Biocrude oil generation from microalgae and cyanobacteria through hydrothermal liquefaction generates an aqueous by-product (post-hydrothermal liquefaction wastewater (PHWW)) rich in organic matter and aromatic compounds. Although anaerobic digestion has been used with promising results, the process is insufficient to reduce the remaining recalcitrant compounds. Photodegradation using UV/TiO₂ was investigated as a post-treatment system of anaerobically digested-PHWW (AD-PHWW). The effects of initial pH and addition of H₂O₂ on the photodegradation efficiency in terms of chemical oxygen demand (COD), total phenolic content (TPh), and color removal were studied using a face-centered central composite design. Initial pH was highly influential for COD (\(p=0.045)\) and TPh (\(p=0.049)\) removal, whereas the addition of H₂O₂ had a higher impact on color removal (\(p=0.000)\). Optimum conditions at pH of 9.6 and H₂O₂ concentration of 3.55 g L⁻¹ reached values of 50% for COD, 83% for TPh, and 95% for color after 240 min of irradiation. AD-PHWW photodegradation followed a pseudo-first-order kinetic. Energy recovery, including the biocrude oil from Spirulina, resulted in 41%. Results of ecotoxicity assays with Daphania similis and Eruca sativa Mill indicated that PHWW-treated samples were not negatively influenced by TiO₂/UV treatment.

微藻和蓝藻通过水热液化生产生物原油会产生富含有机物和芳香族化合物的水性副产品（水热液化后废水 (PHWW)）。尽管厌氧消化已取得了可喜的结果，但该过程不足以减少剩余的顽固化合物。研究了使用 UV/TiO _{2 的}光降解作为厌氧消化 PHWW (AD-PHWW) 的后处理系统。使用面心中心复合设计研究初始 pH 值和添加 H ₂ O ₂对化学需氧量 (COD)、总酚含量 (TPh) 和颜色去除方面的光降解效率的影响。初始 pH 值对 COD 有很大影响（\(p=0.045)\)和TPh ( \(p=0.049)\)去除，而H ₂ O ₂的添加对颜色去除( \(p=0.000)\)具有更高的影响。在 9.6 的 pH 值和3.55 g L ^{-1 的}H ₂ O ₂浓度下的最佳条件在照射 240 分钟后达到了 50% 的 COD、83% 的 TPh 和 95% 的颜色值。AD-PHWW 光降解遵循伪一级动力学。能源回收率，包括来自螺旋藻的生物原油，达到 41%。用Daphania similis和Eruca sativa Mill进行的生态毒性测定结果表明 PHWW 处理的样品不受二氧化钛的负面影响₂ /UV处理。