The first project meeting was organized in University of Porto, Porto, Portugal in 8th of October 2015. Overall project objectives, progress of the project were discussed. The presentation from leading institution UPORTO is available HERE.
The project meeting called INNO Days was organized in Rome, Italy in 15-16th October 2015. Presentation from the meeting is available HERE.
Partnership agreement details, organizational questions and experimental setups were discussed.
RTU team performed an experiment in order to evaluate if phosphorus (and not carbon) is a limiting element of microbial growth. Experiments were performed in Baltezers groundwater treatment plant. A concentration of microbially assimilated phosphorus in water was decreased using three different techniques: biomass, adsorption on a sorbent and electrocoagulation in a model reactors (see image).
The second meeting of project partners was organized in RTU, Riga. CSMCRI presented water quality results from three study sites. Series of experiments were done in order to evaluate an effect of chlorination on bacteria in tested waters. It was found that some bacteria are chlorine resistant and these bacteria are responsible for membrane fouling.
CSIR-IICT also presented water quality results from study sites. The main problems are: fluoride, iron, nitrate, heavy metals.
RTU showed results from water pre-treatment experiments in order to limit phosphorus in water. Some additional tests should be done, but Indian partners showed interest in biofiltration technology.
TUBS reported on experiments with chemical pre-treatment methods. Tested coagulants were Al2(SO4)3, FeCl3, FeSO4. Use of FeSO4 resulted in poor sedimentation characteristics.
UPORTO showed results from experiments with biocides coatings immobilized on particles (as pre-treatment technology). Tested cores were: Zeolite powder, Zeolite B granular particles, Zeolite BF granular particles, Activated Charcoal, Cork, Sodium Alginate.
For investigating membrane fouling and coagulation effectiveness TU BS team developed a model raw water containing sodium chloride, humic acid sodium salt and Arizona dust. Coagulation experiments with aluminum sulfate, iron chloride and iron sulfate were carried out. Measurements of pH, electrical conductivity, spectral attenuation coefficient at 436nm and TOC content of raw water and pre-treated water (after coagulation and sedimentation) are used to evaluate the effectiveness of the pre-treatment. Aluminum sulfate and iron chloride showed very good results, but iron sulfate forms smaller flakes, therefor sedimentation is much slower.
In CSIR-CSMCRI (India) effect of chlorination on bacterial growth, on their physiological changes and on their potential to get attached to the membrane surface was studied. Nine chlorine resistant bacterial strains were isolated in local water body. These were identified primarily by biolog test and finally by 16s RNA sequencing. The bacterial strains were found to be live even after 30 minutes chlorine treatment following methods suggested by commercial membrane manufacturer [see image].