Research School for Socio-Economic and
Natural Sciences of the Environment
Research School for Socio-Economic and
Natural Sciences of the Environment

Nadejda Andreev

Date: 24 March 2017
Time: 16:00 - 17:30
Location: TU Delft, Auditorium


Dissertation title: 

Lacto-fermentation of human excreta for agricultural application

Group: UNESCO-IHE, Pollution Prevention and Control
Promotor: Professor Piet Lens


The research focuses on lactic acid fermentation for resource oriented treatment of human excreta. The efficiency of combined lacto-fermentation with thermophilic composting versus lacto-fermentation with vermicomposting on pathogen removal and the post-effects on seed germination (radish) and plant growth (tomatoes) were examined in a pot experiment. Moreover, main effects of lacto-fermented faeces and biowaste supplemented by biochar on soil quality of a clay-loamy cernoziom of Moldova as well as on growth and yield of corn, Zea mays L were examined in a two year field experiment. Lacto-fermented faeces supplemented by biochar has improved soil bulk density, nitrate and potassium concentrations as well as the yield and yield components of corn. Combined lacto-fermentation with thermophilic composting and biochar supplementation had better pathogen reduction and higher plant effects than combined lacto-fermentation with vermicomposting. Urine lacto-fermentation contributed to pH reduction below 4, a decrease in the ammonium concentration and odor strength, as well as an increase in the germination rates compared to untreated stored urine.