The economic way to purify rainwater is that forests can conserve water and soil, and the functional levels of water conservation are mainly canopy and undergrowth vegetation (shrubs and herbs), litter and root soil. Through these three levels, precipitation can be adjusted and soil erosion resistance and erosion resistance can be improved.
The traditional mode of purifying sky rainwater in arid areas is to collect rainwater and store it in a water kiln, and then naturally precipitate (clarify) and reuse it. This ancient and effective way has been used by people for thousands of years in the arid plateau and desert areas of northwest China.
It is simple and economical to choose a place with good rainwater flow path and build a water kiln by excavation, which can be used for a long time. When using water, kiln water can be salvaged in wooden barrels. The rainwater stored in the kiln is relatively clean, with less excessive content in the water, which is convenient for people and animals to use. However, there is also the problem of water quality deterioration, and how much you drink for a long time is harmful to human health.
Rainwater collection and purification system:
(1) filtration method and precipitation method
Filtering precipitation can remove impurities such as solid suspended solids that are easy to precipitate in rainwater, because rainwater will be polluted by the collection surface during the collection process, especially in summer, there will be larger suspended particles and colloids. After filtration or precipitation, larger particles in rainwater will be separated to achieve the purpose of pretreatment.