Sulphide build-up in pressure sewers has been identified as the main cause for occurrence of odour and corrosion sewer systems. Despite efforts to optimize commonly used control technologies such nitrate iron salts reduce sulphide emission, continuous addition these chemicals is still required. A biocidal agent free nitrous acid can be added intermittently, less frequently, smaller quantities w...

The equilibrium lies well over on the side of free phosphate. Studies of the histochemical localization of alkaline phosphatase were made by Robison (1923), who showed that if a section of bone is incubated in a solution containing a phosphoric acid ester and calcium, the phosphate which is split off from the ester by phosphatase is precipitated as calcium phosphate in the vicinity of the enzym...