scholarly journals Performance Evaluation of Trickling Filter and Extended Aeration of Wastewater Treatment Plants

2020 ◽  
Vol 26 (3) ◽  
pp. 93-99
Author(s):  
Saad Naif Awad ◽  
Basim Hussein Khudair Al-Obaidi
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Environment And Public Health ◽  
Direct Impact ◽  
Trickling Filter ◽  
Suspended Growth ◽  
Before And After ◽  
Growth System ◽  
Aeration Plant ◽  
Over Time

In recent decades, there has been increasing interest in wastewater treatment because of its direct impact on the environment and public health. Over time, other forms of treatment have been developed and modified, including extended aeration. This process is included in the suspended growth system. In this paper, a comparative study was conducted between the efficiency of the extended aeration plant and that of the trickling filter plant in removal of BOD and COD.  The method of comparison was done by knowing the value of the pollutant before and after the treatment and then extract the removal ratio of each pollutant within each plant. The results showed that the percentage of removal of BOD in the trickling filter was 79.5% while in extended aeration was 90.7%. The efficiency of COD removal was 60% in trickling filter and 86% in extended aeration.  The study was carried out at the Barrakiyah WWTP in Najaf province in Iraq. As the plant contains these two types of treatment, and the study has been achieved through monthly examinations over a full year.

The Staging of Large Wastewater Treatment Plants - A “Modular” Approach

1992 ◽  
Vol 25 (4-5) ◽  
pp. 67-73
Author(s):  
H. Fleckseder ◽  
L. Prendl ◽  
H. Meulenbroek
Keyword(s):  
Wastewater Treatment ◽  
Driving Force ◽  
Wastewater Treatment Plants ◽  
Aeration Tank ◽  
Modular Approach ◽  
Central European ◽  
Plant Hydraulics ◽  
The World ◽  
Whole Life Cycle ◽  
Over Time

The primary driving force for re-investments in wastewater treatment plants in Austria - and also other countries in Central Europe - is at present not an increase in load to treatment but a marked increase in effluent requirements to be fulfilled. (The re-investments necessary for sludge handling and treatment remain outside this paper.) Within a period of 20 years, the load specific requirements on aeration tank volume rose five- to tenfold, when Lv = 2.0 kg BOD5/(m3d) was the starting value, and roughly doubled for final clarifiers. In addition, the importance of the application and expansion of primary sedimentation decreased as well. This development over time in Central European countries as well as the need to utilize previous investments as long as possible - 35 to 60 years for civil works are common as periods of depreciation - indicate that investments in new plant at any location in the world have to consider the possible whole life cycle of a plant and that plant hydraulics becomes the “key hook” for expandability.

Review on biological wastewater treatment and resources recovery: attached and suspended growth systems

2019 ◽  
Vol 80 (11) ◽  
pp. 2013-2026 ◽  
Author(s):  
Lakshmi Machineni
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Film Growth ◽  
Value Added ◽  
Microbial Consortia ◽  
Biological Wastewater Treatment ◽  
Suspended Growth ◽  
Growth System ◽  
Pure Cultures ◽  
Biological Methods

Abstract The treatment of wastewater for reuse is a potential solution to meet ever increasing urban, industrial, agricultural, and environmental demands across the world, where clean water availability is scarce. There are several traditional wastewater treatment processes that offer varying degrees of effectiveness in addition to presenting environmental, economic, and social disadvantages. Development of promising and inexpensive technologies to provide the reusable water in needful amounts using wastewaters as a cheap source of key nutrients and organic matter is required. Wastewater treatment by biological methods is becoming more important in the light of recovering value-added plant nutrients, heavy metals, biosolids, and bioenergy resources. Different types of solid contaminants in effluents can be removed simultaneously by pure cultures or mixed microbial consortia. Based on the structural organization of microbial biomass, biological treatment systems are classified into two types: dispersed growth system and attached growth system. Biological treatment methods associated with fixed-film growth have been recognized as highly effective and more energy efficient than suspended growth systems. This review discusses the recent breakthroughs in advanced biological wastewater treatment using both the systems, and also focuses on key energetic resources recovery driven by biological technologies.

Effectiveness of measures adopted for the reduction of nonylphenol emission in European river basins: a case study of the River Lambro, Northern Italy

Water Policy ◽  
2015 ◽  
Vol 17 (6) ◽  
pp. 1176-1190
Author(s):  
Marianna Rusconi ◽  
Luisa Patrolecco ◽  
Sara Valsecchi ◽  
Stefano Polesello
Keyword(s):  
Wastewater Treatment ◽  
Adriatic Sea ◽  
Wastewater Treatment Plants ◽  
River Basins ◽  
Northern Italy ◽  
Hazardous Substances ◽  
Industrial District ◽  
Before And After ◽  
River Po

According to the Water Framework Directive 2000/60/EC, nonylphenol (NP) has been included in the list of priority hazardous substances and subject to cessation or phasing out of discharges, emissions and losses within an appropriate timetable not exceeding 20 years. The present work analyzed monitoring data on NP and its precursors (mono- and di-ethoxylates, nonylphenol-mono-ethoxylate and nonylphenol-di-ethoxylate) collected in a highly impacted river basin in Northern Italy in order to assess the effectiveness of the adopted measures for NP reduction, during two monitoring campaigns in 2003/04 and 2009/10, respectively, before and after the entry into operation of three new wastewater treatment plants (WWTPs) in Milan. The River Lambro is the main source of pollutants also for the River Po and the Adriatic Sea. Data collected in the present work showed that in the last 7 years the reduction of the different analytes was from 70% to 90%. Most of the reduction can be attributed to the substitution of nonylphenolethoxylates in industrial uses as demonstrated by a survey in the textile industrial district. The entry into operation of the new municipal WWTPs in Milan contributes about 10% of the reduction of the total NP load discharged by the River Lambro.

Upgrading of Wastewater Treatment Plants for the Reduction of Nitrogen and Phosphorus in Schleswig-Holstein, FRG

1990 ◽  
Vol 22 (7-8) ◽  
pp. 69-76
Author(s):  
C. F. Seyfried ◽  
E. Dammann
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Trickling Filter ◽  
The Baltic Sea ◽  
Nitrogen And Phosphorus ◽  
The North ◽  
The North Sea ◽  
Standard Values ◽  
The Baltic ◽  
Activated Sludge Processes

In order to solve the problems occurring in the North Sea and the Baltic Sea, programmes for the reduction of nutrients in wastewater treatment plants were initiated in the Schleswig-Holstein region. In 1988, all wastewater treatment plants with capacities greater than 17 000 population equivalents were upgraded for phosphate reduction, to give effluent concentrations of less than 2 mg P/l. By 1995, standard values of Ntot < 10 mg/l and P < 0.5 mg/l are expected. Designs for the expansion of several wastewater treatment plants are presented in this paper. In particular, the problems which result from seasonal peaks, high phosphorus concentrations, and the combination of trickling filter and activated sludge processes are discussed.

Performance of very small wastewater treatment plants with pronounced load variations

2007 ◽  
Vol 55 (7) ◽  
pp. 31-38 ◽  
Author(s):  
J. Kegebein ◽  
E. Hoffmann ◽  
H.H. Hahn
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Oxygen Uptake Rate ◽  
Trickling Filter ◽  
Load Variations ◽  
First Order ◽  
Wastewater Systems ◽  
Specific Oxygen Uptake Rate ◽  
Wastewater Generation ◽  
Break Period

The operation of very small biological wastewater systems is strongly influenced by the patterns of wastewater generation. The absence of people in the connected building(s) during holidays or off-season leads to a system underload, other circumstances however may lead to an overload. Experiments have been carried out to display the effects of no-feed conditions on activated sludge biomass and its microbial activity during a 24 hour period after re-feeding. The decrease of the biomass during idle periods can be modelled by a first order equation. The initial specific oxygen uptake rate (OUR) of the remaining biomass decreased with the duration of the preceding no-feed sequence. Four different laboratory-scale treatment plants were operated to demonstrate the system performance when re-started after a break period of 24 and 52 days respectively. The effluent concentration after a break of 52 days had not been sufficient as compared to the discharge requirements given by German laws. In addition a full scale trickling filter was monitored, while the connected building accommodated a maximum of 40 guests interrupted by times with no guest at all. Conclusions are drawn from the experimental results and from literature, giving some hints on how to manage the impacts of varying loads at very small wastewater treatment plants.

Bioavailable and biodegradable dissolved organic nitrogen in activated sludge and trickling filter wastewater treatment plants

2013 ◽  
Vol 47 (9) ◽  
pp. 3201-3210 ◽  
Author(s):  
Halis Simsek ◽  
Murthy Kasi ◽  
Jae-Bom Ohm ◽  
Mark Blonigen ◽  
Eakalak Khan
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Dissolved Organic Nitrogen ◽  
Organic Nitrogen ◽  
Wastewater Treatment Plants ◽  
Trickling Filter

scholarly journals On the possibility of using biological toxicity tests to monitor the work of wastewater treatment plants

2008 ◽  
Vol 60 (3) ◽  
pp. 431-436
Author(s):  
Jelena Zoric ◽  
V. Simic ◽  
Ana Petrovic
Keyword(s):  
Wastewater Treatment ◽  
Acute Toxicity ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Test Organism ◽  
Toxicity Tests ◽  
Brachydanio Rerio ◽  
Toxic Pollutants ◽  
Biological Toxicity ◽  
Before And After

The aim of this study was to ascertain the possibility of using biological toxicity tests to monitor influent and effluent wastewaters of wastewater treatment plants. The information obtained through these tests is used to prevent toxic pollutants from entering wastewater treatment plants and discharge of toxic pollutants into the recipient. Samples of wastewaters from the wastewater treatment plants of Kragujevac and Gornji Milanovac, as well as from the Lepenica and Despotovica Rivers immediately before and after the influx of wastewaters from the plants, were collected between October 2004 and June 2005. Used as the test organism in these tests was the zebrafish Brachydanio rerio Hamilton - Buchanon (Cyprinidae). The acute toxicity test of 96/h duration showed that the tested samples had a slight acutely toxic effect on B. rerio, except for the sample of influent wastewater into the Cvetojevac wastewater treatment plant, which had moderately acute toxicity, indicating that such water should be prevented from entering the system in order to eliminate its detrimental effect on the purification process.

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