This study investigated the potential benefit of co-digesting sewage sludge (SS) and settled/mixed fat, oil, and grease (FOG) with BioAmp pretreatment, a bio-additive product, for a utility. BioAmp was found to increase the soluble chemical oxygen demand (SCOD)/COD ratio of FOG (from 4.19 to 4.49), consequently enhancing volatile solid (VS) reduction (from 75.9 to 84.8%). The ratio of SS and FOG for co-digestion was based on their actual daily production volume, resulting in FOG content ranging between 15 and 20% VS for co-digestion assays. Co-digestion of SS and mixed FOG waste after BioAmp pretreatment produced the highest cumulative methane yield (CMY) of 400 mL/g VS_added, which is 98% higher than that of mono-digestion of SS (202 mL/g VS_added). Kinetic analysis demonstrated a synergistic effect in co-digestion of FOG and SS with both increased CMY and degradation rate constant. For the utility, co-digestion can increase methane yield by 141%; however, 7.77% more biosolids are produced and 6% more total nitrogen will return to mainstream, a potential burden to nutrient management. Overall, the results of batch test demonstrated the benefits of co-digestion of SS and FOG with BioAmp pretreatment in terms of increased CMY, degradation rate constant, and VS reduction. The analysis of the utility showed that co-digestion can produce more biogas but also increase more biosolids and total nitrogen return.

这项研究调查了使用生物添加剂产品BioAmp预处理共同消化污水污泥（SS）和沉降/混合的脂肪，油脂和油脂（FOG）的潜在效益。发现BioAmp可提高FOG的可溶性化学需氧量（SCOD）/ COD比（从4.19到4.49），从而提高挥发性固体（VS）的减少量（从75.9到84.8％）。SS和FOG共同消化的比例基于其实际日产量，因此共同消化测定的FOG含量在VS的15％至20％之间。助消化SS和BioAmp预处理后混合FOG废物产生的400毫升/克VS的最高累积甲烷产率（CMY）_添加，这比SS的单消化的高98％（202毫升/克VS_添加）。动力学分析表明，在FOG和SS共同消化中，协同作用具有增加的CMY和降解速率常数。对于公用事业而言，共消化可将甲烷产率提高141％；但是，将产生7.77％的生物固体，而总氮将增加6％，这将成为养分管理的潜在负担。总的来说，分批测试的结果证明了SS和FOG与BioAmp预处理共同消化在提高CMY，降解速率常数和VS降低方面的好处。对公用事业的分析表明，共消化可以产生更多的沼气，但同时也可以增加更多的生物固体和总氮返回量。