Sellami Fatma, Hachicha Salma, Chtourou Mohamed, Medhioub Khaled, Ammar Emna
Ecole Nationale d'Ingénieurs de Sfax, B.P. "W", 3038 Sfax - Tunisie, UR Etude et Gestion des Environnements Urbains et Côtiers, Larsen, Tunisia.
Bioresour Technol. 2008 Oct;99(15):6900-7. doi: 10.1016/j.biortech.2008.01.055. Epub 2008 Mar 6.
In this study, two olive mill wastes - exhausted olive cake (EOC) and paste of olive mill wastewater naturally dehydrated (POMW) - were co-composted and mixed with 25% sesame bark (SB). The humification process was evidenced by quantifying the humic substances and the generally accepted humification indices: (i) the ratio of humic acid (HA) carbon to fulvic acid (FA) carbon (CHA/CFA), (ii) the ratio of water soluble organic carbon (CW) to total organic nitrogen (Cw/Norg), (iii) and the ratio of humic acid carbon to total organic carbon CHA/Corg and by determining the absorbance ratios: E2/E4, E2/E6 and E4/E6. The results showed that the time required to reach maturity was dependant on the chemical properties of the initial raw materials used. The compost including EOC had more nitrogen and synthesised more polymerised HA, the POMW compost also had acceptable degrees of stability and maturity at the end of the process. Maturation was confirmed by a decline in Cw below 1.7, an increase in nitrogen, in HA, in CHA/CFA and an elimination of phytotoxicity. Composts produced with olive mill wastes, experimented on potato culture in the field, can be considered beneficial to soils because of their humification indexes and no toxicity.
在本研究中，将两种橄榄榨油厂废料——废橄榄果渣（EOC）和自然脱水的橄榄榨油厂废水糊状物（POMW）——进行共堆肥，并与25%的芝麻树皮（SB）混合。通过对腐殖物质进行定量以及采用普遍认可的腐殖化指标来证明腐殖化过程：（i）腐殖酸（HA）碳与富里酸（FA）碳的比率（CHA/CFA），（ii）水溶性有机碳（CW）与总有机氮的比率（Cw/Norg），（iii）腐殖酸碳与总有机碳的比率CHA/Corg，并通过测定吸光度比率：E2/E4、E2/E6和E4/E6。结果表明，达到成熟所需的时间取决于所使用初始原料的化学性质。包含EOC的堆肥含有更多氮且合成了更多聚合态HA，POMW堆肥在过程结束时也具有可接受的稳定性和成熟度。通过Cw降至1.7以下、氮、HA、CHA/CFA增加以及植物毒性消除来确认成熟度。用橄榄榨油厂废料生产的堆肥在田间马铃薯种植试验中，因其腐殖化指标和无毒性，可被认为对土壤有益。
