摘要
以高TS(固体含量)易腐有机废物与剩余污泥为原料,研究了二者混合后的厌氧消化规律。固体含量分别为20%、30%、35%和40%,添加污泥为有机质的厌氧消化提供了足够的微生物量。试验结果表明,在TS为20%、30%温度35℃和TS为35%温度55℃时均未出现酸抑制现象。各组试验在pH值下降到3.8后仍可以回升至中性。在pH值下降过程中,消化液相VFA(挥发性脂肪酸)浓度低、波动较小,在pH值上升过程中VFA浓度迅速增大,中温消化时VFA增加幅度大于高温消化。当TS增加到40%时出现了严重酸化,pH值维持在较低水平。消化液相CODCr经过短时间的上升后浓度较高,在10000.0～20000.0mg·L-1之间。中温消化H2S浓度显著高于高温消化,最大浓度为500mL·L-1,NH3最大浓度为200mL·L-1。原料中纤维素含量对降解率影响较大,原料纤维素含量较低时降解率很小。
Putrescible organic wastes were short of biomass and water while the sewage sludge was just on the contrary. The mixtures were treated by anaerobic digestion. The TS (total solid concentration) were confirmed at 20% , 30% , 35% and 40% respectively and the added sewage sludge enhanced the microbe biomass. The results showed that acidification inhibition were avoided at 20% , 30% TS 35℃ and 35% TS 55℃ . The pH value could return to neutral after dropped to 3.8 in these three tests. In the courses of pH decreasing, VFA (volatile fatty acid) concentration was low with small variation, while the concentration of VFA increased quickly with pH increasing. VFA under 35℃ was higher than that under 55℃ . When the TS increased up to 40% , the digestion process was broke off and pH maintained low values. After increasing for a short time, CODCr maintained at a high level in liquid phase, with the concentration between 10 000.0 mL· L- 1 and 20 000.0 mL· L- 1. H2S in mesophilic digestion was higher than that in thermophilic process. The maximum concentration of H2S and NH3 were 500 mL· L- 1 and 200 mL· L- 1 respectively. The cellulous degradation rates were influenced greatly by cellulous content of raw mixture, and it is small when the cellulose content in raw material was low.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2004年第3期607-610,共4页
Journal of Agro-Environment Science
基金
国家863高技术资助项目(No2001AA64402)
国家自然科学基金(70171055
50179011)
国家杰出青年科学基金(50225926)
高等学校博士学科点专项科研基金(20020532017)
2000年教育部高等学校优秀青年教师教学科研奖励计划资助项目
关键词
易腐有机废物
剩余污泥
厌氧消化
putrescible organic waste
sewage sludge
anaerobic digestion
