活性污泥及其与秸秆共基质的厌氧消化特性

为分析秸秆对污泥厌氧消化特性的影响，在中温[（35±1）℃]条件下，研究了活性污泥单基质及其与秸秆共基质在SRT（固体停留时间）分别为10和15 d，以及C/N（质量比）分别为5.5:1、10.0:1的情况下，厌氧消化产沼气量及其组分、ρ（NH₄+-N）、ρ（TP）、ρ（COD_Cr）及ρ（VFA）[以ρ（乙酸）计，其中VFA为挥发性短链脂肪酸]的变化特性.结果表明:活性污泥-秸秆共基质厌氧消化在SRT为10、15 d时，累积沼气产量为5 818.0、9 026.0 mL，比活性污泥单基质的沼气产量（4 930.0、7 760.0 mL）分别提高了15.3%、14.0%；共基质所产沼气中φ（CH₄）最高为69.3%，比活性污泥单基质高出15.4%.此外，在SRT为10和15 d时，活性污泥-秸秆共基质厌氧消化COD_Cr去除率分别为25.0%和28.0%，优于单基质的10.2%和13.1%；共基质平均ρ（NH₄+-N）分别为278.5和254.9 mg/L，单基质平均ρ（NH₄+-N）分别为215.6和213.5 mg/L；活性污泥-秸秆共基质平均ρ（TP）分别为168.6和175.9 mg/L，高于活性污泥单基质的129.2和152.2 mg/L.共基质有利于厌氧消化液中有机物的提高，从而增加ρ（VFA）、提高甲烷产量.研究显示，共基质可优化厌氧消化底物的C/N，促进厌氧消化反应，提高产气量. 

Characteristics of Anaerobic Digestion of Activated Sludge and Co-Substrates with Waste Straw

In order to investigate the characteristics of anaerobic digestion of activated sludge and co-substrates with waste straw, anaerobic digestion with activated sludge and co-substrates with waste straw was conducted under mesophilic condition (35±1)℃ with solid retention time (SRT) of 10 and 15 d. The variation characteristics of biogas production and composition, ρ(NH₄+-N), ρ(TP), ρ(COD_Cr) and ρ(VFA) were investigated with the C/N (mass ratio) of mono-substrate of sewage sludge and co-substrates set at 5.5:1 and 10:1, respectively. When SRT were 10 and 15 d, the cumulative biogas productions from co-substrates were 5818.0 and 9026.0 mL, respectively, 15.3% and 14.0% higher than those of the mono-substrate (i.e. 4930.0 and 7760.0 mL), respectively. The maximal φ(CH₄) from co-substrates was 69.3%, 15.4% higher than that of single substrate (maximum 58.61%). The removal rates of COD_Cr were 25.0% and 28.0% of co-substrates during two SRT, better than those of mono-substrate (which only had 10.2% and 13.1%). The average ρ(NH₄+-N) and ρ(TP) of co-substrates were 278.5, 254.9 mg/L and 168.6, 175.9 mg/L, which were higher than 215.6, 213.5 mg/L and 129.2, 152.2 mg/L of mono-substrate. Co-substrates can optimize C/N of substrates and promote the performance of anaerobic digestion and biogas production.