Large Commercial-scale Grain Bulk Fumigation with Cylinderized Pure Phosphine Coupled with the Nitrogen Generator System
LI Yan-yu1, JIN Xiu-xin2, JIN Wei-bo3, ZHANG Hui-yan1,4, WANG Tao5
(1. Institute of Grain Storage and Logistic, Academy of National Food and Strategic Reserves Administration, Beijing 100037, China;
2. Wenzhou Grain and Oil Storage and Logistics Co., Ltd, Wenzhou, Zhejiang 325000, China; 3. Wenzhou Grain Storage and Acquisition Co., Ltd, Wenzhou, Zhejiang 325000, China; 4. College of Horticulture and Horticulture, Tianjin Agricultural University, Tianjin 300392, China; 5. Yilong Electronic Technology (Guizhou) Co. Ltd, Kaiyang, Guiyang 550300, China)
Abstract: Phosphine is a major fumigant for insects control in stored products. However, the current fumigation with aluminum phosphide to generate phosphine is facing many challenges, such as require manual operation, fumigation produce can’t be automatically performed, and management of residue contaminants. To address these issues, the study utilizes a combination of pure phosphine gas from cylinders and nitrogen from a membrane separation nitrogen generator. Phosphine and nitrogen are mixed at predetermined ratios, and the resulting gas mixture is delivered directly into sealed grain storage facilities via a controlled release device and circulated within the grain piles to ensure fumigant evenly distribution. This maintains effective phosphine concentrations within the storage facility. The exposure duration lasted for 13 days, during which phosphine concentrations were monitored, and the total mortality rate of adult insects within the grain piles was recorded. Within 9 hours of treatment initiation, gas concentrations reached 736 mL/m3, peaking at 1 160 mL/m3, with an effective average concentration above 200 mL/m3 sustained for 10 days. The gas circulated and distributed uniformly within the treated space, enabling effective control of major stored commodity pests within a relatively short exposure period.
Key words: fumigation; cylinderized pure phosphine; nitrogen generator; on-site dilution; distribution
Chinese Library Classification Number: TS205
Documentary Identification Code: A Article ID: 1007-7561(2024)03-0069-06
Published time on CNKI: 2024-05-10 10:00:05
Published address on CNKI: https://link.cnki.net/urlid/11.3863.ts.20240509.1054.010
