Nitrate removal from contaminated groundwater by micellar-enhanced ultrafiltration using a polyacrylonitrile membrane with a hydrogel-stabilized ZIF-L layer

Akshay Modi, Roni Kasher

Research output: Contribution to journalArticlepeer-review

Abstract

Contamination of groundwater by nitrate from intensive agriculture is a serious problem globally. Excessive fertilization has led to nitrate contamination of the Coastal Aquifer in Israel. Here we report the efficient removal of nitrate from contaminated groundwater by micellar-enhanced ultrafiltration (MEUF) using a specially tailored membrane. Graft polymerization with hydrophilic poly(methacrylate) and incorporation of porous zeolitic imidazole framework ZIF-L nanoparticles imparted antifouling properties to the membrane. The resulting modified membrane showed high water permeance (82.2 ± 1.7 L·m−2·h−1·bar−1). The efficiency of nitrate removal by MEUF was tested using cetylpyridinium chloride as a surfactant in nitrate-contaminated groundwater collected from the Coastal Aquifer of Israel. The membrane reduced nitrate levels from 40–70 to levels of 6.8–29.5 mg·L−1, depending on the groundwater composition; further reduction to 6.1–24.1 mg·L−1 with complete surfactant rejection was achieved via two-stage membrane filtration, which showed high permeate flux (between 32.1 ± 0.9 and 45.9 ± 0.6 L·m−2·h−1) at 2 bar. The membrane maintained stable separation performance during multiple cycles, and the flux recovery ratio was >93 %. Nitrate concentrations fell well below the acceptable limit for drinking water, allowing the treated water to be used without restriction. Overall, the membrane has the potential to allow efficient removal by MEUF of nitrate from contaminated groundwater.

Original languageEnglish
Article number121384
JournalWater Research
Volume254
DOIs
StatePublished - 1 May 2024

Keywords

  • Groundwater remediation
  • Israel coastal aquifer
  • MOF
  • Metal organic frameworks
  • Methacrylate hydrogel
  • Micellar-enhanced ultrafiltration
  • Nitrate removal
  • Polyacrylonitrile membrane
  • ZIF-L nanoparticle

ASJC Scopus subject areas

  • Water Science and Technology
  • Ecological Modeling
  • Pollution
  • Waste Management and Disposal
  • Environmental Engineering
  • Civil and Structural Engineering

Fingerprint

Dive into the research topics of 'Nitrate removal from contaminated groundwater by micellar-enhanced ultrafiltration using a polyacrylonitrile membrane with a hydrogel-stabilized ZIF-L layer'. Together they form a unique fingerprint.

Cite this