摘要
以含1mg/L十二烷基苯磺酸钠(SDBS)、浊度为20NTU的高岭土悬浊液为研究对象,投加聚合铝(PAC)进行强化混凝实验,结果表明:PAC的最佳投药量为30～40mg/L,偏碱性条件有利于浊度去除,而偏酸性条件SDBS去除率较高;混合阶段搅拌速度对SDBS去除率影响显著,G=265 s^(-1),T=30 s,而絮凝阶段搅拌时间是影响浊度去除的主要因素,G=23 s^(-1),T=25 min。这时余浊低于0.5 NTU,SDBS去除率达56%,絮体大而密实,不易破碎,分维值较高。纳米SiO_2能进一步改善最优水力条件下PAC的强化混凝效果,SDBS去除率可高于70%。
By adding polymeric alum（PAC ）into kaolin suspension containing （20 NTU, 1 mg/L sodium dodecylbenzene sulfonate （SDBS）） as the research object for enhanced coagulation experiments. The result shows that： the optimal dosage of PAC is30-40 mg/L, the weak alkaline environment is conducive to remove the turbidity and the weak acidity environment is conducive to remove the SDBS; The mixed-phase stirring speed have a significant affect on the removal of SDBS, G=265 s^-1, T=30 s; while the floeculation phase of effects of mixing time is the major factor in turbidity removal when G=23 s^-1, T=25 min. The best flocculation effect is reached at this hydraulic conditions：turbidity is less than 0.5 NTU and the removal rate of SDBS is up to 56 %, flocs show a bigger size, an increased structure and a bigger value of fractal dimension. The optimal hydraulic condition of enhanced coagulation effect by PAC can be further improved when nano-SiO2 is added as flocculant aid：the turbidity is under 0.5 NTU and SDBS removal rate is up to 70 %.
出处
《净水技术》
CAS
2010年第2期10-14,共5页
Water Purification Technology
