| 摘要 |
<p>Bio-oxidation and nitrification modules (12) for treating sewage and industrial wastewater are formed of alternating flat sheets (15) perforated with holes (20) which may be up to 0.8 cm. in width and 1.2 cm. in length and that produce a percentage void area in the sheet of up to 50 percent and corrugated sheets (14). <IMAGE></p> |
