Model of Liquid Waste Treatment Unit of Tofu by Using Water Plants (Pistia Strafiates) and Biofilter

Liquid waste in tofu industry has high content of organic compound, thus, it is needed to be treated firstly before it was disposed to the environment. Level of pollutants of liquid waste pollutant from tofu production can be decreased through biological system treatment by using water plants which are modified by biofiltration through using sand, gravel, and coral so that the quality of waste that was disposed to the water outside was in accordance with the applicable regulation. Moreover, this research aimed at analyzing the ability of water plants (Pistia strafiates) for reducing the parameter of BOD, COD, and TSS in tofu waste. The research that was used was experimental research. Sample collection was conducted once in 2 hours in outlet of waste treatment until obtaining effluent result that qualified the effluent quality standard that was expected. Data analysis was conducted by using comparative test for examining the difference of data for more than two groups. The obtained result from this research was it was occurred a significant decrease for either parameter of BOD, COD, or TSS by using reactor that was planted water plants.