沼液酸化贮存技术研究进展

酸化贮存技术在降低沼液养分损失与气体减排方面具有优势，系统梳理沼液酸化贮存技术研究进展可为规范沼液贮存方式，协同降低养分损失与气体排放技术实施提供数据支撑。采用文献数据整理的方式，对酸化技术影响因素，酸化对沼液特性的影响效果与作用机理，酸化对多种气体减排效果的影响进行总结和分析。结果表明:1)酸化剂、酸化目标pH、贮存时间、方式、温度均会影响酸化贮存作用效果；2)酸化会通过降低沼液pH，改变缓冲物质之间的平衡，促进无机矿物质的溶解与有机物的降解，降低微生物活性与氨气(NH₃)排放量等方式影响沼液性质和降低养分损失；3)沼液酸化剂的科学选择、酸化技术参数的规范设定、酸化贮存过程的元素各化学形态转化机理以及酸化沼液产品的还田效果等有待深入研究。

Advances on digestate acidizing storage technology

Acidizing storage has advantages in reducing nutrient loss and gas emissions. Systematic review on the acidizing storage of digestate can provide data support for standardizing storage methods of digestate and cooperating with the implementation of reducing nutrient loss and gas emission technology. Through literature data organization, the influencing factors of acidification, the effect and mechanism of acidification on the characteristics of digestate, and the emission reduction effects of acidification on various gases were summarized and analyzed in this study. The results showed that: 1)Acidifier type, acidizing target pH, storage time, acidizing method, and temperature may all affect the effect of acidizing storage. 2)Acidification affects digestate properties and reduce nutrient loss by reducing pH, changing the balance among buffer substances, promoting the dissolution of inorganic minerals and degradation of organic matter, reducing microbial activity and ammonia(NH₃)emissions, etc. 3)The scientific selection of acidifier, the specification setting of acidizing technical parameters, the mechanism of transformation of chemical forms of elements in acidizing storage process and the returning to field effect of acidized digestate products need further study.