PEMANFAATAN KOMPOSIT NATURAL BENTONITE DAN AMPAS TEBU SEBAGAI PENJERNIH AIR LIMBAH INDUSTRI TAHU HARAPAN MAJU

Tofu industry is an industry dominated by small-scale businesses with limited capital. In terms of location, this business is also very spread throughout Indonesia. One of them is the Harapan Maju (HS) tofu industry in Cimanggis, Depok, West Java. This industry still uses the traditional method by disposing of waste into water bodies. Tofu liquid waste has the characteristics of containing high organic matter and the levels of BOD, COD, TDS are quite high, and and the pH value is low so that if it is directly discharged into the river it can pollute the environment. Therefore, bentonite and bagasse activated carbon are used to treat the waste water of the Harapan Maju tofu industry so that it is safe to be discharged into water bodies. Bentonite has a good ability to absorb organic matter and binds relatively small solids in water. Meanwhile, bagasse activated carbon functions as a purifier and absorbs heavy metals in wastewater. The process carried out is the absorption process or the process of separating solids from the fluid by passing the fluid through a filter medium or septum, where solids will be left in the medium. With this simple technology, it will be very effective when applied to the tofu industrial wastewater treatment, so that the waste that is disposed of will not disturb the ecosystem of water bodies. Before testing the BOD value was 714 ppm, TDS 1129 ppm, COD 1152 ppm and the pH of the wastewater was 4 . After testing, the BOD values were 142.8 ppm, TDS 407 ppm, COD 195.84 ppm and pH 6.