农业工程学报2017，Vol.33Issue(5)：96-101,6.DOI:10.11975/j.issn.1002-6819.2017.05.014
NaC1及生物降解活性剂对曝气灌溉水氧传输特性的影响
Impact of NaCl and biodegradable surfactant on water and oxygen transmission under aerated irrigation
摘要
Abstract
Aerated irrigation can effectively alleviate the oxygen stress in the plant root zone and improve the environment of the plant root zone.This study investigated the effect of the addition of surfactant BS1000 in saline irrigation water on water and oxygen transmission under pure oxygen aerated irrigation.The oxygen transmission characteristic was investigated by using a Mazzei air injector,pressure swing adsorption oxygen generator and Seair diffuser coupled system (AirSep-SeairMazzei).Micro-bubbles produced by the AirSep-Seair-Mazzei system provide a good opportunity for its application in the long-distance aerated irrigation because of slow buoyancy characteristics and high dissolved oxygen concentration.The dissolved oxygen (DO) and temperature of water tank and drip tap were monitored by a dissolved oxygen meter.For simulating saline irrigation water,0.1 mol/L NaCl solution was prepared.Four B S 1000 concentrations were also prepared (0,1,2 and 4 mg/L).Therefore,a total of 8 combinations of NaC1 and BS 1000 were designed.During the experiment,oxygen transfer coefficient,DO saturation,flow uniformity coefficient and DO uniformity coefficient were determined.The results showed that the addition of B S 1000 had a positive effect of oxygen transfer process,and resulted in an increase of the DO saturation.The DO saturation of the irrigation water averaged 299.87％ under pure oxygen aeration.Under the addition of BS 1000 in the aerated irrigation,an increase of the BS1000 concentration caused an increase of the oxygen transfer coefficient,while a decrease of the DO saturation.The oxygen transfer coefficient of 2 and 4 mg/L BS 1000 was 22.76％ and 46.90％ higher than that of 1 mg/L BS1000,respectively,under the condition without NaCl addition.Under the addition of NaC1 in the aerated irrigation water,the high surfactant concentration (not less than 2 mg/L) would result in a large oxygen transfer coefficient.The addition of NaC1 could inhibit the DO saturation.The DO saturation in treatments of surfactant BS1000 of 0,2 and 4 mg/L with NaCl addition was decreased by 5.55％,4.92％ and 6.57％,respectively,compared to the treatment without NaC1.The average value of flow uniformity coefficient under the aerated irrigation was greater than 95％ and the DO uniformity coefficient of each combination remained above 97％.The high DO had a positive effect of the growth of crop when the oxygen concentration in soil water was lower than the upper limit demanded by crop.The oxygen transfer coefficient was greater than 18.85％ (P＜0.05) under the addition of surfactant BS1000.The DO saturation was the highest in the treatment with 1 mg/L BS1000 regardless of NaC1 addition.And all the treatments had high uniformity.Therefore,the surfactant concentration of 1 mg/L was suggested.This research demonstrates the great importance of uniform transmission of super-oxygenated water in drip tap and provides a method support for a wide range of aerated irrigation application.关键词
咸水/溶解氧/灌溉/纯氧曝气/BS1000/氧总传质系数/饱和度/均匀性Key words
saline water/dissolved oxygen/irrigation/pure oxygen aeration/BS 1000/oxygen transfer coefficient/saturation/uniformity分类
农业科技引用本文复制引用
雷宏军,刘欢,张振华,Bhattarai Surya,Balsys Ron..NaC1及生物降解活性剂对曝气灌溉水氧传输特性的影响[J].农业工程学报,2017,33(5):96-101,6.基金项目
国家自然科学基金(U1504512、41271236) （U1504512、41271236）
河南省科技创新人才项目(174100510021) （174100510021）
