scholarly journals A Study on the Control of Attached Algae by Installing the Drainage Cover Device for the Final Sedimentation of Sewage Treatment Plant

2021 ◽  
Vol 43 (4) ◽  
pp. 265-273
Author(s):  
Sun Whae Lim ◽  
Cheol Hyeon Jang ◽  
Byong Ro Ryu ◽  
Yong Soon Lee
Keyword(s):  
Adhesion Force ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Economic Feasibility ◽  
Drainage Channel ◽  
Attached Algae ◽  
Before And After ◽  
Final Effluent

Objectives : Adherent algae which are generated in the final sedimentation weir of the sewage treatment plant and the drainage channel, affect the quality of the final effluent water, and it has bad aesthetic effect due to fomation of flcok floating in the sedimentation tank. Therefore, the purpose of this study is prevention of the growth of adherent algae in advance by installing circular cover on the final sedimentation weir and drainage channels.Methods : In this study, we compared the growth pattern of adhered algae on weir and drainage channels before and after installation of circular cover at the final sedimentation weir and drainage channel of the sewage treatment plant. In addition, to identity species of attached algaem microscopic observation was applied, and ch-a concentration was analyzed to confirm the quality of the final effluent water.Results and Discussion : Then, we compared the results before and after installation of cover to check adhesion status of algae on the surface of final sedimentation drain. In case without cover, it was confirmed by observing the growth of attached algae under normal condition with air and photosynthetic reaction, and in case with cover, it was compared with opening after a certain period of time after installation of the drainage cover. As a result of the comparison, it was confirmed that a lot of attached algae occurred in the sedimentary weir and the drain. From the above results, the occurrence of final sedimentation algae is not only affected by the material and season of the drainage, but also after the formation a cluster by algae that have strong adhesion force, and then the microbial species contained in the effluent build secondary attachment and forms colony.Conclusions : In order to prevent the growth of adherent algae, a method of suppression of the growth of adherent algae by inhibition of photosynthesis was studied by installing a cover device on the weir and drain channels. As a result of installing a cover (34,000 thousand won) and reviewing economic feasibility, it can be recovered in 2.6 years, and stainless steel was selected in the view of mechanical stability and facility aging. The final sedimentation water quality increased 99.8% of Ch-a concentration treatment efficiency and 15% of SS sedimentation efficiency by installing a cover.

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operation

2008 ◽  
Vol 37 (2) ◽  
Author(s):  
Maciej Walczak
Keyword(s):  
Water Quality ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sewage Treatment Plants ◽  
Plant Operation ◽  
Treated Sewage ◽  
Microbiological Parameters ◽  
Microbial Indices

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operationThis paper reports the results of studies of microbiological changes in the water quality of the Vistula and Brda rivers after the opening of sewage treatment plants in Bydgoszcz. The study involved determining the microbiological parameters of water quality. Based on the results obtained, it was found that the quality of the water in both rivers had improved decidedly after the opening of the plants, although an increased number of individual groups of microorganisms was found at the treated sewage outlet from one of the plants.

Assessment of Environmental Quality of Soil Fertilized Grapefruit Trees with Municipal Sewage Sludge

2013 ◽  
Vol 671-674 ◽  
pp. 2736-2741
Author(s):  
Yin An Ming ◽  
Tao Tao
Keyword(s):  
Sewage Sludge ◽  
Environmental Quality ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Land Application ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Limiting Factor

To reuse municipal sewage sludge safely, experiment was carried out on grapefruit trees fertilized with composted sludge from Shiweitou Sewage Treatment Plant in Xiamen City of China, and a method was introduced of how to assess the environmental quality of grapefruit trees soil fertilized with sludge by Set Pair Analysis (SPA) model. The results showed that the soil in the surface layer (0-15cm) and the deeper layer (15-30cm) was less clean, and the environment of soil was not polluted. Thus it was feasible to use sludge as fruit fertilizer. The maximum service life of sludge for continuous land application was estimated by taking Cd as the limiting factor, which would provide scientific guide and technical support for safe land application of sludge.

scholarly journals Performance of sewage treatment plant with septic tank, anaerobic filter and constructed wetland with Typha spp

2019 ◽  
Vol 14 (7) ◽  
pp. 1
Author(s):  
Paulo Fortes Neto ◽  
Nara Lucia Perondi Fortes ◽  
Elizabeth Da Costa Neves Fernandes de Almeida Duarte ◽  
Rita Do Amaral Fragoso ◽  
Ana Catarina Marcos Henriques ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetland ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Climatic Conditions ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Anaerobic Filter ◽  
Before And After

  The study reports the performance of a sanitary effluent treatment constituted by a septic tank, anaerobic filter and constructed wetland. The study monitored nutrient’s, carbonaceous material’s and thermotolerant coliform’s (CT) removal efficiency during 12 months. The treatment system included a septic tank, an anaerobic filter and a horizontal subsurface flow constructed wetland cultivated with Typha spp. Effluent samples were monthly collected before and after the septic tank, anaerobic filter and wetland. The removal efficiency for N-NH+4 was 37.6%, 66.3% for total P, 37% for COD, 54% for BOD and 99.4% for CT. The anaerobic filter and wetland were more efficient than the septic tank. P-total reduction was higher in the constructed wetland than in the anaerobic filter. Climatic conditions influenced the evaluated constituent’s removal being the highest values during hot months.

Alkylphenol Polyethoxylate Metabolites in Canadian Sewage Treatment Plant Waste Streams

1998 ◽  
Vol 33 (2) ◽  
pp. 231-252 ◽  
Author(s):  
D.T. Bennie ◽  
C.A. Sullivan ◽  
H.-B. Lee ◽  
R.J. Maguire
Keyword(s):  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Dry Weight ◽  
Priority Substances ◽  
Waste Streams ◽  
Nonylphenol Ethoxylate ◽  
Almost All ◽  
Final Effluent

Abstract Nonylphenol polyethoxylates and their refractory metabolites, including nonylphenol, are on the second Priority Substances List (PSL2) to determine if they are "toxic" as defined under the Canadian Environmental Protection Act. This study addresses the need for data on their occurrence in raw sewage, final effluents and sludge in Canada. Samples of raw sewage, final effluent and sludge were collected from 16 wastewater treatment plants across Canada in 1995 and 1996. These samples were analyzed for 4-nonylphenol (4-NP), nonylphenol ethoxylate (NP1EO), nonylphenol diethoxylate (NP2EO) and 4-4-tert-octylphenol (4-t-OP). Measurable quantities of these chemicals were found in almost all raw sewage and sludge samples. In the raw sewage, concentrations ranged from <0.005 to 21 μg/L for 4-t-OP, from 0.69 to 155 μg/L for 4-NP, from 2.9 to 43 μg/L for NP1EO and from 0.26 to 24 μg/L for NP2EO. Sludge concentrations (based on dry weight) ranged from <0.010 to 20 μg/g, from 8.4 to 850 μg/g, from 3.9 to 437 μg/g and from 1.5 to 297 μg/g for 4-t-OP, 4-NP, NP1EO and NP2EO, respectively. Of the final effluent samples, 60% contained detectable amounts of 4-t-OP and concentrations ranged from <0.005 to 0.37 μg/L. Almost all of the final effluent samples had detectable levels of 4-NP, NP1EO and NP2EO. The 4-NP concentrations varied from <0.020 to 13 μg/L, NP1EO was found in the range of 0.072 to 26 μg/L and NP2EO was found in the range of 0.099 to 21 μg/L.

scholarly journals MBBR+two-stage AO in upgrading and rebuilding project Of a sewage treatment plant in north China

2019 ◽  
Vol 136 ◽  
pp. 06031
Author(s):  
Shen Dongmei ◽  
Yu Cairui ◽  
Gao Yulan ◽  
Song Xinwei ◽  
Chu Jingsong
Keyword(s):  
High Efficiency ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxidation Ditch ◽  
Effluent Quality ◽  
Second Stage ◽  
The North ◽  
Filter Process

A sewage treatment plant is located in the middle of Inner Mongolia. There is a large amount of slaughtering wastewater in the influent with high COD, SS, low annual temperature, poor nitrogen removal effect, and the effluent quality is only grade B. In order to solve the above problems, A\A\O-MBBR + high efficiency sedimentation tank continuous sand filter process was adopted to establish a new anaerobic tank and a first stage AO-MBBR bioreactor. The selection tank and partial oxidation ditch were transformed into the second stage A pool (anoxic pool), and the remaining part of the existing oxidation ditch was transformed into the second stage O pond (aerobic pool), which further removed phosphorus and reduced the SS in the sewage, and solved the problem of low temperature biological treatment in winter in the north of China. The quality of the effluent reached level A after the upgrading.

scholarly journals Differences in the ASM model caused by data structure

2018 ◽  
Vol 45 ◽  
pp. 00036
Author(s):  
Zbigniew Kowalewski
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Municipal Sewage ◽  
Insufficient Amount ◽  
The Usa ◽  
Plant Monitoring ◽  
Model Family

The process of designing and exploiting municipal sewage treatment plants has become much simpler and more efficient thanks to mathematical modeling. The ASM model family is able to simulate the operation of existing or designed objects in a satisfactory manner. The basic problem in Poland is the insufficient amount of data for simulations coming from plant monitoring. It is provided to create unstable model results with difficulties in calibration and validation. The aim of this article is to confirm how the amount of data and its completeness will affect the quality of the simulation performed in the ASM model. The study object is a sewage treatment plant located in Chicago in the USA. It is a sewage treatment plant operating with activated sludge technology, with regular monitoring of the quality of raw and treated wastewater. For modeling, a variant of the ASM model built into the BioWin 5.2 software was used.

scholarly journals Causes of polytrophism of three lakes in the Wdzydze Landscape Park

2011 ◽  
Vol 11 (3) ◽  
pp. 97-103
Author(s):  
Jerzy Jańczak ◽  
Wojciech Maślanka ◽  
Kamil Nowiński
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Compounds ◽  
Lake Water Quality ◽  
Nitrogen And Phosphorus ◽  
Quality Of Water ◽  
Quality Of Waters ◽  
Lake Inflows

Causes of polytrophism of three lakes in the Wdzydze Landscape ParkIn the lakes Cheb and Słupino, located in the Wdzydze Landscape Park the quality of waters has been deteriorating in recent years. In the hydrologic year 2009 the quality of water was examined three times. Monthly measurements on the lake inflows and outflows were carried out 12 times to determine biogenic loads. In 2010 the supplementary measurements of biogenic loads were taken in the streams five times. According to Vollenweider's criterion, the loads of nitrogen and phosphorus compounds are too big, the heaviest to Lake Cheb. The discharge from the new sewage treatment plant is directed by the inflows into this lake. A similar situation takes place in the inflow to Lake Schodno. Paradoxically, in some catchments the construction of the sewage treatment plant may result in the deterioration of lake water quality.

scholarly journals Effects of precipitation on the amount and quality of raw sewage entering a sewage treatment plant in Wodzisław Śląski

2017 ◽  
Vol 34 (1) ◽  
pp. 85-93 ◽  
Author(s):  
Krzysztof Chmielowski ◽  
Piotr M. Bugajski ◽  
Grzegorz Kaczor
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Precipitation Intensity ◽  
Descriptive Statistics ◽  
Mean Values ◽  
Sewage Contamination ◽  
Basic Parameters ◽  
Research Period

Abstract The study presents the effects of precipitation on the amount and quality of raw sewage entering a sewage treatment plant in Wodzisław Śląski. It covers a six-year period between January 2010 and December 2015. The research period was divided into seven classes of precipitation intensity. The classes were characterized for their basic descriptive statistics of the raw sewage entering the investigated sewage treatment plant (STP). Data obtained from the collected material and derived from an analysis indicated a considerable influence of precipitation on the amount of sewage entering the investigated facility. Mean amount of sewage entering the STP was by 10.5% (884.9 m3·d-1) greater in B class and by 69.6% (6,153.9 m3·d-1) greater in G class than during dry weather. Individual classes of precipitation intensity were compared for their mean values of raw sewage contamination. Precipitation intensity was found to significantly affect concentrations of the investigated parameters of raw sewage contamination. Basic parameters of sewage contamination (BOD5, CODCr, total suspended solids) were determined and their basic descriptive statistics, such as median, mean, minimum and maximum value, standard deviation and coefficient of variation were calculated.

scholarly journals Ciliated protozoa in the impact zone of the Uzhgorod treatment plant

2018 ◽  
Vol 30 ◽  
pp. 02008 ◽  
Author(s):  
Volodimir Pliashechnyk ◽  
Yaroslav Danko ◽  
Grzegorz Łagód ◽  
Jakub Drewnowski ◽  
Tatiana Kuzmina ◽  
...  
Keyword(s):  
Wide Spectrum ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Wastewater Discharge ◽  
Local Conditions ◽  
Ciliate Species ◽  
Before And After ◽  
Quantitative Development ◽  
The Impact

This paper presents the results of studies on the Uzh River (Ukraine, Zakarpattia Oblast) near the effluent point of a sewage treatment plant in Uzhgorod. The samples were taken at various sites of the treatment plant along the stages of purification process, as well as in the river, at a number of different points above and below the wastewater discharge. At each of these objects, the temperature and O2 were measured. The structure of ciliate assemblage was analyzed along the stages of the treatment process in the WWTP and in the river before and after the sewage discharge. A total of 26 ciliate taxa were observed and included in the analysis. All the studied stations were considered as a continuum in which populations of protozoa spread freely according to their ecological preferences. The majority of ciliate species were encountered in each of the examined stations, but their quantitative development differed significantly, reflecting their response to the environmental conditions at the stations. The analysis of the qualitative and quantitative distribution of ciliate populations by the stations enabled to group them in respect to the peculiarities of the local conditions. The study showed that the majority of the ciliate species, typical of bioreactors, are equally common at the stations of the Uzh River below wastewater discharges. The ciliate assemblage in the oxygen gradient demonstrated a wide spectrum of ecological tolerance at the species level. These findings confirm that ciliates are very good indicators of the environmental quality, provided that detailed information about their environmental priorities is available.

Sign in / Sign up

Export Citation Format

Share Document