CAJ | 학술논문

热水解预处理强化了污泥厌氧消化过程,但同时增加了微生物受游离氨抑制的风险.对比传统工艺,在有机容积负荷率1.74~4.27gVS/(L·d)条件下,研究了游离氨(FA)对热水解联合中温厌氧消化工艺性能的影响.结果表明,组合工艺甲烷产量较传统反应器提高89%~121%,有机去除率提高1.21~1.46倍.但同时导致系统中游离氨浓度达89~382mgN/L,显著高于传统工艺中37~84mgN/L的范围.游离氨毒性测试显示,传统工艺中FA浓度从43mgN/L升至84mgN/L,没有抑制解乙酸产甲烷途径,而组合工艺中FA升至264mgN/L时,表现出抑制作用,尽管厌氧菌对高浓度FA表现更强的驯化趋势.结合氮负荷试验, FA浓度与基质利用能力,解乙酸产甲烷途径抑制程度和挥发性有机酸积累的关系表明,高有机负荷条件下组合工艺效率可通过控制氮负荷优化.
열수해예처리강화료오니염양소화과정,단동시증가료미생물수유리안억제적풍험.대비전통공예,재유궤용적부하솔1.74~4.27gVS/(L·d)조건하,연구료유리안(FA)대열수해연합중온염양소화공예성능적영향.결과표명,조합공예갑완산량교전통반응기제고89%~121%,유궤거제솔제고1.21~1.46배.단동시도치계통중유리안농도체89~382mgN/L,현저고우전통공예중37~84mgN/L적범위.유리안독성측시현시,전통공예중FA농도종43mgN/L승지84mgN/L,몰유억제해을산산갑완도경,이조합공예중FA승지264mgN/L시,표현출억제작용,진관염양균대고농도FA표현경강적순화추세.결합담부하시험, FA농도여기질이용능력,해을산산갑완도경억제정도화휘발성유궤산적루적관계표명,고유궤부하조건하조합공예효솔가통과공제담부하우화.
Thermal hydrolysis facilitates anaerobic digestion process, but raises the possibility of free ammonia inhibition. This study evaluated the effect of free ammonia on the methanogenic ability of the thermal hydrolysis and mesophilic combined process treating waste activated sludge (WAS) with conventional single phase process as comparision. At the volumetric organic loading rates of 1.74~4.27gVS/(L·d), the combined process had 89%~121% methane production and 1.21~1.46 times volatile solids reduced than the conventional process. But it produced free ammonia (FA) ranging 89~382mgN/L, much higher than that (37~84mgN/L) in the conventional process. Anaerobic microorganisms in both processes acclimated to high FA concentrations. The aceticlastic methanogenesis pathway was barely affected in the conventional process with FA increasing from 43 to 84mgN/L, while the activity of aceticlastic methanogens was inhibited in the combined process with FA concentration higher than 264mgN/L. The interaction of FA concentration, BMP utilization ratio, the inhibition of aceticlastic methanogenesis and volatile fatty acid (VFA) accumulations indicated the combined process was mainly affected by nitrogen loading, which was different from organic loading limited conventional process. At high solid concentration, nitrogen loading rates should be considered as an limiting operational parameter for thermal hydrolysis anaerobic digestion process.