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...
The application of moving bed biofilm reactor to denitrification process after trickling filters
The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic carbon concentration on the denitrification rate and efficiency of total nitrogen removal was also examined. The study showed...
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...
Toxicity and biofilm-based selection for methyl tert-butyl ether bioremediation technology
Extractive membrane biofilm reactor (EMBFR) technology offers productive solutions for volatile and semi-volatile compound removal from water bodies. In this study, the bacterial strains Paenibacillus etheri SH7T (CECT 8558), Agrobacterium sp. MS2 (CECT 8557) and Rhodococcus ruber strains A5 (CECT 8556), EE6 (CECT 8612) and EE1 (CECT 8555), previously isolated from fuel-contaminated sites, were tested for adherence on tubular semipermeable membranes in laboratory-scale systems designed for methyl tert-butyl ether...