Analysis of principal components of wastewater affecting soil water repellency
(1. College of Water Resources and Architectural Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, China; 2. The State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 3. Institute of Soil and Water Conservation, CAS ＆ MWR, Yangling, Shaanxi 712100, China; 4. J. Blaustein Institutes for Desert Research, BenGurion University of the Negev, Sede Boker 84990, Israel)
Abstract：In order to identify the effect of irrigation wastewater quality on soil water repellency, the repellency of five oils samples, which belong to three types of waterrepellent soils collected in Israel, was measured for the domestic sewage with 12 different degrees of water pollution. The measured water drop penetration time (WDPT) on the heterogeneity soils was normalized, and the principal components analysis (PCA) was conducted for the nine individual water quality indices in those sewages. Subsequently, the aggregative index (F) of sewage quality was calculated, and the relationship of WDPT to F and individual water quality indices was analyzed. The results showed that there was a positive correlation between WDPT and F for clay and loamy soils, i.e. WDPT rises with increasing F; for sandy soils, however, there was no significant correlation, i.e. WDPT is not affected by degree of water pollution. The results of multiple linear regression showed that there was a significant positive correlation between WDPT and two principal components for clay and loamy soils. Furthermore, the influence of the first principal component was more dominated than the second one.
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