Melbourne water's wastewater treatment lagoons: design modifications to reduce odours and enhance nutrient removal

1996 ◽  
Vol 33 (7) ◽  
pp. 157-164 ◽  
Author(s):  
Brian Hodgson ◽  
Peter Paspaliaris
Keyword(s):  
Wastewater Treatment ◽  
Uv Light ◽  
Treatment Plant ◽  
Algal Growth ◽  
Inorganic N ◽  
Anaerobic Reactor ◽  
Untreated Wastewater ◽  
Low Levels ◽  
Odour Emissions ◽  
Ammonia Oxidising Bacteria

Some properties of 3 “new style” wastewater treatment lagoons, 115E, 55E and 25W at the Melbourne Water, Western Treatment Plant (WTP) treating some 250 megalitres (ML) of untreated wastewater each day are described. There is a potential residence time for each of 120 days and each consists of a sequence of up to 11 ponds. Pond 1 has an anaerobic reactor of 90, 150, and 150 ML respectively and Warmens floating aerators are installed on ponds 1 and 2 of 115E and 25W and pond 1 of 55E. BOD5 values of less than 50 are achieved by the end of pond 2 and these together with the installation of the HDPE cover on 115E have effectively reduced odour emissions. Nitrogen is removed by ammonification followed by either nitrification/denitrification, or algal growth which is grazed by zooplankton. Since the introduction of the aerators, chemolithotrophic ammonia oxidising bacteria (CAOB) are more frequently exposed to the inhibitory action of UV light, and therefore nitrification is more sporadic. Turbidity of the water may play a significant role in protecting the CAOB from UV light. The lagoons have the potential to produce an effluent with inorganic-N levels of less than 2 mg/L, a BOD5 of less than 50 mg/L and low levels of algae. The covered anaerobic reactor can in each case produce up to 20,000 cubic metres of gas each day comprising of 80% methane. Methane will be used to generate electricity, and the zooplankton generated by feeding on algae will be harvested to provide food for fish fry.

scholarly journals Biochemical Hydrogen Potential Tests Using Different Inocula

2019 ◽  
Vol 11 (3) ◽  
pp. 622 ◽  
Author(s):  
Isabella Pecorini ◽  
Francesco Baldi ◽  
Renato Iannelli
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Digested Sludge ◽  
Anaerobic Reactor ◽  
Municipal Wastewater Treatment Plant ◽  
Solids Removal

Four inocula collected from different operating facilities were tested in their hydrogenic performances by means of two biochemical hydrogen potential test set-ups using sucrose and food waste as substrates, with the aim of evaluating the influence of inoculum media in batch fermentative assays. The selected inocula were: activated sludge collected from the aerobic unit of a municipal wastewater treatment plant, digested sludge from an anaerobic reactor treating organic waste and cattle manure, digested sludge from an anaerobic reactor treating agroindustrial residues, and digested sludge from an anaerobic reactor of a municipal wastewater treatment plant. Test results, in terms of specific hydrogen production, hydrogen conversion efficiency, and volatile solids removal efficiency, were significantly dependent on the type of inoculum. Statistical analysis showed different results, indicating that findings were due to the different inocula used in the tests. In particular, assays performed with activated sludge showed the highest performances for both substrates and both experimental set-ups.

Biological treatment of industrial wastes in a photobioreactor

2006 ◽  
Vol 53 (11) ◽  
pp. 117-125 ◽  
Author(s):  
E. Tamer ◽  
M.A. Amin ◽  
E.T. Ossama ◽  
M. Bo ◽  
G. Benoit
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Algal Growth ◽  
Bacterial Consortium ◽  
Industrial Wastes ◽  
Synthetic Wastewater ◽  
Phenol Removal ◽  
The Real ◽  
Real Wastewater

An algal-bacterial consortium was tested for the treatment from a coke factory. A Chlorella vulgaris strain and a phenol-degrading Alcaligenes sp. were first isolated from the wastewater treatment plant to serve as inocula in the subsequent biodegradation tests. Batch tests were then conducted with samples from the real wastewater or using a synthetic wastewater containing 325 mg phenol/l and 500 mg NH4+/l as target pollutants. Direct biological treatment of the real wastewater was not possible due to the toxicity of organic compounds. Activated carbon adsorption and UV(A-B)-irradiation were efficient in detoxifying the effluent for subsequent biological treatment as inoculation of pretreated samples with the algal-bacterial consortium was followed by complete phenol removal and NH4+ removal of 45%. Complete phenol removal and 33% NH4+ removal were achieved during the fed-batch treatment of artificial wastewater at 6 d hydraulic retention time (HRT). Under continuous feeding at 3.6 d HRT, phenol and NH4+ removal dropped to 58 and 18%, respectively. However, complete phenol removal and 29% NH4+ removal were achieved when 8 g NaHCO3/l was added to the artificial wastewater to enhance algal growth. This study confirms the potential of solar-based industrial wastewater treatment based on solar-based UV pretreatment followed by algal-bacterial biodegradation.

scholarly journals The biomass, survival, reproductive and biomarker responses of Helix pomatia to soil contaminated with treated and untreated wastewater.

2021 ◽  
Author(s):  
Semase Matseleng ◽  
Ozekeke Ogbeide ◽  
Patricks' Otomo Voua
Keyword(s):  
Wastewater Treatment ◽  
Egg Production ◽  
Wastewater Treatment Plants ◽  
Helix Pomatia ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Invertebrate Fauna ◽  
Untreated Wastewater ◽  
Industrial Town ◽  
Treatment Facilities

Abstract Wastewater treatment facilities in developing countries like South Africa are major sources of contaminants via effluent into the environment, which could portend high toxicity risks for non-target flora and fauna. To this end, a study was conducted to determine the ecotoxicological responses of selected organism to treated and untreated wastewater from the wastewater treatment plants in an industrial town. The snail Helix pomatia was exposed to OECD artificial soil spiked with untreated or treated wastewater at the following concentrations: 0, 25, 50, 75, 100%. The ecotoxicological responses of Helix pomatia to wastewater were determined by assessing the biomass, survival, reproduction and biomarker responses (Catalase ‒ CAT and Acetylcholinesterase ‒ AChE activities). The overall results showed significant effects on the survival, reproduction and biomass of H. pomatia. Similar results were observed for juvenile emergence. An EC50 of 5.751% for egg production and an EC50 of 6.233% for juvenile emergence were determined in the untreated wastewater. Such indices could not be computed for the treated wastewater, indicating a decreased in toxicity between the untreated and the treated samples. For both the AChE and CAT activities, there was no statistical difference between treated and untreated wastewater treatments. The results from this study highlight the toxic effects of untreated wastewater and indicate that treated wastewater (effluent) released from the wastewater treatment plant in Phuthaditjhaba remains suitable for invertebrate fauna such as H. pomatia.

scholarly journals COMPARISON OF OPERATION OF KAUNAS AND KLAIPĖDA WWTPS DIGESTERS

2015 ◽  
Author(s):  
Midona DAPKIENĖ ◽  
Laima ČESONIENĖ ◽  
Tomas PILIPAUSKAS,
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Organic Materials ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Technological Parameters ◽  
Anaerobic Reactor ◽  
Actual Output ◽  
Biogas Output

The article provides comparison of operation of digesters for 2014, installed in wastewater treatment plants (WWTP) of two Lithuanian cities Kaunas and Klaipėda. It was established that the temperature and decomposition degree of organic materials had impact on biogas discharge in digesters of both wastewater treatment plants. Increase of these technological parameters resulted in increase of biogas output. Actual output of biogas of Kaunas wastewater treatment plant digester was by 5.8 % less than theoretical output, in Klaipėda WWTP anaerobic reactor – by 4.2 %. After comparison of biogas discharge generated from 1 m3 of sludge in Kaunas and Klaipėda WWTPs it was established that the efficiency of Klaipėda WWTP digester exceeded the efficiency of Kaunas WWTP reactor by 7 %.

scholarly journals Impact of Operational Parameters on Bacterial Community in a Full-Scale Municipal Wastewater Treatment Plant

2012 ◽  
Vol 61 (1) ◽  
pp. 41-49 ◽  
Author(s):  
AGNIESZKA CYDZIK-KWIATKOWSKA ◽  
MAGDALENA ZIELIŃSKA ◽  
IRENA WOJNOWSKA-BARYŁA
Keyword(s):  
Wastewater Treatment ◽  
Bacterial Community ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Organic Load ◽  
Municipal Wastewater Treatment ◽  
Load Rate ◽  
Organic Load Rate ◽  
Ammonia Oxidising Bacteria

A bacterial community in activated sludge from a full-scale municipal wastewater treatment plant was monitored throughout the year with the use of FISH, RISA and DGGE techniques. In the investigated range of temperatures (11.9-21.6 degrees C), a rise in temperature resulted in a lower total bacteria richness, while organic load rate changes from 0.09 to 0.21 g COD x g TSS(-1) x d(-1) were positively correlated with the number of bands in RISA patterns. The most diverse pattern (29 different bands) was characteristic for the activated sludge sample collected at the end of January at wastewater temperature of 11.9 degrees C. The ammonia-oxidising bacteria community did not change during the study, and comprised of 4 different bacterial populations with one dominant species closely related to Nitrosospira sp. REGAU (GenBank accession number AY635572.1). The percentage of ammonia-oxidising bacteria in the activated sludge varied from 6.2 to 19.5% and depended on temperature (R = 0.61, p = 0:02) and organic load rate (R = -0.55, p = 0.04).

Municipal Sources of Selected Trace Organics in Sarnia

1986 ◽  
Vol 21 (3) ◽  
pp. 422-432 ◽  
Author(s):  
Jiri Marsalek
Keyword(s):  
Wastewater Treatment ◽  
Treatment Plant ◽  
Urban Runoff ◽  
Systematic Evaluation ◽  
Drainage Ditch ◽  
Trace Organics ◽  
Treated Effluent ◽  
Industrial Sources ◽  
Low Levels ◽  
Wastewater Treatment Plant Effluent

Abstract As a contribution to the systematic evaluation of sources of selected trace organics discharged into the St. Clair River in Sarnia, municipal sources, such as urban runoff, drainage ditch flow and wastewater treatment plant effluent, were evaluated. The sampling of these sources indicated the presence of trace organics at fairly low levels. The treated effluent conveyed the highest loadings of perchloroethylene (560 kg/yr) and carbon tetrachloride (4 kg/yr). The drainage ditch receiving some industrial discharges conveyed the highest loadings of hexachlorobutadiene (9 kg/yr) and hexachloroethane (2 kg/yr). The annual loadings of pentachlorobenzene, hexachlorobenzene and octachlorostyrene were smaller than 0.1 kg/yr. The loadings from municipal sources were found insignificant in comparison to those from industrial sources.

Odour emission estimates and control strategies using models and sampling for East Bay Municipal Utility District's collection sewage system and wastewater treatment plant

2000 ◽  
Vol 41 (6) ◽  
pp. 65-71
Author(s):  
J. R. Witherspoon ◽  
A. Sidhu ◽  
J. Castleberry ◽  
L. Coleman ◽  
K. Reynolds ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Model Comparison ◽  
Control Strategies ◽  
Treatment Plant ◽  
Sewage System ◽  
Control Options ◽  
East Bay ◽  
Odour Control ◽  
Odour Emissions

For several years, public complaints regarding odours generated by East Bay Municipal Utility District's (EBMUD's) wastewater treatment plant and sewage collection system (SCS) have been increasing. In response, an Odor Control Master Plan was completed to develop near- and long-term odour abatement strategies for their wastewater system. The plan's strategies include using an advisory committee to assist in setting odour threshold levels, prioritizingodour sources, issuing an odour-status newsletter, and reviewing odour control options. The objective is to provide an odour-free community environment at least 99 percent of the year. This paper provides innovative approaches to estimate odour emissions and identify viable odour control options for SCSs through complete wastewater treatment. This paper also presents a CH2M HILL SCS odour model comparison to a comprehensive EBMUD sewage system corrosion study, illustrating that areas having high predicted odours also have high corrosion rates.

Assessing effluent fluoride concentrations following physicochemical wastewater treatment

1992 ◽  
Vol 19 (4) ◽  
pp. 649-659 ◽  
Author(s):  
R. Gehr ◽  
R. Leduc
Keyword(s):  
Drinking Water ◽  
Wastewater Treatment ◽  
Fluoride Concentration ◽  
Treatment Plant ◽  
Full Scale ◽  
Untreated Wastewater ◽  
Balance Analysis ◽  
Full Scale Tests ◽  
St Lawrence River ◽  
Raw Wastewater

The anticipated fluoride concentrations in untreated wastewater, as well as their removal during physicochemical treatment, were determined in order to assess potential risks to the aquatic ecosystem of the St. Lawrence River due to proposed fluoridation of Montreal's drinking water. Monitoring of the raw wastewater yielded average daily fluoride concentrations of 0.22–0.58 mg/L, but discrete sample concentrations ranged from 0.20 to 1.11 mg/L. This indicates that significant massive point discharges occur in the Montreal Urban Community (MUC) sewer system. Jar tests suggest that no precipitation of fluoride would occur following ferric chloride and polyelectrolyte addition at doses similar to those used on the full-scale wastewater treatment plant. This is confirmed by thermodynamic analysis of the solubility of various fluoride species. Full-scale tests, conducted by applying a continuous fluoride dose to the plant influent, confirmed that no removal would result from the treatment process. However, the plant did dampen the shock loads of fluoride from industrial sources. The predicted average raw wastewater fluoride concentration, including ground water and unidentified industrial discharges, was calculated to be 0.83 mg/L. Unidentified sources contribute 132 kg/d (~ 40% of the total). The average fluoride flux in the St. Lawrence River, as a result of fluoridation of the drinking water, would increase by 1.2%. Key words: fluoridation, physicochemical wastewater treatment, St. Lawrence River, mass balance analysis.

scholarly journals Gross Solids Content Prediction in Urban WWTPs Using SVM

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 442
Author(s):  
Vanesa Mateo Pérez ◽  
José Manuel Mesa Fernández ◽  
Francisco Ortega Fernández ◽  
Joaquín Villanueva Balsera
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Support Vector ◽  
Preliminary Treatment ◽  
Untreated Wastewater ◽  
Initial Stage ◽  
Plant Operations ◽  
Input Variables ◽  
Solids Content

The preliminary treatment of wastewater at wastewater treatment plants (WWTPs) is of great importance for the performance and durability of these plants. One fraction that is removed at this initial stage is commonly called gross solids and can cause various operational, downstream performance, or maintenance problems. To avoid this, data from more than two operation years of the Villapérez Wastewater Treatment Plant, located in the northeast of the city of Oviedo (Asturias, Spain), were collected and used to develop a model that predicts the gross solids content that reaches the plant. The support vector machine (SVM) method was used for modelling. The achieved model precision (Radj2 = 0.7 and MSE = 0.43) allows early detection of trend changes in the arrival of gross solids and will improve plant operations by avoiding blockages and overflows. The results obtained indicate that it is possible to predict trend changes in gross solids content as a function of the selected input variables. This will prevent the plant from suffering possible operational problems or discharges of untreated wastewater as actions could be taken, such as starting up more pretreatment lines or emptying the containers.

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