Ⅰ. Background: Water quality crisis forces technological innovation
Wenquan Village, Censong Town, Jianhe County, Guizhou Province is famous for its natural hot springs. The underground hot water is rich in minerals and has long attracted tourists to experience health tourism. However, with the surge in the number of tourists, the discharge of domestic sewage has increased, and the original sewage treatment capacity in the village is insufficient, resulting in the pollution of hot spring water sources, the decline of water quality in some springs, and the ecological environment facing challenges. How to balance resource development and environmental protection has become the core issue of the sustainable development of hot spring villages.
Ⅱ. Technical breakthrough: Construction of a full-chain water treatment system
1. "Recycling" of domestic sewage
Process upgrade: Use integrated sewage treatment equipment, integrate biodegradation, precipitation, and disinfection modules to purify domestic sewage to the national Class A emission standard.
Resource path: The treated reclaimed water is used for farmland irrigation (providing nutrients) and landscape water replenishment (improving village appearance), saving more than 30,000 tons of freshwater resources annually and achieving "zero direct discharge of sewage".
2. Purification and safety of hot spring water
Deployment of a three-level treatment system:
Mechanical filtration: intercepting sediment and suspended solids, protecting pipeline equipment,
Ion exchange: softening water quality, reducing scale corrosion to hot spring facilities,
Ozone + ultraviolet disinfection: double sterilization to avoid chemical residues, ensuring water quality hygiene and safety.
Dynamic monitoring: deploy online water quality sensors to monitor key indicators such as pH value and mineral content in real time, and synchronize data to the management platform.
3. Cascade development of geothermal resources
Build a water resource recycling system and utilize temperature in layers:
High temperature section (80°C+): drive heat pumps to generate electricity, and the annual power generation can meet 30% of the electricity consumption of public facilities in the village.
Medium temperature section (50-80°C): directly supply hot spring pools to reduce heating energy consumption,
Low temperature section (30-50°C): preheat the circulating water system to reduce energy loss.
Tail water (below 25°C): after waste heat recovery, part of it is recharged into the underground reservoir to maintain the sustainability of geothermal resources.
Intelligent temperature control system: through insulated pipes and automatic regulating valves, heat loss is reduced, and the overall energy efficiency is improved by 45%.
Ⅲ. Results: Coordinated growth of ecology and economy
Water quality improvement: 100% domestic sewage treatment rate, 80% reduction in hot spring water turbidity, over 95% mineral retention rate, and 82% increase in tourist repeat visit rate.
Cost optimization: hot spring heating cost is reduced from 28 yuan/ton to 12 yuan/ton, annual energy expenditure is saved by over 600,000 yuan, and comprehensive tourism income is increased by 35%.
Environmental improvement: the problem of sewage flow in villages is completely solved, the greening coverage rate is increased by 25%, and the ecological tourism destination is certified.
Management upgrade: The Internet of Things platform realizes remote monitoring of equipment, the fault response time is shortened to within 2 hours, the operation and maintenance labor cost is reduced by 65%, the operation and maintenance manpower is reduced by 70%, and the fault response efficiency is increased by 90%.