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Hybrid algal photosynthesis and ion exchange (HAPIX) process for high ammonium strength wastewater treatment.

08:00 EDT 25th May 2018 | BioPortfolio

Summary of "Hybrid algal photosynthesis and ion exchange (HAPIX) process for high ammonium strength wastewater treatment."

A hybrid algal photosynthesis and ion exchange (HAPIX) process was developed that uses natural zeolite (chabazite) and wild type algae to treat high ammonium (NH) strength wastewater. In the HAPIX process, NH is temporarily adsorbed from the liquid, which reduces the free ammonia (FA) concentration below the inhibitory level for algal growth. The slow release of adsorbed NH subsequently supports the continuous growth of algae. In this study, a HAPIX reactor reduced NH-N concentrations in centrate from an anaerobic digester from 1180 mg L to below 10 mg L without dilution. Chabazite doses of 60 g L produced more algal biomass, with higher protein and starch contents, than doses of 150 g L and 250 g L. Approximately 67-70% of fatty acids in the algal biomass harvested from HAPIX reactors were unsaturated. A mathematical framework that couples a homogeneous surface diffusion model with a co-limitation algal kinetic growth model reasonably predicted the algal biomass production and NH-N concentrations in the HAPIX reactors. The HAPIX process has the potential to serve a two-fold purpose of high NH-N strength wastewater treatment and agricultural or commercial biopolymer production.

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This article was published in the following journal.

Name: Water research
ISSN: 1879-2448
Pages: 65-74

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