AI Article Synopsis
- - The papermaking industry produces a lot of wastewater and gas that’s hard to treat due to the need for extra chemicals and high energy use.
- - A new zero liquid discharge system (NF-BMED-MC) combines techniques like nanofiltration and electrodialysis to recover valuable resources from this waste, such as NaCl and fresh water, without adding extra chemicals.
- - This integrated system not only reduces scaling on membranes and captures CO, but also allows for effective wastewater reclamation, making it a sustainable alternative for managing papermaking industry waste.
Article Abstract
Papermaking industry discharges large quantities of wastewater and waste gas, whose treatment is limited by extra chemicals requirements, insufficient resource recovery and high energy consumption. Herein, a chemical self-sufficiency zero liquid discharge (ZLD) system, which integrates nanofiltration, bipolar membrane electrodialysis and membrane contactor (NF-BMED-MC), is designed for the resource recovery from wastewater and waste gas. The key features of this system include: 1) recovery of NaCl from pretreated papermaking wastewater by NF, 2) HCl/NaOH generation and fresh water recovery by BMED, and 3) CO capture and NaOH/NaCO generation by MC. This integrated system shows great synergy. By precipitating hardness ions in papermaking wastewater and NF concentrate with NaOH/NaCO, the inorganic scaling on NF membrane is mitigated. Moreover, the NF-BMED-MC system with high stability can simultaneously achieve efficient CO removal and sustainable recovery of fresh water and high-purity resources (NaCl, NaSO, NaOH and HCl) from wastewater and waste gas without introducing any extra chemicals. The environmental evaluation indicates the carbon-neutral papermaking wastewater reclamation can be achieved through the application of NF-BMED-MC system. This study establishes the promising of NF-BMED-MC as a sustainable alternative to current membrane methods for ZLD of papermaking industry discharges treatment.
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| http://dx.doi.org/10.1016/j.watres.2022.119451 | DOI Listing |
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