Abstract:
The existence of wastewater from the tofu processed waste water without processed first leads to a decrease in water quality. The objectives of the study were to analyze the combination of variation of EM-4 dose and fermentation time and combination of variation of EM-4 dose and fermentation time on physical parameters (TSS), chemical (BOD, COD, pH). The research design was using Completely Randomized Design. Types of experimental research with effluent treatment using Effective Microorganism-4 (EM4) activator with 5%, 7%, 10% and 5 days, 10 days, 15 days, repetition times. The results showed the largest decrease of waste concentration in processing of EM4 concentration 10% with a residence time of 20 days with TSS 2,938.33mg / L (85,5%), BOD 574,58mg / L (71,9%), COD 2,012, 8mg / L (71.8%) and pH 7.5 (87%). Data analysis using anova in treatment group of EM4 concentration and fermentation time was obtained p = 0,000 and α = 0,05 indicated that there was significant difference due to variation of EM4 concentration, due to combination of variation of dose em-4 and fermentation time and interaction of both. The parameters of TSS, BOD and COD have not met the standard of quality standard, and pH parameters have fulfilled the standard of quality with the index of light contamination at best treatment that is 10% dose of EM4 dose and 20 days fermentation time
