矿物材料对餐厨垃圾厌氧消化的影响研究

Effect of minerals on anaerobic digestion of food waste

在试验的基础上研究了3种矿物材料膨润土、斜发沸石、粉煤灰对富含钠离子的餐厨垃圾厌氧消化过程的影响.结果表明,在发酵温度为35℃、底物固含量(TS)为10%、添加物用量为1%(质量分数,以消化底物计)时,膨润土、沸石粉、粉煤灰对含盐餐厨垃圾的厌氧发酵消化液中的钠离子具有良好的吸附性能,吸附率分别为13.75%、10.11%、7.99%.在未使用无机矿物的情况下,当钠离子浓度为3000～4000mg·L-1时,含盐餐厨垃圾的的厌氧消化过程受到Na+离子的明显抑制.从产气量分析,3种矿物材料均能明显促进餐厨垃圾的厌氧消化过程,与空白对照试组相比,膨润土、斜发沸石、粉煤灰分别使产气量提高了131%、82%和45%.三者对甲烷气产量的促进影响强弱顺序是,膨润土>斜发沸石>粉煤灰.初步讨论了这3种矿物材料提高餐厨垃圾厌氧消化甲烷产量的作用机理.

The effects of three different kinds of inorganic minerals additives （bentonite, clinoptilolite, coal ash fly） on anaerobic digestion of sodiumriched food waste were explored. The results showed that kept at mesophilic temperature （35℃） , 10% total solid content, and 1% additives（w/w substrate）, the three minerals had good adsorption characters to sodium ion in sodium-riched food waste digestion substrate, and the adsorption efficiency to the sodium were 13.75% , 10.11% and 7.99% , respectively, which namely the bentonite＇s adsorption to sodium was the highest. The sodium-riched food waste digestion was drastically inhibited by sodium ion at the level of 3000 - 4000mg· L^ - 1 with no minerals additives. As for the gas production, each sort of the three inorganic minerals significantly enhanced the anaerobic digestion of sodium-tithed food waste. Compared with the blank control, the total gas production enhanced 131% , 82% and 45% respectively, and the sequence of improvement efficiency is ： bentonite 〉 clinoptilolite 〉 coal ash fly. The mechanism about the facilitating the anaerobic digestion with the addition of inorganic minerals was also briefly discussed.