Department of Environmental Technologies, University of Cadiz, Campus de Puerto Real, 11500, Puerto Real, Cadiz, Spain.
Chemosphere. 2020 Nov;259:127474. doi: 10.1016/j.chemosphere.2020.127474. Epub 2020 Jun 23.
Anaerobic digestion (AD) is the biological preferred treatment applied to Slaughterhouse wastewaters (SWW) due to its effectiveness. The aim of the study is to investigate the effect of different percentages of fats, oil and grease (FOG) on biomethane production in anaerobic co-digestion with slaughterhouse wastewater using BMP tests under mesophilic conditions (35 °C). For this purpose, three percentages of FOG from 1% to 10% were tested. Biodegradability, biomethane production and the microbial population were studied. In addition, settling capacity has been evaluated at different conditions: i) before and after anaerobic co-digestion; ii) at different temperature 25 °C and 35 °C. The settling rates as well as the characterization of the digestate were recorded. Experimental results showed that all the co-digestion mixtures (FOG percentages = 1-10%) enhanced biomethane production and biodegradability compared to AD of sole SWW. The best conditions were achieved at 5-10% of FOG, showing biodegradability of 66-70% CODt and specific biomethane productions of 562 and 777 mL·g, respectively. Regarding microbial dynamics, Eubacteria was reduced with the increase in %FOG but Acetate utilizing methanogens was increased. Regarding settling capacity, mesophilic temperatures (35 °C) increased the settling rate of digestate in 1.76 times and reduced the lag-phase to 0.92 min; obtaining a more concentrated sludge and leaving a clarified whose TSS represent only 8% of TS.
厌氧消化（AD）是一种生物首选的处理方法，适用于屠宰废水（SWW），因为它具有有效性。本研究的目的是在中温条件（35°C）下使用 BMP 测试，研究不同脂肪、油和油脂（FOG）百分比对与屠宰废水进行厌氧共消化时生物甲烷生产的影响。为此，测试了从 1%到 10%的三个 FOG 百分比。研究了生物降解性、生物甲烷产量和微生物种群。此外，还在不同条件下评估了沉降能力：i）在厌氧共消化前后；ii）在不同温度 25°C 和 35°C 下。记录了沉降速率以及消化物的特性。实验结果表明，与单独的 SWW 的 AD 相比，所有共消化混合物（FOG 百分比=1-10%）都提高了生物甲烷产量和生物降解性。在 5-10%FOG 的最佳条件下，显示出 66-70%CODt 的生物降解性和分别为 562 和 777 mL·g 的特定生物甲烷产量。关于微生物动态，随着 FOG 百分比的增加，Eubacteria 减少，但利用乙酸的产甲烷菌增加。关于沉降能力，中温（35°C）将消化物的沉降速率增加了 1.76 倍，并将滞后时间减少到 0.92 分钟；获得了更浓缩的污泥，并留下了澄清液，其 TSS 仅占 TS 的 8%。
