and a re-backfill region which is arranged at the bottom of the non-saturated water region; the saturated water region is arranged under the drainage port of the rainwater collection unit; and a drainage port in thenon-saturated water region is connected to the water collection unit. The rainwater garden system, in comparison with the prior art, not only can guarantee a good water-holding capacity and a good capacity of reducing rainwater runoff, but also can guarantee a capacity of greatly improving a removal rate on pollutants in rainwater, and especially, a removal rate on total nitrogen and total phosphorus is obviously improved; and a soil matrix can be replaced conveniently, so that the service life of the entire system is prolonged.

Description

technical field [0001] The invention relates to the technical field of rainwater utilization, in particular to a rain garden system suitable for greenhouse irrigation. Background technique [0002] At present, my country's facility agriculture is short of water, especially for greenhouse irrigation; at the same time, greenhouse irrigation has relatively high water quality requirements, and water quality is an important factor affecting the quality of greenhouse crops; The increasing shortage of tap water leads to the increase of the cost of tap water and the pollution of water sources. It is urgent to find a new way of water supply; and rainwater is one of the available and important sources of fresh water. my country has abundant rainfall, and rainwater is organic and inorganic. The pollution content is low, the microbial pollution is low, easy to treat, and the water quality after treatment is reliable and safe; therefore, collecting, storing, treating and utilizing rainwate...

AI Technical Summary

Problems solved by technology

However, when the traditionally designed rainwater garden is used to collect and utilize rainwater on the roof of the greenhouse, because the traditionally designed rainwater garden cannot provide good pollutant removal capacity, the rainwater filtered through it cannot meet the requirements of greenhouse irrigation water, making the rainwater utilization efficiency Greatly reduced

[0006] At the same time, studies have shown that with the increase of the use time of the rain garden, the performance of the rain garden is reduced due to the precipitation and clogging of pollutants such as heavy metal ions in the planting soil layer and the artificial filler matrix. For example, Hsieh (2007) et al. found that , the phosphorus removal rate of many rain gardens decreases with the increase of the age of use, and eventually the cumulative amount of phosphorus in the soil will reach a critical value. At this time, the soil matrix needs to be refilled to replace the aged soil matrix

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