Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland.
Bull Environ Contam Toxicol. 2012 Nov;89(5):975-7. doi: 10.1007/s00128-012-0816-3. Epub 2012 Sep 14.
We assessed the toxicity of ammonia ions to Stentor coeruleus and Coleps hirtus (Protozoa) isolated from activated sludge taken from two municipal wastewater treatment plants in southern Poland. Stentor coeruleus is a rarely occurring species in activated sludge, unlike the widespread Coleps hirtus. The mean LC50 values (concentration causing 50 % mortality) calculated for the 24 h tests differed hugely between the tested species: 43.03 mg NH(4+) dm(-3) for Stentor coeruleus and 441.12 mg NH(4+) dm(-3) for Coleps hirtus. The ammonia ion concentration apparently is an important factor in the occurrence of these protozoan species in activated sludge.
我们评估了氨离子对从波兰南部两个城市污水处理厂活性污泥中分离出的Stentor coeruleus 和 Coleps hirtus(原生动物)的毒性。Stentor coeruleus 是活性污泥中一种罕见的物种,不像广泛存在的 Coleps hirtus。24 小时测试的平均 LC50 值(引起 50%死亡率的浓度)在测试物种之间差异巨大:Stentor coeruleus 为 43.03 毫克 NH(4+) dm(-3),Coleps hirtus 为 441.12 毫克 NH(4+) dm(-3)。显然,氨离子浓度是这些原生动物在活性污泥中出现的重要因素。