biological oxygen demand Articles
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Activated sludge and chemical treatment process for Chemi-Thermo-Mechanical Pulping black liquors
Characterisation and treatment of the black liquor coming from Chemi-thermo-mechanical pulping (CTMP) of wheat straw was evaluated in this research. Toxicity of the liquor was evaluated and it was found high in Biological Oxygen Demand (BOD) 0.45%, Chemical Oxygen Demand (COD) 1.85%, dissolved solids 1.04%, suspended solids 0.33%, total sulphur contents 2.42% and silica contents 0.45%. Activated ...
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Polyhydroxyalkanoates (PHA) biosynthesis from kraft mill wastewaters: biomass origin and C:N relationship influence
The goal of this study is to evaluate the feasibility of PHA biosynthesis from kraft mill effluent using the batch system evaluating the biomass origin and C:N relationship influence. To evaluate feasibility, batch assays were carried out. Also, two levels of the BOD5:N:P relationship (100:5:1 and 100:1:0.2) and three different sludge origins were considered. Inocula were obtained from activated ...
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Factors affecting the performance of a single-chamber microbial fuel cell-type biological oxygen demand sensor
Microbial fuel cells (MFCs) are devices that exploit microorganisms as biocatalysts to degrade organic matter or sludge present in wastewater (WW), and thereby generate electricity. We developed a simple, low-cost single-chamber microbial fuel cell (SCMFC)-type biochemical oxygen demand (BOD) sensor using carbon felt (anode) and activated sludge, and demonstrated its feasibility in the ...
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Efficient nitrogen removal for wastewater in compartmentalised activated sludge process
Studies were conducted on two aerobic-anaerobic configurations of the activated sludge process for nitrogen removal from domestic wastewater. An initial anaerobic stage followed by aerobic, anaerobic and aerobic stages provided best total Kjeldahl nitrogen removal. This profile was selected for conducting further experiments on the effect on nitrogen removal of the hydraulic loading and the food ...
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A pilot-scale study on PVA gel beads based integrated fixed film activated sludge (IFAS) plant for municipal wastewater treatment
In the present study, a pilot-scale reactor incorporating polyvinyl alcohol gel beads as biomass carrier and operating in biological activated sludge mode (a combination of moving bed biofilm reactor (MBBR) and activated sludge) was investigated for the treatment of actual municipal wastewater. The results, during a monitoring period of 4 months, showed effective removal of chemical oxygen ...
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Factors affecting population of filamentous bacteria in wastewater treatment plants with nutrients removal
Filamentous population in activated sludge and key operational parameters of full-scale municipal wastewater treatment plants (WWTPs) with bulking problems representative for Poland were investigated with quantitative fluorescence in situ hybridization. Statistical analyses revealed few relationships between operational parameters and biovolume of filamentous bacteria. Sludge age was not only ...
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Environmental performance of an integrated fixed-film activated sludge (IFAS) reactor treating actual municipal wastewater during start-up phase
The present study summarizes the start-up performance and lessons learned during the start-up and optimization of a pilot-scale plant employing integrated fixed film activated sludge (IFAS) process treating actual municipal wastewater. A comprehensive start-up was tailored and implemented to cater for all the challenges and problems associated with start-up. After attaining desired suspended ...
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ppm Dissolved oxygen measurement
Dissolved oxygen (D.O.) levels are used as a general indicator of water quality. Oxygen is essential to life and vital for countless aquatic forms. D.O. level control is critical in numerous applications ranging from the monitoring of industrial waste water to environmental surveillance. What is Dissolved Oxygen? Dissolved oxygen (D.O.) is the amount of oxygen gas dissolved in a given quantity ...
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BM Respirometry benefits for activated sludge process management, research and training
A biological process controlled by non-biological measurements? All treatment plant efficiencies are geared to the waste that they receive. The microorganisms found in the waste need food and oxygen to survive, the food is provided as soluble organic carbon in the waste stream and the oxygen is obtained through the aeration process in the treatment plant. Once a treatment plant has been built, ...
By SURCIS, S.L.
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General Oxygen Requirements for Wastewater Treatment
TECHNICAL BULLETIN 135 General Oxygen Requirements for Wastewater Treatment Oxygen requirements for municipal wastewater treatment can be predicted closely with the standard laboratory analysis using g the BOD test (special requirements exist for some industrial wastewater). The BOD test is designed to measure Biological Oxygen Demand for the wastewater and provides an excellent basis for ...
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Linking sanitation and wastewater treatment: From evaluation on the basis of effluent pollutant concentrations to evaluation on the basis of pollutant removal efficiencies
In both developed and developing countries, centralised and on-site wastewater treatment systems have been developed for a long time. The main function of the wastewater treatment plants (WWTPs) should be removal of pollutants including organic carbon, nitrogen and phosphorus. Technologies applied to WWTPs are mostly with biological functions such as activated sludge, stabilization reservoir, ...
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The Potential of Water Reuse in Agriculture
Treating wastewater for reuse can turn it into a valuable asset Farming uses a huge amount of water — 70% of fresh water worldwide is used in agriculture, and groundwater in subterranean aquifers is being depleted far faster than natural processes can replenish it. The situation on the surface is no better. In an age of frequent droughts and growing populations, surface water is ...
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Primary Treatment Methods for Suspended Solids in Wastewater
Primary treatment methods for suspended solids in wastewater can seem like a daunting task. Indeed, when it comes to managing and treating wastewater, one of the biggest hurdle often is… The primary treatment of suspended solids in wastewater. This is what separates an average water management system from a sustainable one. However, if you don’t know how to effectively remove ...
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Waste activated sludge reduction using sonication and cryptic growth
The management of excess activated sludge imposes great cost on wastewater treatment plants and represents significant technical challenges. This paper investigates a new technology, sonication and cryptic growth, to reduce the amount of excess sludge from the wastewater treatment system. Subsequent Biological Reactors (SBRs) were used for the study. The results show that the amount of excess ...
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Modeling hydrolysis of slowly biodegradable organic compounds in biological nutrient removal activated sludge systems
Hydrolysis is an important process in biological wastewater treatment and is known to be the rate-limiting step in organic carbon removal from municipal or industrial wastewater. The influence of the readily biodegradable chemical oxygen demand fraction in biological wastewater treatment systems has been extensively investigated, but little is known about the effects of slowly biodegradable ...
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Winery Wastewater Treatment Summaries
Successfully Treating Winery Wastewater Save $135k Treating Winery Wastewater Many smaller wineries have outgrown their septic tanks, and larger wineries have outgrown their treatment ponds, a BioReactor gives increased capacity at a fraction of the cost of conventional pond treatment systems. Wineries traditionally treat their wine process wastewater with aerobic (aerated) ponds to ...
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Methane emission estimates using chamber and tracer release experiments for a municipal waste water treatment plant
This study presents two methods for estimating methane emissions from a waste water treatment plant (WWTP) along with results from a measurement campaign at a WWTP in Valence, France. These methods, chamber measurements and tracer release, rely on Fourier transform infrared spectroscopy and cavity ring-down spectroscopy instruments. We show that the tracer release method is suitable for ...
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