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- Desa, L., et al.
(författare)
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Improving and upgrading an existing activated sludge with a compact MBBR - disc filters parallel line for municipal wastewater treatment in touristic alpine areas.
- 2020
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Ingår i: Water Practice and Technology. - : IWA Publishing. - 1751-231X. ; 15:2, s. 515-527
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Tidskriftsartikel (refereegranskat)abstract
- Many wastewater treatment plants (WWTP) in touristic areas struggle to achieve the effluent requirements due to seasonal variations in population. In alpine areas, the climate also determines a low wastewater temperature, which implies long sludge retention time (SRT) needed for the growth of nitrifying biomass in conventional activated sludge (CAS). Moreover, combined sewers generate high flow and dilution. The present study shows how the treatment efficiency of an existing CAS plant with tertiary treatment can be upgraded by adding a compact line in parallel, consisting of a Moving Bed Biofilm Reactor (MBBR)-coagulation-flocculation-disc filtration. This allows the treatment of influent variations in the MBBR and a constant flow supply to the activated sludge. The performance of the new 2-step process was comparable to that of the improved existing one. Regardless significant variations in flow (10,000-25,000 m(3)/d) and total suspended solids (TSS) (50-300 mg/L after primary treatment) the effluent qualityfulfilled the discharge requirements. Based on yearly average effluent data, TSS were 11 mg/L, chemical oxygen demand (COD) 27 mg/L and total phosphorus (TP) 0.8 mg/L. After the upgrade, ammonium nitrogen (NH4-N) dropped from 4.9 mg/L to 1.3 mg/L and the chemical consumption for phosphorus removal was reduced.
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| 2. |
- Haiba, E., et al.
(författare)
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Reovee järelpuhastus
- 2023
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Ingår i: Reoveepuhastuse käsiraamat. - Tallinn. ; , s. 434-461
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Kangsepp, P., et al.
(författare)
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Filter-based treatment of leachate from an industrial landfill containing shredder residues of end-of-life vehicles and white goods
- 2010
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Ingår i: Waste Management. - : Elsevier. - 0956-053X .- 1879-2456. ; 30:2, s. 236-245
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Tidskriftsartikel (refereegranskat)abstract
- A pilot plant was set up to treat leachate from an industrial landfill containing shredder residues of end-of-life vehicles and white goods. The treatment plant consisted of aeration and sedimentation steps for pre-treatment, and a filter. The plant was designed to simultaneously remove various types of pollutants. The efficiencies of pre-treatment and of the main treatment step were investigated over a period of 3 years at the landfill site. By continuous aeration of the leachate the concentrations of Fe and Mn were reduced by 55% and 49%, respectively. By prolonged sedimentation suspended solid content was noticeably reduced (72%). in the filter, consisting of a mixture of peat and carbon-containing ash as a treatment medium, very high reduction of polar organic compounds, e.g. phenol (74%), o-and p-cresol (91%), and 2,4-dimethylphenol (73%), high average reduction of metals, e.g. Pb (78%), Fe (74%), Cu (73%), Mn (56%), Sn (55%), and Zn (47%), and good average reduction of DOC (26%), Tot-N (23%) and NH4-N (46%) were achieved. Sixty non-polar compounds in the leachate, identified by GC-MS screening, occurred at trace level. Most of them were considerably reduced in the filter.
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| 10. |
- Kängsepp, Pille, et al.
(författare)
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Column studies aiming at identification of suitable filter materials for pollutant removal from landfill leachate
- 2008
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Ingår i: International Journal of Environment and Waste Management. - 1478-9876 .- 1478-9868. ; 2:6, s. 506-525
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Tidskriftsartikel (refereegranskat)abstract
- Landfill leachate contains a complex mixture of inorganic and organic pollutants, which need to be removed before they pollute the environment. Different filter media (peat mixed with either carbon-containing ash, polyurethane waste, or wood pellets) were investigated with respect to their possibility to simultaneously and at low initial concentrations remove metals, polar and non-polar organic compounds. The mixture of peat and carbon-containing ash was found to be the best medium. Reduction in leachate of phenolic substances was 96%, of PBDEs was over 98%, of DOC 40% and of important metals as Cu, Pb and Sn 60%, 90% and 93%, respectively.
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