| 摘要 |
<p>In a new bioreactor for rotting down organic substances to produce methane gas, (a) before introducing into the bioreactor the biomass is prefermented with the enzymes amylase, lipase and the proteases trypsin, chymotrypsin, elastase and carboxypeptidase to break down cyclic hydrocarbon molecules to short, readily-degradable open-chain molecules; (b) methane bacteria of the desired mesophilic type are cultivated separately on nutrient solution in a separate process to avoid degenerative effects arising from inoculation of fresh sludge with old sludge; (c) the biomass is hygienized by basifying to pH 12 with CaO and exothermic heating at 70 deg.C for 30 mins; (d) the biomass is rotted separately for the entire duration of composting in 12 individual chambers so that the development of methane bacteria is not inhibited by continuous charging; (e) the biomass is cycled through the serially arranged rotting chambers using biogas at the operating temp. of 38 deg., the chambers being fitted at 1-day or 2-day intervals; (f) all the chambers are arranged in series, linked by a closed pipe system, but the pH of each chamber is individually automatically regulated to pH7 by addn. of lime water; and (g) the biomass reactor is fitted with a double mantle and biomass temp. is held constant throughout the process using a thermostatted heating system. The measures outlined above ensure that development of methane-generating bacteria is undisturbed. Gas yields are high, CO2 content is low, and reaction time for 80% gas yield is reduced to 6 days.</p> |
