The invention provides treatments of organic waste. The invention provides a method for treating organic waste (and in particular, animal waste such as waste from a cow), and uses of a composition that is capable of generating a reactive species in methods of reducing biological degradation of organic waste, in the treatment of organic waste. The invention also provides organic waste treated by the methods of the invention and uses of this treated organic waste. The invention also provides a method for improving the production of volatile fatty acids (VFA) and medium-chain carboxylic acids (MCCAs) during anaerobic digestion (AD) of organic waste.