1. Septic tank+constructed wetland
Three-format septic tank+constructed wetland is a treatment process with low investment cost, which is suitable for general villages with uncertain village layout planning and areas with imperfect drainage system and large water environment capacity. Septic tank is a simple rural sewage treatment equipment, which basically has no nitrogen and phosphorus removal effect. Therefore, a small constructed wetland is set behind the septic tank, and the nitrogen and phosphorus compounds in the sewage are absorbed by the plant roots to achieve the effect of purifying the sewage.
Investment cost: 3000-4000 yuan per household.
Process characteristics: low cost, simple operation, suitable for small rural sewage treatment projects with low budget.
Second, the comprehensive purification tank
Purification tank is one of the small rural sewage treatment equipment with high efficiency and energy saving, which is suitable for 1-30 village, and can efficiently purify domestic sewage such as toilet, kitchen sewage, laundry drainage, bath drainage and so on. The investment per household is high, which is suitable for economically developed areas.
Investment cost:1.50,000-20,000 yuan/household, excluding pipe network. The electricity fee per ton of water treatment is about 0.3 yuan/ton, and the operation and maintenance cost is about 3 yuan/ton.
Process characteristics: small floor space, stable effluent and short construction period.
Three. Utilization of ecological resources
Ecological resource utilization technology is suitable for domestic sewage treatment of 1-2 households. It is suitable for villages with relatively weak economic and technological foundation and large local water environment capacity.
Investment cost: the cost of a single household module is 5000-6000 yuan.
Process characteristics: it is convenient for sewage resource utilization, and villagers can maintain it by themselves, with long service life, low cost and short installation period.