Abstract
This study focuses on Actived sludge treatment is carried out by a continuous reactor. Merriote tube capacity of 10L with a discharge of 10L/day as an inlet. Next to the 10L volume aeration tank where biological treatment occurs, pH 7 ± 0.2 and DO ≥ 3mg/L are the control variables. COD, Cd and Ni are taken for testing inlet and outlet. Artificial waste is used as an inlet with a nutrient ratio of C: N: P is 100: 5: 1. Seeding stage occurs 13 days to get an MLSS value ≥ 2000mg / L. Acclimatization I for adapting microorganisms to the environment occurred for 27 days and acclimatization II for 11 days as microbial ada ptation to heavy metals. Increasing t h e C / N ratio f ro m 20 to 50 will reduce the efficiency of COD removal from 74.5% to 65.38%, Cd removal from 24.3% to 32.3% and Ni removal 13.8% to 28.5%. Initial metals reduced the efficiency of COD removal at low, middle and high levels by 82.5%, 71.75%, 55.875%, respectively. Initial metals at low, middle, and high levels were obtained Cd removal efficiency of 0%, 52.2%, 32.6% and Ni removal efficiency of 0%, 36.3%, 27%, respectively. Optimal response for COD removal is 68.5% with factor initial metal middle and ratio C/N 50.
Highlights
In the last few decades, heavy metal is one of the main environmental problems throughout the world
Biosorption occurs when the process of exchanging heavy metal ions with functional groups found in Extracellularly Polymeric Substances (EPS) [2]
Heavy metal biosorption experiments were carried out to find out the absorption capacity of Cd and Ni without reducing the ability of microbes in degradation of organic compounds represented by COD content
Summary
In the last few decades, heavy metal is one of the main environmental problems throughout the world. Treating wastewater using activated sludge is one of the most frequently used processes because of its low cost and absorption of toxic substances including Cadmium (Cd) and Nickel (Ni) [1]. Biosorption occurs when the process of exchanging heavy metal ions with functional groups found in EPS [2]. Microorganisms used in the removal of heavy metals are activated sludge from Penggaron Slaughterhouse microbial culture, Semarang. In describing the above problems, it is necessary to analyze the increase in biosorption of Cd and Ni heavy metals in wastewater without reducing the ability to degrade organic compounds.
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