University of Southampton, School of Civil Engineering and the Environment, University Road, Southampton, SO17 1BJ, UK.
Bioresour Technol. 2012 Nov;123:263-71. doi: 10.1016/j.biortech.2012.06.060. Epub 2012 Jun 30.
The effect of hydraulic flush and pH control on hydrolysis, Volatile Fatty Acids (VFA) production and profile in anaerobic leach bed reactors was investigated for the first time. Six reactors were operated under different regimes for two consecutive batches of 28days each. Buffering at pH ∼6.5 improved hydrolysis (Volatile Solid (VS) degradation) and VFA production by ∼50%. Butyric and acetic acid were dominant when reactors were buffered, while only butyric acid was produced at low pH. Hydraulic flush enhanced VS degradation and VFA production by ∼15% and ∼32%, respectively. Most Probable Number (MPN) of cellulolytic microorganisms indicated a wash out when hydraulic flush was applied, but pH control helped to counteract this. The highest VS degradation (∼89%), VFA yield (0.84kgCODkg(-1)VS(added)) and theoretical methane potential (0.37m(3)CH(4)kg(-1)VS(added)) were obtained when pH control and hydraulic flush were applied, and therefore, these conditions are recommended.
首次研究了水力冲洗和 pH 值控制对厌氧渗滤床反应器水解、挥发性脂肪酸 (VFA) 生成和组成的影响。在两个连续批次（各 28 天）的运行中，六个反应器在不同条件下进行操作。在 pH 值约为 6.5 时进行缓冲可将水解（挥发性固体 (VS) 降解）和 VFA 生成率提高约 50%。但当反应器进行缓冲时，丁酸和乙酸占主导地位，而在低 pH 值时仅生成丁酸。水力冲洗可分别将 VS 降解和 VFA 生成率提高约 15%和 32%。当应用水力冲洗时，最大可能数 (MPN) 纤维素分解微生物表明被冲洗掉，但 pH 值控制有助于对此进行抵消。当应用 pH 值控制和水力冲洗时，可获得最高的 VS 降解率（约 89%）、VFA 产率（0.84kgCODkg(-1)VS(added)）和理论甲烷潜能（0.37m(3)CH(4)kg(-1)VS(added)），因此推荐使用这些条件。
