Performance and operating experiences of the first Scandinavian full-scale Discfilter installation for tertiary phosphorus polishing with preceding coagulation and flocculation

Kängsepp, P.; Väänänen, Janne; Örning, K.; Sjölin, Mikael; Olsson, Per‐Erik; Rönnberg, J.; Wallebäck, F.; Cimbritz, Michael; Pellicer-Nàcher, Carles

doi:10.2166/wpt.2016.040

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…50 to 70% of TSS (mg/L) remaining after PST can be removed if the MS mesh size is selected between 15 and 4 µm. In contrast, studies conducted by Remy et al, Köngsepp et al, and Vaananen et al [41][42][43] mainly observed the removal of solids from raw wastewater using drum or disc filters, with mesh sizes predominantly ranging from 100 to 400 µm but with the help of chemicals such as ferric chloride and aluminum chloride or sulfate. However, the idea of coupling a PST with an MS in order to extract a higher amount of POC (mg/L) out of municipal WWTPs without any chemical addition is being introduced for the first time in this study.…”

Section: Solids Distribution In the Effluent Of Pstmentioning

confidence: 96%

A Fundamental Study on the Extraction of Particulate Organic Carbon from Municipal Wastewater Treatment Plants

Lasaki

Maurer

Schönberger

2023

Water

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In line with the strategy of transforming existing municipal wastewater treatment plants (WWTP) from disposal facilities into systems for using domestic wastewater (WW) as a source of energy and raw materials, a concept consisting of chemical, physical, and biological steps has been set up as a pilot project in WWTP Büsnau, Stuttgart, Germany. The key part of the entire process is based on the use of advanced microsieving (MS) to eliminate remaining particulate organic carbon (POC) (mg/L) from the effluent of the primary sedimentation tank (PST). Therefore, in the primary stages of this project, it was necessary to have a broad vision and a true understanding of the particle size distribution (PSD) of municipal WW. As a novel approach, in the present study, the conventional PSD method was optimized by implementing certain modifications, and the tests were conducted in situ. The modified PSD analyses facilitated in-depth investigations of solid–liquid separation at WWTPs and showed that drying samples in the oven can result in a 20% to 30% deviation in the POC (mg/L) removal results. In addition, the idea of the substitution of PSTs with an MS was supported by the results of this study. It was determined that an MS with a pore size of 45 µm to 63 µm can provide the same elimination efficiency as a PST. Another significant outcome of this study was the introduction of suitable mesh sizes for the MS which were coupled with PST in order to extract the maximum amount of POC (mg/L) from the municipal WWTPs without the addition of any chemicals. The results revealed that up to 90% of the TSS (mg/L) and 70% of the COD (mg/L) can be removed if an MS with a mesh size between 4 µm and 20 µm is coupled with a PST.

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Section: Solids Distribution In the Effluent Of Pstmentioning

confidence: 96%

A Fundamental Study on the Extraction of Particulate Organic Carbon from Municipal Wastewater Treatment Plants

Lasaki

Maurer

Schönberger

2023

Water

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“…Among the biofilm separation methods, microscreens maximize the process compactness (Ødegaard et al 2010). Although the TSS separation by microscreens with woven media has been studied for a decade (Persson et al 2006;Mattsson et al 2009;Rossi et al 2013), chemical pre-treatment is a more recent development (Kängsepp et al 2016;Väänänen et al 2016;Langer et al 2017). Coagulation and flocculation before disc filters allow TSS and phosphorus removal above 90%, while keeping a high filtration flux and having limited footprint requirements.…”

Section: Introductionmentioning

confidence: 99%

Improving and upgrading an existing activated sludge with a compact MBBR – disc filters parallel line for municipal wastewater treatment in touristic alpine areas

Desa¹,

Kängsepp

Quadri³

et al. 2020

Water Practice and Technology

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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 m3/d) and total suspended solids (TSS) (50–300 mg/L after primary treatment) the effluent quality fulfilled 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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A comparison of aerobic granular sludge with conventional and compact biological treatment technologies

Bengtsson

Blois²,

Wilén

et al. 2018

Environmental Technology

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The aerobic granular sludge (AGS) technology is growing towards becoming a mature option for new municipal wastewater treatment plants and capacity extensions. A process based on AGS was compared to conventional activated sludge processes (with and without enhanced biological phosphorus removal), an integrated fixed-film activated sludge (IFAS) process and a membrane bioreactor (MBR) by estimating the land area demand (footprint), electricity demand and chemicals' consumption. The process alternatives compared included pre-settling, sludge digestion and necessary post-treatment to achieve effluent concentrations of 8 mg/L nitrogen and 0.2 mg/L phosphorus at 7°C. The alternative based on AGS was estimated to have a 40-50% smaller footprint and 23% less electricity requirement than conventional activated sludge. In relation to the other compact treatment options IFAS and MBR, the AGS process had an estimated electricity usage that was 35-70% lower. This suggests a favourable potential for processes based on AGS although more available experience of AGS operation and performance at full scale is desired.

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Performance and operating experiences of the first Scandinavian full-scale Discfilter installation for tertiary phosphorus polishing with preceding coagulation and flocculation

Cited by 7 publications

References 6 publications

A Fundamental Study on the Extraction of Particulate Organic Carbon from Municipal Wastewater Treatment Plants

A Fundamental Study on the Extraction of Particulate Organic Carbon from Municipal Wastewater Treatment Plants

Improving and upgrading an existing activated sludge with a compact MBBR – disc filters parallel line for municipal wastewater treatment in touristic alpine areas

A comparison of aerobic granular sludge with conventional and compact biological treatment technologies

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