中水回用是通過物理、化學及生物處理技術，將生活污水、工業廢水等處理至特定水質標準，轉化為可回用的非飲用水資源，實現水資源的閉環管理。中水回用可以替代傳統水源用于非飲用場景（如工業冷卻、園林灌溉、道路沖洗、消防用水等），減少對地下水和地表水的過度開采。還可以降低污水直接排放對自然水體的污染負荷，緩解水體富營養化、重金屬累積等環境問題。

中水回用是實現水資源可持續利用的核心技術路徑，兼具環境修復、經濟增值與社會發展三重價值，是踐行“雙碳”戰略和生態文明建設的重要實踐載體。

1. 環境效益

• 減少污水排放量，保護流域生態健康；
• 緩解水資源短缺地區的水危機。

2. 經濟效益

• 降低企業新鮮水取用成本；；
• 減少污水處理費及排污稅費支出。

3. 社會效益

• 提升城市水資源韌性，提升公共用水安全；
• 推動循環經濟模式落地，增強公眾節水意識。

Water reclamation and reuse involves treating domestic wastewater and industrial effluents through physical, chemical, and biological technologies to meet specific water quality standards, converting them into non-potable reusable resources for closed-loop water management. This practice substitutes conventional water sources in non-drinking applications (e.g., industrial cooling, landscape irrigation, road cleaning, and firefighting), thereby reducing overexploitation of groundwater and surface water. It also mitigates pollution loads from direct wastewater discharge into natural water bodies, addressing environmental challenges such as eutrophication and heavy metal accumulation.

As a core technological pathway for sustainable water resource utilization, water reuse delivers triple value: environmental restoration, economic enhancement, and social development. It serves as a critical implementation vehicle for China's "Dual Carbon Strategy" (Carbon Peak and Carbon Neutrality) and ecological civilization development.

1. Environmental Benefits
? Reduces wastewater discharge volume to protect watershed ecosystem health
? Alleviates water crises in water-scarce regions

2. Economic Benefits
? Lowers corporate costs for freshwater procurement (potential reduction: 30-60%)
? Decreases expenditures on wastewater treatment fees and pollution discharge taxes

3. Social Benefits
? Enhances urban water resource resilience and public water security
? Advances circular economy practices and strengthens public awareness of water conservation