低温条件下黑藻对模拟污水的净化能力

沉水植物在净化污染水体中的应用已得到国内外广泛关注。试验选取沉水植物黑藻为研究对象，在实验室内模拟中国北方冬季低温环境（4 ℃、500~800 lx），研究黑藻的投加量对模拟污水中氮的净化效果及其对水体的影响。结果表明，在试验周期内，黑藻在该低温条件下能维持基本生命活动，通过光合作用可提高水体pH至8.0以上，维持水体DO浓度为3~5 mg/L。黑藻投加量为17.5 g/L时对NH₄⁺-N和TN的去除效果最佳，最终去除率分别为25.29%和20.97%。投放黑藻后，一方面强化了植物吸收；另一方面，通过改变系统环境，强化了硝化反硝化作用和氨的挥发作用，实现了水体中氮的强化去除。

The Purification Ability of Hydrilla verticillata on Simulated Wastewater under Low Temperature

Submerged plant were paid wide attention to by both at home and abroad for its purification capacity on polluted water body. The purification ability of Hydrilla verticillata on simulated wastewater was studied under the temperature of 4 ℃ and the light intensity of 500-800 lx, and the nitrogen removal effects under different dosages of Hydrilla verticillata in simulated waterwater were investigated. The results showed that Hydrilla verticillata could maintain life activities in the low temperature conditions in the experimental period. Simultaneously, the pH of water was improved to over 8, and the concentration of dissolved oxygen maintained in 3-5 mg/L by the photosynthesis of Hydrilla verticillata. When the dosage of Hydrilla verticillata was 17.5 g/L, the highest removal rate of NH4+-N and TN could be obtained, being 25.29% and 20.97%, respectively. Due to the addition of Hydrilla verticillata, the plant uptake capacity of nitrogen was intensified, and the nitrification, denitrification and ammonia volatilization were also strengthened due to the change of micro environment of the system, thus realizing intensive removal of nitrogen in the water.