畜牧廢水土壤處理場址之適合度評估及廢水土壤施灌對水體水質pH、導電度、總有機碳及重金屬含量之影響

將二級處理過後之畜牧廢水施灌至土壤作為土壤處理，不但有助於水資源再利用，還可減少廢水處理問題。本研究探討畜牧廢水長期施灌對灌區相關水體水質以及重金屬含量之影響。農委會畜產試驗所（試區I）以及南靖糖廠鹿草農場（試區II），經廢水土壤處理場址選擇評分評估皆屬高適宜性。經過兩年多的地面水及地下水之pH、EC（導電度，electrical conductivity）、TOC（總有機碳，total organic carbon）及各種重金屬含量等水質監測結果發現，試區I及試區II有部分水樣EC值偏高以及TOC量含量較高的情形，乃受雨量多寡及附近民營養鴨場排放畜殖廢水所致。試區II之監測井1水樣於2001年9月及10月份之As濃度，超過地下水污染第二類管制標準值，可能與試區小區域性土壤母質，以及當兩月分均有頗高之累積雨量有關。試區I經二次施灌以及試區II經三次施灌豬糞尿二級處理排放水，其處理區與對照區之地下水樣與相關環境地面水之特定化性與重金屬濃度並無可視之差異；且畜牧廢水中Cu與Zn濃度，低於地下水污染第一類管制標準值，顯見兩試區對試區周遭地下水及地面水之相關水質與重金屬濃度並無影響。

關鍵字

土壤處理；畜牧廢水；重金屬；水質

並列摘要

Treated swine wastewater land application is beneficial to water reuse and reduces wastewater treatment problems. This study evaluated the suitability of soil-treatment sites for swine wastewater and the long-term application effect on soil heavy metal content, especially Cu and Zn. The experimental plots at the Livestock Research Institute (pl ot I) and at the Lutsao Farm (plot II) were evaluated for suitability for soil treatment sites. pH, EC (electrical conductivity), DO (dissolved oxygen), temperature, TOC(total organic carbon), and water sample heavy metals were monitored at farmer wells and surface water. The EC values and TOC contents were higher and the DO values were lower for some water samples from both experimental plots. Moreover, the concentrations in water samples from monitoring well 1 in plot II in September and October, 2001 exceeded the 2nd control standard value (0.5 mg/L) for groundwater pollution. This probably relates to the regional soil parent material characteristics and the highest cumulative amount of rainfall in September 2001. Up to the present time, the experimental plots in plot I and plot II were irrigated with treated swine wastewater two and three times, respectively. There was no apparent difference in specific chemical properties and heavy metal groundwater concentrations and related surface water samples from the treatment and control plots at the two sites befo re and after wastewater application. The Cu and Zn concentrations in the water samples were closely related to the treated swine wastewater characteristics. Samples were even lower than the 1st control standard values for groundwater pollution. This clearly indi cates that treated swine wastewater application to the plots at the two sites did not affect the correlated quality and heavy metal concentrations in the ground and surface water in the experiment plots and their related environments.

並列關鍵字

Land treatment ； Swine wastewater ； Heavy metal ； Water quality

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