| Autor: |
Halfhide, Trina, Dalrymple, Omatoyo, Wilkie, Ann, Trimmer, John, Gillie, Benjamin, Udom, Innocent, Zhang, Qiong, Ergas, Sarina |
| Předmět: |
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| Zdroj: |
BioEnergy Research; Mar2015, Vol. 8 Issue 1, p249-258, 10p |
| Abstrakt: |
Centrate from dewatering anaerobically digested municipal sludge is a particular concern in wastewater treatment, as it contains high ammonia concentrations and is often recycled to the head of the plant, reducing efficiency. Algae have the potential to remove ammonia from this wastewater, while producing biomass that can be used as an energy feedstock. In this research, an indigenous algal consortium was cultivated on municipal sludge centrate in a semi-continuous photobioreactor under natural light conditions. The goals of this research were to (1) enrich an algal consortium capable of growth on sludge centrate; (2) determine the main species of the consortium;(3) measure biomass, lipid production, and nutrient removal rates; and (4) develop a simple model to describe the system. The results suggested that Chlorella sp. was the dominant species (95 %) in the consortium. Mean biomass productivity was 5.2 g m day, which was relatively high compared with other studies carried out with high ammonia strength wastewaters. Lipid production was low, comprising only 10 % of total biomass. The algal consortium effectively removed nutrients from the centrate, with observed mean removal efficiencies for total nitrogen, total phosphorus, and chemical oxygen demand of 65, 72, and 8 %, respectively. A simple irradiance-based model was developed from the fundamental Michaelis-Menten photosynthesis-irradiance (PI) response for photosynthetic organisms. A good fit to the experimental data was obtained with the irradiance-based model ( R = 0.96), indicating that the system was light limited. The results show that biomass production can be predicted based on irradiance only. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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