A simplified fixed biofilm model was developed to formulate the relationship between the substrate concentrations at both the entry and exit, at the biofilm–liquid interface and at the biofilm attached surface along with average substrate flux in the biofilm, substrate flux at the biofilm–liquid interface and effective biofilm thickness. The model considered the substrate mass transport external to the biofilm and into the biofilm as per Fick's law and the steady state substrate as well as biomass balance for attached growth microorganisms. Monod's growth kinetics has been adopted in substrate utilization, incorporating relevant boundary conditions. The numerical solution of model equations was accomplished for calculating average flux and exit substrate concentration and thereafter the Runge–Kutta method was employed for determining effective biofilm thickness. Consequently, two computer programs were developed for the purpose of rapid solution. The model was satisfactorily applied to data available from the literature for checking its accuracy and was validated with the experimental results. The model was found to be an easy, accurate and fast method that can be used for process design of a fixed biofilm reactor.
Stable and reliable ANAMMOX process provided by Mutag BioChip™ biofilm technology
Since the demand for the so-called “ANAMMOX process” (ANaerobic AMMonium OXidation) is steadily growing within the sector of biological treatment of wastewater and sewage, a new and effective solution for maintaining the process stability is urgently required. A suchlike solution can be realized by means of a special biofilm carrier-based technology. Having an optimized pore structure at a nominal diameter of 25 mm, the Mutag BioChip 25™ (MBBR carrier developed by the German-based company...
EPA Proposes Two Test Methods and Guidance for Evaluating Antimicrobial Pesticides
The U.S. Environmental Protection Agency (EPA) has recently announced the availability of two proposed test methods and associated testing guidance for evaluating antimicrobial pesticides against two biofilm bacteria, Pseudomonas aeruginosa and Staphylococcus aureus, for comments. EPA states that registrants of antimicrobial products with public health claims are “required to submit efficacy data to EPA in support of the product’s registration” under the Federal Insecticide, Fungicide, and...
Neuthox removes legionella bacteria and biofilm - Case Study
Hotel Terme della Sardegna (Sardinia, Italy) saves 12.000 € yearly by having a clean water systemDanish Clean Water is the manufacturer of an ECA generator, which produces the disinfectant liquid, NEUTHOX.NEUTHOX is produced through an electrolysis process, where only electrical power, common salt and water is used, and is a clear 100 % biodegradable liquid which eliminates dangerous bacteria, such as Legionella and Salmonella, in water.The DCW generator is fully automatic and adds NEUTHOX to the water...
A Practical Solution for Real Time Organic Monitoring
Monitoring organics continuously provides instantaneous water quality data that is vital for several of the most common water and wastewater treatment applications. Online organic water quality testing ensures that immediate action can be taken to establish proper treatment. real-time organic monitoring is invaluable for optimizing and controlling coagulant dosing; monitoring performance and condition of activated carbon filters; determining uV dose; indicating potential formation of disinfection byproducts...
Biofilm carriers / MBBR carrier media and their respective diffusion depth
Within the biological wastewater treatment sector, it can increasingly be observed that biofilm carriers are applied in so-called Moving Bed Biofilm Reactors (MBBR). Thereby, the MBBR process is not only used to great success for the purification of domestic sewage but also in the sector of industrial wastewater and aquaculture systems. The availability of high-performance biofilm carriers, which have been developed during the recent years, is certainly one of the reasons for the increase in the application of...