11
Facilities and installations, mobile or fixed, for the chemical, biological, physical or physico-chemical (or lysis) breaking down of bacteria occuring in the biological treatment of urban or industrial wastewater and making up liquid and semi-liquid sludge derived from sewage plants; installations and apparatus, mobile or fixed, for the preparation, mixing, dosage and distribution of oxidizing chemical products, surface-active or enzyme products, designed for breaking down cell walls; water treatment and settling apparatus and installations, consisting of equipment used for reducing the production of biological sludge by methods involving chemical oxidizing reagents, surface-active agents, enzymes, radiation, electric fields, electron beams, mechanical comminution and shredding means or biological means of enzymatic hydrolysis or digestion, as well as a combination of two or several of these methods
40
Water and waste treatment of slurry from sewage plants; water and waste treatment in the nature of adjustment of physical and physio-chemical parameters for sludge from sewage plants by biological aerobic or anaerobic fermentation, dewatering, single and multistage digestion; water and waste treatment in the nature of transforming sludge from sewage plants with production of replacement fuels, compost, fertilizer, or growing media
42
Technical research and consultation in the field of treating urban or industrial wastewater, in the field of techniques for reducing the production of sludge from installations for purifying municipal and industrial wastewater; technical audits, expert witness services and consultancy in connection with processes for treating urban wastewater and sludge treatment before spreading, sludge re-use, drying or incineration
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