scholarly journals Performance of UASB Post Treatment Technologies for Sewage Treatment in Surat City

2019 ◽  
Vol 35 (4) ◽  
pp. 1352-1359
Author(s):  
Nimeshchandra Vasanji Vashi ◽  
Navinchandra Champaklal Shah ◽  
Kishor Ratilal Desai
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Full Scale ◽  
Post Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Treatment Processes ◽  
Treated Sewage

Upflow Anaerobic Sludge Blanket (UASB) process is a popular process for treatment of sewage in India due to its low power requirement. However, UASB system has many limitations in terms of removal of carbon, nutrients and pathogens. This requires post treatment after UASB to meet the treated water quality standards. Current treatment processes adopted for the post-treatment of anaerobically treated sewage, especially the full-scale UASB reactors in Surat, India are presented. Two full scale treatment plants with different UASB post treatment processes viz., Extended Aeration and Moving Bed Biological Reactor (MBBR) are selected for studies. A pilot study was carried out in a full scale Sewage Treatment Plant (STP) to study the performance of Sequential Batch Reactor (SBR) for treatment of UASB treated sewage and the results are reported for period of Three months. Inlet and outlet parameters such as Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), etc. for post UASB biological process are presented. The performance of the SBR process was observed to be better among all the processes studied.

scholarly journals Performance evaluation of a large sewage treatment plant in Brazil, consisting of an upflow anaerobic sludge blanket reactor followed by activated sludge

2017 ◽  
Vol 76 (8) ◽  
pp. 2003-2014 ◽  
Author(s):  
Pollyane Diniz Saliba ◽  
Marcos von Sperling
Keyword(s):  
Activated Sludge ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Sewage ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Removal Efficiencies ◽  
Anaerobic Sludge Blanket

The objective of this study was to evaluate the behaviour of a system comprising an upflow anaerobic sludge blanket reactor followed by activated sludge to treat domestic sewage. The Betim Central sewage treatment plant, Brazil, was designed to treat a mean influent flow of 514 L/s. The study consisted of statistical treatment of monitoring data from the treatment plant covering a period of 4 years. This work presents the concentrations and removal efficiencies of the main constituents in each stage of the treatment process, and a mass balance of chemical oxygen demand (COD) and nitrogen. The results highlight the good overall performance of the system, with high mean removal efficiencies: BOD (biochemical oxygen demand) (94%), COD (91%), ammonia (72%) and total suspended solids (92%). As expected, this system was not effective for the removal of nutrients, since it was not designed for this purpose. The removal of Escherichia coli (99.83%) was higher than expected. There was no apparent influence of operational and design parameters on the effluent quality in terms of organic matter removal, with the exceptions of the BOD load upstream of the aeration tank and the sludge age in the unit. Results suggest that this system is well suited for the treatment of domestic sewage.

Impact of microaeration bioreactor on dissolved sulfide and methane removal from real UASB effluent for sewage treatment

2020 ◽  
Vol 81 (9) ◽  
pp. 1951-1960 ◽  
Author(s):  
C. S. Cabral ◽  
A. L. Sanson ◽  
R. J. C. F. Afonso ◽  
C. A. L. Chernicharo ◽  
J. C. Araújo
Keyword(s):  
Sewage Treatment ◽  
Oxygen Demand ◽  
Post Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Sulfide Removal ◽  
Dissolved Sulfide ◽  
Removal Efficiencies ◽  
Anaerobic Sludge Blanket

Abstract Two bioreactors were investigated as an alternative for the post-treatment of effluent from an upflow anaerobic sludge blanket (UASB) reactor treating domestic sewage, aiming at dissolved sulfide and methane removal. The bioreactors (R-control and R-air) were operated at different hydraulic retention times (HRT; 6 and 3 h) with or without aeration. Large sulfide and methane removal efficiencies were achieved by the microaerated reactor at HRT of 6 h. At this HRT, sulfide removal efficiencies were equal to 61% and 79%, and methane removal efficiencies were 31% and 55% for R-control and R-air, respectively. At an HRT of 3 h, sulfide removal efficiencies were 22% (R-control) and 33% (R-air) and methane removal did not occur. The complete oxidation of sulfide, with sulfate formation, prevailed in both phases and bioreactors. However, elemental sulfur formation was more predominant at an HRT of 6 h than at an HRT of 3 h. Taken together, the results show that post-treatment improved the anaerobic effluent quality in terms of chemical oxygen demand and solids removal. However, ammoniacal nitrogen was not removed due to either the low concentration of air provided or the absence of microorganisms involved in the nitrogen cycle.

Performance of UASB based sewage treatment plant in India: polishing by diffusers an alternative

2011 ◽  
Vol 63 (4) ◽  
pp. 680-688 ◽  
Author(s):  
R. Walia ◽  
P. Kumar ◽  
I. Mehrotra
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Total Coliform ◽  
Point Of View ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Detention Ponds ◽  
One Year

In India, recently, upflow anaerobic sludge blanket (UASB) based sewage treatment plants (STPs) have come up in a big way. Sequence adopted: screens- grit chambers- UASB reactors followed by one-day detention ponds (DP). Performance of DPs located at five STPs (27–70 ML/d) was evaluated over a period of one year from July 2004 to July 2005. The installation of these non-algal ponds reduced land requirement, but from treatment point of view it at best offered only removal of solids washed out of the UASB reactor. Total coliform count in the effluent from ponds ranging from 106 to 109 MPN/100 mL is more than the maximum permissible limit of 10,000 MPN/100 mL. A need has, therefore, been felt to evaluate the possibility of aerating the effluent from UASBR. During aeration, ORP and DO increase, whereas COD and BOD decrease. In a continuous aeration ~50% reduction in COD and nearly 50% increase in DO saturation (DO/DOs) can be achieved by increasing ORP from −100 to 122 mV. Regression equation established between ORP and COD/CODi & DO/DOs may find wide application.

scholarly journals Prediction of Five-day Biochemical Oxygen Demand (BOD5) from Chemical Oxygen Demand (COD) Values in Raw and Biologically Treated Domestic Sewage

2015 ◽  
Vol 58 (3) ◽  
pp. 172-174
Author(s):  
Ita Erebho Uwidia ◽  
Christopher Ejeomo
Keyword(s):  
Regression Analysis ◽  
Functional Relationship ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Sewage ◽  
Sewage Effluent ◽  
Confidence Levels ◽  
Treated Sewage

The functional relationship between BOD5 and COD was evaluated using domestic sewage samples collected from a sewage treatment plant in an estate in Warri, Delta State, Nigeria. Two types of samples were collected: raw domestic sewage,(influent) and biologically treated domestic sewage (effluent).The correlation coefficient ‘r’ between the BOD5 and COD was determined and values were 0.99 and 0.94, respectively for different sewage samples. The regression analysis carried out showed very strong correlation . The linear correlation established was: COD = 1.62 BOD5 + 15.82 ; r2 = 0.978; COD = 1.58BOD5 + 9.21; r2 = 0.878. Results obtained above were also judged as significant at 95% and 99% confidence levels. Confidence intervals obtained were: 1.53£ a £1.71 at 95% and 1.49£ a £1.75 at 99% for the raw sewage; 1.37£ a £ 1.80 at 95% and 1.27£ a £1.90 at 99% for the biologically treated sewage. 

Application of biochemical products as a bioremediation technique for domestic sewage treatment plants

2007 ◽  
Vol 56 (7) ◽  
pp. 33-40 ◽  
Author(s):  
Salmiati ◽  
M.R. Salim ◽  
R.Md. Hassan ◽  
K.Y. Tan
Keyword(s):  
Suspended Solids ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Quality Parameters ◽  
Sewage Treatment Plants ◽  
Treatment Performance ◽  
Treatment Processes ◽  
Overall Performance

Biochemical products have been widely used for treatment of various types of wastewater. The treatment processes with the addition of biochemical products are quite attractive because of their simplicity, minimal use of equipment, they are environmentally friendly and are suitable for the removal of organic pollutants. The purpose of these products is to enhance the activities of beneficial microbes in order to improve treatment performance. This study was carried out to determine the potential of applying biochemical products in assisting and improving the performance of sewage treatment plants. In this study, four biochemical products, namely: Zeolite, Bio-C, Eco-B and Was-D, were applied to the sewage treatment plant. Analyses were carried out on several water quality parameters such as biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SS), oil & grease (O&G), phosphorus (P), ammoniacal nitrogen (AN) and sludge thickness (ST). From the results obtained, it can be seen that the overall performance of the treatment plant improved with most of the parameters studied were found to fulfill the DOE Standard B requirements. The performance of Bio-C was found to give better results than other products.

scholarly journals Scum yield and effectiveness of a hydrostatic removal device: case study of Laboreaux STP

2017 ◽  
Vol 12 (1) ◽  
pp. 202-210 ◽  
Author(s):  
A. P. Rosa ◽  
A. V. Santos ◽  
A. D. U. C. Schmidt ◽  
J. M. Borges ◽  
C. A. L. Chernicharo
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Operating Conditions ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Yield Coefficient ◽  
Anaerobic Sludge Blanket

This paper aimed to evaluate the effectiveness of a device to remove scum from the inner part of gas-liquid-solid separators of a full-scale upflow anaerobic sludge blanket reactor treating domestic sewage, as well as determining the scum yield coefficient for different reactors’ operating conditions. The experiments were carried out at the Laboreaux sewage treatment plant (Itabira, Minas Gerais, Brazil) and the effectiveness of the scum removal device was fully demonstrated, with median efficiencies ranging from 65 to 90%. The average scum yield varied from 6.8 to 14.6 mL of scum formed per kg COD applied.

scholarly journals Modelling and Life Cycle Assessment of Sewage Treatment Plant (STP) in Lucknow City

2021 ◽  
Vol 9 (VII) ◽  
pp. 3793-3803
Author(s):  
Narendra Pal Gole
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Water Concentration ◽  
Domestic Wastewater ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge

The implementation of wastewater treatment plants has been a challenge for most countries. Economic resources, political will, institutional strength, and cultural background are important factors that define the trajectory of pollution control in many countries. Technology is sometimes mentioned as one of the reasons hindering further development. Therefore, a key objective of this research is to evaluate the performance of a plant based on the 345 MLD Upflow Anaerobic Sludge Blanket (UASB) technology by analyzing the physical and chemical parameters of the water treated by UASB to evaluate the performance of the plant located. at Bharwara Tech from Gomti Nagar Lucknow. In this study, the performance of the wastewater treatment plant and the UASB reactor was calculated. Wastewater is mixed with domestic wastewater, so the concentration of BOD and COD is relatively low. The amount of biogas produced by the UASB reactor is also less than its design value. All STP inlet and outlet water concentration results are displayed graphically.

scholarly journals Evaluating the resilience of a full-scale down-flow hanging sponge reactor to shock-loadings

2021 ◽  
Author(s):  
Takashi Onodera ◽  
Tsutomu Okubo ◽  
Daisuke Takayama ◽  
Kazuaki Syutsubo ◽  
Takashi Yamaguchi ◽  
...  
Keyword(s):  
Shock Loading ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Municipal Sewage ◽  
Anaerobic Sludge ◽  
Stable Operation ◽  
Scale Down ◽  
Anaerobic Sludge Blanket

Abstract The effect of shock-loading on the performance of a full-scale down-flow hanging sponge (DHS), used to treat effluent from an up-flow anaerobic sludge blanket treating municipal sewage, was evaluated. This full-scale DHS reactor comprises a polyurethane sponge that retains the sludge. It has a capacity of 500 m3/day and, at the time of this study, had been operating at a sewage treatment plant in India for more than 1,300 days. The DHS reactor was exposed to shock-loadings of organics at double the normal rate for 400 min under summer and winter conditions. The results showed that the DHS reactor maintained stable operation under the organic shock-loading and that it returned to a steady state soon after restart, confirming that the reactor was resilient to organic shock-loadings.

Treatment of sulfide-rich UASB effluent: comparison of poly-aluminium chloride and iron-salts

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
N. N. Rao ◽  
Tapas Nandy
Keyword(s):  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Aluminium Chloride ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Sulfide Removal ◽  
Treated Effluent ◽  
High Concentrations

Coagulation treatment of sulfide-rich effluent from an upflow anaerobic sludge blanket (UASB) reactor in a full-scale Sewage Treatment Plant (STP) is reported. The STP treats combined wastewater from tanneries and sewage, however, the treatment in the existing UASB reactor was not optimal. This resulted in high concentrations of chemical oxygen demand (COD), 530–590 mg/L; biochemical oxygen demand (BOD), 180–210 mg/L; and sulfide, 142–161 mg/L in the treated effluent. The high concentrations of sulfide in the UASB effluent resulted in higher oxygen demand. Therefore, further treatment of UASB effluent was necessary to comply with the discharge standards. In the present study, polyaluminium chloride (PACl, liquid & solid-type), ferric alum and Fe-salts (ferrous sulfate and ferric chloride) were used as coagulants and their effectiveness was compared. Optimization of doses of the chosen coagulants/salts, were carried out with the objective of achieving discharge standards with respect to COD, BOD and sulfide. Application of optimized dose of Ecorite PACl-2018 (0.378 mmol/L Al) and PACl (other brand, OB, 0.684 mmol/L Al) resulted in 68.0–80.0% TSS (total suspended solids), 13.0–18.0% COD, 26.0–35.0% BOD and 58.5–59.2% sulfide removal. On the other hand, use of Fe-salts lead to enhanced removal of pollutants; 80.0–83.0% TSS, 57.0–60.7% COD, 88.0–89.0% BOD and 99.0–99.4% sulfide. The Fe-salts were found to be more effective for sulfide removal as FeS. Such efficient removal of sulfide leads to decrease in COD and BOD concentrations and ensures compliance of final treated effluent from STP with the discharge standards.

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