Disinfection of sludge using lime stabilisation and pasteurisation in a small wastewater treatment plant

2004 ◽  
Vol 50 (1) ◽  
pp. 13-17 ◽  
Author(s):  
R. Keller ◽  
R.F. Passamani-Franca ◽  
S.T. Cassini ◽  
F.R. Goncalves
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Uasb Reactor ◽  
Faecal Coliforms ◽  
Lime Treatment ◽  
Physical Treatment ◽  
Helminth Eggs ◽  
In Series ◽  
Liquid And Solid Phases

Removal efficiency of faecal coliforms and helminth eggs was evaluated in a small wastewater treatment plant (WWTP) serving a population of 1,000. This system was formed by the association in series of a UASB reactor and four submerged aerated biofilters. The density of faecal coliforms and the count of helminth eggs were estimated in the liquid and solid phases of the system. Two different methods of disinfecting sludge were investigated: (a) chemical treatment with lime and (b) a physical treatment by pasteurisation. As expected, the association UASB + BF was very efficient at removal of helminth eggs from the final tertiary effluent, but coliforms were still present at high densities. Lime treatment and pasteurisation of sludge were very effective methods of disinfection and produced a sludge safe for final disposal.

scholarly journals Evaluation of a domestic wastewater treatment plant at an intermediate city in Cochabamba, Bolivia

2019 ◽  
Vol 14 (4) ◽  
pp. 908-920 ◽  
Author(s):  
Oliver Saavedra ◽  
Ramiro Escalera ◽  
Gustavo Heredia ◽  
Renato Montoya ◽  
Ivette Echeverría ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Agricultural Land ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Annual Rainfall ◽  
Medium Size ◽  
Anaerobic Sludge

Abstract This study aims to determine the seasonal variability in the performance of a medium size population wastewater treatment plant (WWTP) in Bolivia. The semi-arid area where the WWTP is located is characterized as agricultural land, with an annual rainfall of 500 mm and a mean temperature of 17 °C. The WWTP is built up of five modules, each one comprising two treatment trains composed of an upflow anaerobic sludge blanket (UASB) reactor and horizontal gravel filter. The performance of the full process has been determined based on water quantity and quality. Seven monitoring campaigns of chemical and physical wastewater characteristics were performed from March to December 2017. The measured effluent showed average removal efficiencies of 83 ± 8% and 37 ± 60% for total chemical oxygen demand (COD) and total suspended solids (TSS), respectively. The treatment system has proven to be efficient to remove organic matter and TSS, despite the occurrence of high COD and total solids (TS) influent concentrations, the accumulation of solids at all the processes and the variability of flow and temperature inside the UASB reactors. In order to improve further this efficiency, it is recommended to implement a primary sedimentation unit as a pretreatment for the UASB system that would help to homogenize both the flow and the quality of the influent.

scholarly journals Proposed Wastewater Treatment Plant for a Paper Mill

2012 ◽  
Vol 11 ◽  
pp. 25-28
Author(s):  
Arshad Ali ◽  
Muhammad Jawed Iqbal
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Environmental Problem ◽  
Treatment Plant ◽  
Paper Mill ◽  
Uasb Reactor ◽  
Plant Design ◽  
Pollution Load ◽  
Effi Ciency ◽  
Wastewater Samples

The decline in the availability and alarming pollution of the existing water resources is the major environmental problem of third-world countries. The main reason of water pollution is the disposal of untreated industrial effl uents. This study was designed to evaluate the pollution load caused by a paper mill, and to propose a wastewater treatment plant design, based on the analyses of wastewater samples. The wastewater samples were collected from the local paper mill for a period of more than four months on a regular basis. The pH, temperature, color, TSS, TDS, BOD, COD and AOX were measured as, 8.1, 23°C, 2,431 PtCo unit, 956 mg/L, 3,046 mg/L, 1,582 mg/L, 2,492 mg/L and 19.81 mg/L, respectively. Based on the data obtained, the wastewater treatment plant consisting of a screening chamber, primary sedimentation tank and a UASB reactor was designed. It was concluded that the treatment effi ciency of more than 75% removal of BOD and COD concentrations could be accomplished. The treatment plant will also be able to produce 2,200 m3/day of biogas.DOI: http://dx.doi.org/10.3126/hn.v11i0.7157 Hydro Nepal Vol.11 2011 pp.25-28

scholarly journals Comparison of Biodegradation of Fats and Oils by Activated Sludge on Experimental and Real Scales

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1286 ◽  
Author(s):  
Pedro Cisterna-Osorio ◽  
Patricia Arancibia-Avila
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Fats And Oils ◽  
Mass Loading ◽  
Physical Treatment ◽  
Treatment Unit ◽  
Wastewater Treatment Systems

Fats and oils are the most common pollutants in wastewater, and are usually eliminated through physical processes in wastewater treatment plants, generating large amounts of fats and residual oils that are difficult to dispose of and handle. The degradation of fatty wastewater was studied in a real wastewater treatment plant and a laboratory scale treatment unit. The wastewater treatment plant, located in Chile, was designed for a population of 200,000 inhabitants. It includes an aerobic digester that receives fat and oils retained in a degreaser and treats the fats and oils together with biomass. The biodegradation of fats and oils was analyzed in both wastewater treatment systems. Key parameters were monitored such as the concentration of fats and oils in the influents and effluents, mass loading, and the efficiency of biodegradation. The mass loading range was similar in both wastewater treatment systems. In the experimental activated sludge plant, the biodegradation of fats and oils reached levels in the range of 64% to 75%. For the wastewater treatment plant with an aerobic digester, the levels of biodegradation of fats and oils ranged from 69% to 92%. Therefore, considering the efficiency of the elimination of fats and oils, the results indicated that physical treatment should be replaced with biological treatment so that the CO2 generated by the biodegradation will be incorporated into the carbon cycle and the mass of fats and oils in landfills will be reduced.

Research on Pollutant Loading of Biological Aerated Filter

2013 ◽  
Vol 368-370 ◽  
pp. 265-268
Author(s):  
Jie Wang ◽  
Xiao Min Hu
Keyword(s):  
Wastewater Treatment ◽  
Key Words ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Biological Aerated Filter ◽  
Two Stage ◽  
Pollutant Loading ◽  
Hydraulic Loading ◽  
In Series ◽  
Aerated Filter

The aim of this study is to investigate the pollutant loading of two-stage biological aerated filter in series. We choose Shenyang Xiannhe wastewater treatment plant as research site. By testing pollutant loading under conditions of the same hydraulic loading and different hydraulic loading respectively, we discovered that there was great difference between the 1st filter and the 2nd filter. COD loading of the 1st filter varied from 2.0 m-3.d-1 to 6.0 m-3.d-1,however NH4-H loading was more complex with NH4-H remove rate being negative in most cases . COD loading of 2nd filter was from 0.2 m-3.d-1to 1.5 m-3.d-1,and NH4-H loading was from 0.4 m-3.d-1 to 1.5 m-3.d-1. Key words: biological aerated filter;pollutant loading.

Poultry slaughterhouse wastewater treatment plant for high quality effluent

2015 ◽  
Vol 73 (2) ◽  
pp. 309-316 ◽  
Author(s):  
V. Del Nery ◽  
M. H. Z. Damianovic ◽  
R. B. Moura ◽  
E. Pozzi ◽  
E. C. Pires ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Phosphorus Concentration ◽  
Removal Efficiencies ◽  
Nitrification And Denitrification

This paper assesses a wastewater treatment plant (WWTP) regarding the technology used, as well as organic matter and nutrient removal efficiencies aiming to optimize the treatment processes involved and wastewater reclamation. The WWTP consists of a dissolved air flotation (DAF) system, an upflow anaerobic sludge blanket (UASB) reactor, an aerated-facultative pond (AFP) and a chemical-DAF system. The removal efficiencies of chemical oxygen demand (COD) (97.9 ± 1.0%), biochemical oxygen demand (BOD) (98.6 ± 1.0%) and oil and grease (O&G) (91.1 ± 5.2%) at the WWTP, the nitrogen concentration of 17 ± 11 mgN-NH3 and phosphorus concentration of 1.34 ± 0.93 mgPO4−3/L in the final effluent indicate that the processes used are suitable to comply with discharge standards in water bodies. Nitrification and denitrification tests conducted using biomass collected at three AFP points indicated that nitrification and denitrification could take place in the pond.

scholarly journals Grey water footprint of a dairy industry wastewater treatment plant: a comparative study

2018 ◽  
Vol 14 (1) ◽  
pp. 137-144
Author(s):  
Pelin Soyertaş Yapıcıoğlu
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Water Footprint ◽  
Dairy Industry ◽  
Treatment Plant ◽  
Organic Content ◽  
Uasb Reactor ◽  
Oil And Grease ◽  
Grey Water ◽  
Industry Wastewater

Abstract Available fresh water demand of a growing population is a fundamental concern of water resource sustainability. Dairy industry wastewater treatment plants have been considered a major polluter due to the high organic content and large wastewater discharges. Grey water footprint (GWF) was developed by the Water Footprint Network (WFN) as a measure of the water pollution loading. In this study, four treatment scenarios including no treatment process (Scenario-1), primary treatment using Dissolved Air Flotation (DAF) (Scenario-2), secondary treatment using DAF and a Upflow Sludge Bed (UASB) reactor (Scenario-3), and a DAF and UASB with a reuse application applying reverse osmosis (RO) (Scenario-4) have been studied for a full-scale dairy industry wastewater treatment plant. For these four scenarios, GWF assessment was undertaken using the WFN method by taking into consideration three pollutant parameters, chemical oxygen demand (COD), fats, oil and grease (FOG) and total suspended solids (TSS). The results show that the GWF of Scenario-4 for COD was lowest with the value of −5,609 m3/d and Scenario-1 has the highest GWF for TSS with the value of 41,026 m3/d. According to the assessment results, reuse applications decrease the GWF values.

scholarly journals Evaluation of an ASM1 model calibration procedure on a municipal–industrial wastewater treatment plant

2002 ◽  
Vol 4 (1) ◽  
pp. 15-38 ◽  
Author(s):  
Britta Petersen ◽  
Peter A. Vanrolleghem ◽  
Krist Gernaey ◽  
Mogens Henze
Keyword(s):  
Sensitivity Analysis ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Model Calibration ◽  
Industrial Wastewater ◽  
Treatment Plant ◽  
Calibration Procedure ◽  
Model Output ◽  
In Series ◽  
Series Configuration

The purpose of the calibrated model determines how to approach a model calibration, e.g. which information is needed and to which level of detail the model should be calibrated. A systematic model calibration procedure was therefore defined and evaluated for a municipal–industrial wastewater treatment plant. In the case that was studied it was important to have a detailed description of the process dynamics, since the model was to be used as the basis for optimisation scenarios in a later phase. Therefore, a complete model calibration procedure was applied including: (1) a description of the hydraulics in the system via a tracer test, (2) an intensive measuring campaign and (3) supporting lab-scale experiments to obtain and confirm kinetic parameters for the model. In this paper the model calibration procedure for this case study is described step by step, and the importance of the different steps is discussed. The calibrated model was evaluated via a sensitivity analysis on the influence of model parameters and influent component concentrations on the model output. The sensitivity analysis confirmed that the model output was sensitive to the parameters that were modified from the default parameter values. The calibrated model was finally reduced from a 24 tanks-in-series configuration to a 12 tanks-in-series configuration, resulting in a 50% reduction of the simulation time.

scholarly journals Pesticide removal through wastewater and advanced treatment: full-scale sampling and bench-scale testing

2017 ◽  
Vol 77 (3) ◽  
pp. 739-747 ◽  
Author(s):  
J. D. Kenny ◽  
B. D. Webber ◽  
E. W. Howe ◽  
R. B. Holden
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Full Scale ◽  
Secondary Effluent ◽  
Physical Treatment ◽  
Bench Scale ◽  
Pesticide Removal ◽  
Treatment Processes

Abstract Dieldrin and DDx removal through wastewater treatment, ozonation, and microfiltration was assessed for a water reuse project for groundwater replenishment in Monterey, California, USA. Full-scale sampling was conducted at the wastewater treatment plant, and physical wastewater treatment processes, ozonation, and microfiltration were tested at the bench scale. Removals observed through wastewater treatment, ozonation, and microfiltration were 84%, 44% to 63%, and 97% to 98%, respectively, for dieldrin, and 93%, 36% to 48%, and 92% to 94% for DDx. These were sufficient to meet California Ocean Plan water quality objectives after wastewater treatment alone. Levels in the secondary effluent, ahead of ozonation, microfiltration, reverse osmosis and advanced oxidation in the advanced water purification facility, met drinking water standards. Removal of dieldrin and DDx through wastewater treatment occurred by physical treatment processes; removal through the full-scale wastewater treatment plant, which included biological and physical treatment processes, matched removal through the physical bench-scale wastewater treatment processes. Dieldrin and DDx removal correlated with removal of volatile suspended solids, suggesting that volatile suspended solids could be used as an indicator for pesticide removal through wastewater treatment. Dieldrin and DDx concentrations were highest in the solids contact process, where biomass is accumulated for carbon removal.

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