Treatment, transformation and purification of organic substances, namely, phosphate recovery from sewage sludge and sewage sludge ashes for production of organo phosphorous compounds targeting various market such as flame retardants, fertilizers or feed; treatment, transformation and purification of organophosphorus compounds, namely, conversion of sewage sludge and ashes into merchant grade phosphates such as fertilizers, feed or technical grade phosphates; treatment, transformation and puri...