Wastewater and sewage sludge in different proportions plus equal amounts of molasses and effective microorganisms (EM) were used to prepare 12 types of fertilizer (Table 1) The EM used in this were produced by bon. The fertilizer production conditions were adapted from and Jitiumroonchokchai (2009)
The following physicochemical characteristics were determined according to the procedures by Peverill et al (1999): temperature, pH, electrical conductivity, total nitrogen, total phosphorus, total potassium, C/N ratio, calcium (Ca), magnesium (Mg), copper (Cu), ferrous (Fe), and zinc (Zn), Liquid organic fertilizer samples were analyzed every five days until liquid organic fertilizer fermentation was complete. The composting process depen ded on physicochemical parameters and the frequency and degree of turning it over (Punsak, Pampasit 2001)