On-site urine treatment combining Ca(OH)2 dissolution and dehydration with ambient air.

ABSTRACT: We present the results of three field tests and three laboratory tests of a new physical-chemical urine treatment system, which can recover all nutrients, while pathogens are inactivated. The system consists of two steps. In the first reactor, biological processes including urea hydrolysis are prevented by mixing fresh urine with calcium hydroxide (Ca(OH)2). Due to the high pH value and the high availability of calcium, phosphate can be recovered by precipitation. The high pH value also fosters the inactivation of microorganisms, including pathogens. In the second reactor, water is evaporated at low energy consumption by blowing unheated ambient air over the stabilized urine. Stabilization in the first reactor was successful in all field and laboratory tests. The pH value remained between

SUBMITTER: Riechmann ME 

PROVIDER: S-EPMC8645517 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature