Batik is one of the Indonesian cultures which is included in the clothing product. Batik in its production process produces several turbid liquid wastes containing synthetic materials that are difficult to dissolve and decompose.
The liquid waste contains organic compounds that are harmful to the environment if not treated first. These compounds include BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), and TSS (Total Suspended Solid).
Minister of Environment Regulation No. 5 of 2014, the quality standards for BOD, COD, and TSS of textile industry wastewater are 60, 150, and 60 mg/L, respectively.
The levels of BOD, COD, and TSS are indicators of water quality standards, if these levels exceed the threshold it will cause a series of adverse effects on the environment, such as odor and turbidity. This is why it is required to treat the waste before discharged it into the environment.
Based on that problem, three UB Chemical Engineering students, under the Student Creativity Week in the field of exact research, conducted research related to methods of reducing BOD, COD, and TSS levels in batik waste.
This team consists of Herlinda Novianti, Nisau Ulya Durrotul Aniqo, and Erika Novita under the guidance of Nurul Faiqotul Himma, S.T., M.T.
In their research, these three students used a superhydrophobic modified silica aerogel composite membrane.
“According to the literature, membrane technology is widely used because of its advantages; easy to scale up, energy-efficient can be done continuously, and low operating costs,” explained Team Leader, Herlinda.
He continued, the main materials for superhydrophobic membranes are cotton cloth as a buffer for the membrane and silica aerogel.
Silica aerogel is used because it has a large surface area, high porosity (about 90%), and high hydrophobicity.
“This silica aerogel can also increase the strength of the membrane,” she concluded.
This research is expected to be able to contribute to the development of science and technology as well as the latest innovations in developing methods for reducing levels of BOD, COD, and TSS using silica-based membranes.
In addition, this research can be a solution to overcome the high levels of COD, BOD, and TSS so that it can overcome water pollution.
The team hopes that this research can be applied in the batik industry before the liquid waste is discharged into the environment so that the waste complies with the quality standards set by the government.
With this innovation, the team will strive to be able to represent UB in the upcoming 2021 National Student Scientific Week (PIMNAS). (humasft)