Kinetic start-up performance of two large treatment plants for nutrient removal

2001 ◽  
Vol 43 (11) ◽  
pp. 153-160
Author(s):  
A. Haarbo ◽  
P. Harremoës ◽  
C. Thirsing
Keyword(s):  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Action Plan ◽  
Great Accuracy ◽  
Full Scale ◽  
Point Of View ◽  
Start Up ◽  
Main Emphasis ◽  
Optimum Solution ◽  
Kinetics Of

In 1987 an action plan was passed in the Danish Parliament demanding a considerable reduction of the discharge of nutrients to the aquatic environment in Denmark. Consequently, the two largest wastewater treatment plants in the Copenhagen area had to be upgraded to include nutrient removal. For more than 8 years an extensive effort has been made to determine an optimum solution for this upgrading from a technical and financial point of view. The work included six years of comprehensive pilot plant investigations with the aim of thoroughly studying and interpreting the kinetics of the processes involved. The investigations revealed valuable information particularly concerning limitations of the nitrification process. Consequently, the investigations contributed to an expectation of no unforeseen problems during the implementation of the upgraded plants. This paper presents the results of the start-up of the two full-scale plants with the main emphasis laid on the kinetic performance in relation to the information achieved from the pilot tests. The results showed that the start-up of the full scale plants proceeded with great accuracy as expected from the investigations. Accordingly, the implementation of the plants was carried out successfully, ending an era of more than 10 years in total.

Rapid start-up of one-stage deammonification MBBR without addition of external inoculum

2016 ◽  
Vol 74 (11) ◽  
pp. 2541-2550 ◽  
Author(s):  
Linda Kanders ◽  
Daniel Ling ◽  
Emma Nehrenheim
Keyword(s):  
Wastewater Treatment Plants ◽  
Full Scale ◽  
Anammox Bacteria ◽  
Operational Mode ◽  
Bacterial Populations ◽  
Reject Water ◽  
One Stage ◽  
Start Up ◽  
Laboratory Reactor ◽  
Set Up

In recent years, the anammox process has emerged as a useful method for robust and efficient nitrogen removal in wastewater treatment plants (WWTPs). This paper evaluates a one-stage deammonification (nitritation and anammox) start-up using carrier material without using anammox inoculum. A continuous laboratory-scale process was followed by full-scale operation with reject water from the digesters at Bekkelaget WWTP in Oslo, Norway. A third laboratory reactor was run in operational mode to verify the suitability of reject water from thermophilic digestion for the deammonification process. The two start-ups presented were run with indigenous bacterial populations, intermittent aeration and dilution, to favour growth of the anammox bacterial branches. Evaluation was done by chemical and fluorescence in situ hybridization analyses. The results demonstrate that anammox culture can be set up in a one-stage process only using indigenous anammox bacteria and that a full-scale start-up process can be completed in less than 120 days.

scholarly journals The Microbial Database for Danish wastewater treatment plants with nutrient removal (MiDas-DK) – a tool for understanding activated sludge population dynamics and community stability

2013 ◽  
Vol 67 (11) ◽  
pp. 2519-2526 ◽  
Author(s):  
A. T. Mielczarek ◽  
A. M. Saunders ◽  
P. Larsen ◽  
M. Albertsen ◽  
M. Stevenson ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Amplicon Sequencing ◽  
Temporal Variations ◽  
Full Scale ◽  
16S Rrna Amplicon Sequencing ◽  
Specific Factors ◽  
Operational Data

Since 2006 more than 50 Danish full-scale wastewater treatment plants with nutrient removal have been investigated in a project called ‘The Microbial Database for Danish Activated Sludge Wastewater Treatment Plants with Nutrient Removal (MiDas-DK)’. Comprehensive sets of samples have been collected, analyzed and associated with extensive operational data from the plants. The community composition was analyzed by quantitative fluorescence in situ hybridization (FISH) supported by 16S rRNA amplicon sequencing and deep metagenomics. MiDas-DK has been a powerful tool to study the complex activated sludge ecosystems, and, besides many scientific articles on fundamental issues on mixed communities encompassing nitrifiers, denitrifiers, bacteria involved in P-removal, hydrolysis, fermentation, and foaming, the project has provided results that can be used to optimize the operation of full-scale plants and carry out trouble-shooting. A core microbial community has been defined comprising the majority of microorganisms present in the plants. Time series have been established, providing an overview of temporal variations in the different plants. Interestingly, although most microorganisms were present in all plants, there seemed to be plant-specific factors that controlled the population composition thereby keeping it unique in each plant over time. Statistical analyses of FISH and operational data revealed some correlations, but less than expected. MiDas-DK (www.midasdk.dk) will continue over the next years and we hope the approach can inspire others to make similar projects in other parts of the world to get a more comprehensive understanding of microbial communities in wastewater engineering.

The investigation of the advanced treatment of municipal wastewater by modular flotation-filtration systems and reuse for irrigation

1996 ◽  
Vol 33 (10-11) ◽  
pp. 171-179 ◽  
Author(s):  
Milos Krofta ◽  
Dusan Miskovic ◽  
David Burgess ◽  
Edward Fahey
Keyword(s):  
Pilot Study ◽  
Municipal Wastewater ◽  
Full Scale ◽  
Advanced Treatment ◽  
Start Up ◽  
Turbidity Level ◽  
Hydraulic Load ◽  
The Impact ◽  
Kinetics Of ◽  
Pilot Tests

The objective of this study was to provide clarified municipal wastewater effluent at the turbidity level of less than 2.0 NTU and reuse for landscape irrigation (golf course). For that purpose, during pilot -study first was used a combined flotation-filtration module-clarifier alone (Alternative I). A particularly designed configuration of the primary flotation unit and combined flotation-filtration clarifier, as a modular clarification system was used in the next step of the investigation (Alternative II). In addition, start up of the full scale plant was performed as well. In the first phase of this study, the impact of the type and concentration of coagulant and flocculant was tested. As a result, mechanisms of flocculation were proposed. Only under the moderate hydraulic loads (75.7-151.4 LPM) during pilot tests by Alternative I, was it possible to reach satisfactory turbidity reduction. By the Alternative II, the clarification performance was improved under the higher hydraulic load (302.8 LPM). The kinetics of the investigated flotation systems were assesed by empirical flotation models. Based on the pilot-study, Alternative II is recommended in order to reduce the high solids loadings under a higher hydraulic load, and it provided irrigation water at a required rate of 3785 m3/d during start up and optimization of the full scale plant.

Northern Europe's Largest Wastewater Treatment Plant in Copenhagen Upgraded to Nutrient Removal

1992 ◽  
Vol 25 (4-5) ◽  
pp. 339-346
Author(s):  
J. L. Hansen ◽  
P. S. Nielsen
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Treatment Process ◽  
Wastewater Treatment Plants ◽  
Action Plan ◽  
Treatment Plant ◽  
Financial Evaluation ◽  
Design Load ◽  
Choice Of Treatment ◽  
Made In

In connection with the Danish Action Plan on the Aquatic Environment (APAE), the Copenhagen wastewater treatment plants are to be upgraded to nutrient removal. This paper describes the way in which the basis of the decision in respect of design load, choice of treatment process, upgrade type, etc. is achieved. There are 2 wastewater treatment plants in Copenhagen and it is possible either to upgrade both plants or only to upgrade one and close the other one. It was decided to upgrade both plants and we describe the rationale for this decision. An extensive effort has been made in order to choose the treatment process. The technical-financial evaluation of various methods will be described, as will the testing of the chosen methods in pilot plants. The design load criteria include the present load, industrial discharges of nutrients, runoff, infiltration, water consumption forecasts, and wastewater temperature. Finally, the plans for a gradual extension are described. The first stage aims at an extension to the load expected in 1996 when the plant will be put into operation, however, with the possibility to adapt the size of the works during construction, if developments do not correspond to expectations.

Observations on the Kinetics of Nitrification under Inhibiting Conditions Caused by Industrial Wastewater Compounds

1993 ◽  
Vol 28 (2) ◽  
pp. 115-123 ◽  
Author(s):  
O. Nowak ◽  
K. Svardal
Keyword(s):  
Industrial Wastewater ◽  
Competitive Inhibition ◽  
Wastewater Treatment Plants ◽  
Ammonia Concentration ◽  
Ammonia Nitrogen ◽  
Start Up ◽  
Wide Range ◽  
Nitrification Process ◽  
Autotrophic Biomass ◽  
Kinetics Of

Within the next few years nitrogen removal will be obligatory for both municipal and industrial wastewater treatment plants in Austria. During the operation of pilot plants, severe inhibition of the nitrification process has been observed in several cases. Further investigations have been carried out at two biochemical factories at temperatures in the range of 22 to 32 ±C, in one case at two pilot plants, in the other case at a full-scale plant in order to estimate kinetic parameters of nitrifying biomass under the particular inhibiting conditions of these wastewaters. In both cases competitive inhibition occurred during the start-up period for about two months. The ammonia nitrogen half-saturation coefficient for autotrophic biomass was in the range of 10 mg/l. In one case also maximum autotrophic specific growth rate varied in a wide range. It could be proved that the compounds of this wastewater have an inhibiting but no toxic effect on Nitrosomonas. The effluent ammonia concentration can be kept within the limits in case of competitive as well as non-competitive inhibition up to about 60% by increased minimum SRT. In case of severe non-competitive inhibition it is not possible to achieve feasible biological nitrification. In any case the inhibiting compounds should be located and removed from the wastewater.

The influence of PAX-14 on activated sludge systems and in particular on Microthrix parvicella

2002 ◽  
Vol 46 (1-2) ◽  
pp. 487-490 ◽  
Author(s):  
T. Roels ◽  
F. Dauwe ◽  
S. Van Damme ◽  
K. De Wilde ◽  
F. Roelandt
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Full Scale ◽  
Morphological Properties ◽  
Eu Directive ◽  
Solids Separation ◽  
Microthrix Parvicella ◽  
Separation Problems ◽  
Activated Sludge Systems

The amount of wastewater treatment plants (WWTP) dealing with solid separation problems has significantly increased since the new requirements of the EU Directive 271/91 on nutrient removal. In Flanders a number of the nutrient removal WWTP are affected by solid separation problems mostly attributed to Microthrix parvicella being the most common dominant species. The effect of dosing polyaluminium chloride (PAX-14) on activated sludge is illustrated for WWTP solids separation problems, in particular because of Microthrix parvicella. The effects of the addition of PAX-14 on the microbiology and the morphology of Microthrix parvicella were studied in 9 full-scale WWTPs. PAX-14 succeeded in reducing high SVI-values and controlled foaming problems whenever caused by Microthrix parvicella. Laboratory trials have shown that the dosage of PAX-14 should be less than 150 μL/L or 7 g Al3+/kg MLSS. At a dosage higher than 250 μL/L, an increase of free bacteria and a decrease of the protozoa activity are observed. In full-scale, PAX-14 is dosed at a concentration of 1.5 to 4.5 g Al3+/kg MLSS. Before addition, the mixed liquor scum layer – if present – should be removed. In our experience, the dosing should last for at least 3 weeks. During the first week, no drastic changes occur. At the end of the first week, an increase of SS and SVI is possible. The SVI and scum start to decrease after 10 to 15 days. The amount of filaments is reduced after 3 to 3½ weeks. The morphological properties of Microthrix parvicella change, while other filaments such as Nostocoida limicola and Nocardia spp. are not affected. This study proves that PAX-14 is effective in controlling bulking and foaming problems at WWTPs when they are due to Microthrix parvicella. Prediction of when the SVI will decrease and when addition should be stopped is possible.

scholarly journals Nutrient Removal Performance on Domestic Wastewater Treatment Plants (Full Scale System) between Tropical Humid and Cold Climates

2018 ◽  
pp. 32-39
Author(s):  
Pongsak Noophan ◽  
Rawiwan Rodpho ◽  
Pimook Sonmee ◽  
Martha Hahn ◽  
Suthep Sirivitayaphakorn
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Domestic Wastewater ◽  
Full Scale ◽  
Biological Nutrient Removal ◽  
Cold Climates ◽  
Domestic Wastewater Treatment ◽  
Warm Climates

Two full scale systems of oxidation ditches for domestic wastewater treatment plants (WWTP) were used as study sites: Phuket Province, southern Thailand (representative of tropical humid climates) and Plum Creek, Castle Rock, Colorado, USA (representative of cold climates). The treatment systems at both sites were designed for biological nutrient removal (BNR) fromextended activated sludge. Nitrogen is removed by nitrification-denitrification processes. The solid retention time (SRT) for both treatment plants was ≥ 10 das recommended by theory for complete nitrification in activated sludge wastewater treatment plants. Influents and effluents from these sites were compared in respect to flow rate, biochemical oxygen demand (BOD), organic nitrogen, ammonium, nitrate, total nitrogen, and phosphorus concentrations. At both sites, nutrient removal reached more than 75% because there was sufficient carbon for denitrifying and phosphate accumulating organisms. Furthermore, low dissolved oxygen concentration, long SRT, and hightemperature could be key factors to promote activity of some groups of bacteria in consuming organic matter and nutrients in wastewater in warm climates. For this reason, plant design and operating procedures for wastewater treatment in cold climates might not be always be applicable to warm climates.

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