Abstract
In this lab-scale study, domestic wastewater is subjected to a chemical biological adsorption (A-stage), followed by treatment in an innovative roof installed parallel plate microalgae biofilm reactor for nutrient immobilization (I-stage). The A-stage process was operated at a hydraulic retention time (HRT) of 1h and a solid retention time of 1day (FeSO4 as flocculant). The I-stage, which consequently received the effluent of the A-stage process, was operated at an HRT of 1day and exposed to natural light. The overall system removed on average 74% of the total chemical oxygen demand, 82% of the total suspended solids, 67% of the total nitrogen and 96% of the total phosphorous in the wastewater. The design involves a relatively low capital and operating cost which is in the order of 0.5€/m3 wastewater treated. These aspects suggest that the A/I process can be used as a decentralized domestic wastewater treatment system.
Original language | English (US) |
---|---|
Pages (from-to) | 152-160 |
Number of pages | 9 |
Journal | Bioresource Technology |
Volume | 130 |
DOIs | |
State | Published - Feb 2013 |
Keywords
- Algae
- Green roofs
- Municipal wastewater
- Nutrient recovery
- Photobioreactor