Batziaka V, Fytianos K, Voudrias E
Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
Environ Monit Assess. 2008 May;140(1-3):331-8. doi: 10.1007/s10661-007-9871-3. Epub 2007 Sep 1.
Biosolids from the WWTP of Thessaloniki were examined for the leaching of phosphorus (as PO4(3-) -P), nitrogen (as NH4+ (-N) and NO3- (-N)), and organic matter (as TOC and COD), using two tests: (1) a pH static leaching test and (2) a characterization test, relating contaminant release to the liquid to solid (L/S) ratio. Moreover, a Microtox toxicity test was conducted, to examine the pH dependency of the toxicity of the sludge leachate on the Vibrio fischeri bacterium. Maximum phosphorus release was observed at pH < 3 and at pH > 10. Ammonium nitrogen exhibited maximum leachability at near neutral pH conditions, while nitrate nitrogen exhibited a mild increase in the leachate, as the leachant pH increased from 2 to 12. Both TOC and COD exhibited an increase in the leachate concentration, as the leachant pH was increased from 2 to 12. Ecotoxicological analysis showed that maximum toxicity occurred at very low and very high pH-conditions. As liquid-to-solid ratio increased, the leachate concentration (in mg/l) of all parameters studied decreased. The results of the study were used to conduct a release assessment estimate for the case of Thessaloniki.
利用两种测试方法，对塞萨洛尼基污水处理厂的生物固体进行了磷（以PO4(3-) -P形式）、氮（以NH4+ (-N)和NO3- (-N)形式）以及有机物（以TOC和COD形式）的浸出情况检测：（1）pH静态浸出试验；（2）表征试验，该试验将污染物释放与液固比（L/S）相关联。此外，还进行了微毒性测试，以研究污泥浸出液对费氏弧菌毒性的pH依赖性。在pH < 3和pH > 10时观察到最大磷释放量。铵态氮在近中性pH条件下表现出最大浸出性，而随着浸提液pH从2增加到12，硝态氮在浸出液中的含量略有增加。随着浸提液pH从2增加到12，TOC和COD在浸出液中的浓度均有所增加。生态毒理学分析表明，在极低和极高pH条件下出现最大毒性。随着液固比增加，所研究的所有参数的浸出液浓度（mg/l）均下降。该研究结果用于对塞萨洛尼基的情况进行释放评估估算。
