Application of membrane separation technology in the treatment of leachate in China: A review

Chen, Wei-Ming; Gu, Zhepei; Ran, Gang; Li, Qibin

doi:10.1016/j.wasman.2020.12.002

Cited by 145 publications

(40 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Leachate treatment includes biological processes, membrane separation methods, and advanced oxidation processes (Chen, Gu, et al, 2021;Ittisupornrat et al, 2021;Wu, Chen, et al, 2021). Among these methods, biological processes are most frequently adopted because of their stability and relatively low cost (Kurniawan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Microbial community response of the full‐scale MBR system for mixed leachates treatment

Song

et al. 2022

Water Environment Research

Self Cite

View full text Add to dashboard Cite

In practice, mature landfill leachate and incineration (young) leachate are mixed to improve the biodegradability and enhance biological treatment performance. However, the ratio of mature‐to‐young leachates greatly influences MBR treatment efficiency and microbial community structure. This study investigated the treatment efficiency and microbial community structure of full‐scale MBR systems operated under two mix ratios, mature leachate: young leachate = 7:3 (v/v, denoted as LL) and 3:7 (v/v, denoted as IL). LL group showed lower Cl− and COD concentrations but a higher aromatic organic content comparing to IL group, and the COD and UV254 removals for LL were significantly lower than those for IL by MBR treatment. Microbial community structures were similar in both groups at phylum level, with dominant phyla being Proteobacteria (23.8%–32.3%), Bacteroidetes (15.25%–20.7%), Chloroflexi (10.5%–23.1%), and Patescibacteria (9.9%–13.2%). However, the richness and diversity of LL group were lower, and differences were observed at lower taxonomy levels. Results indicated that salinity mainly changed the structure of microbial community, resulting in greater abundance of salt‐tolerant microbials, while refractory organics affected microbial community structure, and also led to decreased diversity and metabolic activity. Therefore, in mixed leachates biological treatment, a higher young leachate ratio is recommended for better organics removal performance. Practitioner Points The trade‐off between refractory organics and salinity in mixed leachate treatment should be paid attention. Refractory organics reduced alpha and functional diversities of microorganisms. Mixed leachate with a higher young leachate ratio reached a better organic removal.

show abstract

Section: Introductionmentioning

confidence: 99%

Microbial community response of the full‐scale MBR system for mixed leachates treatment

Song

et al. 2022

Water Environment Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…So far, membrane processes have been widely used in seawater desalination, 1,2 gas purification, 3,4 CO 2 capture, 5,6 food industry, 7 and other fields. [8][9][10] Membrane material is the core of membrane technology, and directly decides the process performance and service environment. At present, most of commercial membrane products are fabricated with organic polymer materials such as polysulfone (PSF), polyethersulfone (PES), polyvinyl chloride (PVC), polyamide (PA), polyimide (PI), polypropylene (PP), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE), and so forth.…”

Section: Abstract Membranes Separation Techniques 1 | Introductionmentioning

confidence: 99%

Study on two‐stage stretching strategy for microstructure improvement of polytetrafluoroethylene hollow fiber membrane

Jia

Zhou

Liu

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polytetrafluoroethylene (PTFE) has excellent chemical resistance, thermal stability as well as hydrophobicity, and is regarded as a good material for membrane fabrication. PTFE hollow fiber membrane is commonly prepared by the paste extrusion–stretching–sintering process, where the stretching temperature is usually fixed in existing reports. In this paper, a new two‐stage stretching method (first at 50°C and then at 200°C) was proposed to optimize the microstructure of PTFE hollow fiber membranes. Meanwhile, the stretching experiments at low‐temperature (50°C) and high‐temperature (200°C) were also conducted for comparison. The chemical composition, surface morphology, surface porosity, overall porosity, maximum pore size, water contact angle, and mechanical property were discussed. Moreover, the ethanol permeation flux and bovine serum albumin (BSA) rejection of PTFE hollow fiber membranes prepared from different stretching manners were tested. The results showed that with the increase of stretching ratio, the porosity, and pore size gradually increased for all three membranes. However, for a specific stretching ratio, the membrane fabricated by two‐stage stretching process exhibited better comprehensive properties in terms of porosity and pore size, that is, higher porosity than the 50°C method and smaller pore size than the 200°C method. As stretching ratio was 2.0, the ethanol permeation flux and BSA rejection was 2467 L/m2 h and 95%, respectively. Overall, the PTFE hollow fiber prepared from “two‐stage” stretching exhibited comparable BSA rejection (both around 95%) and much higher permeation flux (increased by 43.1%) compared to the sample prepared by low‐temperature stretching at 50°C, and meanwhile, comparable permeation flux (decreased by 10.8%) and higher BSA rejection (95% against 81%) compared to the sample prepared by high‐temperature stretching at 200°C. The proposed method provided a good reference for the microstructure improvement of PTFE hollow fiber membrane fabricated by paste extrusion–stretching–sintering technology.

show abstract

“…Water shortage and water pollution significantly hinder sustainable development, which is one of the greatest challenges facing humanity in the 21st century. Nanofiltration is a typical pressure-driven membrane-separation process that can treat secondary treated sewage, drinking water, and leachate [1][2][3][4]. Due to the significant improvement of nanofiltration membrane-separation performance and the reduction of operational costs, nanofiltration is widely used to meet the increasing demand of fresh water and strict standards of sewage discharge [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study of Turbulence Promoters in Prolonging Membrane Life

Jiang

Yang

et al. 2021

Membranes

View full text Add to dashboard Cite

Nanofiltration membrane technology is an effective method for secondary treated sewage purification. However, membrane fouling, which is inevitable in the membrane-separation process, can reduce membrane performance and shorten membrane life. Installing a turbulence promoter is a promising means of improving the hydraulic conditions inside the membrane chamber. In this study, the effect of turbulence promoter on prolonging membrane life was studied for the first time. Flat-sheet polyethersulfone nanofiltration membrane was used to filter humic acid solution, used for simulating secondary treated sewage. By comparing photographs and SEM images of the membrane before and after the simulated secondary treated sewage filtration, it was found that humic acid tended to be deposited on the low-velocity region, which was reflected by COMSOL simulation. After incorporating a turbulence promoter, the reduction of the humic acid deposition area and membrane fouling resistance indicated that the turbulence promoter could reduce membrane fouling due to the improved hydraulic conditions. Additionally, the turbulence promoter also increased the flux and reduced the flux decay rate. The turbulence promoter was then place in the crossflow flat-sheet membrane filtration module, and the variation of flux with time was tested in simulated secondary treated sewage with different concentrations. The results showed that the membrane life for the filtration of simulated secondary treated sewage comprising 50, 250, and 500 ppm humic acid increased by 23.1%, 80.4%, and 85.7%, respectively. The results of this article can serve as a reference for the prediction of membrane life and the performance enhancement mechanism of membranes containing a turbulence promoter.

show abstract

Application of membrane separation technology in the treatment of leachate in China: A review

Cited by 145 publications

References 71 publications

Microbial community response of the full‐scale MBR system for mixed leachates treatment

Microbial community response of the full‐scale MBR system for mixed leachates treatment

Study on two‐stage stretching strategy for microstructure improvement of polytetrafluoroethylene hollow fiber membrane

Study of Turbulence Promoters in Prolonging Membrane Life

Contact Info

Product

Resources

About