Co-application of biogas slurry and hydrothermal carbonization aqueous phase substitutes urea as the nitrogen fertilizer and mitigates ammonia volatilization from paddy soil
Co-application of biogas slurry and hydrothermal carbonization aqueous phase substitutes urea as the nitrogen fertilizer and mitigates ammonia volatilization from paddy soil
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沼液与水热炭化水相联施替代尿素作为氮肥减少稻田氨挥发
DOI：
10.1016/j.envpol.2021.117340
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发表时间：
2021
影响因子：
8.9
通讯作者：
Chu Qingnan
中科院分区：
文献类型：
--
作者：
Li Detian;Cheng Yueqin;Li Tianling;Sun Haijun;Xue Lihong;Cui Hongbiao;Feng Yanfang;Yang Linzhang;Chu Qingnan
沼液(BS)和生物废弃物水热碳化水相(HP)是一种富营养化废水。为了防止环境污染，将BS和HP转化为农业领域的合成肥料，有可能实现资源化利用。我们推测，酸性HP可以中和碱性BS，将洪水的pH值从6.88调节到8.00，并减少水稻土中氨的挥发。在本土柱试验中，将BS和HP的混合物应用于水稻土中，分别替代50%、75%和100%的尿素。根据幽门螺杆菌的低(L)率或高(H)率，将处理分为BCL50、BCL75、BCL100、BCH50、BCH75和BCH100。3D-EEM分析结果表明，BS和HP的主要成分分别为微生物副产物和类黄腐酸物质。与CKU相比，BS和HP配施可降低土壤NH3挥发量4.2%~65.5%。与对照相比，BCL100和BCH100处理显著(P<；005)降低了NH3挥发量65.5%和56.8%，产量尺度NH3挥发量分别降低了49.6%和42.3%。洪涝水中NH4+-N浓度和pH值偏低是NH3缓解的主要原因。因此，本研究表明，BS和HP配合施用可以合理替代尿素作为一种有价值的氮肥，同时也能减缓NH3的挥发。这项研究将为氨缓解背景下BS和HP资源的利用提供新的思路。
Biogas slurry (BS) and bio-waste hydrothermal carbonization aqueous phase (HP) are nutrient-rich wastewater. To prevent environment contamination, transforming BS and HP into synthetic fertilizers in the agricultural field can potentially realize resource utilization. We hypothesized that acidic HP could neutralize alkaline BS, adjusting floodwater pH from 6.88 to 8.00 and mitigating ammonia (NH3) volatilization from the paddy soil. In this soil column study, the mixture of BS and HP was applied to paddy soil to substitute 50%, 75%, and 100% to urea. With a low (L) or high (H) ratio of HP, treatments were labeled as BCL50, BCL75, BCL100, BCH50, BCH75, and BCH100. Results showed that microbial byproduct- and fulvic acid-like substance were the main components in BS and HP using 3D-EEM analysis, respectively. Co-application of BS and HP mitigated the NH3volatilization by 4.2%–65.5% compared with CKU. BCL100 and BCH100 treatments significantly (P< 0.05) mitigated NH3volatilization by 65.5% and 56.8%, which also significantly (P< 0.05) mitigated the yield-scale NH3volatilization by 49.6% and 42.3%, compared with CKU. The low NH4+-N concentration and pH value in floodwater were the main reason explained the NH3mitigation. Therefore, this study demonstrated that BS and HP co-application can substitute the urea as a valuable N fertilizer in a rational rate and meanwhile mitigate the NH3volatilization. This study will provide new ideas for the utilization of BS and HP resources in the context of ammonia mitigation.