scholarly journals EXPERIMENTAL STUDIES OF BIOCHEMICAL GAS TREATMENT IN THE WORKING AREA OF CLOSED WASTEWATER TREATMENT PLANTS

2021 ◽  
Vol 112 ◽  
pp. 25-28
Author(s):  
V.Yu. Belousova ◽  
◽  
N.V. Kondakova ◽  
S.N. Reznikova ◽  
N.S. Serpokrilov ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Sulfur Dioxide ◽  
Wastewater Treatment Plants ◽  
Experimental Studies ◽  
Filter Material ◽  
Biologically Active ◽  
Technological Parameters ◽  
Biochemical Purification ◽  
Gas Treatment ◽  
High Concentrations

The results of the study of gas emissions from blocked wastewater treatment plants are presented. During the experiment, high concentrations of sulfur dioxide were detected. The analysis of methods for reducing the concentration of pollutants in the air of the working area of the aeration station was carried out. It is proposed to use a biochemical purification using a biofilter with a load of bark and biohumus. A model of the installation was constructed. To determine the technological parameters of the biofilter considered different types of combinations (height, moisture, particle size) of the carrier biomass and supporting layer of gravel, the effective processing time of the gas mixture. A decrease in sulfur dioxide, hydrogen sulfide, and formaldehyde was found. Additional advantages of the applied biologically active filter material are given.

Quality improvement of biosolids by ferrate(VI) oxidation of offensive odour compounds

1996 ◽  
Vol 33 (3) ◽  
pp. 119-130 ◽  
Author(s):  
Allen C. Chao ◽  
Sergio J. de Luca ◽  
Carlos N. Idle
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Potassium Ferrate ◽  
Sulphur Compounds ◽  
Environmental Recovery ◽  
Oxidizing Power ◽  
Aldehydes And Ketones ◽  
High Concentrations ◽  
By Products

Studies concerning the treatment, stabilization and final disposal of biosolids, one of the by-products of wastewater treatment, in environmental recovery, have been intensified by the sanitary and environmental effects of land disposal. The careful assessment of biosolid quality shows that, when appropriately managed, the environmental risks of their uses can be minimized by chemical stabilization, and biosolids could even be used as fertilizer and soil conditioner. A research study of biosolid stabilization was performed using lime as a standard process compared to potassium ferrate (VI). The chances of leaching and solubilization of metals were tested, simulating conditions for disposal in the environment. The sanitary effectiveness in terms of pathogens (bacteria, fungi and helminth eggs) were also evaluated. Experiments were performed on the lime and ferrate(VI) treatment of compounds such as ammonia, nitrate, soluble sulphides, and total sulphates, indicators of odouriferous offensive compounds which might occasionally prevent some uses of the solids, and the results are presented in this paper. Wastewater Treatment Plants emit offensive odours generated during the sewage treatment process, as well as during the treatment and the management of biosolids. This occurs in the drying beds and the spreading of biosolids on land, due to the high concentrations of sulphur compounds, nitrogen compounds, acids and organic compounds (aldehydes and ketones). The potassium ferrate(VI) utilized in the research is a powerful oxidizing agent throughout the pH scale, with the advantage of not generating by-products which will cause toxicity or mutagenicity (DE LUCA, 1981). The ion ferrate(VI) has greater oxidizing power than permanganate, e.g., it oxidizes reduced sulfur forms to sulphate, ammonia to nitrate, hypochlorite to chlorite and chlorite to chlorate(DE LUCA et al., 1992; CHAO et al., 1992). This paper shows that, as expected, the potassium ferrate (VI) treatment replaces several chemical products utilized for odour control of sludges, mainly aggressive odours caused by ammonia and sulphides, through the formation of precipitates with iron compounds. Ferrate (VI) has often been shown to destroy soluble sulphides, transforming them into sulphate. The generation of oxygen in the decomposition of ferrate(VI) increases its oxidizing power. Ferrate(VI) applied to sludges also has the double effect of transforming ammonia into nitrates, such that this product takes the place of sulphates, acting as an electron acceptor, thus preventing the development of further odours when biosolids are utilized.

scholarly journals ANN-Based Soft Sensor to Predict Effluent Violations in Wastewater Treatment Plants

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1280 ◽  
Author(s):  
Ivan Pisa ◽  
Ignacio Santín ◽  
Jose Vicario ◽  
Antoni Morell ◽  
Ramon Vilanova
Keyword(s):  
Wastewater Treatment ◽  
Short Term Memory ◽  
Wastewater Treatment Plants ◽  
Control Strategies ◽  
False Positive Rate ◽  
Soft Sensor ◽  
Aquatic Life ◽  
Pollutant Concentrations ◽  
High Concentrations ◽  
Artificial Neural Network Ann

Wastewater treatment plants (WWTPs) form an industry whose main goal is to reduce water’s pollutant products, which are harmful to the environment at high concentrations. In addition, regulations are applied by administrations to limit pollutant concentrations in effluent. In this context, control strategies have been adopted by WWTPs to avoid violating these limits; however, some violations still occur. For that reason, this work proposes the deployment of an artificial neural network (ANN)-based soft sensor in which a Long-Short Term Memory (LSTM) network is used to generate predictions of nitrogen-derived components, specifically ammonium ( S N H ) and total nitrogen ( S N t o t ). S N t o t is a limiting nutrient and can therefore cause eutrophication, while nitrogen in the S N H form is toxic to aquatic life. These parameters are used by control strategies to allow actions to be taken in advance and only when violations are predicted. Since predictions complement control strategies, the evaluation of the ANN-based soft sensor was carried out using the Benchmark Simulation Model N.2. (BSM2) and three different control strategies (from low to high control complexity). Results show that our proposed method is able to predict nitrogen-derived products with good accuracy: the probability of detecting violations of BSM2’s limits is 86%–94%. Moreover, the prediction accuracy can be improved by calibrating the soft sensor; for example, perfect prediction of all future violations can be achieved at the expense of increasing the false positive rate.

scholarly journals Fate and mass loading of antibiotics in hospital and domestic wastewater treatment plants in Bangkok, Thailand

2021 ◽  
Author(s):  
Donwichai Sinthuchai ◽  
Suwanna Kitpati Boontanon ◽  
Pitchaya Piyaviriyakul ◽  
Narin Boontanon ◽  
Ranjna Jindal ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
High Performance ◽  
Wastewater Treatment Plants ◽  
Solid Phase ◽  
Domestic Wastewater ◽  
Middle Income ◽  
Inappropriate Use ◽  
Effective Removal ◽  
Liquid Chromatography Tandem Mass ◽  
High Concentrations

Abstract Excessive and inappropriate use of antibiotics contributes to the spread of antibiotic resistance in the environment, especially in low- to middle-income countries. This study investigated the occurrence, relative abundance, and fate of eight antibiotics at each treatment stage in four domestic and four hospital wastewater treatment plants (dWWTPs and hWWTPs, respectively), as well as mass loadings into the receiving water environments in Bangkok, Thailand. Samples were prepared by solid-phase extraction and analyzed by high-performance liquid chromatography–tandem mass spectrometry. Antibiotic concentrations were higher in hWWTPs than dWWTPs; approximately 60 times for influents and 10 times for effluents. Ciprofloxacin concentration increased in most dWWTPs, especially in the aeration unit and return sludge, suggesting that it predominantly occurred in the solid phase. Sulfamethoxazole predominantly occurred in the dissolved form, which is more difficult to degrade, and exhibited high concentrations in effluent. Moreover, antibiotic pollutant loadings were approximately 30–3,530 times higher from dWWTPs than from hWWTPs due to higher daily discharges from the domestic sector. These plants are a major point source of antibiotic residue release to aquatic environments; thus, their efficiency should be improved by incorporating advanced treatment processes to ensure effective removal of antibiotics.

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 Ecological Risk Assessment of Five Endocrine-Disrupting Compounds in Wastewater Treatment Plants from Monterrey, Mexico

2021 ◽  
Author(s):  
Khirbet López-Velázquez ◽  
Jorge L. Guzmán-Mar ◽  
Hugo A. Saldarriaga-Noreña ◽  
Mario A. Murillo-Tovar ◽  
Minerva Villanueva-Rodríguez
Keyword(s):  
Wastewater Treatment ◽  
Ecological Risk ◽  
Wastewater Treatment Plants ◽  
Endocrine Disrupting Compounds ◽  
Potential Ecological Risk ◽  
Endocrine Disrupting ◽  
17Β Estradiol ◽  
High Concentrations ◽  
Wastewater Samples ◽  
Hazardous Compounds

Abstract The potential ecological risk of five residual endocrine-disrupting compounds (EDCs) in four wastewater treatment plants (WWTPs) was studied. The wastewater samples were collected in WWTPs of the Metropolitan Area of Monterrey, Mexico (designed as Monterrey City hereinafter) and 17β-estradiol (E2), 17α-ethinylestradiol (EE2), bisphenol A (BPA), 4-nonylphenol (4NP), and 4-tert-octylphenol (4TOP) were studied by SPE/GC-MS method. Results showed that all EDCs are widely distributed in WWTPs, finding high concentrations of BPA (450 ng/L) and EE2 (407.5 ng/L) in influents, while EE2 and 4TOP were the most abundant in effluents at levels from 1.6–26.8 ng/L (EE2) and < LOQ – 5.0 ng/L (4TOP), which corroborate that the wastewater discharges represent critical sources of EDCs to the aquatic environments. The potential ecological risk of residual EDCs was evaluated through risk quotients (RQs), and results indicated that the effluents of the WWTPs represent a high risk to exposed aquatic species, mainly due to the effect of residual estrogens E2 and EE2 which were considered as the most hazardous compounds among the studied EDCs, with RQ values up to 49.1 and 1165.2, respectively.

scholarly journals Nationwide SARS-CoV-2 Surveillance Study for Sewage and Sludges of Wastewater Treatment Plants in Turkey

2020 ◽  
Author(s):  
Bilge Alpaslan Kocamemi ◽  
Halil Kurt ◽  
Ahmet Sait ◽  
Hamza Kadi ◽  
Fahriye Sarac ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Published Data ◽  
Virus Concentration ◽  
Surveillance Studies ◽  
Infected People ◽  
Medical Tests ◽  
The World ◽  
High Concentrations ◽  
All Treatment

1.AbstractSince the announcement of the pandemic of Covid-19 by WHO on March 11, 2020, the countries have started to monitor surveillance of SARS-CoV-2 through medical tests. However, people with no and very light symptoms are usually not medically tested or never hospitalized and they are missed. In the study of Wu et al. [1], it was realized that the urine and faeces of all infected people contain SARS-CoV-2. After that, sewage, and sludge-based SARS-CoV-2 surveillance studies have gained significant importance around the world (Fig.1). SARS-CoV-2 was detected in wastewaters in The Netherlands [2,3,4], USA [1,5,6,7, 8, 9, 10], Australia [11], France [12, 13, 14], China [15], Spain [16,17,18,19,20], Italy [21, 22,23], Israel [24], Turkey[25], Germany[26], Japan [27,28], India [29,30], Pakistan [31], Brazil [32,33], Chile [34], Denmark, France, Belgium[35], Equator [36] and Sweden [37] using different virus concentration techniques. Published data show that high concentrations of the SARS-CoV-2 RNA reaches to wastewater treatment plants (WWTPs). On 7th of May 2020, Turkey took its place among a few country which have been started wastewater based surveillance studies at the early stages of pandemic by reporting SARS-CoV-2 RT-qPCR levels of major WWTPs of Istanbul [25]. Turkey [38] first detected SARS-CoV-2 in both primary and waste activated sludges of Istanbul WWTPs. Later, USA [39] and Spain [40] were also studied on sludge samples. There are also studies evaluating the SARS-CoV-2 in WWTPs effluents [10,13,14, 28, 29,30, 34, 36].This study aimed to scan distribution of Covid-19 through Turkey by SARS-CoV-2 measurements in influent, effluent and sludge samples of WWTPs. The influent, effluent and sludge samples were collected from main WWTPs located in 81 cities of Turkey through May 2020-July 2020. Among those 81 cities, Istanbul metropole with 15.5 million inhabitants was chosen as the pilot city since 65% of all cases in Turkey were present here. Hence, all treatment plants in Istanbul were scanned through the study. The viral activity tests were also conducted for the influent, effluent and sludge samples resulting high qPCR.

scholarly journals Odour measurement in wastewater treatment plant using both European and Japanese standardized methods: correlation and comparison study

2016 ◽  
Vol 18 (4) ◽  
pp. 728-733 ◽  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
International Standards ◽  
Municipal Wastewater Treatment ◽  
Odour Concentration ◽  
High Concentrations ◽  
The University

<p>Odours discharged from wastewater treatment plants generally cause severe damage to locals. When facility odors affect air quality and cause citizen complaints, an investigation of those odours may require using standardized scientific methods. Odour intensity is one of the main odour characterization parameter, and represents an important sensory indicator of environmental odours.</p> <p>Presently, different international standards have been developed for the measurement of odours. Main consolidated methods are the measurement of odour index assessed by panelists, standardized in Japan and developed there more than 40 years ago; and the measured of odour concentration by dynamic olfactometer according to European standard EN13725:2003.</p> <p>In this study odour samples were collected on a municipal wastewater treatment plant to investigate the relationship between odour index assessed by Japanese standard methods and odour concentration measured with dynamic olfactometry. A monthly sampling and relative odour measurement were carried out for consecutive 8 months at the Laboratory of the Sanitary Environmental Engineering Division (SEED) at the University of Salerno (Italy).</p> <p>Results show a strong linear correlation between the two investigated odour measurement methods, in the case of the measurement of high concentrations. While at lower odour concentrations were observed a difference between the two methods.</p>

Benchmarking of BAF plants: operational experience on 40 full-scale installations in Germany

2007 ◽  
Vol 55 (8-9) ◽  
pp. 91-98 ◽  
Author(s):  
M. Barjenbruch
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Filter Material ◽  
Operational Experience ◽  
Municipal Wastewater Treatment ◽  
Biological Purification ◽  
Purification Methods ◽  
Municipal Wastewater Treatment Plants ◽  
Energy Balances

For some years, bio-filtration has been used in municipal wastewater treatment as a relatively new method. Within a German DWA research project, the method of benchmarking was used to compile and scientifically evaluate performance data and operation experiences with this technology on municipal wastewater treatment plants in Germany. This report presents selected partial results from the project. Generally, it becomes apparent that bio-filters as supplementary technology allow for additional improvements in regard to the COD and nitrogen effluent values. Bio-filtration is a compact method which combines biological purification processes with the filtration process. Apart from sound results in regard to the operation costs, operational problems (MSR technology, filter material losses) are described. In terms of energy balances, dimensions of the biological main stages can be compared to other biological purification methods. In regard to the sludge production, further research is necessary.

Odour assessment: determining the optimum temperature and time for Tedlar sampling bag pre-conditioning

2012 ◽  
Vol 66 (8) ◽  
pp. 1806-1811 ◽  
Author(s):  
A. H. Bokowa
Keyword(s):  
Wastewater Treatment ◽  
Flow Rate ◽  
Wastewater Treatment Plants ◽  
Experimental Studies ◽  
Cleaning Process ◽  
Optimum Temperature ◽  
Air Flow Rate ◽  
Volatile Organic ◽  
Temperature Controlled ◽  
The Impact

Odours present in new Tedlar bags can impact the assessment of emissions from sewer collection systems and wastewater treatment plants. Conditioning protocols are needed to minimise the impact of background materials emissions on the sampling and assessment of odourous emissions. Olfactometry analysis has shown that background odour concentrations for new Tedlar bags can be as high as 130 OUE/m3. Experimental studies were undertaken to investigate the impact of different conditioning temperatures in order to determine the optimum temperature for cleaning new Tedlar bags to a level when no detectable odours were present in the sampling bags via dilution olfactometry. For the purpose of this study, new Tedlar bags were cleaned in a temperature-controlled oven that had a constant filtered air flow-rate. From the analysis of odour and volatile organic compounds (VOCs) concentrations found in new Tedlar bags during the cleaning process, it was observed that odour and VOCs concentrations decreased with time. It was also found that the temperature setting plays a significant role in the cleaning of the Tedlar bags as large concentrations of phenols and acetamide, N,N-dimethyl were found in new Tedlar bags and their concentrations decreased following the temperature pre-conditioning.

scholarly journals Modern methods for surface wastewater treatment

2018 ◽  
Vol 178 ◽  
pp. 09020
Author(s):  
Oleg Primin ◽  
Galina Varyushina
Keyword(s):  
Wastewater Treatment ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Local Treatment ◽  
Sewage Water ◽  
Technological Parameters ◽  
Surface Water Treatment ◽  
State Of Water ◽  
Treatment Facilities ◽  
Technical Solutions

The article gives the characteristics of the system of removal and purification of surface wastewater in Moscow. One of the features of this system is the large-scale use of hydrographic network of the city as elements of the drainage network. Currently improvement of the ecological state of water objects is only possible if to reduce anthropogenic load on them and watersheds, to recover self-cleaning abilities of water bodies and the to protect groundwater from contamination. The article reveals results of research, and contains technological parameters for facilities of surface sewage water purification and recommendations to improve their operation. Article also gives technical solutions to upgrade operated wastewater treatment systems and to ensure the achievement of required standards of treatment of surface runoff when dilution in water. Along with proposals for the reconstruction and construction of wastewater treatment plants with the classical technology of surface water treatment, it is necessary to consider the principle of decentralization with the use of local treatment facilities.

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