138-13 How Do Cleaning Compounds and Treatment Methods Effect Winery Wastewater Chemistry and Soils of Contrasting Mineralogy Receiving the Treated Wastewater?.



Monday, October 17, 2011
Henry Gonzalez Convention Center, Hall C, Street Level

Maya C. Buelow1, Kim Mosse2, G. Stuart Pettygrove1, Kerri Steenwerth1 and Sanjai Parikh1, (1)University of California - Davis, Davis, CA
(2)School of Biological Sciences/ Centre for Green Chemistry, Monash University, Melbourne, Australia
The impact of both current (Na- and P-rich water) and emerging (K-rich) wastewaterapplications on soil fertility, soil physical and chemical properties is not well known. Irrigationwith treated wastewater has potential for both positive and negative consequences for soilproperties. For this study, background surveys were conducted to assess winery watertreatment methods and volumes, as well as types and amounts of cleaning agents used.Monthly winery wastewater samples are collected to represent water leaving the winerybefore treatment and after treatment. Basic water chemistry analysis includes pH, electricalconductivity (EC), and concentrations of anions (Cl-, NO3-, SO42-, and HPO42-) and cations(Ca2+, Na+, K+, Mg2+), measured via ion chromatography. The sodium absorption ratio (SAR)and potassium absorption ratio (PAR) have been determined. Additionally, the water isanalyzed for total organic carbon and biological oxygen demand (BOD). This approachpermits evaluation of the treatment method, as well as an understanding of temporal shiftsin wastewater composition. Generally, the EC of the effluent of very large wineries (1mil. gal/yr production or more) has been 1000-2100 uS/cm, whereas small to medium (Less than 1mil.gal/yr) have fallen within the 200-800 uS/cm. EC values, and other measured parameters,vary seasonally, reaching highs usually during October. Column experiments are ongoing tocompare the effects of Na-rich and K-rich solution chemistry on soil dispersion and hydraulicconductivity. Soil mineralogy is hypothesized to exhibit a large influence on the effect of K insoils. To examine this relationship, these experiments will be conducted with vineyard soils ofdiverse mineralogy, from the Napa and Lodi region, to simulate the effects of irrigation with K-rich winery wastewaters.
See more from this Division: S06 Soil & Water Management & Conservation
See more from this Session: Monitoring Water Quantity and Quality at the Field Edge: Methodologies and Case Studies: II