| 摘要 |
<p>PURPOSE:To enable to sufficiently exhibit the effect of a dual-phase anaerobic digestion process to be performed in succession, by adjusting a pH of waste water with an alkali agent and then removing the concentration of ammonia nitrogen in the waste water by air or the like. CONSTITUTION:In the dual-phase anaerobic digestion process for separating ammonia nitrogen-contg. waste water such as night soil or the excrementitious matter of cattle into acid and methane-forming phases and then reacting them, said waste water is adjusted to a pH above 11 with an alkali agent, stripped with air or steam until the concentration of ammonia nitrogen in the waste water comes below 2,000mg/l and then treated by said dual-phase anaerobic digestion process. Hence, the effect of the dual-phase anaerobic digestion is sufficiently exhibited, so that the capacity of a fermentation tank can be made small and that the amount of formed digestive gas is made large. Thus, the extention of said process to all kinds of organic waste water disposal is promoted, and the waste matter can be further effectively used as resources.</p> |
