Analyzing wet weather flow management using state of the art tools

2008 ◽  
Vol 57 (8) ◽  
pp. 1247-1251 ◽  
Author(s):  
Denny S. Parker ◽  
Rion P. Merlo ◽  
Jose A. Jimenez ◽  
Eric J. Wahlberg
Keyword(s):  
Suspended Solids ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
State Of The Art ◽  
Fluid Dynamic ◽  
Municipal Wastewater Treatment ◽  
Secondary Clarifier ◽  
Wet Weather ◽  
Municipal Wastewater Treatment Plants

Optimal secondary clarifier performance is crucial to meet treatment requirements, especially when treating peak wet weather flows (PWWFs), to prevent high effluent suspended solids (ESS) concentrations and elevated sludge blankets. A state-of-the-art computational fluid dynamic (CFD) model was successfully used as a design and diagnostic tool to optimize performance for municipal wastewater treatment plants subject to significant PWWFs. Two case studies are presented. For Case Study 1, the model was used to determine the number of secondary clarifiers that will be necessary to treat future PWWF conditions for a plant under design. For Case Study 2, the model was used to identify modifications that are currently being made to increase the clarifier capacity for handling PWWF.

Microsieving in primary treatment: effect of chemical dosing

2016 ◽  
Vol 74 (2) ◽  
pp. 438-447 ◽  
Author(s):  
J. Väänänen ◽  
M. Cimbritz ◽  
J. la Cour Jansen
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Pilot Scale ◽  
Primary Treatment ◽  
Municipal Wastewater Treatment ◽  
Chemically Enhanced Primary Treatment ◽  
Municipal Wastewater Treatment Plants

Primary and chemically enhanced primary wastewater treatment with microsieving (disc or drum filtration) was studied at the large pilot scale at seven municipal wastewater treatment plants in Europe. Without chemical dosing, the reduction of suspended solids (SS) was (on average) 50% (20–65%). By introducing chemically enhanced primary treatment and dosing with cationic polymer only, SS removal could be controlled and increased to >80%. A maximum SS removal of >90% was achieved with a chemical dosing of >0.007 mg polymer/mg influent SS and 20 mg Al3+/L or 30 mg Fe3+/L. When comparing sieve pore sizes of 30–40 μm with 100 μm, the effluent SS was comparable, indicating that the larger sieve pore size could be used due to the higher loading capacity for the solids. Phosphorus removal was adjusted with the coagulant dose, and a removal of 95–97% was achieved. Moreover, microsieving offers favourable conditions for automated dosing control due to the low retention time in the filter.

scholarly journals Occurrence and Distribution of Antibiotic Resistance Genes in Municipal Wastewater Treatment Plants with D-Type Filters

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3398
Author(s):  
Haoze Wang ◽  
Bing Li ◽  
Jiaheng Zhao ◽  
Yongjing Tian ◽  
Yong Qiu
Keyword(s):  
Antibiotic Resistance ◽  
Wastewater Treatment ◽  
Resistance Gene ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Antibiotic Resistance Gene ◽  
Municipal Wastewater Treatment ◽  
Secondary Clarifier ◽  
Municipal Wastewater Treatment Plants ◽  
Type Fiber

Filters are popularly used in municipal wastewater treatment plants (WWTPs) as the final guards against effluent solids; however, their impacts on antibiotic resistance gene (ARG) removal in the WWTPs are still unclear. In this study, metagenomic analysis was used to find out the distribution characteristics of ARGs in two WWTPs equipped with the same D-Type fiber filters. Samples of influent, activated sludge liquor, secondary clarifier effluent, and D-Type filter effluent were found to host 695, 609, 675, and 643 ARG subtypes, respectively. The detected ARGs mainly included macB (4.1–8.9%), sav1866 (1.7–3.4%), and oleC (1.6–3.8%). Co-occurrence network analysis combined with contribution analysis helped to identify the ARG-related risks in the samples. Microbacterium, Acinetobacter, Gordonia, and Streptomyces significantly correlated with more than ten kinds of ARG subtypes, implying that they are potential hosts for these resistance gene subtypes. The number of ARG subtypes in the D-Type filter was less than those in the secondary clarifier effluent, indicating the potential of D-Type filters to effectively reduce the ARGs released into the environment. However, the abundance of two pathogens, Mycobacterium and PmrA, increased after the treatment by the D-Type filter, which may reveal the adverse effects of intercepting ARGs inside the fibers. The results may help the understanding of the complex role of the D-Type fiber filter on ARG distribution in WWTPs.

scholarly journals The Renewable Energy Sources for Municipal Wastewater Processes in Thailand: A Case Study of the Nonthaburi Wastewater Treatment Plant

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Krittiya Lertpocasombut ◽  
Sayan Sirimontree ◽  
Boonsap Witchayangkoon ◽  
Chanachai Thongchom ◽  
Veronica Winoto ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Renewable Energy Sources ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Alternative Sources ◽  
Municipal Wastewater Treatment Plants

Abstract There are 101 municipal wastewater treatment plants in Thailand supplied with electricity and cannot collect wastewater treatment fees. Alternative sources of energy for municipal wastewater treatment would reduce the electricity costs and future fossil energy uses. The Nonthaburi wastewater treatment plant (WWTP) is located in the Northwest of Bangkok and selected due to its available data. The solar energy source is applied to the Nonthaburi WWTP due to the light intensity and the area to install. By comparing to the wind and the biogas sources, the wind speed and the sludge production are not sufficient, respectively. Besides the estimated installation cost of the solar-cell panels among three companies, the NPV of 25 years and the IRR of three percent rate, the area required for installation is an affecting factor for the plant consideration.

Impact assessment of industrial and municipal effluents on surface water - a case study

1996 ◽  
Vol 34 (7-8) ◽  
pp. 141-145 ◽  
Author(s):  
Jana Zagorc-Koncan ◽  
Magda Cotman
Keyword(s):  
River Water ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Sediment Quality ◽  
Municipal Wastewater Treatment ◽  
Low Concentrations ◽  
Sediment Elutriates ◽  
Municipal Wastewater Treatment Plants ◽  
The Impact

Surface waters are used for disposal of industrial and municipal effluents. The regulations limit effluent concentrations of contaminants to protect rivers and their biota. Only low concentrations of various contaminants are usually found in treated effluents but they have often been accumulated over time in sediments. Sediment quality investigations are necessary beside water quality determination for assessment of harmful impacts of discharges on the river. The quality evaluation of Krka river was used as a case study for assessment of the impact of effluents from both industrial and municipal wastewater treatment plants. The evaluation of the impact of treated wastewaters on the river is based on chemical analysis of river water, sediment, sediment elutriates and pore water (COD, BOD, nutrients and metals) as well as toxicity measurements of river water and sediment elutriates. Sediment elutriates were prepared by natural leaching process simulation. By comparative investigations upstream and downstream from the wastewaters' discharges the influence of pollution upon the Krka river was studied.

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