Strategies for the reduction of Legionella in biological treatment systems

2016 ◽  
Vol 74 (4) ◽  
pp. 816-823 ◽  
Author(s):  
R. Nogueira ◽  
K.-U. Utecht ◽  
M. Exner ◽  
W. Verstraete ◽  
K.-H. Rosenwinkel
Keyword(s):  
Legionella Pneumophila ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Cooling System ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Micro Particles ◽  
Treated Effluent ◽  
Wastewater Stream ◽  
Insight Into

A community-wide outbreak of Legionnaire's disease occurred in Warstein, Germany, in August 2013. The epidemic strain, Legionella pneumophila Serogruppe 1, was isolated from an industrial wastewater stream entering the municipal wastewater treatment plant (WWTP) in Wartein, the WWTP itself, the river Wäster and air/water samples from an industrial cooling system 3 km downstream of the WWTP. The present study investigated the effect of physical–chemical disinfection methods on the reduction of the concentration of Legionella in the biological treatment and in the treated effluent entering the river Wäster. Additionally, to gain insight into the factors that promote the growth of Legionella in biological systems, growth experiments were made with different substrates and temperatures. The dosage rates of silver micro-particles, hydrogen peroxide, chlorine dioxide and ozone and pH stress to the activated sludge were not able to decrease the number of culturable Legionella spp. in the effluent. Nevertheless, the UV treatment of secondary treated effluent reduced Legionella spp. on average by 1.6–3.4 log units. Laboratory-scale experiments and full-scale measurements suggested that the aerobic treatment of warm wastewater (30–35 °C) rich in organic nitrogen (protein) is a possible source of Legionella infection.

On-line microwave total solids sensoring in sewage characterization

2009 ◽  
Vol 59 (7) ◽  
pp. 1291-1297
Author(s):  
H. Poutiainen ◽  
S. Laitinen ◽  
P. Juntunen ◽  
H. Heinonen-Tanski
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Organic Load ◽  
Measured Signal ◽  
Municipal Wastewater Treatment ◽  
Wastewater Treatment Process ◽  
Total Solids ◽  
Wastewater Stream ◽  
On Line

We describe a novel application for a microwave on-line sensor to measure the total solids (TS) load entering a municipal wastewater treatment plant (WWTP) from slaughterhouse sewage and some sanitary wastewaters. Measuring this kind of wastewater stream is very challenging, because it contains a high, but varying organic load with nitrogen, phosphorus and microorganisms. The reliability of the measured signal was studied by comparison with laboratory analyses and a correlation is presented of TS-value with other parameters that are typically followed in a wastewater treatment process. The results suggest that on-line microwave sensoring could be used to monitor total solids in wastewater influent. Our results show that the on-line microwave sensor and laboratory reference analyses give similar results with a good correlation between the two techniques. Furthermore, we demonstrate that the total solids values correlate well with conductivity, total nitrogen and BOD7 values but not with phosphorus, pH and temperature.

scholarly journals Sewage sludge utilization for the municipality of Gdansk

2019 ◽  
pp. 169-177
Author(s):  
Ewa Sienkiewics ◽  
Piotr Kowalik ◽  
Stanislav Drzewinski ◽  
Klemens Herman
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Land Reclamation ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Waste Dump ◽  
Treatment Technology ◽  
Phosphorus Extraction ◽  
Near Future

In the municipal wastewater treatment plant in Gdansk a biological treatment technology allowing removing of nutrients was launched recently. This will result in increasing of the volume of sludge from 27.3 t d.m./d now to about 45 t d.m./d in the near future. The analysis of various possibilities of sludge utilization was made. It was concluded that incineration of the sludge seems to be the most promising method, while the possibilities of application of sludge in agriculture, forestry or to land reclamation are limited. Therefore it is suggested that 90% of sludge should be incinerated and the remaining 10% - stabilized with lime and applicated to land reclamation. The ahses generated during the incineration of sludge should be deposited at the municipal waste dump, with possible phosphorus extraction in the future.

Estimation of Biodegradation and Liquid-Solid Partitioning Coefficients for Selected PAHs in Municipal Wastewater Treatment

2009 ◽  
Vol 44 (2) ◽  
pp. 166-173
Author(s):  
Wayne J. Parker ◽  
Hugh D. Monteith ◽  
Vince Pileggi
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Rate Coefficients ◽  
Model Parameters ◽  
Municipal Wastewater Treatment ◽  
Biodegradation Rate ◽  
Wastewater Stream ◽  
Partitioning Coefficients

Abstract Batch testing was employed to estimate model parameters that are required for predicting the fate of polynuclear aromatic hydrocarbons (PAHs) in wastewater treatment. Linear partitioning was found to describe the partitioning of PAHs to solids and was best described when the soluble phase of the PAHs was determined by centrifugation alone. The liquid-solid partitioning coefficients obtained for primary and secondary sludges were statistically different, with the latter being higher than the former for most of the PAHs examined in this study. Temperature had a significant impact on the estimated biodegradation rate coefficients (Kb). The biodegradation rate coefficients for anthracene and phenanthrene (three-ring PAHs) were statistically different from benzo(a)anthracene and chrysene (four-ring PAHs). The presence of a nitro-adduct on acenaphthene resulted in a substantial increase in the Kb relative to the unsubstituted anthracene and phenanthrene. A sensitivity analysis revealed that the removal of PAHs in a full-scale wastewater treatment plant was most sensitive to the value of the liquid-solid partitioning coefficients. Approximately 60% of the PAHs were removed from the wastewater stream through partitioning to both primary and secondary solids, and subsequent discharge.

scholarly journals Implementing Solutions for Muskrat Lake

2016 ◽  
Vol 2 (1) ◽  
pp. 7-11
Author(s):  
Wilson Ho
Keyword(s):  
Biological Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Test Site ◽  
Agricultural Runoff ◽  
Municipal Wastewater Treatment ◽  
Wastewater Remediation ◽  
Short Term ◽  
Nitrogen And Phosphorus ◽  
Water Speed

Muskrat Lake has recently been suffering from nutrient overloading due to unknown causes. The purpose of this investigation is to determine where excess nutrients are concentrated in the Muskrat Lake watershed, to monitor their levels over a six-week period, and to test the BioCord Reactor as a novel solution. The reactor is commonly used in man-made wastewater remediation systems to increase the level of biological treatment, and decrease concentrations of nitrogen and phosphorus. Collection bottles were rinsed three times at each collection site before samples were taken and shipped to the Canadian Nuclear Laboratories and the Ministry of Environment for analysis, or brought back to the lab. Lab equipment was purchased from HACH Industries, and the HACH TNT Kit 843 procedure was slightly modified to scan for an ultra-low level of phosphorus. Overall, the results suggest that agricultural runoff, the mixed wood forests, and the municipal wastewater treatment plant do not have significant impacts on the watershed, but more analysis is necessary before any definitive conclusions can be drawn. Furthermore, the BioCord Reactor was shown to be ineffective at the test site due to low rainfall, water depth, and water speed. More sites need to be analyzed for a longer period of time in order to determine if this technology is feasible as a short-term remediation tool for eutrophication.

scholarly journals Evaluation of operation and management of Luocheng small municipal wastewater treatment plant

2020 ◽  
Vol 194 ◽  
pp. 04009
Author(s):  
Qiaoquan Wei ◽  
Guanwen Cheng ◽  
Bangzhou Sun ◽  
Liao Zhang ◽  
Yuling Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plant ◽  
Treated Effluent ◽  
Operation Rate ◽  
Operation And Management

Operation efficiency, effect and operation energy consumption are the main basis for the evaluation of the operation and management level of wastewater treatment plant. The statistics of the operation data of the small municipal wastewater treatment plant in Luocheng County show that the operation rate of the facility is high, and the treated effluent reaches the Level A standard of the “Discharge standard of pollutants for municipal wastewater treatment plant” (GB18918-2002), and the various evaluation indicators of the urban wastewater treatment plant basically normal. However, the average operating load of some municipal wastewater treatment plant has not reached the index requirement for the operation period of production, and the load rates of CODCr and NH4+-N are mostly below 60%, and wastewater treatment plant unit wastewater volume, unit CODCr and NH4+-N load energy consumption is high. The reason is that the water quality of the design of the micro-municipal wastewater treatment plant is not reasonable, the construction scale is too large, and the operation fails to adopt effective management and control technology measures.

scholarly journals Effectiveness and Energy Requirements of Pasteurisation for the Treatment of Unfiltered Secondary Effluent from a Municipal Wastewater Treatment Plant

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2100
Author(s):  
Peter Sanciolo ◽  
Paul Monis ◽  
Justin Lewis ◽  
Greg Ryan ◽  
Andrew Salveson ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Heat Exchangers ◽  
Municipal Wastewater ◽  
Waste Heat ◽  
Treatment Plant ◽  
Economic Feasibility ◽  
Secondary Effluent ◽  
Heat Sensitivity ◽  
Municipal Wastewater Treatment ◽  
Treated Effluent

Pasteurisation was investigated as a process to achieve high microbial quality standards in the recycling of water from unfiltered secondary effluents from a wastewater treatment plants in Melbourne, Australia. The relative heat sensitivity of key bacterial, viral, protozoan and helminth wastewater organisms (Escherichia coli, Enterococcus, FRNA bacteriophage, adenovirus, coxsackievirus, Cryptosporidium, and Ascaris) were determined by laboratory scale tests. The FRNA phage were found to be the most heat resistant, followed by enterococci and E. coli. Pilot scale challenge testing of a 2 ML/day pasteurisation pilot plant using unfiltered municipal wastewater and male specific coliphage (MS2) phage showed that temperatures between 69 °C and 75 °C achieved log reductions values between 0.9 ± 0.1 and 5.0 ± 0.5 respectively in the contact chamber. Fouling of the heat exchangers during operation using unfiltered secondary treated effluent was found to increase the energy consumption of the plant from 2.2 kWh/kL to 5.1 kWh/kL. The economic feasibility of pasteurisation for the current municipal application with high heat exchanger fouling potential can be expected to depend largely on the available waste heat from co-generation and on the efforts required to control fouling of the heat exchangers.

Biological Nutrient Removal in a Single-Sludge Plant

1993 ◽  
Vol 27 (7-8) ◽  
pp. 63-70 ◽  
Author(s):  
D. Farchill ◽  
M. Goldstein ◽  
A. Kanarek ◽  
A. Aharoni
Keyword(s):  
Phosphorus Removal ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Biological Nutrient Removal ◽  
Automatic Process ◽  
Carbon Oxidation ◽  
Municipal Wastewater Treatment ◽  
Automatic Process Control ◽  
A Current

Single-sludge biological treatment systems for nitrification-denitrification and phosphorus removal have become widely accepted process options due to the increasingly greater demand for effluent nutrient control. The Soreq Biological Treatment Plant is a regional facility for municipal wastewater treatment and effluent reclamation for irrigation purposes, with a current average capacity of 220,000 m3/day. The performance data presented for one full year of operation (1989-1990) under automatic process control indicate consistently high rates of carbon oxidation, nitrification-denitrification and enhanced phosphorus removal.

Optimization of phosphorus removal in secondary effluent using immersed ultrafiltration membranes with in-line coagulant pretreatment — implications for advanced water treatment and reuse applicationsA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (7) ◽  
pp. 1272-1283 ◽  
Author(s):  
Joel Citulski ◽  
Khosrow Farahbakhsh ◽  
Fraser Kent
Keyword(s):  
Ferric Chloride ◽  
Water Reuse ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Hollow Fibre ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Ferrous Chloride ◽  
Treated Effluent ◽  
Pre Treatment

In-line addition of alum and ferric chloride was conducted at a hollow-fibre immersed ultrafiltration (UF) membrane pilot plant, using secondary effluent from a municipal wastewater treatment plant (WWTP) as the feed. The objective of such pretreatment was to remove phosphorus from the feed from an initial concentration of approximately 5 mg/L to below 0.3 mg/L. The simplified in-line coagulant addition process involved hydraulic mixing of the coagulant into the feed and subsequent flocculation, and a greatly reduced (12–14 min) flocculation time relative to conventional coagulation-flocculation-settling treatment. Both alum and ferric chloride effectively removed phosphorus to below the 0.3 mg/L threshold when applied as a pretreatment at optimized doses, both of which were below the WWTP’s current coagulant dose (as ferrous chloride). This simplified pre-treatment scheme provided consistent enhanced removal of phosphorus and organic compounds. These results suggest that simplified in-line coagulant addition in advance of immersed UF membranes enhances the ability to produce treated effluent suitable for water-reuse applications.

Study on Species and Distribution of Volatile Organic Compounds in WWTP

2013 ◽  
Vol 864-867 ◽  
pp. 2035-2038 ◽  
Author(s):  
Li Kun Huang ◽  
Guang Zhi Wang
Keyword(s):  
Organic Compounds ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Chlorinated Hydrocarbon ◽  
Volatile Organic ◽  
Benzene Toluene ◽  
Main Components ◽  
Biological Treatment Process

This study carried on a qualitative analysis on emission and distribution of VOCs and quantitative analysis on BTEX and chlorinated hydrocarbon emitted from a municipal wastewater treatment plant (WWTP). At the same time, the variations of BETX and chlorinated hydrocarbon in three-phases in the biological treatment process in lab-scale were investigated. Results revealed that the low molecular weight hydrocarbon, BTEX (benzene, toluene, xylene) and chlorinated hydrocarbons (chloroform, carbon tetrachloride, chlorylene, tetrachloroethylene) were the main components of VOCs. Primary clarifier volatilized thirty-three species of VOCs, which was most in the WWTP. The remaining organic compounds in this unit belonged to refractory organics that was hardly decomposed by microbe. The more complex aromatic compounds in VOCs were detected.

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