Combination of Electrocogulation and Aeration Processes by Addition NaCl for Leachate Treatment

Abstract

Leachate is water which is formed in a pile of garbage that dissolves a lot of existing compounds so that it has a very high pollutant content, especially organics substances. Leachate has the potential to cause water pollution, both surface water, ground water and underground water, so it needs to be managed properly. Leachate processing uses a combination of electrocoagulation and aeration methods. The objective of this study is to determine leachate characteristics before and after the processes, the optimum treatment conditions, and the effectiveness of the treatment processes in reducing pollutant content. Electrocoagulation is able to reduce the characteristics of the waste pollutant content in terms of increasing pH and decreasing total disolved solid (TDS), total suspended solid (TSS), chemical oxygen demand (COD), biological oxygen demand (BOD5), and waste turbidity. This condition occurs due to the process of coagulation of pollutants by applying electric current to electrochemical reactions. The working principle of electrocoagulation is the dissolution of anode metal (M+), which reacts with hydroxyl ions (OH-) to form coagulants. The experiment was conducted in batch, where the leachate is put into an electrochemical cell containing 2 aluminum electrodes with dimensions of 10 cm x 10 cm. The parameters varied are the aeration process and variations in the addition of NaCl. The optimum conditions are achieved in the electrocoagulation process with aeration and the addition of 2 g/L NaCl. The most significant processing effectiveness of the process is TDS 34.06%, TSS 81.46%, COD 54.26%, BOD5 53.76%, and turbidity 92.92% respectively.

Clinoptilolite augmented electrocoagulation process for the reduction of high‐strength ammonia and color from stabilized landfill leachate

“…Therefore, in this research, the novel method of zeolite (clinoptilolite) augmentation on the electrocoagulation process was investigated as a co‐treatment for the elimination of high‐strength ammonia and color from a saline landfill leachate which acts as a natural electrolyte. Furthermore, there is no additional electrolyte needed in this study as opposed to many other studies by Mohajeri et al (2018), Kumar and Sharma (2019), and Rusdianasari et al (2020). In addition, in the current work, the leachate concentrations were in a stabilized form, more concentrated and not easily amendable by biological process.…”

Stabilized Leachate Treatment Using Aerated Electrocoagulation to Reduce Ammonia Nitrogen and Colour Removal

“…Wahidah [9] stated that as pH increases to alkaline, the ions will coagulate in a weaker state which reduce the removal performances. In general, the pH of the sample will be varied when the EC carried out depends on the electrode materials and initial pH [24], during the process as result of the H2O oxidation reactions generated at the cathode, and successive OHions are formed in the electrolytic medium [25]. The result of the study found the optimal removal of colour and ammonia nitrogen were 68.65% and 48.30% respectively and found the highest removal percentage both at pH 5.…”

Study on Ammonia and Colour Removal from Leachate via Aerated Electrocoagulation (Ferum and Aluminium Electrode)

“…The same research shows Colour Ammonia that the maximum removal efficiency of NH₃-N occurs at initial pH of 7.5, with the percentage of NH₃-N removal at 25.3%. Increasing in pH in the EC process was due to the production of hydrogen at the cathode electrode and the discharge of hydroxide ions from ferum hydroxide [12]. For colour removal, [20] carried out an AEC experiment for distillery spent wash by using aluminium and ferum electrodes, the results of the studies showing the maximum colour removal happened at 25 V of current density and pH 8 with the percentage of colour removal was 99.78%.…”