Dept. of Agrochemistry and Environment, Miguel Hernandez University, EPS-Orihuela, Ctra. Beniel Km 3.2, Orihuela, Alicante, 03312, Spain.
Gestión de Residuos Manchegos S.L., Av. Constitución 142, 45710-Madridejos, Toledo, Spain.
J Environ Manage. 2019 Nov 15;250:109437. doi: 10.1016/j.jenvman.2019.109437. Epub 2019 Aug 29.
The objective of this work was to study the possibilities to manage and recycle dog faeces (DF) using biological processes, using two approaches: composting (C) and anaerobic digestion (AD). Thus, different experiments have been carried out: i) two laboratory/pilot scale experiments (self-heating and composting tests) and one, on a commercial scale; ii) two AD experiments. In both approaches, municipal waste such as the organic fraction of municipal solid waste (OMSW) and urban pruning waste (GW) were used as co-substrates. The results obtained regarding the optimization of the composting process indicated that the best strategy was the use of a 1:2 ratio of DF, a 1:4 ratio of OMSW, and a 1:4 ratio of GW, according to the thermal parameters studied (temperature and cumulative quadratic exothermic index (EXI)), and the quality of the compost obtained. A potentially limiting factor of the process was the high salinity of the DF waste. In addition, AD experiments were performed on DF, OMSW, and GW wastes in controlled anaerobic systems at a laboratory scale. In these experiments, the biogas production obtained was 229 mL biogas/g total solids for the DF residue, 248 mL biogas/g total solids for GW, and 263 mL biogas/g total solids for OMSW. The co-digestion yields a clear improvement in the efficiency of the process against the use of a single residue, increasing the production of biogas by up to 27% with respect to that of the DF waste alone during the first 25 days of AD. The results obtained with these procedures have shown the possibilities to add value to this waste in an urban context where the circular economy represents an increasingly favourable scenario, including the generation of fertilisers and/or energy at a local scale, provided that the collection of dog faeces is optimized.
本工作旨在研究利用生物过程管理和回收狗粪（DF）的可能性，采用两种方法：堆肥（C）和厌氧消化（AD）。因此，进行了不同的实验：i）两个实验室/中试规模实验（自热和堆肥试验）和一个商业规模实验；ii）两个 AD 实验。在这两种方法中，均使用城市固体废物的有机部分（OMSW）和城市修剪废物（GW）等城市废物作为共底物。优化堆肥过程的结果表明，根据研究的热参数（温度和累积二次放热指数（EXI））和获得的堆肥质量，最佳策略是使用 DF、OMSW 和 GW 的 1:2、1:4 和 1:4 比例。该过程的一个潜在限制因素是 DF 废物的高盐分。此外，还在实验室规模的控制厌氧系统中对 DF、OMSW 和 GW 废物进行了 AD 实验。在这些实验中，DF 残渣的生物气产量为 229 mL 生物气/g 总固体，GW 为 248 mL 生物气/g 总固体，OMSW 为 263 mL 生物气/g 总固体。与单独使用一种残渣相比，共消化明显提高了过程的效率，在 AD 的前 25 天内，DF 残渣单独使用时的生物气产量增加了 27%。这些程序的结果表明，在循环经济代表越来越有利的情况下，在城市环境中对这种废物进行增值是可能的，包括在当地规模上产生肥料和/或能源，前提是优化狗粪的收集。
