Thermal hydrolyzed food waste liquor as liquid organic fertilizer.
Thermal hydrolyzed food waste liquor as liquid organic fertilizer.
复制标题
DOI：
10.1016/j.scitotenv.2021.145786
复制
发表时间：
2021-02
期刊：
影响因子：
--
通讯作者：
Shumei Gao;Dan Lu;Tingting Qian;Yan Zhou
中科院分区：
文献类型：
--
作者：
Shumei Gao;Dan Lu;Tingting Qian;Yan Zhou
热水解是一种有效的餐厨垃圾处理技术。研究了不同温度（140、160、180、200和220 °C）下FW的养分释放情况，并对水解液（HL）作为液体有机肥的可行性进行了评价。以小麦种子和恶臭假单胞菌为材料，研究了HL的植物毒性和生物毒性。结果表明，TH能有效地溶解FW，释放N、P、K养分和有机质。在180 °C时，HL中总氮（TN）和磷（TP）含量最高，分别为1685 mgN/L和235 mgP/L。K+在278-293 mg/L之间，与处理温度无关。中量营养元素Ca、Mg和微量金属元素Fe、Cu、Zn、Al、Co、Mn的含量均较高，重金属元素As、Cd的含量普遍低于0.5mg/L。共鉴定出20种游离氨基酸，最大总浓度为4965.13mg/L。2% HL的发芽指数高于80%，根长和芽长也有所增加。经生物测定证实，未观察到生物毒性。本研究提出了一种可行的方法来溶解餐厨垃圾并生产液体有机肥。
Thermal hydrolysis (TH) is an efficient technology for food waste (FW) management. This study investigated the nutrients released from FW under various TH temperature (140, 160, 180, 200 and 220 °C) and evaluated the feasibility of the hydrolyzed liquor (HL) as liquid organic fertilizer. The phytotoxicity and biotoxicity of HL was analyzed using wheat seed andPseudomonasputida. Results revealed that TH could effectively solubilize FW and release nutrients (N, P and K) and organic substances. The highest content of total nitrogen (TN, 1685 mgN/L) and phosphorus (TP, 235 mgP/L) in the HL was obtained under 180 °C. The K+was 278–293 mg/L regardless of treatment temperature. Secondary nutrients (Ca and Mg) and micro metals (Fe, Cu, Zn, Al, Co and Mn) were all detected at relatively high level, while heavy metals (As and Cd) were generally lower than 0.5 mg/L. Twenty types of free amino acid were identified and the maximum total concentration was 4965.13 mg/L. 2% HL displayed higher germination index (>80%) and enhanced root and shoot lengths. No biotoxicity was observed as confirmed by the bioassay. This study proposes a feasible method to solubilize food waste and produce liquid organic fertilizer.