Realisation of the EU Directive 91/271/EWG in Germany - technical and economic effects from the perspective of an operator of large wastewater treatment plants

2004 ◽  
Vol 50 (7) ◽  
pp. 257-263 ◽  
Author(s):  
F. Obenaus ◽  
A. Kraft
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Economic Effects ◽  
Federal Republic Of Germany ◽  
National Regulation ◽  
Eu Directive ◽  
European Court ◽  
And Performance ◽  
The Eu

In the Federal Republic of Germany, the requirements on the effluent quality which wastewater treatment plants (WWTPs) with a design value larger than 100,000 PE must achieve in regard to the parameter Nanorg were increased by a national regulation on 01/08/2002. The reason for this action was a pending threat of the European Court because of the insufficient realisation of the EU Municipal Wastewater Directive (91/271/EWG). The report at hand describes the consequences of such an increase of the requirements for operators of WWTPs, using the example of Emschergenossenschaft and Lippeverband. The currently applicable demands in Germany are compared to those valid on a European level, and the current construction and performance state of the WWTPs operated by Emschergenossenschaft and Lippeverband is presented. The secure compliance with the increased requirements necessitates optimisation measures, but also construction measures; these are described in regard to their technical realisation and the prospective costs.

Extension of two large wastewater treatment plants in Stockholm using membrane technology

2016 ◽  
Vol 11 (4) ◽  
pp. 744-753 ◽  
Author(s):  
S. Andersson ◽  
P. Ek ◽  
M. Berg ◽  
J. Grundestam ◽  
E. Lindblom
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Action Plan ◽  
Municipal Wastewater Treatment ◽  
Large Cities ◽  
Effluent Quality ◽  
Municipal Wastewater Treatment Plants ◽  
The Baltic ◽  
The Eu

Like many other large cities, Stockholm is facing increased urbanization with densification of infrastructure as a result. At the same time, implementation of the Baltic Sea Action Plan and the EU Water Framework Directive is expected to result in more stringent effluent quality demands. The current situation gives rise to new challenges for the municipal wastewater treatment plants (WWTPs). This paper describes how two of Sweden's largest municipal water organizations; Stockholm Vatten and Syvab, will face these challenges using ultrafiltration (UF) membrane bioreactor (MBR) technology. The effluent requirements for the rehabilitated plants are expected to be tightened to 6 mg/l and 0.2 mg/l for total nitrogen (TN) and total phosphorus (TP), respectively.

scholarly journals Characteristics and performance of small and medium wastewater treatment plants in Greece

2017 ◽  
Vol 12 (3) ◽  
pp. 520-533
Author(s):  
E. Gavalakis ◽  
P. Poulou ◽  
A. Tzimas
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
Organic Load ◽  
Wastewater Management ◽  
Effluent Quality ◽  
Future Challenges ◽  
And Performance

Wastewater management in Greece is being regulated by the Urban Waste Water Treatment Directive (UWWTD) and as a result many wastewater treatment plants (WWTPs) have been constructed during the last 30 years and are in operation. The present work aims to outline the progress regarding the implementation of the specific environmental policy, present deficiencies and future challenges, while an evaluation of the performance is conducted for small-medium and large WWTPs focusing on the influent and effluent quality characteristics. In Greece the existing level of treatment provided is related to secondary treatment for the removal of organic load, which in most cases is supplemented by nitrogen removal (for more than 85% of the WWTPs) and phosphorus removal. With respect to the characteristics of the raw municipal wastewater these correspond to typical low to medium strength sewage. Compliance to the UWWTD effluent standards for BOD5, COD and SS is achieved in more than 90% of the WWTPs, while in terms of nutrients, 80% of the WWTPs efficiently remove nitrogen and approximately 45% of the WWTPs remove phosphorus.

Candidatus Kaistella beijingensis sp. nov. isolated from a municipal wastewater treatment plant is involved in sludge foaming

2021 ◽  
Author(s):  
Yang Song ◽  
Cheng-Ying Jiang ◽  
Zong-Lin Liang ◽  
Hai-Zhen Zhu ◽  
Yong Jiang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Extracellular Polymeric Substances ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Bacterial Populations ◽  
Microbiological Methods ◽  
Culture Independent ◽  
And Performance

Biological foaming (or biofoaming) is a frequently occurring problem in wastewater treatment plants (WWTPs) and is attributed to the overwhelming growth of filamentous bulking and foaming bacteria (BFB). Biological foaming has been intensively investigated, with BFB like Microthrix and Skermania having been identified from WWTPs and implicated in foaming. Nevertheless, studies are still needed to improve our understanding of the microbial diversity of WWTPs biofoams and how microbial activities contribute to foaming. In this study, sludge foaming at the Qinghe WWTP of China was monitored, and sludge foams were investigated using culture-dependent and culture-independent microbiological methods. The foam microbiomes exhibited high abundances of Skermania , Mycobacterium , Flavobacteriales , and Kaistella . A previously unknown bacterium, Candidatus Kaistella beijingensis, was cultivated from foams, its genome sequenced, and it was phenotypically characterized. Ca . K. beijingensis exhibits hydrophobic cell surfaces, produces extracellular polymeric substances (EPS), and metabolizes lipids. Ca . K. beijingensis abundances were proportional to EPS levels in foams. Several proteins encoded by the Ca . K. beijingensis genome were identified from EPS that was extracted from sludge foams. Ca . K. beijingensis populations accounted for 4–6% of the total bacterial populations in sludge foam samples within the Qinghe WWTP, although their abundances were higher in spring than in other seasons. Co-occurrence analysis indicated that Ca . K. beijingensis was not a core node among the WWTP community network, but its abundances were negatively correlated with those of the well-studied BFB Sker mania piniformis among cross-season Qinghe WWTP communities. Importance Biological foaming or scumming is a sludge separation problem that has become the subject of major concern for long-term stable activated sludge operation in decades. Biological foaming was considered induced by foaming bacteria. However, the occurrence and deterioration of foaming in many WWTPs are still not completely understood. Cultivation and characterization of the enriched bacteria in foaming are critical to understand their genetic, physiological, phylogenetic, and ecological traits, as well as to improve the understanding of their relationships with foaming and performance of WWTPs.

A study about the use of chemicals in conventional tertiary treatment. Performances comparison of three municipal wastewater treatment plants and pilot plant experiences

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
A. Iborra-Clar ◽  
J.A. Mendoza-Roca ◽  
A. Bes-Pií ◽  
J.J. Morenilla-Martínez ◽  
I. Bernácer-Bonora ◽  
...  
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Pilot Plant ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Wastewater Reclamation ◽  
Valencian Region ◽  
Municipal Wastewater Treatment Plants

Rainfall diminution in the last years has entailed water scarcity in plenty of European regions, especially in Mediterranean areas. As a consequence, regional water authorities have enhanced wastewater reclamation and reuse. Thus, the implementation of tertiary treatments has become of paramount importance in the municipal wastewater treatment plants (WWTP) of Valencian Region (Spain). Conventional tertiary treatments consist of a physico-chemical treatment of the secondary effluent followed by sand filtration and UV radiation. However, the addition of coagulants and flocculants sometimes does not contribute significantly in the final water quality. In this work, results of 20-months operation of three WWTP in Valencian Region with different tertiary treatments (two without chemicals addition and another with chemicals addition) are discussed. Besides, experiments with a 2 m3/h pilot plant located in the WWTP Quart-Benager in Valencia were performed in order to evaluate with the same secondary effluent the effect of the chemicals addition on the final water quality. Results showed that the addition of chemicals did not improve the final water quality significantly. These results were observed both comparing the three full scale plants and in the pilot plant operation.

Nanofiltration of endocrine disrupting compounds

2003 ◽  
Vol 3 (5-6) ◽  
pp. 321-327 ◽  
Author(s):  
M. Gallenkemper ◽  
T. Wintgens ◽  
T. Melin
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Endocrine Disrupting Compounds ◽  
Municipal Wastewater Treatment ◽  
Water And Wastewater Treatment ◽  
Wide Range ◽  
Endocrine Disrupting ◽  
Municipal Wastewater Treatment Plants ◽  
Set Up

Endocrine disrupting compounds can affect the hormone system in organisms. A wide range of endocrine disrupters were found in sewage and effluents of municipal wastewater treatment plants. Toxicological evaluations indicate that conventional wastewater treatment plants are not able to remove these substances sufficiently before disposing effluent into the environment. Membrane technology, which is proving to be an effective barrier to these substances, is the subject of this research. Nanofiltration provides high quality permeates in water and wastewater treatment. Eleven different nanofiltration membranes were tested in the laboratory set-up. The observed retention for nonylphenol (NP) and bisphenol A (BPA) ranged between 70% and 100%. The contact angle is an indicator for the hydrophobicity of a membrane, whose influence on the permeability and retention of NP was evident. The retention of BPA was found to be inversely proportional to the membrane permeability.

Experience from 10 Years Advanced Wastewater Treatment – Technology and Results

1982 ◽  
Vol 14 (1-2) ◽  
pp. 121-133
Author(s):  
C Forsberg ◽  
B Hawerman ◽  
B Hultman
Keyword(s):  
Wastewater Treatment ◽  
Urban Population ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Treatment Technology ◽  
Removal Efficiencies ◽  
Municipal Wastewater Treatment Plants ◽  
Operational Modes ◽  
Polluted Waters

Experience from advanced municipal wastewater treatment plants and recovery of polluted waters are described for the last ten years in Sweden. Except in municipalities with large recipients, the urban population is served by treatment plants with combined biological and chemical treatment. Most of these plants are post-precipitation plants. Several modified operational modes have been developed in order to improve the removal efficiencies of pollutants and to reduce the costs. Results are presented on the recovery of specially investigated lakes with a lowered supply of total phosphorus and organic matter.

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