柠檬酸渣可降解地膜的制备及其农用特性的研究

Preparation and properties of biodegradable mulching films based on citric acid fermentation residue

为解决聚乙烯类农用地膜的大量使用引起的一系列环境问题,并且充分利用发酵工业中产生的有机生物质废弃物,以柠檬酸发酵菌渣为原料,制备了生物可降解农用地膜。针对预处理条件进行了温度、时间和碱浓度的优化,使其具备农用标准。研究结果表明:生物可降解膜较裸地的对照组地温可提升5~7℃,保墒性能与传统市售地膜相当;与裸地的对照组相比,覆盖有柠檬酸渣膜的土壤棉花产量可提高5.5%。这说明柠檬酸渣是优良的生物可降解地膜原料。

To solve a series of environmental problems caused by the extensive use of polyethylene agricultural mulch film, the citric acid residue from the fermentation industry was utilized as a raw material to prepare biode- gradable mulching films. In order to meet the demands of agricultural usage, the pretreatment conditions were optimized by varying the temperature, time and alkali concentration. The study showed that biodegradable films demonstrated soil temperatures some 5 -7 ℃ higher than the un-mulched control, with moisture maintenance comparable with commercial films. When compared with the non-mulched control, mulching with the biodegradable films increased cotton yields by about 5.5%. The results of this biodegradable raw material. work show that citric acid fermentation residue is a good biodegradable raw material.