Pretreatment for water reuse using fluidized bed crystallization
Pretreatment for water reuse using fluidized bed crystallization
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DOI：
10.1016/j.jwpe.2020.101226
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发表时间：
2020-06-01
影响因子：
7
通讯作者：
Farrell, James
中科院分区：
文献类型：
--
作者：
AzadiAghdam, Mojtaba;Park, Minkyu;Farrell, James
采用流态化结晶法去除城市污水回用前的结垢物质和天然有机物(NOM)。研究了pH值对沸腾结晶器(FBCR)中Ca~(2+)、Mg~(2+)、SiO_2和NOM去除的影响。并与常规处理、超滤、三氯化铁混凝/混凝处理进行了比较。在优化条件下，沸腾床结晶能去除99.9%以上的镁离子、97%的钙离子和42%的二氧化硅。FBCR也能去除25%的NOM，介于三氯化铁去除NOM(56%)和超滤(13%)之间。尺寸排除色谱-有机碳检测(SEC-OCD)表明，大部分NOM的去除是通过与氢氧化镁(2)共沉淀的方式进行的。用激发发射矩阵-平行因子(EEM-PARAFAC)分析研究了去除的NOM的类型。FBCR能够去除所有5种NOM组分(3种腐植酸、1种黄腐酸和1种类蛋白质物质)，包括100%的原生黄腐酸。三氯化铁也能去除所有五种NOM组分，但只去除三分之一的固有黄腐酸，而超滤法只能去除11%的蛋白质样NOM。
This research investigated the use of fluidized bed crystallization for removing scale forming species and natural organic matter (NOM) from treated municipal wastewater prior to water reclamation. The effect of pH on Ca2+, Mg2+, silica and NOM removal in a fluidized bed crystallization reactor (FBCR) was determined. NOM removal in the FBCR was compared to that for the conventional treatments, ultrafiltration and ferric chloride coagulation/flocculation. Under optimized conditions, fluidized bed crystallization was able to remove more than 99.9 % of Mg2+, 97 % of Ca2+ and 42 % of silica. The FBCR was also able to remove 25 % of NOM, which was intermediate between NOM removal by ferric chloride (56 %) and ultrafiltration (13 %). Size exclusion chromatography-organic carbon detection (SEC-OCD) indicated that the majority of NOM removal occurred via co-precipitation with Mg(OH)(2). Excitation emission matrix-parallel factor (EEM-PARAFAC) analysis was used to investigate the types of NOM removed. The FBCR was able to remove all five NOM components (three humic acids, one fulvic acid and one protein-like substance), including 100 % of the autochthonous fulvic acids. Ferric chloride was also able to remove all five NOM components, but only one third of the autochthonous fulvic acids, while ultrafiltration was able to remove only 11 % of the protein-like NOM.