Removal of Microplastics in a Hybrid Treatment Process of Ceramic Microfiltration and Photocatalyst-Mounted PES Spheres with Air Backwashing.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2024-07-31 DOI:10.3390/membranes14080169
Minjoo Song, Jin Yong Park
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Abstract

Microplastics (MPs), which are defined as plastics with a size of less than 5 mm, cannot be treated completely in wastewater treatment plants (WWTPs) and discharged to a water body because they are too small in size. It has been reported that MPs can have adverse effects on human beings and water ecosystems. There is a need to combine existing drinking water treatment plants (DWTPs) and WWTPs with the traditional treatment process and technology with high removal efficiency of MPs or to develop a new technology to separate MPs from water and wastewater. In this study, the effects of MPs (polyethylene (PE), 125 μm) and organic matter (humic acid) were researched in a hybrid treatment process of ceramic microfiltration (MF) and photocatalyst (TiO2)-mounted polyether sulfone (PES) spheres with air backwashing. The roles of the MF, photooxidation, and adsorption of PES spheres were confirmed in a single MF process (MF), an MF process with UV irradiation (MF+UV), MF and PES sphere adsorption without UV irradiation (MF+PES), and a hybrid process incorporating MF and PES spheres with UV irradiation (MF+PES+UV). The impact of the air backwashing cycle (filtration time, FT) on filtration characteristics and treatment efficiencies in the hybrid process was studied. In the MF process, membrane fouling increased with increasing organic matter (HA, humic acid). The treatment efficiency of MPs increased; however, that of dissolved organic matter (DOM) decreased with increasing HA. As MPs increased, the membrane fouling decreased; however, total filtration volume (VT) remained almost constant. The treatment efficiency of MPs increased a little, and that of DOM showed a dropping trend. In the hybrid process, the membrane fouling was controlled via the adsorption and UV photooxidation of the PES spheres, and the DOM treatment efficiency increased by combining processes from MF to MF+PES+UV. The optimal FT was 10 min at BT 10 s in this hybrid process. The results could be applied to separate MPs effectively in DWTPs/WWTPs.

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在陶瓷微过滤和安装了光催化剂的聚醚砜球与空气反冲洗的混合处理过程中去除微塑料。
微塑料(MPs)是指尺寸小于 5 毫米的塑料,由于尺寸太小,无法在污水处理厂(WWTPs)中完全处理并排放到水体中。据报道,MPs 会对人类和水生态系统造成不利影响。因此,有必要将现有的饮用水处理厂(DWTP)和污水处理厂与传统的处理工艺和技术相结合,以实现对 MPs 的高效去除,或者开发一种新技术,将 MPs 从水和废水中分离出来。本研究研究了陶瓷微滤(MF)和光催化剂(TiO2)安装的聚醚砜(PES)球体与空气反冲洗的混合处理工艺对 MPs(聚乙烯(PE),125 μm)和有机物(腐植酸)的影响。在单一微滤工艺(MF)、带有紫外线照射的微滤工艺(MF+UV)、不带有紫外线照射的微滤和聚醚砜球吸附工艺(MF+PES)以及带有紫外线照射的微滤和聚醚砜球混合工艺(MF+PES+UV)中,确认了微滤、光氧化和聚醚砜球吸附的作用。在混合工艺中,研究了空气反冲洗周期(过滤时间,FT)对过滤特性和处理效率的影响。在 MF 工艺中,膜污垢随着有机物(HA、腐殖酸)的增加而增加。MPs 的处理效率提高了,但溶解有机物(DOM)的处理效率却随着 HA 的增加而降低。随着 MPs 的增加,膜污垢减少;但总过滤量(VT)几乎保持不变。MPs 的处理效率略有提高,而 DOM 的处理效率呈下降趋势。在混合工艺中,通过 PES 球体的吸附和紫外光氧化作用控制了膜污垢,并通过从 MF 到 MF+PES+UV 的组合工艺提高了 DOM 的处理效率。在这种混合工艺中,最佳的 FT 为 10 分钟,BT 为 10 秒。该结果可用于有效分离污水处理厂/污水处理厂中的 MPs。
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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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