| 摘要 |
<p>A two-stage, batch process for purifying wastewater containing organic and adsorbable pollutants includes the steps of introducing a predetermined quantity of the wastewater into an aeration and settling zone (12) of a primary treatment zone (10) and aerating said wastewater therein in the presence of a powdered adsorbent, such as activated carbon, and biologically active solids, terminating aeration and retaining the thus-treated wastewater in the aeration and settling zone (12) a sufficient time for a substantial portion of the suspended solids to settle by gravity. A predetermined amount of the partially-treated wastewater is withdrawn (26) from the aeration and settling zone (12) and introduced into a contact zone (28) wherein it is agitated, preferably by aeration, in the presence of a powdered adsorbent, agitation is terminated and the solids are allowed to settle by gravity. After completion of settling, clarified, substantially solids-free water is withdrawn (40) from the contact zone (28).</p> |
