Articles CIWEM NH4 Process buoy

Abstract:

On line control of nutrient removal in biological processes, and addition of Phosphorous and Nitrogen to nutrient deficient biosystems, up to now, have not found widespread application. The reasons for this were lack of reliable “In situ” instrumentation together with process variants and physical structures which did not lend themselves easily to dynamic control. The advent of batch and semi batch biological processes, together with recent instrument advances, has potentially changed this. These changes have now enabled an Ammonia measurement system to be installed and tested within a digester liquor treatment plant, operating in a semi draw and fill mode. This paper gives details of both Ammonia-N and orthophosphate in situ measurement devices, and describes the practical implementation of such devices on real plants. Effects on effluent quality control and treatment costs are considered.