Abstract
The leather tanning industry was classified as industrial in large quantities and dangerous. One of the wastes that produced was waste liquid containing chromium ions. The liquid waste that was released was very cloudy, colored, and has rotten management that caused serious problems to water bodies, communities and the environment. The waste without special handling was discharged into the environment. So that with the ion exchange method, it could reduce environmental pollution caused by industrial leather tanning waste. This study aimed to determine the effect of resin in reducing the chromium ion content in the liquid waste of the leather tanning industry using the ion exchange method. Namely, by consolidating waste and resin with various predetermined variables. The positively charged chromium ion will exchange with the H+ ion found in dowex resin. So that the chromium levels in the tannery liquid waste could be reduced. The results were obtained by the contact time and weight of the resin used. The highest reduction in chromium ion content was at contact time for 80 minutes with a resin weight of 150 grams of 98.75%.
Highlights
One type of industry that uses hazardous and toxic materials (B3) in its production process is the leather tanning industry that uses chromium compounds. (Asmadi et al, 2009)
The chromium compounds in the tannery industrial wastewater come from the tannery production process, wherein tanning leather that uses chromium sulfate compounds, not all of them can be absorbed by the skin in the tanning process so that the rest is released in liquid form as liquid waste. (Sahlan et al, 2016)
Heavy metals are generally toxic to living things, some of them are needed in small amounts (Bugis et al, 2017)
Summary
One type of industry that uses hazardous and toxic materials (B3) in its production process is the leather tanning industry that uses chromium compounds. (Asmadi et al, 2009). Ion exchange can be used in wastewater treatment processes. The advantage of this method is its ability to capture heavy metals with high efficiency. The ion exchange process consists of a chemical reaction between ions (cations or anions) in the liquid phase and ions from the solid phase. The adsorption method is conventional but the most effective way to reduce chromium metal ions. In this study, using the ion exchange method using resins in the tannery industrial liquid waste which is expected to reduce the chromium ion levels in the liquid waste. This research aimed to determine the effect of dowex resin in reducing the chromium ion content in the tannery industry wastewater
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