Particle related fractionation and characterisation of municipal wastewater

2004 ◽  
Vol 50 (12) ◽  
pp. 125-132 ◽  
Author(s):  
A.F. van Nieuwenhuijzen ◽  
J.H.J.M. van der Graaf ◽  
M.J. Kampschreur ◽  
A.R. Mels
Keyword(s):  
Particle Size ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Quality Parameters ◽  
Particle Sizes ◽  
Particle Removal ◽  
Treatment Techniques ◽  
Physical Chemical ◽  
Pre Treatment ◽  
Insight Into

Several studies show that a more detailed characterisation of the particulate matter in municipal wastewater gives a better understanding and prediction of removal efficiencies of physical-chemical treatment techniques and the application of optimal chemical dosages. Such a characterisation should include the distribution of contaminants over various particle sizes. This article describes a method and results of experimental and full-scale investigations, conducted to determine how contaminants in wastewater are distributed over different particle sizes. For this purpose, particle size fractionations of wastewater influents originating from more than thirteen WWTP were carried out. One of these fractionations (WWTP Venray) is shown and interpreted in this article. First, the wastewaters were fractionated into 5 to 6 particle fractions (45, 5.0, 1.0/1.2, 0.45 and 0.1 μm) after which the fractions were analyzed for various water quality parameters like organic components, nutrients, salts, solids and turbidity. Based on the results the effects of removal of the different size fractions on design of the biological treatment and energy balance of a wastewater treatment plant can be assessed. The method also indicates whether a certain wastewater is efficiently treatable with physical-chemical pre-treatment methods. It is concluded wastewater fractionation on particle size is very useful, but that wastewater characteristics and particle size distributions should not be generalised, but have to be interpreted as indications for a certain average wastewater composition. To give more insight into the distribution of contaminants over particle size and the particle removal potential, a specific wastewater fractionation has to be carried out per WWTP.

Performance of hybrid small wastewater treatment system consisting of jet mixed separator and rotating biological contactor

1997 ◽  
Vol 35 (6) ◽  
pp. 63-70 ◽  
Author(s):  
Yoshimasa Watanabe ◽  
Yoshihiko Iwasaki
Keyword(s):  
Wastewater Treatment ◽  
Electric Power ◽  
Hybrid System ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Treatment System ◽  
Municipal Wastewater Treatment ◽  
Wastewater Treatment System ◽  
Pre Treatment ◽  
Organic Particles

This paper describes a pilot plant study on the performance of a hybrid small municipal wastewater treatment system consisting of a jet mixed separator(JMS) and upgraded RBC. The JMS was used as a pre-treatment of the RBC instead of the primary clarifier. The treatment capacity of the system was fixed at 100 m3/d, corresponding to the hydraulic loading to the RBC of 117 L/m2/d. The effluent from the grid chamber at a municipal wastewater treatment plant was fed into the hybrid system. The RBC was operated using the electric power produced by a solar electric generation panel with a surface area of 8 m2 under enough sunlight. In order to reduce the organic loading to the RBC, polyaluminium chloride(PAC) was added to the JMS influent to remove the colloidal and suspended organic particles. At the operational condition where the A1 dosage and hydraulic retention time of the JMS were fixed at 5 g/m3 and 45 min., respectively, the average effluent water quality of hybrid system was as follows: TOC=8 g/m3, Total BOD=8 g/m3, SS=8 g/m3, Turbidity=6 TU, NH4-N=7 g/m3, T-P=0.5 g/m3. In this operating condition, electric power consumption of the RBC for treating unit volume of wastewater is only 0.07 KWH/m3.

Tertiary filtration in small wastewater treatment plants

2007 ◽  
Vol 55 (7) ◽  
pp. 219-225 ◽  
Author(s):  
V. Naddeo ◽  
V. Belgiorno
Keyword(s):  
Particle Size ◽  
Wastewater Treatment ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Wastewater Treatment Plants ◽  
Rotating Disk ◽  
Quality Parameters ◽  
Particle Removal ◽  
Sand Filters ◽  
Filter Performance

Tertiary filtration can be proposed in small wastewater treatment plants with impact on protected water bodies. Rotating disk filters may be adopted, in respect to conventional sand filters, when low availability of space and low investment costs are the prevailing conditions. The overall objective of this research was to evaluate the filtration efficiency of rotating disk filters; to compare effectiveness with traditional sand filters; to analyse thoroughly the importance of particle size distribution in wastewater tertiary filtration. In the experimental activity, conventional wastewater quality parameters were investigated and particle size distribution (PSD) was characterized to discuss the filter effectiveness. The effect of design and operation parameters of tertiary filters were discussed related to particle removal curves derived from particles counts. Analysis of particle size distribution can be very useful to help comprehension of filtration processes, design of filtration treatments and to decide the best measures to improve filter performance.

Strategies for the reduction of Legionella in biological treatment systems

2016 ◽  
Vol 74 (4) ◽  
pp. 816-823 ◽  
Author(s):  
R. Nogueira ◽  
K.-U. Utecht ◽  
M. Exner ◽  
W. Verstraete ◽  
K.-H. Rosenwinkel
Keyword(s):  
Legionella Pneumophila ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Cooling System ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Micro Particles ◽  
Treated Effluent ◽  
Wastewater Stream ◽  
Insight Into

A community-wide outbreak of Legionnaire's disease occurred in Warstein, Germany, in August 2013. The epidemic strain, Legionella pneumophila Serogruppe 1, was isolated from an industrial wastewater stream entering the municipal wastewater treatment plant (WWTP) in Wartein, the WWTP itself, the river Wäster and air/water samples from an industrial cooling system 3 km downstream of the WWTP. The present study investigated the effect of physical–chemical disinfection methods on the reduction of the concentration of Legionella in the biological treatment and in the treated effluent entering the river Wäster. Additionally, to gain insight into the factors that promote the growth of Legionella in biological systems, growth experiments were made with different substrates and temperatures. The dosage rates of silver micro-particles, hydrogen peroxide, chlorine dioxide and ozone and pH stress to the activated sludge were not able to decrease the number of culturable Legionella spp. in the effluent. Nevertheless, the UV treatment of secondary treated effluent reduced Legionella spp. on average by 1.6–3.4 log units. Laboratory-scale experiments and full-scale measurements suggested that the aerobic treatment of warm wastewater (30–35 °C) rich in organic nitrogen (protein) is a possible source of Legionella infection.

Particle size analysis as a tool for performance measurements in high rate effluent filtration

2001 ◽  
Vol 43 (10) ◽  
pp. 303-311 ◽  
Author(s):  
J. H. J. M. van der Graaf ◽  
J. de Koning ◽  
J. Tang
Keyword(s):  
Particle Size ◽  
Wastewater Treatment ◽  
Membrane Filtration ◽  
Suspended Solids ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Size Analysis ◽  
Particle Removal ◽  
Deep Bed Filtration ◽  
Filter Performance

In the Netherlands almost all wastewater treatment plants have been redesigned and adapted in order to remove nitrogen, phosphorus and suspended solids to a very low level. The improved effluent quality leads to a growing interest in the reuse of effluent of the modernised wastewater treatment plants. This again results in investigations on filtration techniques as deep bed filtration and membrane filtration. At the wastewater treatment plant Ede research was done on deep bed filtration in order to develop relations between particle removal and filter performance and to explore ways of optimization. The results of the experiments are rather typical for effluent of modern Dutch wastewater treatment plants. The very low concentrations of suspended solids and precipitable substances result in poor flocculating properties. From turbidity measurements it may be concluded that the best results were obtained with a dosage of flocculant. However, the particle size measurements indicated the opposite. Suspended solids calculations, based on the particle volume distributions, showed a better removal without a dosage of flocculant. From this it is concluded that a dosage of coagulant (Fe3+ or Al3+) has an adverse effect on the removal efficiencies even at low dosages (1 mg/l).

Evaluation of moving bed sand filter for denitrification, suspended solids removal and very low effluent total phosphorus concentrations

2019 ◽  
Vol 80 (2) ◽  
pp. 232-242
Author(s):  
S. S. Rathnaweera ◽  
B. Rusten ◽  
L. D. Manamperuma ◽  
J. Gjevre ◽  
I. Tranum
Keyword(s):  
Total Phosphorus ◽  
Nitrogen Removal ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Particle Removal ◽  
Sand Filter ◽  
Moving Bed ◽  
Wwtp Effluent ◽  
Final Effluent

Abstract Continuously flushing moving bed sand filter was operated in pilot scale for phosphorus (P) and nitrogen removal with simultaneous particle removal. The wastewater tested was either final effluent from a municipal wastewater treatment plant (WWTP) with nitrogen removal in moving bed biofilm reactors (MBBRs) followed by coagulation and dissolved air flotation (DAF) for P and suspended solids (SS) removal, or different mixtures of this final effluent and effluent from the MBBR-stage. The study focused on the applicability to achieve low total phosphorus (TP) concentrations (below 0.1 mg/L) and suspended solids concentrations (below 10 mg SS/L), plus good denitrification (removal rate over 750 g NO3-N/m3-d), by treating wastewater having variable concentrations of TP (from 0.19 to 7.3 mg/L), SS (from 3 to 169 mg/L) and total nitrogen (from 8 to 27 mg/L). The target effluent TP limit was easily achieved when adding coagulant to WWTP effluent. With correct coagulant dose (Al/TP-molar ratio >4) and good particle removal the target effluent TP could also be reached when treating mixed WW with fairly high influent TP. Very high denitrification rates were achieved with adequate influent P concentration and external carbon source. Low denitrification rates were observed when limited by low concentrations of biodegradable carbon and phosphorus.

scholarly journals The use of constructed wetlands for the treatment of industrial wastewater

2017 ◽  
Vol 34 (1) ◽  
pp. 233-240 ◽  
Author(s):  
Katarzyna Skrzypiecbcef ◽  
Magdalena H. Gajewskaad
Keyword(s):  
Constructed Wetlands ◽  
Industrial Wastewater ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Municipal Wastewater Treatment ◽  
Treatment Wetland ◽  
Oil Processing ◽  
Pollutants Removal ◽  
Pre Treatment

Abstract Constructed wetlands are characterized by specific conditions enabling simultaneous various physical and biochemical processes. This is the result of specific environment for the growth of microorganisms and hydrophytes (aquatic and semiaquatic plants) which are capable of living in aerobic, anaerobic and facultative anaerobic conditions. Their interaction contributes to the intensification of oxidation and reduction responsible for the removal and retention of pollutants. These processes are supported by sorption, sedimentation and assimilation. Thanks to these advantages, treatment wetland systems have been used in communal management for over 50 years. In recent years, thanks to its advantages, low operational costs and high removal efficiency, there is growing interest in the use of constructed wetlands for the treatment or pre-treatment of various types of industrial wastewater. The study analyzes current use of these facilities for the treatment of industrial wastewater in the world. The conditions of use and efficiency of pollutants removal from readily and slowly biodegradable wastewater, with special emphasis on specific and characteristic pollutants of particular industries were presented. The use of subsurface horizontal flow beds for the treatment of industrial wastewater, among others from crude oil processing, paper production, food industry including wineries and distillery, olive oil production and coffee processing was described. In Poland constructed wetlands are used for the treatment of sewage and sludge from milk processing in pilot scale or for dewatering of sewage sludge produced in municipal wastewater treatment plant treating domestic sewage with approximately 40% share of wastewater from dairy and fish industry. In all cases, constructed wetlands provided an appropriate level of treatment and in addition the so-called ecosystem service.

scholarly journals Causes and remedies for filamentous foaming in activated sludge treatment plant

2014 ◽  
Vol 16 (4) ◽  
pp. 762-772 ◽  
Keyword(s):  
Activated Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Mycolic Acid ◽  
Foam Formation ◽  
Activated Sludge Process ◽  
Polymer Addition ◽  
Physical Chemical ◽  
Biological Methods

<p>This paper reviews the problem of foaming associated with the activated sludge process and its control using various physical, chemical and biological methods. Activated sludge process is widely used for treatment of every type of wastewater like industrial, domestic and municipal wastewater. This process is driven by a complex microbial population, among which some mycolic acid containing bacteria leads to the stable foam formation which ultimately results in poor efficiency of the plants and leading to major environmental, operational, and health problems. A number of researches provide the evidences of foaming in wastewater treatment plants and its control using physical, chemical and biological methods. Current approaches for controlling foam includes operational adjustments, additional structures, controlling dissolved oxygen levels, water sprays, steam application, polymer addition, chlorination and a novel and ecofriendly approach that is treatment of filamentous bacteria with the specific phages. A detailed study of all methods is presented and collectively described in this review paper for a better understanding of the foam controlling strategies.&nbsp;</p>

scholarly journals Advanced Purification of Industrial and Mixed Wastewater by Combined Membrance Filtration and Sonochemical Technologies

2017 ◽  
pp. 948-959
Author(s):  
Enrico Fatarella ◽  
Irene Cioni ◽  
Cecilia Caretti ◽  
Enrico Venturini degli Esposti ◽  
Ester Coppini
Keyword(s):  
Municipal Wastewater ◽  
Critical Role ◽  
Treatment Plant ◽  
Textile Wastewater ◽  
Chemical Oxidation ◽  
Municipal Wastewater Treatment ◽  
Textile Production ◽  
Combined Process ◽  
Pre Treatment ◽  
Finishing Processes

The textile sector plays a critical role in this context, because textile companies are large users of water - typically 0.2-0.5 m3 are needed to produce 1 kg of finished product [1] – and they are historically concentrated in districts (e.g. Prato in Italy) located in Southern Member States, such as Italy, Spain and Portugal, which are facing more and more longer periods of drought and therefore are strongly in the need to preserve the availability of water for potable use. The finishing processes (i.e. pre-treatment, dyeing, printing and special finishing) are especially polluting and resource consuming in terms of water, energy and chemicals. Almost the entire of water used in textile production is discharged and, on average, the effluents volume covers 90-95% of the water used [2]. According to that, a new Ultrafiltration/Sonichemical combined process has been investigated on textile wastewater by evaluating the reduction of the pollution load induced by physical separation and by chemical oxidation promoted by Ultrasound cavitation. The experimental campaign carried out at the Municipal Wastewater treatment Plant in Prato showed that the quality of the treated water reaches the target reported in literature [3] for textile manufacturing sectors. An estimation of the costs of the purified water has been assessed and the combined process seems to be promising for further development. The authors would like to thank the European Commission to funding this project (contract number LIFE07/IT/000439) within the LIFE+ Environmental Policy and Governance 2007 Programme.

Occurrence and Fate of Selected Heavy Metals in a Conventional Municipal Wastewater Treatment Plant in Kisumu City, Kenya

2019 ◽  
pp. 211-224
Author(s):  
Victor Odhiambo Shikuku ◽  
George O. Achieng'
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Potential Effect ◽  
Quality Parameters ◽  
Municipal Wastewater Treatment ◽  
Effluent Quality ◽  
Kisumu City ◽  
National Environmental

The objective of this work was to investigate the occurrence and fate of five heavy metals in water, sludge, and sediments from a conventional municipal wastewater treatment facility in Kisumu City, Kenya. The effluent quality was compared with the effluent quality parameters stipulated by the National Environmental Management Authority (NEMA) to assess the efficiency of the plant and potential effect of the discharged effluent on the recipient river. The levels of the heavy metals recorded in the sludge samples were significantly higher than those in the corresponding water samples. The order of the metal percentage removal efficiency (%R) from the treatment plant was Mg>Cu>Mn>Fe>Zn. It is concluded that the plant is a point source for Zn loading into the recipient waters which poses potential risk to end users downstream. The heavy metal-laden sludge was within permissible limits for utilization in agricultural lands.

scholarly journals Dewatering e bonifica dell’ area ˝ex Whitehead Motofides˝ (Pisa, Italia)

2014 ◽  
Vol 3 (4) ◽  
Author(s):  
Nicola Conti ◽  
Roberto Salvadori ◽  
Massimo Aiello
Keyword(s):  
Treatment Plant ◽  
Pollutant Removal ◽  
Organic Substances ◽  
Groundwater Treatment ◽  
Physical Chemical ◽  
Dry Conditions ◽  
Pre Treatment ◽  
Set Up ◽  
Iron Manganese ◽  
Soil Excavation

In 2007 the activities for the remediation of the “ex-Whitehead Motofides area” (in Marina di Pisa, Italy) started. In order to allow the contaminated soil excavation in dry conditions a dewatering system was necessary. The water pumped through this system was then treated in an adequate plant. Acque Industriali realized and managed the whole system. The dewatering system was made of suction pins fixed to a depth of 5.5 m, connected by a junction manifold to the suction and booster vacuum assisted pump, which allowed the groundwater release toward the plant. The treatment plant, entirely designed by Acque Industriali and called ITAM (Impianto di Trattamento Acque di Falda Mobile, which means movable groundwater treatment), was realized and set up at the end of 2008. It consisted of a pre-treatment section, made of reinforced concrete, prefabricated nitrogen sweep elements, and a physical chemical treatment plant, in a continuous loop, completely made on skid. The plant, with 25 m3/h of maximum potential, was able to remove possible sedimentable or in suspension material particles from water, iron, manganese, residual organic substances such as hydrocarbons, solvents (chlorinated and not), PCBs, and partly heavy metals. Totally, 98,167 m3 of groundwater were managed in about 25 months of activity. The analytic input and output results confirmed extremely high and satisfactory pollutant removal efficiency. The concentration values of the pollutants, in fact, were always lower than the limits imposed by law.

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