Year: 2011
Type: dissertation
Abstract: ALDIGA, short for “Algae from Waste for Combined Biodiesel and Biogas Pro-duction”, aims to develop a concept for a closed circulation of resources in pro-ducing biodiesel and biogas from waste. The project is realized in co-operation between VTT, University of Helsinki, Lahti and Häme Universities of Applied Sciences, SYKE and funded by Tekes. \n \nThe project’s first work phase ergo this bachelor’s thesis covered the mapping of available and suitable streams to be used in the cultivation of algae. These streams included municipal and agricultural sewages, food industry’s process waters, land-fill leachates, cooling waters, reject waters, fish farming water and press water from municipal organic waste. In order to choose one or several streams to be used in the project, a spreadsheet tool was built to assist in the comparison of the properties of different streams. The tool features a selection of the streams’ pa-rameters and the capability to track the original source of information along the provided links. Several sources were used to gather the information on the waste streams and they ranged from analyses produced for the companies themselves to scientific articles and taking and analyzing samples personally. \n \nFrom the highly concentrated streams, reject water contained the most nutrients (5150 mg/l of nitrogen and 555 mg/l of phosphorus). Organic press water con-tained 3069 mg/l of nitrogen and 39 mg/l of phosphorus. Distillery effluent con-tained 2020 mg/l of nitrogen and both lacked phosphorus compared to reject water (<250mg/l of phosphorus). Swine manure sewage contained 569 mg/l of nitrogen and 441 mg/l of phosphorus. Distillery effluents were by far the richest in oxygen demand (36000 mg/l BOD7 and 113000 mg/l CODCr before methanation and 4000 mg/l BOD7 and 39000 mg/l CODCr after methanation). The total solid concentration in organic press water was 93000 mg/l. Distillery effluents contained total solids 98000 mg/l before methanation and 43000 mg/l after methanation. Some of the dilute streams, municipal waste water, leachate, cooling water, pasta and flour plant effluent, paper production effluent, carpet production effluent and fish farming water are suitable for diluting the high potential streams, or they can probably be used solely if a sufficient source is available nearby.
Source: Theseus (Ammattikorkeakoulujen)
Author: Antti Kautto
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: green
Funders: Helsingin Yliopisto, Tekes
OpenAlex ID: W315456234