Biological Oxygen Demand Articles on Environmental XPRT

What are the differences between Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD)?

Ask the expert: What are the differences between Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD)? Answer: Both COD and BOD test methods aim to give an indication of the amount of pollution in a water sample. COD is the amount of oxygen required to chemically breakdown the pollutants whereas BOD is the amount of oxygen ...

Jun. 19, 2015

By Camlab Limited

Oxygen Transfer in a Biological Aerated Filter

The City of San Diego (City) operates the Point Loma Wastewater Treatment Plant (PLWTP) which can normally treat up to 240 million gallons per day (MGD) of chemically enhanced primary treated (CEPT) effluent for ocean disposal. The City wanted to understand the performance capabilities of Biological Aerated Filters (BAFs) in treating CEPT effluent to secondary standards. To this end, the City ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Efficient reduction of chemical oxygen demand in industrial wastewaters

Depending on the industry activity and the situation, maximum chemical oxygen demand (COD) levels between 200 and 1000 mgO2/l (ppmO2) must be reached in order to release the wastewaters back into the environment [1]. Wastewater treat-ment technologies, such as filtration, biological digestion, or incineration exist but these technologies are either expensive or generate sludges which must be ...

Jan. 1, 2002

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 ...

Nov. 13, 2013

By IWA Publishing

Why is Chemical Oxygen Demand (COD) a useful parameter for drinking water analysis?

Ask the Expert: COD Analysis for Drinking Water Question: Why is Chemical Oxygen Demand (COD) a useful parameter for drinking water analysis? Answer: At very basic level Chemical Oxygen ...

May 8, 2015

By Camlab Limited

Biological Wastewater Treatment

Untitled Document The use of microorganisms to remove contaminants from wastewater is effective and widespread. To choose the right system from the many options offered, ...

Oct. 1, 2005

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 ...

Jan. 1, 2005

By IC Controls Ltd.

Mechanical biological treatment trends

Composting mixed municipal solid waste has a long tradition in Germany. In 1953, the first large-scale facilities in Baden-Baden and Blaubeuren started operating, followed later by plants in Heidelberg, Duisburg and other locations across the western part of Germany. Facilities were being opened to provide alternatives to landfilling MSW, and to produce compost for agricultural use. The quality ...

Oct. 1, 2008

By BioCycle Magazine

Biological phosphorus and nitrogen removal in sequencing batch reactors: effects of cycle length, dissolved oxygen concentration and influent particulate matter

Removal of phosphorus (P) and nitrogen (N) from municipal wastewaters is required to mitigate eutrophication of receiving water bodies. While most treatment plants achieve good N removal using influent carbon (C), the use of influent C to facilitate enhanced biological phosphorus removal (EBPR) is poorly explored. A number of operational parameters can facilitate optimum use of influent C and ...

Sep. 16, 2013

By IWA Publishing

Biological treatment of pharmaceutical wastewater from the antibiotics industry

Pharmaceutical wastewater generated by an antibiotics (penicillin) company was treated by aerobic membrane bioreactors (MBRs) and sequencing batch reactors (SBRs). At a low organic loading rate of 0.22 kg-COD m−3d−1, both types of reactors were capable of treating the wastewater such that the treated effluent met the discharge regulation except for the total dissolved ...

Feb. 26, 2014

By IWA Publishing

Treatment of laundry wastewater by biological and electrocoagulation methods

The present study describes an improvement in the current electrocoagulation treatment process and focuses on a comparative study for the clean-up of laundry wastewater (LWW) after each wash and rinse cycle by biological and electrocoagulation treatment methods. For biological treatment, the wastewater was treated with a Bacillus strain of aerobic bacteria especially suited for the ...

Oct. 20, 2016

By IWA Publishing

Vermifilters: a tool for aerobic biological treatment of herbal pharmaceutical wastewater

Herbal pharmaceutical wastewater possesses high chemical oxygen demand (COD) (21,960–26,000 mg/l) and biochemical oxygen demand (BOD) (11,200–15,660 mg/l) and suspended solids (SS) (5,460–7,370 mg/l). It cannot be directly discharged into surface water bodies, due to its highly biodegradable nature. Herbal pharmaceutical wastewater has been treated by using vermifilter, which is an ecosystem ...

May 1, 2010

By IWA Publishing

Nutrient removal in reverse osmosis concentrates using a biological aerated filter

The aim of this study is to employ a biological aerated filter (BAF) in the treatment of reverse osmosis (RO) concentrate received from reuse of treatment plant wastewater. Furthermore, the influence of chemical oxygen demand (COD)/N ratio on the nutrient removal was analyzed to find the detailed removal pathways of nutrients. The result was found to be high efficiency for biochemical oxygen ...

Apr. 8, 2015

By IWA Publishing

Enhanced physicochemical-biological sewage treatment process in cold regions

Biological treatment processes give relatively poor pollutant removal efficiencies in cold regions because microbial activity is inhibited at low temperatures. We developed an enhanced physicochemical-biological wastewater treatment process that involves micro-membrane filtration, anaerobic biofilter, and aerobic biofilter to improve the pollutant removal efficiencies that can be achieved under ...

Nov. 18, 2014

By IWA Publishing

Improving biological phosphorus removal in membrane bioreactors – a pilot study

With increasing water reuse applications and possible stringent regulations of phosphorus content in secondary and tertiary effluent discharge in Florida, USA, alternative technologies beyond conventional treatment processes require implementation to achieve low phosphorus (P) and nitrogen (N) concentrations. A pilot scale membrane bioreactor (MBR) system, operated in Florida, adopted the ...

Mar. 11, 2014

By IWA Publishing

Investigation of furfural biodegradation in a continuous inflow cyclic biological reactor

The performance of a continuous inflow cyclic biological reactor (CBR) containing moving media was investigated for the degradation of high concentrations of furfural. The effects of hydraulic retention time (HRT) and furfural initial concentrations (loading rate), as main operating parameters, on the bioreactor performance were studied. The results indicated that the CBR could remove over 98% ...

Sep. 22, 2015

By IWA Publishing

Degradation of atrazine by microbial consortium in an anaerobic submerged biological filter

Atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) (ATZ) is one of the components of S-triazine. Due to its certain characteristics, ATZ causes pollution in various ecosystems and has been of concern for its probable carcinogenic effects on humans. Researchers have used chemical and physical methods for removing ATZ from the environment. Although these methods are quick, they have ...

Sep. 25, 2014

By IWA Publishing

Treatment of petrochemical secondary effluent by an up-flow biological aerated filter (BAF)

In this study, petrochemical secondary effluent was treated by a 55 cm diameter pilot-scale biological aerated filter (BAF) with a media depth of 220 cm. Volcanic rock grains were filled as the BAF media. Median removal efficiency of chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) was 29.35 and 57.98%, respectively. Moreover, the removal profile of the COD, NH3-N, total ...

Jan. 28, 2016

By IWA Publishing

Biologically and Chemically Enhanced Clarification for Improved Treatment of Wet-Weather Flows

The Milwaukee Metropolitan Sewerage District (MMSD) conducted demonstration testing in 2005 to evaluate high-rate chemically enhanced clarification (CEC) followed by ultraviolet (UV) disinfection, for the treatment of wet-weather flows at MMSD’s two wastewater treatment plants (WWTPs). High-rate CEC—surface overflow rates greater than 20 gallons per minute (gpm) per square foot (ft2) [85 cubic ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Novel application of bamboo-based fibers in a biological contact oxidation process

Generally, biofilm-supporting carriers in biological contact oxidation processes are made from thermoplastic polymers, which cause potential ecological damage because of the low biodegradation and high accumulation in organisms. Thus, four bamboo-based fibers, bamboo primitive fiber, bamboo fiber, bamboo charcoal fiber (BBF) and bamboo charcoal–cotton blending fiber (BCBF), were used as ...

Apr. 10, 2014

By IWA Publishing

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