SBR法处理低C/N污水的工程应用——以某基地污水处理站改造工程为例

低C/N污水的生化处理过程中,由于碳源不足,不能满足硝化和反硝化的要求,造成出水NH3-N超标。采用SBR工艺对某基地污水处理站厌氧处理后的低C/N污水进行改造,处理后出水COD去除率达到97%以上,NH3-N去除率达到93%以上。     

NaClO_2/氨水溶液同时脱除SO_2和NO的热力学研究

利用化学热力学基本原理分别对NaClO2/氨水溶液同时脱除SO2、NO的反应过程中摩尔反应吉布斯自由能变、摩尔反应焓变、化学反应平衡常数以及化学反应达到平衡时的SO2和NO的分压力进行了计算,结果表明：利用NaClO2/氨水溶液同时脱除SO2、NO是可行的,且SO2和NO的脱除效率几乎可以达到100%。     

XAFS study of starch-stabilized magnetite nanoparticles and surface speciation of arsenate

It has been shown that starch can effectively stabilize nanoscale magnetite particles, and starch-stabilized magnetite nanoparticles (SMNP) are promising for in situ remediation of arsenic-contaminated soils. However, a molecular level understanding has been lacking. Here, we carried out XAFS studies to bridge this knowledge gap. Fe K-edge XAFS spectra indicated that the Fe-O and Fe-Fe coordination numbers of SMNP were lower than those for bare magnetite particles, and these coordination numbers decreased with increasing starch concentration. The decrease in the average coordination number at elevated stabilizer concentration was attributed to the increase in the surface-to-volume ratio. Arsenic K-edge XAFS spectra indicated that adsorbed arsenate on SMNP consisted primarily of binuclear bidentate (BB) complexes and monodentate mononuclear (MM) complexes. More BB complexes (energetically more favorable) were observed at higher starch concentrations, indicating that SMNP not only offered greater adsorption surface area, but also stronger adsorption affinity toward arsenate.     

固定化斜生栅藻净化畜禽废水中氨氮和磷的影响因素

为探讨Cu2+、p H和流速对固定化斜生栅藻去除畜禽废水中NH+4-N、TP效果的影响,在实验室条件下模拟实际污水处理过程,并采用正交实验方案对结果进行分析。结果表明低质量浓度Cu2+(0~0.05 mg/L)改善藻的净化效果,高质量浓度Cu2+(0.50~5.00 mg/L)抑制藻的净化效果;在p H较高的条件下(p H=9),固定化斜生栅藻的净化效果明显提高;流速对结果没有明显影响。通过正交实验,得出固定化斜生栅藻去除畜禽废水中NH+4-N、TP的优化条件如下:Cu2+质量浓度为0.05 mg/L,p H为9,流速为0.3 m/s。此时NH+4-N去除率为96.11%,TP去除率为97.53%。     

Subcritical water oxidation of propham by H2O2 using response surface methodology (RSM)

This study was conducted to investigate the degradation of propham, which is a compound that pollutes water and seriously threatens human health, by subcritical water oxidation and using H₂O₂ as an oxidising agent. The maximum total organic carbon removal rate of propham was obtained as 73.65% at 40 min of treatment time and 60 mM of H₂O₂ concentration and 373 K of temperature. In addition, response surface method based on the Box-Behnken design was applied to design the degradation experiments of propham for determination of the combined effects of process variables, namely temperature, concentration of oxidising agent and treatment time. The proposed quadratic model of propham degradation, which was examined with the analysis of variance, was used for navigating the design space. The R² and adjusted R² values of the model were determined as 0.9921 and 0.9819 respectively. It was shown that propham was effectively degraded, thus could be removed from the water by using an environmentally friendly method.     

异养硝化及其在污水脱氮中的作用

通过与传统自养硝化作用的比较，异养硝化作用不仅是客观存在的过程，而且某些特殊的异养菌，可以同步进行异养硝化和好氧反硝化，对于污水脱氮具有重要的理论意义和应用价值。     

新型氧化-混凝剂处理染料废水研究

根据染料废水的特点 ,研究了自制产品新型氧化 混凝剂处理染料废水的情况 ,探索了药剂用量、pH值等因素对COD、色度去除率的影响。试验表明 ,当pH >10、“染清”氧化 混凝剂的加入量万分之三左右、絮凝时间 6min、静置沉淀3 5min时 ,该药剂对染料废水具有良好的效果 ,COD和色度的去除率最高分别可达 97%和 86% ,从而证明该方法对于染料废水的处理是可行的。该处理工艺设备简单 ,系统运行稳定 ,操作方便 ,成本低     

微囊藻毒素污染控制技术的研究进展

主要对水环境中微囊藻毒素污染的产生、毒性和去除方法进行了综述,在如何高效去除MCs方面具有重要意义.     

生物化学协同除磷研究

采用聚合硅酸铝和聚合硅酸铁两种混凝剂,比较了将混凝剂直接投加到反应器中和对生物反应器出水再进行混凝沉淀2种工艺的除磷效果,并对2种混凝剂的除磷效果进行了比较.结果表明:对于聚合硅酸铝,没有生物协同作用;对于聚合硅酸铁,投加量在40 mg/L以下时具有生物协同作用,30 mg/L时协同作用最明显;而且聚合硅酸铁的除磷效果好于聚合硅酸铝.     

连续流分段进水生物脱氮工艺控制要点及优化

主要介绍了分段进水生物脱氮工艺的系统工作原理及工艺特性,并探讨了该工艺运行操作和设计的几个重要影响因素,如进水流量分配比、溶解氧、污泥回流比、C/N比等,并在此基础上讨论了分段进水生物脱氮工艺的优化控制对策.