There are several basic factors to consider when building a sustainable home: food, water and energy. (1) Food. First of all, I think it is feasible to use hydroponic technology and soil cultivation to establish a greenhouse ecological planting system. Vegetable greenhouses are the main facilities for planting off-season vegetables, and the requirements for greenhouse vegetable cultivation are relatively high. This is an efficient agricultural crop planting technology that is environmentally friendly and can generate economic benefits. The high technical cost is one of the shortcomings of this technology. A well-designed system may cost thousands of dollars, but only the herbs or vegetables needed by four or five people do not need to be too expensive. The best choice can be varieties with low temperature tolerance, low light requirements, strong resistance, high humidity tolerance, high yield, and short planting time, such as cucumbers, tomatoes, and green peppers. Second, establish a small comprehensive farm that can grow fruit trees and breed chickens and ducks at the same time. Chickens and ducks can kill insects and weeds for fruit trees, and their dung can be used as fertilizer for the biogas system. (2) Water source. In this case, I recommend digging wells to collect water and rainwater. Of course, we need a set of household water purifiers to purify the collected water. The household water purifier adopts multi-stage filter elements for water purification treatment, and filters the collected water without adding any compounds to produce pure water that can be directly consumed by humans. It can remove harmful substances such as bacteria, viruses, heavy metals, and organic phosphorus in the water. (3) Renewable energy. First of all, solar energy is the easiest source of energy. Household photovoltaics mainly use the idle resources on the existing buildings of the family, such as roofs, wall facades, balconies, courtyards, etc., to install and use distributed photovoltaic power generation systems. It is recommended to first consider the installation location and installation area of photovoltaic modules. Generally speaking, south roofs or east-west facing roofs are more suitable for installation. In addition, you can also consider installing sun sheds, carports or sunshades. In addition, solar water heaters are essential products. Second, we need to consider the situation where the electricity demand is relatively large. According to Yahi Menezes' suggestion on "Organic waste handling", I also suggest to establish a biogas system to obtain electricity. The residue after biogas production can be used as organic fertilizer.
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