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以聚合氯化铝(PAC)为混凝剂,分别以纳米SiO2和粉末活性炭P-AC为助凝剂,对含有不同微污染物SDS、NH3-N或HA)的6 NTU高岭土低浊水进行混凝沉降试验,借助形态学理论和电镜观察与图像分析技术,研究纳米SiO2与P-AC对PAC于微污染物去除的助凝特性和絮凝形态学特性。结果表明,纳米SiO2对微污染物HA、SDS及NH3-N的助凝效果具有一定的选择性,对HA和SDS的作用效果明显,但对NH3-N几乎没有去除作用;纳米SiO2能促使PAC对微污染物HA、SDS的去除率分别提高40%～50%、30%～40%;P-AC能使PAC于HA的去除率提高约10%,但对小分子微污染物SDS、NH3-N的去除效果改善不明显;助凝剂纳米SiO2能提高PAC絮体结构的密实度和分维值,显著提高PAC对微污染物的去除率,而P-AC对絮体形态学特性改善效果不明显。
The 6 NTU kaolinite low-turbidity water containing different micro-pollutants SDS, NH3-N or HA was treated with polyaluminum chloride (PAC) as coagulant and nano-SiO2 and powdered activated carbon P-AC as coagulant respectively Coagulation sedimentation test, with the aid of morphological theory and electron microscope observation and image analysis technology, the nano-SiO2 and P-AC on the PAC in micro-pollutant removal coagulant characteristics and flocculation morphology. The results show that nano-SiO2 has certain selectivity for the coagulation-promoting effect of micro-pollutants such as HA, SDS and NH3-N, has obvious effect on HA and SDS, but has little removal effect on NH3-N; nano- The removal rates of micro-pollutants HA and SDS were increased by 40% -50% and 30% -40%, respectively. P-AC could improve PAC removal efficiency by about 10% -N is not obvious. The coagulant nano-SiO2 can improve the compactness and fractal dimension of PAC flocs, increase the removal rate of PAC to micro-pollutants significantly, and P-AC can improve the morphological characteristics of flocs no significant effect.