Removal of organic micro-pollutants from solid waste landfill leachate in membrane bioreactor operated without excess sludge discharge

2012 ◽  
Vol 66 (8) ◽  
pp. 1774-1780 ◽  
Author(s):  
V. Boonyaroj ◽  
C. Chiemchaisri ◽  
W. Chiemchaisri ◽  
K. Yamamoto
Keyword(s):  
Solid Waste ◽  
Landfill Leachate ◽  
Membrane Bioreactor ◽  
Hollow Fiber Membrane ◽  
Oxygen Demand ◽  
Disposal Site ◽  
Two Stage ◽  
Mixed Liquor ◽  
Aerobic Reactor ◽  
Micro Pollutants

Two-stage membrane bioreactor (MBR) system was applied to the treatment of landfill leachate from a solid waste disposal site in Thailand. The first stage anoxic reactor was equipped with an inclined tube module for sludge separation. It was followed by an aerobic stage with a hollow fiber membrane module for solid liquid separation. Mixed liquor sludge from the aerobic reactor was re-circulated back to anoxic reactor in order to maintain constant mixed liquor suspended solids (MLSS) concentration in the aerobic reactor. The removal of micro-pollutants from landfill leachate along the treatment period of 300 days was monitored. The results indicated that two-stage MBRs could remove biochemical oxygen demand (BOD), chemical oxygen demand (COD) and NH4+ by 97, 87 and 91% at steady operating condition. Meanwhile organic micro-pollutant removals were 50–76%. The removal efficiencies varied according to the hydrophobic characteristic of compounds but they were improved during long-term MBR operation without sludge discharge.

scholarly journals Characterization of Dissolved Organic Matter in Landfill Leachate during Two–Stage Membrane Bioreactor Treatment

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
S. Sanguanpak ◽  
C. Chiemchaisri ◽  
W. Chiemchaisri ◽  
K. Yamamoto
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Landfill Leachate ◽  
Membrane Bioreactor ◽  
Disposal Site ◽  
Solid Waste Disposal ◽  
High Concentration ◽  
Absorption Bands ◽  
Two Stage

Landfill leachate is a complex wastewater containing high concentration of dissolved organic matter (DOM). In this study, DOM in raw leachate and treated water from pilot–scale two–stage membrane bioreactor (MBR) installed at solid waste disposal site were investigated by using fractionation method, fluorescence excitation–emission matrix spectroscopy (FEEM) and fourier transform infrared (FTIR). The fractionation results showed hydrophilic (Hyl) compound was the most abundant fraction in DOM of raw leachate, whereas the dominant fraction of DOM in mixed liquor inside MBR and its effluent was fulvic acid (FA). The fluorescent peaks of protein-like, humic and fulvic–like substances were detected in influent DOM, while the fluorescence peaks of MBR and effluent DOM were humic and fulvic-like substances. From the FTIR results, absorption bands that could be related to humic acid (HA) and FA were found in both MBR and effluent DOM. The characterization of DOM indicated that the most of Hyl and protein–like substances could be significantly removed by microbial process in MBR. Furthermore, a part of humic substance (HA and FA) could be eliminated by microbial and filtration processes.

Effect of organic fouling on micro-pollutant rejection in membrane bioreactor treating municipal solid waste landfill leachate

2015 ◽  
Vol 72 (4) ◽  
pp. 561-571 ◽  
Author(s):  
Samunya Sanguanpak ◽  
Chart Chiemchaisri ◽  
Wilai Chiemchaisri ◽  
Kazuo Yamamoto
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Landfill Leachate ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Membrane Pore ◽  
Municipal Solid Waste Landfill ◽  
Waste Landfill ◽  
Micro Pollutants

Effect of membrane fouling on the removal of micro-pollutants from municipal solid waste landfill leachate, i.e. 4-methyl-2,6-di-tert-butylphenol (BHT), bisphenol A (BPA), and bis(2-ethylhexyl)phthalate (DEHP), in membrane bioreactor (MBR) was investigated. Modifications of membrane surface properties were analyzed to determine their relationship with their removals. Membrane fouling was simulated with foulants of different particle sizes on cellulose acetate (CA) microfiltration membrane to investigate the effect of foulant characteristics on BHT, BPA, and DEHP retention in the filtration experiment. The rejection efficiencies of the organic micro-pollutants in the MBR were 82–97% by fouled membrane, and 70–90% by cleaned membrane. The fouled membrane provided higher rejection of micro-pollutants from about 5% for BPA and BHT to 19% for DEHP. These improvements were due to the modification of membrane surface characteristics in terms of surface morphology, and contact angle after membrane fouling. The degree of rejection was found to be dependent upon the characteristics of foulant deposited on CA membrane surface. Increasing foulant particle size and its density shifted the mechanism of micro-pollutant rejection from membrane pore narrowing to pore blocking and cake formation while increasing pollutant adsorption capacity onto the foulant layer.

Performance and fouling characterization of a five-bore hollow fiber membrane in a membrane bioreactor for the treatment of printing and dyeing wastewater

2016 ◽  
Vol 87 (1) ◽  
pp. 102-109 ◽  
Author(s):  
Chunyan Ma ◽  
Xiaoqian Wu ◽  
Zhenhong Liu
Keyword(s):  
Hollow Fiber ◽  
Membrane Bioreactor ◽  
Hollow Fiber Membrane ◽  
Oxygen Demand ◽  
Dyeing Wastewater ◽  
Fiber Membrane ◽  
Step Method ◽  
Critical Flux ◽  
Printing And Dyeing Wastewater ◽  
Cake Layer

Filtration performance and fouling behavior of a five-bore hollow fiber membrane was investigated in a membrane bioreactor (MBR) treating printing and dyeing wastewater. A normal single-bore hollow fiber membrane module was used in the same bioreactor for comparison. During an operation over 30 days, the results of chemical oxygen demand (COD) and color removals demonstrated that the five-bore membrane was favorable for this wastewater treatment. The critical flux ( Jc) of the five-bore membrane and the single-bore membrane was determined at 21 and 15 L/(m2·h), respectively, using a flux-step method. During a steady running at sub-critical flux of 10 L/(m2·h) without cleaning for 50 days, the average increasing rates of trans-membrane pressure (TMP) for five-bore and single-bore membranes were 0.356 kPa/d and 0.444 kPa/d, respectively, indicating that the five-bore membrane had better fouling resistance. The total resistance values of five-bore membrane and single-bore membrane were 8.68 and 14.1 m−1, respectively. Scanning electron microscope (SEM) and atomic force microscope (AFM) results confirmed the cake layer resistance for five-bore membrane was much lower than single-bore membrane. It was expected that the membrane structure, especially the membrane diameter, influenced the anti-fouling property of five-bore membrane.

The use of extended aeration and in-series surface-flow wetlands for landfill leachate treatment

1995 ◽  
Vol 32 (3) ◽  
pp. 119-128 ◽  
Author(s):  
Craig D. Martin ◽  
Keith D. Johnson
Keyword(s):  
Solid Waste ◽  
Constructed Wetlands ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Surface Flow ◽  
Fecal Coliforms ◽  
Treatment Technique ◽  
Leachate Treatment ◽  
The Usa ◽  
Minimum Criteria

Recently in the USA, the Solid Waste Industry has undergone specific changes in landfill regulations. The Federal Resource Conservation and Recovery Acts (RCRA); and EPA subtitle D regulations, as well as stringent State regulations, impose minimum criteria for municipal solid waste facilities in the areas of location, operation, groundwater monitoring, and leachate management. In conjunction with these State and Federal mandates the University of West Florida developed a leachate treatment technique utilizing extended aeration and surface-flow constructed wetlands. Sampling of water quality has occurred monthly since February 1992. Parameters examined include: Nitrogen (NH3,), Total Suspended Solids (TSS), Total Phosphate (TPO4), Total Organic Carbon (TOC), pH, Alkalinity, and Chlorides. Chemical Oxygen Demand (COD), Total and Fecal Coliforms, Priority Pollutant Metals, and limited organic analytes are sampled on a less frequent basis. Samples are collected at a raw leachate site (L0), primary aerated lagoon (L1), and 6 stations within the 1.1 hectare constructed wetland complex (S1; W1; W3; W5; W7; W9) and one sandfilter (SF) location. Results thus far indicate removal percentages of the tested analytes average between 64% and 99%. This data suggests various physical, microbiological and chemical processes occurring within the aerated lagoon and constructed wetlands can provide an effective alternative to standard techniques for landfill leachate treatment and disposal. The methods as described have proven to be ideal for the circumstances occurring at the Perdido Landfill.

scholarly journals Impact of Okhla, Bhalswa and Ghazipur Municipal Waste Dumpsites (Landfill) on Groundwater Quality in Delhi

2021 ◽  
Vol 16 (1) ◽  
pp. 210-220
Author(s):  
Sonam Angmo ◽  
Shachi Shah
Keyword(s):  
Solid Waste ◽  
Landfill Leachate ◽  
Environmental Concern ◽  
Oxygen Demand ◽  
Waste To Energy ◽  
High Concentration ◽  
Rapid Urbanization ◽  
Aquatic Life ◽  
Waste Segregation ◽  
Treatment Facilities

Rapid urbanization, increasing prosperity, economic development coupled with changing lifestyle has produced a tremendous generation of waste in huge quantity. The dumping of this huge quantity of partially segregated waste has become a public health and environmental concern. According to an estimate, more than 9500 tons per day (TPD) of MSW (Municipal solid waste) is generated in Delhi and about 60% of waste is transported to these three-active landfills in order of maximum in Bhalswa followed by Ghazipur and Okhla landfill sites which are non-scientific landfill and less than 40% were transported to composting plant and waste to energy plant. These waste dump sites have finished their commissioned date and crossed the permissible height and come under matured landfill (old). Dumping of unsegregated waste in these landfills contribute long-term threat to groundwater as various parameter such as inorganic, organic and heavy metal liberate from leachate of unsegregated solid waste and concentration varies with season. Soil contamination, air pollution and various other environmental, health and social impacts in the vicinity of these landfills are found to be connected with uncontrolled dumping of waste. The study reported that, till date in Delhi, there is no single landfill which is controlled and provides with baseliner or proper cover. All three active landfill still received solid waste beyond their capacity without any attention to waste segregation. Impact of landfill leachate on groundwater revealed by presences of high concentration of various parameters like Chloride, Nitrate, Sulphate, Ammonium, Phenol, Iron, Zinc and Chemical oxygen demand in assessed which showed that quality of groundwater is significantly affected by the percolation of landfill leachate. The main problem of the landfill is the generation of toxic leachate and gases which finally end their life in groundwater and environment and ultimately reach to human and damage aquatic life present in water. On the other hand emission of greenhouse gases lead to the risk of fire and also cause global warming. Presently NGT had warned officer of these three landfills of Delhi to remediate landfill. There is an urgent need of leachate collection system and treatment facilities and gas trapping technologies at this landfill for energy generation and to protect the contamination of groundwater.

Treatment performance and microbial characteristics in two-stage membrane bioreactor applied to partially stabilized leachate

2011 ◽  
Vol 64 (5) ◽  
pp. 1064-1072 ◽  
Author(s):  
C. Chiemchaisri ◽  
W. Chiemchaisri ◽  
P. Nindee ◽  
C. Y. Chang ◽  
K. Yamamoto
Keyword(s):  
Membrane Bioreactor ◽  
Hollow Fiber Membrane ◽  
Nitrifying Bacteria ◽  
Hybridization Technique ◽  
Two Stage ◽  
Microbial Characteristics ◽  
Incline Tube ◽  
Bioreactor System ◽  
Solid Liquid ◽  
Solid Liquid Separation

A two-stage membrane bioreactor system was applied to the treatment of partially stabilized leachate from solid waste landfill in Thailand. In the system, an anoxic tank with incline tube for biomass separation from re-circulated sludge is followed by a second-stage aerobic tank in which a direct submerged hollow-fiber membrane module is used for solid–liquid separation. During steady operation of 200 days, BOD, COD, NH3 and TKN removals were found to be 99.6, 68, 89 and 86% respectively. Determination of nitrogen transforming bacteria by fluorescent in-situ hybridization technique revealed a slightly higher percentage of nitrifying bacteria in the aerobic tank and a higher percentage of denitrifying bacteria in the anoxic tank respectively. Anammox-like bacteria were also detected at relatively high percentage.

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