Duan Xiaojing, Lesikar Bruce J, Kenimer Ann L, Arnold Michael A, Persyn Russell A
Wood, Patel & Associates, Phoenix, Arizona, USA.
Water Environ Res. 2008 Feb;80(2):142-8. doi: 10.2175/106143007x220770.
Subsurface drip distribution is an important on-site wastewater treatment technique widely used with various soil types and restricted site conditions. This study evaluated the performance of five subsurface wastewater drip products under eight pressures, ranging from 0 to 310 kPa. Results showed that Netafim Bioline pressure-compensating emitters (Netafim Irrigation Inc., Fresno, California) had an application uniformity coefficient of 95% and a coefficient of variance (C(v)) of 4.9%. The average uniformity coefficient of Geoflow Wasteflow products (Geoflow USA, Charlotte, North Carolina) was 94.4%, with a C(v) value of 6.8%. Flowrate and pressure relationships were developed by analyzing low and normal operational pressure ranges, and R-square values ranged from 1.000 to 0.301. Geoflow pressure-compensating products were non-pressure-compensating emitters under low pressure. Netafim pressure-compensating emitters were partially pressure-compensating under low pressures. In normal operational pressure ranges, both Geoflow and Netafim products were fully pressure-compensating. Netafim pressure-compensating products were characterized as pressure-compensating over the full range of operational pressures.
地下滴灌分布是一种重要的现场废水处理技术，广泛应用于各种土壤类型和受限场地条件。本研究评估了五种地下废水滴灌产品在0至310 kPa的八种压力下的性能。结果表明，耐特菲姆Bioline压力补偿式滴头（耐特菲姆灌溉公司，加利福尼亚州弗雷斯诺）的应用均匀系数为95%，变异系数（C(v)）为4.9%。Geoflow Wasteflow产品（美国Geoflow公司，北卡罗来纳州夏洛特）的平均均匀系数为94.4%，C(v)值为6.8%。通过分析低运行压力范围和正常运行压力范围建立了流量与压力关系，决定系数（R平方）值范围为1.000至0.301。Geoflow压力补偿产品在低压下是非压力补偿式滴头。耐特菲姆压力补偿式滴头在低压下是部分压力补偿的。在正常运行压力范围内，Geoflow和耐特菲姆产品都是完全压力补偿的。耐特菲姆压力补偿产品的特点是在整个运行压力范围内都具有压力补偿功能。
