wastewater biofilm Articles
-
Enumeration of sulphate-reducing bacteria for assessing potential for hydrogen sulphide production in urban drainage systems
Urban drainage structures have increasing demands which can lead to increasing hydrogen sulphide related problems forming in places where they have not previously been prevalent. This puts pressure on the methods currently used to monitor and diagnose these problems and more sophisticated methods may be needed for identifying the origin of the problems. Molecular microbiological techniques, ...
-
Kinetics of aerobic oxidation of volatile sulfur compounds in wastewater and biofilm from sewers
Laboratory experiments were conducted to investigate the kinetics of aerobic chemical and biological oxidation of selected odorous volatile sulfur compounds (VSCs) by wastewater and biofilm from sewers. The VSCs included methyl mercaptan (MeSH), ethyl mercaptan (EtSH), dimethyl sulfide (DMS) and total inorganic sulfide, which have all been reported as the main constituents of foul sewer gas. ...
-
Performance of permeable media rotating reactors used for pretreatment of wastewaters
The impact of organic loading rate (OLR) on carbonaceous materials and ammonia removal was assessed in bench scale rotating media biofilm reactors treating real wastewater. Media composition influences biofilm structure and therefore performance. Here, plastic mesh, reticulated coarse foam and fine foam media were operated concurrently at OLRs of 15, 35 and 60 g sCOD m−2d−1 in ...
-
Design of multistage activated sludge-biofilm reactors: a rational approach
This paper outlines a mathematical model developed for steady-state multistage completely mixed hybrid reactors, starting from basic mass balance expressions for the system and Fick's theory for diffusion of substrate into the biofilm. The model being complex, a design procedure has been proposed that uses predefined effluent quality profile across the system and results in an accurate and ...
-
Performance of a fixed-bed biofilm reactor with microbubble aeration in aerobic wastewater treatment
Microbubble aeration is supposed to be highly efficient for oxygen supply in aerobic wastewater treatment. In the present study, the performance of a fixed-bed biofilm reactor microbubble-aerated using a Shirasu porous glass (SPG) membrane system was investigated when treating synthetic municipal wastewater. The biofilm formation on the carriers was enhanced with microbubble aeration due to ...
-
Degradation of organic matter from domestic wastewater with loofah sponge biofilm reactor
A laboratory-scale oxic biofilm reactor using loofah sponge as support material was carried out to study its start-up characteristics and the optimum operation parameters in removing organic matter and nitrogen from domestic wastewater. It took no more than 10 days to complete microbiological cultivation and acclimation, indicating that the natural loofah sponge was a superior support material ...
-
Removal of Zn(II) from simulated wastewater using an algal biofilm
An algal biofilm was employed as a novel kind of adsorbing material to remove Zn(II) from simulated wastewater. The algal biofilm system formed by Oedogonium sp. was operated in a dynamic mode for a period of 14 days with an initial Zn(II) concentration of 10 mg/L. The average effluent Zn(II) concentration was 0.247 mg/L and the average removal efficiency reached 97.7%. The effects of ...
-
Modeling phototrophic biofilms in a plug-flow reactor
The use of phototrophic biofilms in wastewater treatment has been recognized as a potential option for development of new reactor configurations. For better understanding of these systems, a numerical model was developed including relevant microbial processes. As a novelty, this model was implemented in COMSOL Multiphysics, a modern computational environment for complex dynamic models. A ...
-
Partial nitrification of non-ammonium-rich wastewater within biofilm filters under ambient temperature
This study evaluated the partial nitrification performances of two biofilm filters over a synthetic non-ammonium-rich wastewater at a 20°C room temperature under both limited DO (∼2.0 mg/L) and unlimited DO (∼4.0 mg/L) conditions. The two filters were each of 80 cm long and used different biofilm carriers: activated carbon and ceramic granule. Results showed that partial nitrification was ...
-
Effects of nutrient loading on Anabaena flos-aquae biofilm: biofilm growth and nutrient removals
Effects of three different nutrient loadings (low nutrient loading, medium nutrient loading and high nutrient loading, denoted as LNS, MNS and HNS, respectively) on the structure and functions of algal biofilm using Anabaena flos-aquae were investigated using synthetic wastewater. Nutrients removal efficiencies, biofilm thickness, microalgae dehydrogenase activity (DHA) and exopolysaccharide ...
-
Application of biofilm reactors to improve ammonia oxidation in low nitrogen loaded wastewater
An airlift reactor using zeolite particles as carrier material was used for the nitrification of effluents from the aquaculture industry. During the start-up the nitrogen concentration was kept around 100 mg NH4+-N/L to develop the nitrifying population. Later it was decreased down to around 3 mg NH4+-N/L and the dilution rate was increased up to 4.8 d-1 in order to simulate the conditions in a ...
-
Fixed vs. Moving Bed Systems: Aeration and Mixing Efficiency
The aeration design for a biofilm system, such as moving bed or AccuFAS fixed-film systems, is more complex than a standard activated sludge system. In a biofilm system, the aeration design must satisfy the oxygen demand for required treatment, provide mixing, and control biofilm thickness. In an AccuFAS system, diffusers are installed beneath each media tower, forming an airlift pumping ...
-
Fixed biomass process and its resistance to elevated copper loads during carbon removal and nitrification of industrial wastewater
Metal compounds such as copper are known to be inhibitory or toxic to biological activity within wastewater treatments when reaching a certain threshold concentration. Little information on threshold values can be found for biofilm process like Biological Aerated Filters (BAFs). In this study, a BAF pilot plant (Biostyr®) for carbon removal and nitrification was operated to study its response to ...
-
Floating treatment wetlands for domestic wastewater treatment
Floating islands are a form of treatment wetland characterized by a mat of synthetic matrix at the water surface into which macrophytes can be planted and through which water passes. We evaluated two matrix materials for treating domestic wastewater, recycled plastic and recycled carpet fibers, for chemical oxygen demand (COD) and nitrogen removal. These materials were compared to pea gravel or ...
-
Trickling Filter Technology Is Still Relevant
Trickling filters have been the workhorse of the biological wastewater treatment industry for over 100 years. Trickling filters have proven to efficiently remove pollutants from wastewater since their inception, earning recognition as a technology that will continue to serve the industry well into the future. History Prior to the use of structured sheet media, rock was used in trickling filters ...
-
Calibration and verification of models of organic carbon removal kinetics in Aerated Submerged Fixed-Bed Biofilm Reactors (ASFBBR): a case study of wastewater from an oil-refinery
The article presents a case-study on the calibration and verification of mathematical models of organic carbon removal kinetics in biofilm. The chosen Harremöes and Wanner & Reichert models were calibrated with a set of model parameters obtained both during dedicated studies conducted at pilot- and lab-scales for petrochemical wastewater conditions and from the literature. Next, the models were ...
-
WWTP with MABR Technology in Rural Israel - Case Study
PROJECT DETAILS LOCATION HaYogev rural residential development in Israel CUSTOMER Moshav HaYogev SOLUTION Wastewater Treatment Plant TECHNOLOGIES Membrane aerated biofilm reactor (MABR) wastewater treatment Revolutionary MABR product solution implemented at wastewater treatment plant in rural Israel Background HaYogev is a residential development in the rural area of Jezreel Valley, ...
-
Performance of an ultra-compact biofilm reactor treating domestic and synthetic wastewaters
The performance of an ultra-compact biofilm reactor (UCBR) treating domestic wastewater (DWW) collected from a local water reclamation plant; and gradually shifting to a mono-type carbon source synthetic wastewater (SWW) combined with DDW (CWW) and finally SWW; was investigated in this study. The total COD concentrations of influent DWW and CWW/SWW were 413.6 ± 80.8 mg/L and 454.9 ± 51.3 mg/L, ...
-
Development and application of some renovated technologies for municipal wastewater treatment in China
China has been experiencing fast economic development in recent decades at the cost of serious environmental deterioration. Wastewater discharge, especially municipal wastewater discharge, and non-point pollution sources are becoming the major water pollution source and research focus. Great efforts have been made on water pollution control and a number of renovated technologies and processes for ...
-
5 Top advantages of MBBR wastewater treatment
Wastewater treatment solutions have become one of the significant moves to filter waste water. Whether it is for fighting with the growing shortage of drinking water or finding better water sources for wastewater, several technologies have been practice for centuries, and MBBR wastewater treatment is being used for filtering waste water in both industrial and domestic sectors. MBBR or Moving Bed ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you