Wang Wen-Dong, Liu Hui, Zhang Yin-Ting, Yang Sheng-Jiong
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Department of Environmental Technology and Ecology, Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314006, China.
Huan Jing Ke Xue. 2016 Aug 8;37(8):3186-3191. doi: 10.13277/j.hjkx.2016.08.046.
A novel absorbent was prepared by high-temperature calcination using waterworks terminal aluminum coagulation sludge as a raw material. This study discussed ammonia nitrogen adsorption performance of the adsorbent by static adsorption test, mainly investigated the influences of different initial pH, contact time and temperatures on the ammonia adsorption effect, and also analyzed the adsorption isotherms, kinetic and thermodynamic properties of adsorbent on the ammonia nitrogen. Experimental results showed that the adsorbent had a better effect for ammonia removal under neutral conditions; the adsorption process was basically balanced within 6 h, and it followed the pseudo second-order model. Langmuir adsorption model could be better fitted for the adsorption of ammonia adsorbent; the thermodynamic parameters indicated that the adsorption process of ceramic adsorbents on NH-N was a kind of spontaneous, endothermic reaction (Δ <0, Δ >0), and it was found to be a physical adsorption based on the average adsorption energy. Thus, treating ammonia wastewater by coagulation sludge has a good prospect.
以自来水厂末端铝混凝污泥为原料，通过高温煅烧制备了一种新型吸附剂。本研究通过静态吸附试验探讨了该吸附剂对氨氮的吸附性能，主要考察了不同初始pH值、接触时间和温度对氨吸附效果的影响，并分析了吸附剂对氨氮的吸附等温线、动力学和热力学性质。实验结果表明，该吸附剂在中性条件下对氨的去除效果较好；吸附过程在6 h内基本达到平衡，且符合准二级模型。Langmuir吸附模型能更好地拟合氨吸附剂的吸附过程；热力学参数表明，陶瓷吸附剂对NH-N的吸附过程是一种自发的吸热反应（Δ<0，Δ>0），基于平均吸附能判断其为物理吸附。因此，利用混凝污泥处理氨氮废水具有良好的前景。
