Long term experience with the nutrient limited BAS process for treatment of forest industry wastewaters

2007 ◽  
Vol 55 (6) ◽  
pp. 89-97 ◽  
Author(s):  
Å. Malmqvist ◽  
T. Welander ◽  
L.E. Olsson
Keyword(s):  
Biological Treatment ◽  
Operating Mode ◽  
Full Scale ◽  
Forest Industry ◽  
Process Stability ◽  
Sludge Characteristics ◽  
Long Term Treatment ◽  
Different Types ◽  
Sludge Production

The nutrient limited biofilm-activated sludge (BAS) process was developed with the aim to ensure maximum biological treatment efficiency in combination with good process stability, low sludge production and minimum effluent concentration of nutrients. The first full scale nutrient limited BAS (NLBAS) processes were implemented at Södra Cell Värö and Stora Enso Hylte in 2002. Since then another three full scale installations have been built. The aim of this study was to investigate and summarise the long-term treatment results, process stability, sludge production and sludge characteristics for the five full scale NLBAS processes. It was of particular interest to compare the nutrient limited operating mode with regard to the different types of production and wastewater that the mills represent (kraft, TMP and newsprint, bleached CTMP). The study showed that after the initial start-up period, which varied from a couple of weeks to three to four months, all plants meet their respective discharge limits. The sludge production for the different plants varies between 0.07 and 0.15 kg TSS/kg COD and the sludge characteristics are with few exceptions excellent. In conclusion, the nutrient limited BAS process is suitable for both upgrades and new installations of biological treatment for different types of forest industry wastewaters.

Lessons learnt from evaluating full-scale ammonium feedback control in three large wastewater treatment plants

2014 ◽  
Vol 69 (7) ◽  
pp. 1573-1580 ◽  
Author(s):  
L. Åmand ◽  
C. Laurell ◽  
K. Stark-Fujii ◽  
A. Thunberg ◽  
B. Carlsson
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Control Strategies ◽  
Full Scale ◽  
Feedback Controllers ◽  
Energy Assessment ◽  
Different Types ◽  
Term Evaluation ◽  
Save Energy

Three large wastewater treatment plants in Sweden participate in a project evaluating different types of ammonium feedback controllers in full-scale operation. The goal is to improve process monitoring, maintain effluent water quality and save energy. The paper presents the outcome of the long-term evaluation of controllers. Based on the experiences gained from the full-scale implementations, a discussion is provided about energy assessment for the purpose of comparing control strategies. The most important conclusions are the importance of long-term experiments and the difficulty of comparing energy consumption based on air flow rate measurements.

First full-scale combined MBBR, coagulation, flocculation, Discfilter plant with phosphorus removal in France

2019 ◽  
Vol 15 (1) ◽  
pp. 19-27 ◽  
Author(s):  
P. Kängsepp ◽  
M. Sjölin ◽  
A. G. Mutlu ◽  
B. Teil ◽  
C. Pellicer-Nàcher
Keyword(s):  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Biological Treatment ◽  
Suspended Solids ◽  
Full Scale ◽  
Small Scale ◽  
Dissolved Air Flotation ◽  
Biofilm Reactors ◽  
Dissolved Air

Abstract The suspended solids (SS) concentrations in effluent from moving bed biofilm reactors (MBBRs) used for secondary biological treatment can be up to 500 mg/L. Microscreens (Drumfilters or Discfilters) can be used as alternatives to traditional clarification or dissolved air flotation to remove SS and total phosphorus (TP). This study shows how a small-scale municipal WWTP for 5,700 population equivalent (PE) can be upgraded to 12,000 PE by combining MBBR with coagulation-flocculation tanks and a Discfilter with a total footprint of 160 m2. This long-term investigation demonstrated that even though influent turbidity (range 146–431 NTU) and flow (25–125 m3/h) varied considerably, very low effluent turbidities (below 10 NTU) could be achieved continuously. Furthermore, this compact treatment system can provide average reductions of ammonium (NH4-N) from 19 to 0.04 mg/L, COD from 290 to 10 mg/L, and TP from 4.5 to 0.3 mg/L. The results show that effluent requirements can be reached by combining MBBR, coagulation-flocculation and disc filtration at full scale, without a primary clarifier upstream of MBBR.

The effect of flow equalisation and prefermentation on the sludge production and sludge characteristics in a BNR plant

2008 ◽  
Vol 57 (12) ◽  
pp. 2023-2029 ◽  
Author(s):  
A. Mikola ◽  
J. Rautiainen ◽  
H. Kiuru
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Biological Process ◽  
Diurnal Variations ◽  
Full Scale ◽  
Waste Activated Sludge ◽  
Sludge Characteristics ◽  
Stable Conditions ◽  
Sludge Production ◽  
Sludge Concentration

A full-scale study investigated the influence of diurnal flow equalisation and prefermentation on the characteristics of sludge. The diurnal variations in the sludge concentration and the level of sludge blanket in the secondary clarifiers were evened out significantly with the use of an equalization basin. Stable conditions in the aeration basin and in the secondary clarifiers contributed to the improvements in the performance of the BNR plant. A decrease in the waste activated sludge production and an improvement in the settleability were also observed. The low WAS yield was attributed to the low yield COD compounds produced by the prefermentation, longer sludge age and constant conditions obtained by the flow equalisation. Some evidence was found that good settling properties would be related to the amount of suspended solids fed to the biological process as well as to the good performance of the biological process.

scholarly journals Scaling-Up and Long-Term Operation of a Full-Scale Two-Stage Partial Nitritation-Anammox System Treating Landfill Leachate

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 800
Author(s):  
Albert Magrí ◽  
Maël Ruscalleda ◽  
Albert Vilà ◽  
Tiago R. V. Akaboci ◽  
M. Dolors Balaguer ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Research Group ◽  
Biological Treatment ◽  
Scale Up ◽  
Full Scale ◽  
Landfill Site ◽  
Two Stage ◽  
Partial Nitritation ◽  
N Removal

(1) Background: Biological treatment of leachate in landfill sites using anaerobic ammonium oxidation (anammox) is challenging because of the intrinsic characteristics of this complex wastewater. In this work, the scale-up and subsequent full-scale implementation of the PANAMMOX® technology (LEQUIA Research Group, Girona, Catalonia, Spain) are presented as a case study to achieve long-term nitrogen (N) removal from mature leachate mostly through a completely autotrophic pathway. (2) Methods: The treatment system consists of two sequencing batch reactors (SBRs) running in series to individually operate partial nitritation (PN) and anammox (A). Following biological treatment, physicochemical oxidation (i.e., Fenton-based process) was used to remove the remaining non-biodegradable organic matter. A cost analysis comparative was conducted in relation to the former technology used on-site for treating the leachate. (3) Results: The scale-up of the process from pilot- to full-scale was successfully achieved, finally reaching an average removal of 7.4 kg N/d. The composition of the leachate changed over time, but especially once the landfill site stopped receiving solid waste (this fact involved a marked increase in the strength of the leachate). The adjustment of the alkalinity-to-ammonium ratio before feeding PN-SBR helped to improve the N-removal efficiency. Values of conductivity above 25 mS/cm in A-SBR could negatively affect the performance of the anammox process, making it necessary to consider a dilution strategy according to the on-line monitoring of this parameter. The analysis of the operational costs showed that by implementing the PANAMMOX® technology (LEQUIA Research Group, Girona, Catalonia, Spain) in the landfill site, savings up to 32% were achievable. (4) Conclusions: Treatment of mature landfill leachate in such a two-stage PN-A system was demonstrated as feasible and economically appealing despite the complexity of this industrial wastewater. Accurate expert supervision of the process was a key factor to reaching good performances.

Sludge reduction in a small wastewater treatment plant by electro-kinetic disintegration

2015 ◽  
Vol 72 (3) ◽  
pp. 364-370 ◽  
Author(s):  
Agostina Chiavola ◽  
Alessandra Ridolfi ◽  
Emilio D'Amato ◽  
Simona Bongirolami ◽  
Ennio Cima ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Flow Rate ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Sludge Reduction ◽  
Treatment Efficiency ◽  
Biological Sludge ◽  
Sludge Production

Sludge reduction in a wastewater treatment plant (WWTP) has recently become a key issue for the managing companies, due to the increasing constraints on the disposal alternatives. Therefore, all the solutions proposed with the aim of minimizing sludge production are receiving increasing attention and are tested either at laboratory or full-scale to evaluate their real effectiveness. In the present paper, electro-kinetic disintegration has been applied at full-scale in the recycle loop of the sludge drawn from the secondary settlement tank of a small WWTP for domestic sewage. After the disintegration stage, the treated sludge was returned to the biological reactor. Three different percentages (50, 75 and 100%) of the return sludge flow rate were subjected to disintegration and the effects on the sludge production and the WWTP operation efficiency evaluated. The long-term observations showed that the electro-kinetic disintegration was able to drastically reduce the amount of biological sludge produced by the plant, without affecting its treatment efficiency. The highest reduction was achieved when 100% return sludge flow rate was subjected to the disintegration process. The reduced sludge production gave rise to a considerable net cost saving for the company which manages the plant.

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