| 摘要 |
<p>Treating domestic wastes comprises: (i) sieving off a fine fraction, and comminuting the residue to a particle size up to 180 mm, supplied e.g. for incineration; (ii) removing ferrous objects from the fine and residual fractions by magnetic separation; (iii) washing out and removing inert materials from the fine fraction; (iv) subjecting the phase freed of inerts to anaerobic treatment (3, 11), in which by hydrolysis and acid fermentation (3) metals, especially those heavy metals forming organic complexes, are dissolved out, being converted into a largely-ionised, water-soluble form; (v) separating the aqueous phase (4) containing the dissolved heavy metals from residual sludge, and precipitating the heavy metals (6); and (vi) supplying the residual sludge to a stage of methanisation (11) from which the remaining sludge (13) is composted.</p> |
