Shan Xiao-Jing, Yu De-Shuang, Li Jin, Chen Guang-Hui, Feng Li, Lü Ting-Ting, Shao Qing
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
Huan Jing Ke Xue. 2018 Apr 8;39(4):1677-1687. doi: 10.13227/j.hjkx.201706159.
In order to improve the mechanical stability of the material, the embedded raw material combination was studied in the experiment, and seawater was added to optimize the performance of the material. The results indicated that the optimal material ratio was polyvinyl alcohol (PVA 125 g·L)-alginate sodium (SA 20 g·L)-activated carbon (40 g·L). The curing time was 18 h. After adding seawater, the beads were found to have larger pore sizes inside, and the pores were distributed unevenly because of the Hofmeister effect. At the same time, the mechanical stability and biological capacity were found to be significantly higher than those of the fresh water group. The Raman spectra analysis showed that the addition of seawater made the-OH on PVA have greater crosslinking reactions with the crosslinker. The activated sludge was used to treat wastewater containing sea water, and after an operation of 21 d, the removal rate of NH-N was about 90%, and the stoichiometric ratio of △NH-N:△NO-N:△NO-N was stable at 1:(1.04±0.1):(0.17±0.02). From the 21st day to the 46th day, the reactor was run in a steady state. When the nitrogen load rate doubled, the ammonia nitrogen removal rate and stoichiometry had little variations. The total nitrogen removal rate was about 85%, and the total nitrogen removal load rate was 0.2 kg·(m·d).
为提高材料的机械稳定性，实验中研究了嵌入式原料组合，并添加海水以优化材料性能。结果表明，最佳材料比例为聚乙烯醇（PVA 125 g·L）-海藻酸钠（SA 20 g·L）-活性炭（40 g·L）。固化时间为18小时。添加海水后，发现珠子内部孔径更大，且由于霍夫迈斯特效应，孔隙分布不均匀。同时，发现其机械稳定性和生物能力显著高于淡水组。拉曼光谱分析表明，海水的添加使PVA上的-OH与交联剂发生了更大程度的交联反应。采用活性污泥处理含海水废水，运行21天后，NH-N去除率约为90%，△NH-N:△NO-N:△NO-N的化学计量比稳定在1:(1.04±0.1):(0.17±0.02)。从第21天到第46天，反应器稳定运行。当氮负荷率翻倍时，氨氮去除率和化学计量比变化不大。总氮去除率约为85%，总氮去除负荷率为0.2 kg·(m·d)。
