Ozone-based reclamation of an STP effluent

2011 ◽  
Vol 63 (10) ◽  
pp. 2123-2130 ◽  
Author(s):  
A. Rodríguez ◽  
R. Rosal ◽  
M. J. Gomez ◽  
E. García-Calvo ◽  
A. R. Fernandez-Alba
Keyword(s):  
Hydrogen Peroxide ◽  
Reference Data ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Gas Mixture ◽  
Order Kinetic ◽  
Secondary Clarifier ◽  
Order Kinetic Model ◽  
Wastewater Samples

The system ozone and hydrogen peroxide was used to reclaim wastewater from the secondary clarifier from a Sewage Treatment Plant (STP) of Alcalá de Henares (Madrid-Spain). The assays were performed by bubbling a gas mixture of oxygen and ozone, with ∼24 g Nm−3 of ozone concentration, through a volume of wastewater samples for 20 minutes at 25°C . The removal of dissolved micropollutants such as Pharmaceutical and Personal Care Products (PPCPs) and Organic Carbon (TOC) was enhanced by adding periodic pulses of hydrogen peroxide while keeping pH above 8.0 throughout the runs. Removal efficiency ratios in the range of 7–26 mg O3/mg TOC and 0.24 mg O3 /ng micropollutants at 5 minutes of ozonation were assessed as reference data to reclaim wastewater from STP. The relation between the extent of TOC removed and ozone doses used was related by a second-order kinetic model in which the time-integrated ozone-hydrogen peroxide concentration was included.

Photo-degradation of clofibric acid by ultraviolet light irradiation at 185 nm

2009 ◽  
Vol 60 (11) ◽  
pp. 2983-2989 ◽  
Author(s):  
Wenzhen Li ◽  
Shuguang Lu ◽  
Nuo Chen ◽  
Xiaogang Gu ◽  
Zhaofu Qiu ◽  
...  
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Chloride Ion ◽  
Clofibric Acid ◽  
Order Kinetic ◽  
Negative Effects ◽  
Ion Release ◽  
Solution Ph ◽  
Order Kinetic Model

As a metabolite of lipid regulators, clofibric acid (CA) was investigated in this study for its ultraviolet (UV) degradation at monochromatic wavelength of 185 nm using Milli-Q water and sewage treatment plant (STP) effluent. The effects of CA initial concentration, solution pH, humic acid (HA), nitrate and bicarbonate anions on CA degradation performances were evaluated. All CA degradation patterns well fitted the pseudo-first-order kinetic model. The results showed that ∙OH generated from water photolysis by UV185 irradiation was involved, resulting in indirect CA photolysis but contributed less to the whole CA removal when compared to the main direct photolysis process. Acid condition favored slightly to CA degradation and other constituents in solution, such as HA (5.0–100.0 mg L−1), nitrate and bicarbonate anions (1.0 × 10−3 mol L−1 and 0.1 mol L−1), had negative effects on CA degradation. When using real STP effluent CA degradation could reach 97.4% (without filtration) and 99.3% (with filtration) after 1 hr irradiation, showing its potential mean in pharmaceuticals removal in UV disinfection unit. Mineralization tests showed that rapid chloride ion release happened, resulting in no chlorinated intermediates accumulation, and those non-chlorinated intermediate products could further be nearly completely degraded to CO2 and H2O after 6 hrs.

Occurrence and Elimination of Nonylphenol Ethoxylates and Metabolites in Municipal Wastewater and Effluents

1998 ◽  
Vol 33 (3) ◽  
pp. 389-402-402 ◽  
Author(s):  
Hing-Biu Lee ◽  
Thomas E. Peart
Keyword(s):  
Carboxylic Acids ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Elimination Rate ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Nonylphenol Ethoxylates ◽  
Wastewater Samples ◽  
One Year ◽  
Final Effluent

Abstract A survey of the concentrations of nonylphenol ethoxylates (NPnEO) and their metabolites in wastewater samples collected from a Canadian sewage treatment plant using primary and secondary treatment is presented. Twenty-four-hour composite raw sewage, primary effluent and final effluent samples were collected monthly over a one-year period. Levels of NPnEO (n = 1 to 17) and their metabolites, nonylphenol (NP) and nonylphenoxy carboxylic acids (NPnEC), in these samples were determined by HPLC and GC/MS methods. While ca. 85% of the total alkylphenolics in raw sewage are ethoxylates, the major component (nearly 80%) in the final effluent was in the form of carboxylic acids. During this study period, the median total alkylphenolic concentrations in raw sewage and final effluent were 526 and 248 nmol/L, respectively, representing an overall elimination rate of 53%. The estimated daily discharge of the nonylpheno-lics to the aquatic environment varied from 15 to 44 moles, with a median value of 20 moles. These data suggested that conventional sewage treatments are ineffective in the removal of the surfactant-derived metabolites.

Biosorption characteristics of reactive dye onto dried activated sludge

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
Dong-Jin Ju ◽  
Im-Gyu Byun ◽  
Chang-Han Lee ◽  
Gab-Hwan An ◽  
Tae-Joo Park
Keyword(s):  
Activated Sludge ◽  
Langmuir Isotherm ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Reactive Dye ◽  
Municipal Sewage ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Initial Ph

This study examined the removal of reactive dye onto dead cells in activated sludge collected from the municipal sewage treatment plant in Suyoung, Pusan. The biosorption of reactive dye from aqueous solutions using the activated sludge was studied using a batch system with respect to the initial pH, temperature, amount of adsorbent and the pre-treatment of the adsorbent. Both the Freundlich and Langmuir isotherm models could describe the adsorption equilibrium of the reactive dye onto the activated sludge with the Langmuir isotherm showing the best agreement. First- and second-order kinetic models were used to investigate the adsorption mechanism. The adsorption capacity of Rhodamine-B(Rh-B) onto the activated sludge increased with decreasing initial pH and temperature.

Oxidation of dissolved organic matter in the effluent of a sewage treatment plant using ozone combined with hydrogen peroxide (O3/H2O2)

2009 ◽  
Vol 149 (1-3) ◽  
pp. 311-318 ◽  
Author(s):  
Roberto Rosal ◽  
Antonio Rodríguez ◽  
José Antonio Perdigón-Melón ◽  
Alice Petre ◽  
Eloy García-Calvo
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant

Numerical simulation of a secondary clarifier in a sewage treatment plant using modified Bingham model

2011 ◽  
Vol 38 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Mohammad Reza Saffarian ◽  
Mohammad Hossein Hamedi ◽  
Mehrzad Shams
Keyword(s):  
Activated Sludge ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Computational Domain ◽  
Bingham Model ◽  
Consolidation Process ◽  
Solids Concentration ◽  
Secondary Clarifier ◽  
Sediment Flow

A numerical scheme for simulation of activated sludge sediment flow in a circular secondary clarifier is developed. The flow and settling processes are simulated, using the k–ε turbulence model on a two-dimensional axisymmetric and orthogonal grid. To incorporate the sedimentation of the activated sludge in the field of gravity, a convection–dispersion equation governing the mass transfer in the clarifier is extended. The computational domain includes the sludge blanket where the viscosity is affected by the rheological behavior of the sludge. The double-exponential equation is used to describe the dependence of the settling velocity on the solids concentration. The compression and consolidation process of the activated sludge is simulated by this equation. The experimental data provided by Weiss et al. show that the rheograms follow the Bingham law at low-shear rates. The modified Bingham model was introduced to overcome the blanket height overestimation problem with the results showing that the local sludge distribution in the clarifier has an excellent agreement with the concentration profile measurements by Weiss et al. (2007) and the sludge viscosity dominates the flow and sedimentation of activated sludge within the sludge blanket.

Analysis and Design of Sewage Treatment Plant: A Case Study Atnagore

2019 ◽  
Vol 1 (6) ◽  
pp. 543-552
Author(s):  
Elangovan G ◽  
Rajanandhini V.M
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sewage Water ◽  
Municipal Sewage ◽  
Steady Increase ◽  
Analysis And Design ◽  
Treated Sewage ◽  
Secondary Clarifier

The main objective of this study is to carry out to design of a sewage treatment plant for a Nagore and Nagore district, because it has been one of the developing pilgrimage places. Due to steady increase of increasing population, there will be more generation of domestic and municipal sewage. Sewage produces obnoxious smell which causes disease to all creatures. To avoid this problem, proper treatments is necessary before disposal to land by not throwing sewage directly to natural resources and reuse the treated water that ultimately reduces the overall demand of fresh water. Its objective is to produce an environmental safe fluid waste and solid waste suitable for disposal or reuse. In one day the total sewage generated was estimated 5 MLD considering the projected population of Nagore town for the next 30 years? Consequently this paper focuses on the sewage generation in the Nagore area based on the population and sewage treatment plant is designed accordingly. It is proposed to design the various components of sewage treatment plant considering the various standards and permissible limits of treated sewage water. The various components of sewage treatment plant are screening, grit chamber, primary sedimentation tank, biological reactor, secondary clarifier, activated sludge tank and drying beds.

scholarly journals Influence of the amount of inflowing wastewater on concentrations of pollutions contained in the wastewater in the Nowy Targ sewerage system

2019 ◽  
Vol 86 ◽  
pp. 00024 ◽  
Author(s):  
Elwira Nowobilska-Majewska ◽  
Piotr Bugajski
Keyword(s):  
Distribution System ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sewer System ◽  
Sewerage System ◽  
Combined Sewer ◽  
Wastewater Samples ◽  
Sewerage Network ◽  
Raw Wastewater

This study presents the results of the analysis concerning the influence of the amount of inflowing wastewater on concentrations of organic and biogenic pollutants, as well as chromium ions in wastewater flowing into the collective sewage treatment plant in Nowy Targ. The research was carried out in 2016 and 2017, where in the period of 24 months a total number of 87 wastewater samples were collected in order to determine the concentration of the analyzed pollution indicators. During this period, the average daily inflow of wastewater to the sewage treatment plant was also analyzed. Based on the analysis of linear correlation, it was stated that there is a high dependence of concentrations of organic and biogenic pollutants on the amount of inflowing raw wastewater. Furthermore, it was found that there is an average dependence of chromium ion concentrations in raw wastewater on the amount of inflowing wastewater. In order to minimize the high variability of the concentration of pollutants in raw wastewater, it is recommended to reconstruct the sewerage system from the combined sewer system to the distribution system. Additionally, it is recommended to monitor the sewerage network in order to eliminate illegal inflows of rainwater and industrial wastewater from furrier’s production facility.

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