Institute of Environmental Engineering, Częstochowa University of Technology, Brzeźnicka 60a, 42-200 Częstochowa, Poland.
Institute of Environmental Engineering, Częstochowa University of Technology, Brzeźnicka 60a, 42-200 Częstochowa, Poland.
Bioresour Technol. 2017 Feb;225:206-214. doi: 10.1016/j.biortech.2016.11.049. Epub 2016 Nov 15.
Sewage sludge derived biochar (SSDB) was used as a supplementary material for municipal sewage sludge (SS) and wood chips mixtures (WC) treated by combined composting and vermicomposting. SSDB added to the mixture before composting resulted in significantly higher reproduction rate: on week 4 the number of cocoons increased by 213% when compared to the mixture with no biochar. On week 6 the average number of juveniles increased 11-fold in the mixture with biochar added before composting and 5-fold in the mixtures with biochar added after composting when compared to the mixture with no biochar. Biochar added before composting reduced bioavailability of Cd and Zn to E. fetida. The biochar-added vermicomposts showed good fertilizing properties except for elevated concentrations of Cr. The pH of all vermicomposts was in the range of 5.27-5.61. The obtained vermicomposts can be used as a growing medium for horticultural purposes or as an amendment in calcareous soils.
污水污泥衍生生物炭 (SSDB) 被用作城市污水污泥 (SS) 和木屑混合物 (WC) 的补充材料，这些混合物经过了联合堆肥和蚯蚓堆肥处理。在堆肥前将 SSDB 添加到混合物中，会导致更高的繁殖率：与不含生物炭的混合物相比，第 4 周时茧的数量增加了 213%。在添加生物炭的混合物中，与不含生物炭的混合物相比，第 6 周时幼虫的平均数量增加了 11 倍，而在堆肥后添加生物炭的混合物中增加了 5 倍。在堆肥前添加生物炭降低了 Cd 和 Zn 对赤子爱胜蚓的生物利用度。添加生物炭的蚯蚓堆肥除了 Cr 浓度升高外，还具有良好的施肥性能。所有蚯蚓堆肥的 pH 值均在 5.27-5.61 范围内。获得的蚯蚓堆肥可用作园艺目的的生长介质或在石灰性土壤中作为改良剂。
