Function of Fly Ash for Settling Fl

Function of Fly Ash for Settling Floc
Record of floc settlement with and without fly ash as co-coagulant is shown in Fig. 5.
It is demonstrated that the addition of fly ash helps to accelerate the formation and
settlement of the floc, which is reduced into a stable volume within less than 5 min.
The final volume of the floc with co-coagulation by fly ash is only about one-third
of that without fly ash.
Mechanism for Co-coagulation of Dye Solution by Fly Ash
Fly ash consist of irregular particles containing SiO2, Al2O3, Fe2O3, and CaO etc.
This shape of structure helps the fly ash to adsorb both the dye molecules and the
micro-floc of dye and coagulants (Fig. 6). Big floc can be formed quickly with fly
ash particles as nucleus of the micro-floc. The co-coagulating floc of fly ash-dye
molecule-coagulant has a relatively high density and will precipitate quickly [6,7].
(a) (b)
bsorAency bsorAency
Wavelength, nm Wavelength, nm
FIGURE 4 Spectral analysis of the original and treated dye solution (A: solution before treatment,
B: treated with only coagulant, C: treated with coagulant and fly ash) ((a): Benzo Scarlet 4BS, (b): Brilliant
Acid Scarlet 3R).
0 10 20 30 40 50 600 100 200 300 400
With fly ash
Without fly ash locF olume, vlm
Time, min 0 10 20 30 40 50 60
5
10
15
20
25
30
35
With Fly ash
Without fly ash
loF
c
ov
ul
em
,
lm
Time, min
FIGURE 5 Floc settlement curves.
TREATMENT OF DYEING WASTEWATER 79
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結果 (中文) 1:

在沉淀絮凝体飞灰中的作用记录的絮体沉降与不掺粉煤灰作为共同混凝剂如图 5 所示。结果表明，粉煤灰的加入有助于加快形成和解决的絮状物，减少到少于 5 分钟内稳定的体积。最后采用粉煤灰共凝絮量仅约三分之一，不掺粉煤灰。染料溶液的粉煤灰共同凝血机制粉煤灰包含不规则颗粒含 SiO2、 Al2O3、 Fe2O3，曹等。这种形状的结构有助于粉煤灰吸附两种染料分子和微絮凝的染料和混凝剂 (图 6)。大的絮体可以迅速形成与飞火山灰颗粒作为核心的微絮凝。共同混凝絮凝体的粉煤灰染料分子混凝剂具有相对较高的密度和将快速沉淀 [6，7]。(a) （b）。bsorAency bsorAency波长，毫微米波长 nm图 4 频谱分析的原始和处理染料溶液 （解决办法答 ︰ 治疗前，C: b ︰ 用唯一的混凝剂处理后，处理混凝剂和飞灰） (（a): 苯并大红 4BS、 （b） ︰ 辉煌酸性大红 3R)。0 10 20 30 40 50 600 100 200 300 400飞灰无飞灰 locF 体积，vlm时间，min 0 10 20 30 40 50 605101520253035飞灰不掺粉煤灰loFcovulem, lm时间，分钟图 5 絮体沉降曲线。处理印染废水 79ownlDaded

結果 (中文) 3:

粉煤灰沉淀絮凝作用粉煤灰作为助凝剂如图5所示的絮体沉降记录。它表明，飞灰的加入有助于加速形成和絮凝体的沉降，这是减少到一个稳定的体积在不到5分钟。用粉煤灰混凝絮体的体积只有约三分之一无粉煤灰。粉煤灰对染料混凝机理的研究粉煤灰是由含有SiO2、Al2O3、Fe2O3、CaO等不规则颗粒，这种结构的结构有助于粉煤灰吸附染料分子和染料和混凝剂微絮体（图6）。大絮体可以飞很快形成灰颗粒的微絮体核。共凝絮飞灰染料分子混凝剂具有相对高密度沉淀快[6,7]。（一）（乙）bsoraency bsoraency波长，纳米波长图4原和经处理的染料溶液的光谱分析（一种：在处理前的溶液，B：只有混凝剂，C处理：采用混凝剂和粉煤灰）（（一）：直接大红4BS，（b）：辉煌酸性大红3R）。10 20 30 40 50 600 100 300 200 400 0粉煤灰粉煤灰LOCF容积、VLM时间，10，0，20，30，40，50，60五十十五二十二十五三十三十五粉煤灰粉煤灰LOFCOVULEM，LM时间，分钟图5絮体的沉降曲线。印染废水处理79ownldaded