November 14-17th 2012
Aqua-tools will be present at MEDICA exhibition in Düsseldorf from 14th to 17th November 2012. Meet us on stand number 7AE 26I at UBI France department. We are looking for distributors in various countries for our terminal filtration activity !
Study “Prevention of water-related risks in healthcare establishments in la Reunion”
Read the article
L’EAU, L’INDUSTRIE, LES NUISANCES – n°346 « Monitoring the biological quality of drinking water in the distribution networks – Studies of 4 municipalities in Poland » Read the article.
HYGIENES 2011 – Volume XIX – n°6
« Prevention of risks from water in healthcare settings in La Réunion » J.-C.Denys Read the article.
Composting is a process of biological aerobic decomposition of organic waste by microorganisms. This transformation of organic matter (wastewater treatment sludge, brushwood, household waste) produces a soils enrichment product rich in humic acids called compost.
If composting is a natural process, spontaneously taking place in environment, it must be optimised in order to industrially produce compost.
In order to produce compost from organic matter, oxygen, humidity, and a nitrogen/carbon ratio adapted to microbial growth are needed. When all these parameters are properly settled, the aerated and moist organic matter (adapted porosity, wastes reversal, aeration systems) is decomposed by the aerobic microorganisms until compost has been produced. Two consecutive steps take place during this process:
As long as compost is not mature, it is toxic for plants and can not be used as soils enrichment. It is, then, of first necessity, to know about the compost maturity. In order to determine whether compost is ready or not, several techniques, more or less time consuming and complex, exist:
Most of all, none of these tests consider the biology of compost as composting is a biological process using microorganisms. Quantitative ATP-metry QG21W™ kit is the only test enabling easy and fast (5 minutes) measurement of all the living microorganisms and of their stress (mortality) during the composting process.
Adenosine Triphosphate (ATP) is the energy carrier in any biological cell. In particular, ATP is present in all living microorganisms. The QG21W kit, based on quantitative ATP-metry, uses a reaction of bioluminescence to quantify ATP.
This kit enables to measure intra-cellular ATP (cATP™) corresponding to the ATP within living microorganisms and which is a direct indication of active biomass concentration in compost. Intra-cellular ATP is calculated as the difference of total ATP (tATP™) and dissolved ATP (dATP™): cATP = tATP - dATP.
Moreover, QG21W also enables to calculate the Biomass Stress Index – BSI™ – representing biomass health and mortality. The BSI is defined as the ratio of dATP to tATP: BSI (%) = dATP/tATP.
Use of QG21W kit for compost monitoring
Using QG21W kit, monitoring and controlling directly biological activity of microorganisms responsible of compost production is now possible. Studies show that active biomass monitoring via ATP-metry enables to measure evolution of microorganisms concentration within the compost in order to optimize composting process. Using QG21W kit, quantitative measure of ATP gives a direct indication of microorganisms’ health and activity in the composting process. ATP measure is indicative of composting process and can be used for compost monitoring.
Measures carried out by Aqua-tools clearly show a cATP decrease progressively as the compost matures. A mature compost is characterized by a higher BSI. These results are similar to others studies on this subject.
Consequently, using QG21W kit, follow-up of intra-cellular ATP and BSI is a simple, quick and direct way to control composting process and to evaluate compost maturity.
So, measures carried out with QG21W kit enable to follow active biomass activity into compost in order to make sure:
QG21W kit also enables to control compost maturity by observing: