| 摘要 |
<p>A method for treating an aqueous liquid effluent containing organic and inorganic materials, particularly manure, said effluent having a dry matter content of at most 12 wt.%, in order to produce a purified aqueous liquid phase and a solid organic ameliorant and/or organic fertiliser, is disclosed. The method comprises subjecting the effluent to one or more primary liquid/solid separation steps and optionally one or more physico-chemical treatment steps to produce both a liquid medium containing no more than 3 wt.% of dry matter and having a turbidity of at most 300 NTU, and a group of concentrates containing at least 15 wt.% of dry matter in all; subjecting the resulting liquid medium to an ultra- or microfiltration step to produce an ultra- or microfiltrate containing no more than 1 wt.% of dry matter and having a turbidity of at most 100 NTU; subjecting the ultra- or microfiltrate to a reverse osmosis step to produce a concentrate and a permeate, which permeate forms the purified aqueous phase; optionally adding a particulate organic complement to the group of concentrates and mixing it therewith to produce a mixture containing 20-40 wt.% of dry matter; and carrying out aerobic fermentation of said mixture to produce an organic ameliorant and/or an organic fertiliser having a dry matter content of 40-60 wt.%.</p> |
