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首页> 外文期刊>Applied Engineering in Agriculture >EVALUATION OF CALCIUM ALGINATE ENTRAPPED NANO ZINC OXIDE TO REDUCE GASEOUS EMISSIONS FROM LIQUID DAIRY MANURE
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EVALUATION OF CALCIUM ALGINATE ENTRAPPED NANO ZINC OXIDE TO REDUCE GASEOUS EMISSIONS FROM LIQUID DAIRY MANURE

机译：藻酸钙包埋的纳米氧化锌减少液态乳制品产生的气体排放的评估

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摘要

Direct application of nanoscale zinc oxide (nZnO) particles has shown promising results in controlling gaseous emissions (hydrogen sulfide-H2S, methane-CH4, and carbon dioxide-CO2) from livestock liquid manure under anaerobic storage conditions. However, application of bare (unmodified) nanoparticles (NPs) could raise environmental concerns as their fate and transport are not well documented. Keeping this in mind, an innovative method has been adopted where NPs were entrapped in biopolymer beads that ensured that NPs were not released to the environment and can be recovered. The objective of this research was to evaluate the performance of calcium (Ca)-alginate entrapped nZnO (alginate-nZnO beads) and associated mechanisms involved in controlling gaseous emission from liquid dairy manure. Experiments were conducted in 1 L Erlenmeyer flasks with a working volume of 500 mL, where alginate-nZnO beads containing 3 g L-1 of NPs were applied freely, as well as loosely contained in mosquito net bags. Headspace gas was collected every 2 to 5 days during the 33-day experiment and analyzed for H2S, CH4, and CO2 concentration. Bacterial growth analysis and sorption test were also carried out to see the effect of NPs on microbial survivability and gaseous sorption capability, respectively. The concentration of H2S, CH4, CO2, and total gas production was significantly reduced by 99%, 51%, 27%, and 43%, respectively, when beads were applied freely; while these reductions were 96%, 18%, 14%, and 20%, respectively, when beads were applied loosely in bags (P0.05). Though both methods performed well, free beads application method outperformed the other application method.
机译：在厌氧存储条件下，直接应用纳米级氧化锌（nZnO）颗粒在控制畜禽粪便中的气体排放（硫化氢-H2S，甲烷-CH4和二氧化碳-CO2）方面显示出令人鼓舞的结果。然而，裸露的（未修饰的）纳米颗粒（NPs）的应用可能引起环境问题，因为它们的命运和运输没有得到充分的记录。牢记这一点，已采用了一种创新方法，其中将NP截留在生物聚合物珠粒中，以确保NP不会释放到环境中并可以回收。这项研究的目的是评估（Ca）-海藻酸钙截留的nZnO（海藻酸-nZnO珠）的性能以及与控制液态乳牛粪中气体排放有关的相关机制。在工作量为500 mL的1 L锥形瓶中进行实验，将含有3 g L-1 NP的藻酸盐-nZnO珠粒自由散装，并散装在蚊帐袋中。在33天的实验过程中，每2至5天收集一次顶空气体，并分析H2S，CH4和CO2浓度。还进行了细菌生长分析和吸附试验，分别观察了纳米粒对微生物存活率和气体吸附能力的影响。当自由使用磁珠时，H2S，CH4，CO2和总产气的浓度分别显着降低了99％，51％，27％和43％。而当将珠子松散地装在袋子中时，这些减少分别为96％，18％，14％和20％（P <0.05）。尽管两种方法均表现良好，但游离珠的涂覆方法优于另一种涂覆方法。

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