铁炉渣在稻田甲烷减排中的应用

Application of Iron Slag in Methane Mitigation in Paddy Fields

为了阐明铁炉渣对稻田甲烷减排的有效性及机制,在介绍了铁炉渣甲烷减排技术的基础上,重点以福州平原稻田为研究区域,采用静态箱法对铁炉渣施加对稻田甲烷排放的影响进行了测定并分析了甲烷减排有效性。结果表明,铁炉渣可有效地减缓稻田甲烷排放,并随着铁炉渣施加浓度从2 mg/hm2增加到8 mg/hm2,其减排效率逐渐增强,特别是对甲烷排放峰值的减排效率最为明显;除了铁受体调节稻田甲烷减排外,pH的变化也在控制甲烷排放的效率上起着重要作用。研究成果可为铁炉渣抑制技术在稻田甲烷减排中的广泛应用提供实验和理论依据。

The research of paddy fields methane reduction is the focus and iron slag is the common inhibitor which contains abundant electron acceptors for the research of methane emission.To clarify the validity of the iron slag inhibition technique application in methane mitigation research,first the iron slag reduction technique was introduced,and the methane emission was measured by the enclosed chamber technique and the validity of iron slag application in methane mitigation research was analyzed in the paddy fields of Fuzhou Plain.The results showed that iron slag could reduce methane emission and the methane emission was decreased as iron slag concentration increment from 2 mg/hm2 to 8 mg/hm2.The methane emission could be especially significantly decreased when it was higher.The change of pH is perhaps another main factor controlling methane emission besides iron electron acceptor in paddy fields.The result of the present research can provide experimental and theoretical basis for the wide application of iron slag mitigation technique in methane reduction.