CAJ | 학술논문

以粉煤灰为原料制备聚硅酸铁铝(PSFA)混凝剂，在单因素试验的基础上采用响应面法对关键工艺参数进行了优化，用 Box-Behnken 建立并分析了二次多项式数学模型的有效性及各因素与浊度去除率(PNR)的交互作用。结果表明：3个因素对PNR的影响大小为粉煤灰/Na2CO3(w/w)>pH>熟化时间，最佳工艺参数为：粉煤灰/Na2CO3(w/w)=1.51， pH=3.13以及熟化时间=25.79 h，该条件下模型预测值PNR=94.46%，实际PNR为95.67%，该回归模型具有较好的预测性能，可用于指导生产实践。优化条件下，溶出液中Al、Fe平均浓度分别为4725 mg×L-1和4236 mg×L-1，相应的平均溶出率为32.8%、54.3%。由FT-IR推断PSFA是由多种金属元素构成单核或多核羟基配合物形成的无机高分子聚合物，由ζ-电位及激光衍射粒度分析表明PSFA具有很强中和胶体电荷以及吸附架桥能力。PSFA处理焦化废水相比聚合硫酸铁有更宽的pH适用范围(6~10)及更高的COD去除率。
이분매회위원료제비취규산철려(PSFA)혼응제，재단인소시험적기출상채용향응면법대관건공예삼수진행료우화，용 Box-Behnken 건립병분석료이차다항식수학모형적유효성급각인소여탁도거제솔(PNR)적교호작용。결과표명：3개인소대PNR적영향대소위분매회/Na2CO3(w/w)>pH>숙화시간，최가공예삼수위：분매회/Na2CO3(w/w)=1.51， pH=3.13이급숙화시간=25.79 h，해조건하모형예측치PNR=94.46%，실제PNR위95.67%，해회귀모형구유교호적예측성능，가용우지도생산실천。우화조건하，용출액중Al、Fe평균농도분별위4725 mg×L-1화4236 mg×L-1，상응적평균용출솔위32.8%、54.3%。유FT-IR추단PSFA시유다충금속원소구성단핵혹다핵간기배합물형성적무궤고분자취합물，유ζ-전위급격광연사립도분석표명PSFA구유흔강중화효체전하이급흡부가교능력。PSFA처리초화폐수상비취합류산철유경관적pH괄용범위(6~10)급경고적COD거제솔。
The coagulant of Poly-Silicon-Ferric-Aluminum (PSFA) was prepared by using fly ash as the main raw material. Based on the single factor experiments, the key process parameters were optimized by the response surface methodology (RSM). Using Box-Behnken method, the second order quadratic method was established, and the applicability of the model and the interaction between the model factors and the Percent NTU Removal (PNR) were analyzed. The results indicate that the effect order of the three factors on PNR is as follows:weight ratio of fly ash to Na2CO3>pH>aging time. The optimal technical parameters for achieving the highest PNR were obtained as following: weight ratio of fly ash to Na2CO3 is 1.51, pH value is 3.13 and the aging time is 25.79 h. Under above optimal conditions, the PNR reaches 94.46%, the average concentrations of Al and Fe in the stripping liquid are 4725 and 4236 mg×L-1, and the corresponding average dissolution ratios are 32.8%and 54.3%, respectively. By the deduction of FT-IR, the PSFA is a type of inorganic high polymers and a combination of single/poly-nuclear hydroxyls complexes constructed by two or more metal elements. PSFA has strong capabilities of colloid charge neutralization and “bridge” adsorption, and when treating coking wastewater, compared with traditional PFS, the PSFA has a higher COD removal efficiency and a wider applicable pH range (6~10).