Biological or Chemico-Physical Landfill Leachate Purification - An Alternative or a Useful Combination

1992 ◽  
Vol 26 (1-2) ◽  
pp. 137-145 ◽  
Author(s):  
J. T. Kettern
Keyword(s):  
Landfill Leachate ◽  
State Of The Art ◽  
Engineering Practice ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Different Types ◽  
Recent Developments ◽  
Minimum Requirements

The passing of the “General Administrative Regulations on Minimum Requirements for the Discharge of Sewage to Waters”, and particularly Annex 51, has far-reaching implications for landfill leachate treatment. The administrative regulations prescribe limits which entail treatment according to good engineering practice and state-of-the-art technology. The paper describes leachates from different types of landfill, discusses state-of-the-art leachate treatment technology and presents some recent developments.

Integrated Leachate Treatment Technology

2020 ◽  
pp. 204-220
Author(s):  
Zawawi Daud ◽  
Halizah Awang
Keyword(s):  
Organic Compounds ◽  
Landfill Leachate ◽  
Combined Treatment ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Chemical Treatments ◽  
Physico Chemical ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Pre Treatment

In this chapter, the performance of combined treatment of municipal landfill leachate is reviewed. Although individual physico-chemical treatments are suitable for the removal of heavy metals and hydrolyzation of some organic compounds, a combination of two physico-chemical treatments or physico-chemical and biological is required for optimum treatment of stabilized landfill leachate. A combination of two physico-chemical treatments can give optimum results in removal of recalcitrant organic compounds from stabilized leachate, as reflected by a significant decrease of the COD values after treatment. On the other hand, a combination of physico-chemical and biological treatments is required to achieve effective removal of NH3-N and COD with a substantial amount of biodegradable organic matter. In many cases, physico-chemical treatments are suitable for pre-treatment of stabilized leachate. The objective of this paper is to highlight various types of integrated leachate treatments as it has been difficult to get optimum efficiency from single approached treatment.

The Experimental Study on Landfill Leachate Treatment by Coagulation-Sedimentation + Electro-Oxidation Joint Reactor

2013 ◽  
Vol 295-298 ◽  
pp. 1472-1477
Author(s):  
Tao Yu ◽  
Tao Huang ◽  
Yin Xi Pan ◽  
Lin Hai Yang
Keyword(s):  
Landfill Leachate ◽  
Elimination Rate ◽  
Ammonia Nitrogen ◽  
Effluent Water ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Electro Oxidation ◽  
Electro Coagulation ◽  
Oxidation Reactor ◽  
Nitrogen Elimination

The technology used the coagulation-sedimentation + electro-oxidation joint reactor has been studied to treat landfill leachate. First adding FeCl30.4g/L into all leachate for coagulation and sedimentation, its CODcr elimination rate can achieve 35%, but does have no effect on ammonia nitrogen. Then using electro-oxidation reactor to deal with effluent water, the reaction order of electro-oxidation reactor is first-level, as the reaction conditions are 20mA/cm2 of electric current density, 140min of reaction time, the leachate CODcr elimination rate can reach to above 90%, the ammonia nitrogen elimination rate meets to 98% around. Using coagulation-sedimentation + electro coagulation joint reactor to treat landfill leachate can get stable effluent water quality with good treatment effect, has very high elimination efficiency of CODcr and ammonia nitrogen. It is a suitable treatment technology for landfill leachate.

scholarly journals Liquid-Based Reconfigurable Antenna Technology: Recent Developments, Challenges and Future

2020 ◽  
Author(s):  
Habshah Abu Bakar ◽  
Rosemizi Abd Rahim ◽  
Ping Jack Soh ◽  
Prayoot Akkaraekthalin
Keyword(s):  
High Frequency ◽  
Communication Systems ◽  
Room Temperature ◽  
State Of The Art ◽  
Reconfigurable Antennas ◽  
Wireless Communication Systems ◽  
Dielectric Resonators ◽  
Different Types ◽  
Recent Developments ◽  
Basic Approaches

Advances in reconfigurable liquid-based reconfigurable antennas are enabling new possibilities to fulfil the requirements of more advanced wireless communication systems. In this review, a comparative analysis of various state-of-the-art concepts and techniques for designing reconfigurable antennas using liquid is presented. First, the electrical properties of different liquids at room temperature commonly used in reconfigurable antennas are identified. This is followed by a discussion of various liquid actuation techniques in enabling high frequency reconfigurability. Next, liquid-based reconfigurable antennas in literature used to achieve the different types of reconfiguration will be critically reviewed. These include frequency-, polarization-, radiation pattern- and compound reconfigurability. The current concepts of liquid-based reconfigurable antennas can be classified broadly into three basic approaches: altering the physical (and electrical) dimensions of antennas using liquid, applying liquid-based sections as reactive loads; and implementation of liquids as dielectric resonators. Each concept and their design approaches will be examined, outlining their benefits, limitations, and possible future improvements.

Biological Treatment Technology for Landfill Leachate

2015 ◽  
pp. 219-249
Author(s):  
Husnul Azan Bin Tajarudin ◽  
Mohd Firdaus Bin Othman ◽  
Noor Aziah Binti Serri ◽  
Muhammad Redzwan Bin Tamat
Keyword(s):  
Landfill Leachate ◽  
Biological Treatment ◽  
Biological Process ◽  
Low Cost ◽  
New Technology ◽  
Environmentally Friendly ◽  
Biological Processes ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Environmental Preservation

Biological process for environmental preservation and treatment is not a new technology. It was used a decade ago until now. The most important tools in biological processes are the microorganism and upstream instruments (bioreactor, pond and others) to run the process. Furthermore, the efficiency of the process depends on many factors such as temperature, pH, type of microorganism, conditions, and other nutrients. To understand the factors that will affect the process, mechanisms of microorganisms to treat or protect the environment must be considered. For leachate treatment, biological process is one of the most widely used techniques for low cost and environmentally friendly.

scholarly journals Liquid-Based Reconfigurable Antenna Technology: Recent Developments, Challenges and Future

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 827
Author(s):  
Habshah Abu Bakar ◽  
Rosemizi Abd Rahim ◽  
Ping Jack Soh ◽  
Prayoot Akkaraekthalin
Keyword(s):  
High Frequency ◽  
Communication Systems ◽  
Room Temperature ◽  
State Of The Art ◽  
Reconfigurable Antennas ◽  
Wireless Communication Systems ◽  
Dielectric Resonators ◽  
Different Types ◽  
Recent Developments ◽  
Basic Approaches

Advances in reconfigurable liquid-based reconfigurable antennas are enabling new possibilities to fulfil the requirements of more advanced wireless communication systems. In this review, a comparative analysis of various state-of-the-art concepts and techniques for designing reconfigurable antennas using liquid is presented. First, the electrical properties of different liquids at room temperature commonly used in reconfigurable antennas are identified. This is followed by a discussion of various liquid actuation techniques in enabling high frequency reconfigurability. Next, the liquid-based reconfigurable antennas in literature used to achieve the different types of reconfiguration will be critically reviewed. These include frequency-, polarization-, radiation pattern-, and compound reconfigurability. The current concepts of liquid-based reconfigurable antennas can be classified broadly into three basic approaches: altering the physical (and electrical) dimensions of antennas using liquid; applying liquid-based sections as reactive loads; implementation of liquids as dielectric resonators. Each concept and their design approaches will be examined, outlining their benefits, limitations, and possible future improvements.

Integrated Leachate Treatment Technology

2015 ◽  
pp. 332-348
Author(s):  
Zawawi Daud ◽  
Halizah Awang
Keyword(s):  
Organic Compounds ◽  
Landfill Leachate ◽  
Combined Treatment ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Chemical Treatments ◽  
Physico Chemical ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Pre Treatment

In this chapter, the performance of combined treatment of municipal landfill leachate is reviewed. Although individual physico-chemical treatments are suitable for the removal of heavy metals and hydrolyzation of some organic compounds, a combination of two physico-chemical treatments or physico-chemical and biological is required for optimum treatment of stabilized landfill leachate. A combination of two physico-chemical treatments can give optimum results in removal of recalcitrant organic compounds from stabilized leachate, as reflected by a significant decrease of the COD values after treatment. On the other hand, a combination of physico-chemical and biological treatments is required to achieve effective removal of NH3-N and COD with a substantial amount of biodegradable organic matter. In many cases, physico-chemical treatments are suitable for pre-treatment of stabilized leachate. The objective of this paper is to highlight various types of integrated leachate treatments as it has been difficult to get optimum efficiency from single approached treatment.

Leachate Generation and Control at Landfill Disposal Sites

1985 ◽  
Vol 20 (3) ◽  
pp. 10-24 ◽  
Author(s):  
Frederick G. Pohland ◽  
Stephen R. Harper ◽  
Ker-Chi Chang ◽  
Joseph T. Dertien ◽  
Edward S. K. Chian
Keyword(s):  
Simulation Study ◽  
Landfill Leachate ◽  
State Of The Art ◽  
Treatment Options ◽  
The State ◽  
Leachate Treatment ◽  
Landfill Management ◽  
And Control ◽  
Landfill Disposal

Abstract A two-part overview of the state-of-the-art in landfill management is presented with emphasis on the production and characteristics of landfill leachate and gas and methods for control and treatment. The patterns of production of landfill leachate and gas are illustrated with results from a landfill simulation study with and without leachate recycle. Leachate treatment options are summarized and fortified by information derived from selected literature reports.

Review of recent trends in gas sensing technologies and their miniaturization potential

Sensor Review ◽  
2014 ◽  
Vol 34 (1) ◽  
pp. 24-35 ◽  
Author(s):  
Sari Lakkis ◽  
Rafic Younes ◽  
Yasser Alayli ◽  
Mohamad Sawan
Keyword(s):  
Design Methodology ◽  
Gas Sensing ◽  
State Of The Art ◽  
The State ◽  
Content Type ◽  
Novel Technologies ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Recent Developments ◽  
Recent Trends

Purpose – This paper aims to give an overview about the state of the art and novel technologies used in gas sensing. It also discusses the miniaturization potential of some of these technologies in a comparative way. Design/methodology/approach – In this article, the authors state the most of the methods used in gas sensing discuss their advantages and disadvantages and at last the authors discuss the ability of their miniaturization comparing between them in terms of their sensing parameters like sensitivity, selectivity and cost. Findings – In this article, the authors will try to cover most of the important methods used in gas sensing and their recent developments. The authors will also discuss their miniaturization potential trying to find the best candidate among the different types for the aim of miniaturization. Originality/value – In this article, the authors will review most of the methods used in gas sensing and discuss their miniaturization potential delimiting the research to a certain type of technology or application.

scholarly journals Molecular weight distribution of pollutants in leachate from full scale landfill site

2016 ◽  
Vol 18 (2) ◽  
pp. 360-370
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Landfill Leachate ◽  
Weight Distribution ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Treatment Processes ◽  
Appropriate Treatment

<div> <p>The main objective of this study was to investigate the differences between the main pollutants in young and intermediate age landfill leachate in terms of molecular weight distribution (MWD). Parameters of chemical oxygen demand (COD), five day - biochemical oxygen demand (BOD<sub>5</sub>), ultraviolet-visible spectrophotometry (UV-VIS spectrum), total kjehldahl nitrogen (TKN), ammonia nitrogen (NH<sub>4</sub>-N) and colour were fractioned by membranes with the nominal pore size of 1&micro;m, 0.05 &micro;m, 100 kDa, 50 kDa, 10 kDa, 1 kDa and 0.5 kDa. According to the MWD results appropriate treatment technology could be choosen easily. According to the MWD results the ratio of soluble fractions (&lt; 0.5 kDa) to total COD was 34% in young leachate (YL), whereas low molecular weight (MW) fractions were dominant in intermediate leachate (IL) having this ratio of 71%. Presence of lower MW compounds in IL was also confirmed with UV-VIS absorbance spectra and its spectrum was higher than the YL. According to the specific ultraviolet absorption (SUVA) values, the organic contents of all of these processes were hydrophilic. TKN and NH<sub>4</sub>-N analysis showed that in IL all the nitrogen present is in ammoniacal form, instead in YL there is still the presence of organic nitrogen. Furthermore more than half of the TKN was less than 0.5 kDa while 6 % and 16 % TKN found in wastewater from IL and YL was higher than 1 &micro;m respectively. The observations of this study may provide useful criteria to choose a suitable landfill leachate treatment processes.</p> </div> <p>&nbsp;</p>

Biological Treatment Technology for Landfill Leachate

2020 ◽  
pp. 775-806
Author(s):  
Husnul Azan Bin Tajarudin ◽  
Mohd Firdaus Bin Othman ◽  
Noor Aziah Binti Serri ◽  
Muhammad Redzwan Bin Tamat
Keyword(s):  
Landfill Leachate ◽  
Biological Treatment ◽  
Biological Process ◽  
Low Cost ◽  
New Technology ◽  
Environmentally Friendly ◽  
Biological Processes ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Environmental Preservation

Biological process for environmental preservation and treatment is not a new technology. It was used a decade ago until now. The most important tools in biological processes are the microorganism and upstream instruments (bioreactor, pond and others) to run the process. Furthermore, the efficiency of the process depends on many factors such as temperature, pH, type of microorganism, conditions, and other nutrients. To understand the factors that will affect the process, mechanisms of microorganisms to treat or protect the environment must be considered. For leachate treatment, biological process is one of the most widely used techniques for low cost and environmentally friendly.

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