| 摘要 |
<p>Cleaning a ceramic ultrafiltration membrane comprises preparing a composition A comprising 5-20 wt.% sodium hydroxide, 5-10 wt.% sodium alkylbenzene sulfonate and 5-10 wt.% sodium carbonate in water, preparing a composition B comprising 1-5 wt.% nitric acid, 0.5-3 wt.% hydrogen peroxide and 0.5-2.5 wt.% sodium hypochlorite in water, heating composition A to 40-70[deg] C, circulating composition A on the membrane until breakthrough occurs, discharging composition A, heating composition B to 40-70[deg] C, circulating composition B on the membrane for 2-4 hours, leaving the membrane immersed in composition B for 2 days, discharging composition B, and repeating the treatment with composition A. Independent claims are also included for: (1) composition for cleaning ceramic ultrafiltration membranes, comprising a composition A as above; (2) composition for cleaning ceramic ultrafiltration membranes, comprising a composition B as above.</p> |
