科技新发现:猪粪与硅藻土共堆肥中氮转化的途径和机制发表时间:2022-07-21 21:09 西北农林科技大学资源与环境学院张增强教授团队将不同比例硅藻土掺入猪粪和木屑堆肥体系,研究了堆肥过程中氮的转化途径和机制。相关成果发表于Bioresource Technology(IF=7.539)。 •Diatomite (DM) had no obvious negative effect on maturity of composts. •DM promoted the transformation from NH4+-N to AAN and HUN, and thus reduced N loss. •The optimum added dosage of DM in pig manure composting was at 10% among 0–20%. •10% DM reduced the relative abundance of narG, nirS, nirK and nosZ. The aim of this study was to investigate the pathways and mechanisms of nitrogen transformation during the composting process, by adding diatomite (0%, 2.5%, 5%, 10%, 15% and 20%) into initial mixtures of pig manure and sawdust. The results revealed that diatomite facilitated the conversion from NH4+-N to amino acid nitrogen and hydrolysis undefined nitrogen, then reduced NH3 and N2O emission by 8.63–35.29% and 14.34–73.21%, respectively. Moreover, the structure and abundance of nitrogen functional genes provided evidence for nitrogen loss. Furthermore, compared with the control (0.03), the treatment blended with 10% diatomite (T3) had the highest value in composting score (-1.27). Additionally, the ratio of carbon and nitrogen (57.30%) was vital for reducing nitrogen loss among all physio-chemical parameters in this study. In conclusion, adding diatomite was a practical way to enhance nitrogen conservation and increase quality of end products, and the optimum added dosage was at 10%.
2020-08-27
硅藻土是一种硅质岩石,首要散布在中国、美国、日本、丹麦、法国、罗马尼亚等国。是一种生物成因的硅质堆积岩,它首要由古代硅藻的遗骸所组成。其化学成分以SiO2为主,可用SiO2·nH2O表示,矿物成分为蛋白石及其变种。 硅藻土涂料添加剂产品...
2020-08-27
我国的硅藻土矿均属非海相堆积,其间以淡水湖泊相堆积为主。许多区域的硅藻土矿的构成和分布都与重生代以来火山活动有亲密联络。 我国的14个省,已勘清楚七十余个硅藻土矿,以吉林、浙江和云南构成鼎足之势局势。东部沿海、西部新疆、北部黑龙江、南部广...
2020-08-27
硅藻是最早在地球上呈现的一种单细胞藻类,生存在海水或许湖水中,形体极为细小,普通只需几微米到十几微米。硅藻能间断光协作用,自制有机物。常常以惊人的速度生长繁殖。它的遗骸堆积构成硅藻土。硅藻土主要成分是硅酸质,表面有无数细孔,可吸附、合成空气...
2020-08-27
硅藻土助滤剂是以硅藻土为质料,这种质料具有良好的化学稳定性。此外,其质量比较轻;外表有的孔洞比较多,并且孔洞的结构好,所以硅藻土助滤剂吸附才华比较强;强度比较高;可以绝缘;一起还耐磨又绝热。为了让硅藻土助滤剂过滤工作顺利中止,要对过滤的硅藻...
2020-08-27
硅藻土一般是由统称为硅藻的单细胞藻类死亡今后的硅酸盐遗骸形成的,其本质是含水的非晶质SiO2 。硅藻在淡水和咸水中均可生存,种类许多。天然硅藻土的主要成分是SiO2,优质者色白,SiO2含量常超越70%。单体硅藻无色透明,硅藻土的颜色取决于...
2020-08-27
硅藻土具有孔隙度大、接纳性强、化学性质不乱、耐磨、耐热等特征,能为涂料供给优秀的外面机能,增容,增稠和前进附着力。因为它具有较大的孔体积,能使涂膜延长枯燥时分。还可削减树脂的用量,降低成本。市面上硅藻土的品种质量单一,明日宜兴君联硅藻土公司...
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