| 摘要 |
<p>A process has steps of aerobic treatment to remove COD and nitrify a was te stream and anoxic treatment to denitrify a waste stream followed by anoxic treatment to remove selenium and anaerobic treatment to remove heavy metals and sulphur may be used to treat, for example, FGD blow down water. The process may further include one or more of (a) membrane separation of the waste stream upstream of the anoxic digestion to remove selenium, (b) dilution upstream of the biological treatment step, (c) physical/chemical pretreatment upstream of the biological processes or dilution step to remove TSS and soften the waste stream, or (d) ammonia stripping upstream of t he biological treatment steps or dilutions step. These processes may be provide d in a variety of suspended growth or fixed film reactors, for example a membrane bioreactor or a fixed film reactor having a GAC bed.</p> |
