ECOLOGICAL HEALTH ASSESSMENTS BASED ON WHOLE EFFLUENT TOXICITY TESTS AND THE INDEX OF BIOLOGICAL INTEGRITY IN TEMPERATE STREAMS INFLUENCED BY WASTEWATER TREATMENT PLANT EFFLUENTS

2007 ◽  
Vol 26 (9) ◽  
pp. 2010 ◽  
Author(s):  
Jin Sung Ra ◽  
Sang Don Kim ◽  
Nam Ik Chang ◽  
Kwang-Guk An
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Toxicity Tests ◽  
Biological Integrity ◽  
Ecological Health ◽  
Whole Effluent Toxicity ◽  
Effluent Toxicity ◽  
Temperate Streams ◽  
Health Assessments

Ecotoxicological and chemical characterization of municipal wastewater treatment plant effluents

1996 ◽  
Vol 33 (6) ◽  
pp. 83-91 ◽  
Author(s):  
J. Garric ◽  
B. Vollat ◽  
D. K. Nguyen ◽  
M. Bray ◽  
B. Migeon ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Chemical Characterization ◽  
Ammonia Concentration ◽  
Toxicity Tests ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plant ◽  
Long Term Effect

The toxicity and the chemical quality of three municipal wastewater effluents have been studied. Acute and sub-chronic bioassays were carried out. We also measured the induction of the hepatic ethoxy resorufin-O-deethylase enzymatic activity (EROD) of fish exposed to the effluents. Chemical analysis allowed to identify the most frequent substances detected in the effluents. From chemical data and results of bioassays we conclude that ammonia concentration explains a part of the lethal toxicity. But chronic toxicity tests carried out with whole effluents or extracted chemical fractions showed that organic pollutants detected in the effluents could also cause long-term effect. All the tested effluents induced fish EROD activity. The instream invertebrates monitoring confirmed the municipal wastewater treatment plant impact on the receiving water.

Analysis and balance of phosphorous removal from wastewater at urban wastewater treatment plant

2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Recovery ◽  
Anaerobic Sludge ◽  
Biological Phosphorus Removal ◽  
The Mean

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

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