本文選題：游離氨　切入點(diǎn)：氨抑制　出處：《環(huán)境科學(xué)》2017年02期

【摘要】：污泥高含固厭氧消化系統(tǒng)中,過(guò)高的游離氨(free ammonia nitrogen,FAN)濃度被認(rèn)為是影響其產(chǎn)氣性能的主要因素之一.通過(guò)降低pH和提高總氨氮(total ammonia nitrogen,TAN)濃度兩種方法,考察了進(jìn)料含固率為15%的中溫半連續(xù)污泥高含固厭氧消化反應(yīng)器在這兩種游離氨調(diào)控措施下的性能表現(xiàn).結(jié)果表明,隨著TAN的提高,FAN從(400±174)mg·L~(-1)提升至(526±25)mg·L~(-1),日產(chǎn)沼氣量從(11.9±0.3)L·d-1降低到(10.3±0.2)L·d-1,揮發(fā)性固體(volatile solid,VS)降解率降低了33.7%;同時(shí),當(dāng)通過(guò)降低pH使得FAN從(330±99)mg·L~(-1)下降至(47±13)mg·L~(-1)時(shí),日沼氣產(chǎn)量也從(14.4±1.1)L·d-1下降到(10.8±0.3)L·d-1,VS降解率降低了26.9%,系統(tǒng)性能并沒(méi)有隨著FAN的下降而提升.隨著pH調(diào)控的停止,游離氨濃度逐步回升至300 mg·L~(-1),系統(tǒng)性能也恢復(fù)至調(diào)控之前的水平,表明pH調(diào)控的過(guò)程產(chǎn)生了游離氨濃度控制之外的抑制性作用.最后,通過(guò)對(duì)細(xì)菌和古菌的多樣性分析以及甲烷菌的定量PCR分析,可以發(fā)現(xiàn)兩個(gè)反應(yīng)器系統(tǒng)產(chǎn)氣性能的變化都伴隨著細(xì)菌種群結(jié)構(gòu)的明顯變化.污泥高含固厭氧消化系統(tǒng)中過(guò)高的FAN(500 mg·L~(-1))使得降解蛋白的細(xì)菌的主要種群由Tepidimicrobium和Proteiniborus轉(zhuǎn)變?yōu)锳naerobranca.而通過(guò)降低pH來(lái)控制游離氨濃度之后,一些糖類(lèi)和蛋白質(zhì)類(lèi)發(fā)酵細(xì)菌的活性也受到影響,并導(dǎo)致這些物質(zhì)水解效率的下降,進(jìn)而由于產(chǎn)甲烷菌的基質(zhì)供給量的不足而削弱系統(tǒng)的產(chǎn)氣性能.
[Abstract]:The high concentration of free ammonia nitrogenin in anaerobic digestive system is considered to be one of the main factors affecting the gas production of sludge. Two methods are adopted to reduce pH and increase the concentration of total ammonia nitrogenTAN. The performance of a medium temperature semi-continuous sludge reactor with a solid content of 15% under these two free ammonia regulation measures was investigated. With the increase of TAN, the degradation rate of VSs decreased from 400 鹵174)mg L ~ (-1) to 526 鹵25)mg L ~ (-1), from 11.9 鹵0.3 L ~ (-1) to 10.3 鹵0.2 L ~ (-1) d ~ (-1), and from 330 鹵99)mg L ~ (-1) to 47 鹵13)mg L ~ (-1). The daily biogas production also decreased from 14.4 鹵1.1 L d -1 to 10.8 鹵0.3 L d -1 vs degradation rate decreased 26.9%, and the system performance did not increase with the decrease of FAN. With the stop of pH control, the concentration of free ammonia gradually increased to 300mg / L, and the system performance returned to the level of pre-regulation. The results showed that the process of pH regulation had inhibitory effect beyond the control of free ammonia concentration. Finally, the diversity of bacteria and ancient bacteria and the quantitative PCR analysis of methane bacteria were analyzed. It can be found that the change of gas production performance of the two reactor systems is accompanied by the obvious change of bacterial population structure. The excessive FAN(500 mg / L ~ (-1) in the anaerobic digestive system with high sludge content makes the main population of protein-degrading bacteria transfer from Tepidimicrobium and Proteiniborus. Become Anaerobranca. And by lowering pH to control the concentration of free ammonia, The activity of some fermentative bacteria of carbohydrate and protein was also affected, which resulted in the decrease of hydrolysis efficiency of these substances, which weakened the gas production performance of the system because of the insufficiency of the substrate supply of methanogenic bacteria.
【作者單位】： 同濟(jì)大學(xué)環(huán)境科學(xué)與工程學(xué)院污染控制與資源化研究國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51308402,51538008) 國(guó)家科技支撐計(jì)劃項(xiàng)目(2014BAC31B01)
【分類(lèi)號(hào)】：X703.1

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