A simulation-based integrated approach to optimize the biological nutrient removal process in a full-scale wastewater treatment plant

2011 ◽  
Vol 174 (2-3) ◽  
pp. 635-643 ◽  
Author(s):  
Fang Fang ◽  
Bingjie Ni ◽  
Wenwei Li ◽  
Guoping Sheng ◽  
Hanqing Yu
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Integrated Approach ◽  
Full Scale ◽  
Biological Nutrient Removal ◽  
Removal Process ◽  
Simulation Based

A logistic model for the remediation of filamentous bulking in a biological nutrient removal wastewater treatment plant

2015 ◽  
Vol 72 (3) ◽  
pp. 391-405 ◽  
Author(s):  
Nashia Deepnarain ◽  
Sheena Kumari ◽  
Jordache Ramjith ◽  
Feroz Mahomed Swalaha ◽  
Valter Tandoi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
In Situ Hybridisation ◽  
Treatment Plant ◽  
Full Scale ◽  
Biological Nutrient Removal ◽  
Filamentous Bacteria ◽  
Operational Parameters ◽  
Filamentous Bulking

Biological nutrient removal (BNR) systems across the globe frequently experience bulking and foaming episodes, which present operational challenges such as poor sludge settling due to excessive filamentous bacteria. A full-scale BNR plant treating primarily domestic wastewater was monitored over a period of 1 year to investigate filamentous bacterial growth response under various plant operating parameters. Identification of filamentous bacteria by conventional microscopy and fluorescent in situ hybridisation indicated the dominance of Eikelboom Type021N, Thiothrix spp., Eikelboom Type 1851 and Eikelboom Type 0092. A cumulative logit model (CLM) was applied to elucidate significant relationships between the filamentous bacteria and plant operational parameters. The model could predict the potential abundance of dominant filamentous bacteria in relation to wastewater treatment plant operational parameters. Data obtained from the model corroborated with previous findings on the dominance of most filaments identified, except for Type 0092, which exhibited some unique traits. With further validation, the model could be successfully applied for identifying specific parameters which could contribute towards filamentous bulking, thus, providing a useful tool for regulating specific filamentous growth in full-scale wastewater treatment plants.

Alternatives for upgrading the Wilderness Wastewater Treatment Plant for biological nutrient removal

2004 ◽  
Vol 48 (11-12) ◽  
pp. 453-462
Author(s):  
E.U. Cokgor ◽  
C.W. Randall
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Biological Nutrient Removal ◽  
Oxidation Ditch ◽  
Concentric Ring ◽  
Annual Average ◽  
Flow Capacity ◽  
Ring Oxidation

The Wilderness Wastewater Treatment Plant (WWTP) located in Orange County, Virginia is a four concentric ring oxidation ditch activated sludge system with a rated capacity of 1,935 m3/day. The three outer rings are used for wastewater treatment and the inner ring is used as an aerobic digester. The flow capacity has been increased from 1,935 to 3,760 m3/d, however, the desired design capacity has since been increased to 3,870 m3/d, and there are plans to eventually expand to approximately 4,840 m3/d with improved nitrogen removal. The design goal for the planned upgrade is to discharge an effluent that contains less than 10 mg/l total nitrogen (TN) at all times, with an annual average of 8 mg/l or less. In this study, the pre-upgrade performance of the Wilderness Wastewater Treatment Plant was evaluated and several modifications were recommended for the incorporation of biological nutrient removal (BNR).

Achievement of Biological Nutrient Removal in a Full-Scale Rotating Biological Contactor Wastewater Treatment Plant

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2217-2220 ◽  
Author(s):  
K. E. Neu
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Biological Nutrient Removal ◽  
Secondary Effluent ◽  
Rotating Biological Contactor ◽  
Design Load ◽  
Hydraulic Design ◽  
Demonstration Site

A Central Wisconsin municipal treatment plant (WWTP) with a significant industrial contribution and seven (7) years of Rotating Biological Contractor (RBC) operation was the demonstration site for process modifications which provided significant biological nutrient removal (BNR). The study was conducted June-October, 1990. The plant was near 70% of hydraulic design load and averaged 90% of organic design load, with numerous excursions above organic design load. The BOD:P ratio was above 20:1, and the BOD:TKN ratio was above 10:1. Process modifications resulted in total phosphorus and total nitrogen reductions of 60-90% without chemical addition. Other benefits realized include increased clarity of the secondary effluent and an approximate 50% reduction of RBC shaft biomass weight.

An integrated approach to analyse biofilms of a full scale wastewater treatment plant

2002 ◽  
Vol 46 (1-2) ◽  
pp. 199-206 ◽  
Author(s):  
M. Martín-Cereceda ◽  
B. Pérez-Uz ◽  
S. Serrano ◽  
A. Guinea
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Integrated Approach ◽  
Full Scale ◽  
Ciliate Species ◽  
Volatile Solids ◽  
Composition And Structure ◽  
Three Stages ◽  
Biofilm Structure

A rotating biological contactor (RBC) system operating in a full-scale wastewater treatment plant has been described by several approaches accounting for performance, composition and structure of biofilms in three stages through biological wastewater treatment (RBC1, RBC 2, RBC 3). RBC biofilms were effective in removing the BOD loading from 13 g BOD5 d−1 m−2 in RBC 1 to 6 g BOD5 d−1 m−2 in RBC 3. Analysis of biofilm composition showed: i) the volatile solids were similar in the three RBCs (0.6 g m−2 VS per g m−2 of TS); ii) the protozoan and metazoan biocenosis was mainly made up of ciliated protozoa, which were most abundant in RBC 2 (1.84 × 106 ciliates g−1 VS). Relationship between ciliate species and physical-chemical profile of the system by cluster analysis indicated that the species Acineria uncinata, Amphileptus punctatus, Cinetochilum margaritaceum and Holosticha mancoidea were associated with the best RBC performance; iii) the exopolymeric matrix of the three RBC biofilms was mainly constituted by proteins, although humic substances, polysaccharides, uronic acids and DNA were also found. Analysis of biofilm structure by confocal microscopy indicated changes in biofilm organisation with depth. Results have been brought together and a graphic representation of the composition and architecture of RBC biofilms is presented.

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