Batik wastewater contains Cr (VI) heavy metal which is harmful to the environment. Cr (VI) in batik wastewater can be removed by biosorption. Biosorption capacity, however, depends on the biosorbent type and surface area. An abundant, inexpensive, and readily available biosorbent are straw and baglog waste. Modified tea bag can increase biosorbent surface area. This research aimed to obtain the optimum biosorbent ratio and pH in Cr (VI) adsorption capacity. These experiments were conducted using Spilt Plot Design. The data were analyzed with F-test at a significant level of 5%. The results showed that the highest of Cr adsorbed was 0.0047 mg/g with an efficiency decrease of 84.23%  in the biosorbent ratio of 3:1 and pH 5. Modified tea bag biosorbent was effective to remove Cr in batik wastewater.

Sri Lestari

Ratna Stia Dewi

Eko Setio Wibowo

Atang