活性炭使用多久需要更换？可以再生重复使用吗？
答：活性炭的更换周期取决于应用场景和污染物浓度，无固定时间标准，可通过以下方法判断更换时机：
空气净化：当吸附效率下降（如异味反弹）、出风口风量明显减小，或检测到污染物浓度超标时，需更换。家用活性炭一般 3-6 个月更换，工业用活性炭可根据在线监测数据判断。
水处理：当出水水质指标（如 COD、色度）超过标准，或活性炭床层压力损失过大时，需更换。工业水处理活性炭通常 6-12 个月更换一次。
再生问题：工业用活性炭可通过热再生、化学再生、蒸汽再生等方式重复使用，再生率可达 80%-90%，能有效降低使用成本。但家用活性炭再生难度大，建议直接更换；药用、食品级活性炭为保障安全性，禁止再生复用。
How long should activated carbon be used before replacement? Can it be regenerated and reused?
Answer: The replacement cycle for activated carbon depends on application scenarios and pollutant concentrations, with no fixed standard. Replacement timing can be determined through the following methods: For air purification systems, replacement is required when adsorption efficiency declines (e.g., odor rebound), airflow at the outlet significantly decreases, or pollutant levels exceed standards. Household activated carbon typically requires replacement every 3-6 months, while industrial applications may be adjusted based on real-time monitoring data.
Water treatment: When effluent quality parameters (e.g., COD, color) exceed standards or the pressure loss in the activated carbon bed becomes excessive, replacement is required. Industrial activated carbon for water treatment is typically replaced every 6-12 months.
Regeneration issue: Industrial activated carbon can be reused through thermal, chemical, or steam regeneration, achieving 80%-90% regeneration rate, which effectively reduces usage costs. However, household activated carbon is difficult to regenerate and should be replaced directly. For medicinal and food-grade activated carbon, regeneration is prohibited to ensure safety.
