FORMATION POYENCIAL OF ACETIC ACID AS INTERMEDIATE COMPOUND FROM ACIDOGENESIS PROCESS OF COCOA SWEATINGS FOR RECOVERY PURPOSE

• Main Author: BILLQIS N.P. (NIM 25305006), MAHENSA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8506
• Institution: Institut Teknologi Bandung

The conversion of cocoa fruit to dried cocoa beans generates cocoa pulp waste which has not been well utilized. This research objective is to study the possibility of cocoa sweatings treatment to produce intermediate compound i.e. acetic acid. It is run on anaerobic Circulating Bed Reactor which is made from flexyglass that have 6 L capacities and operated in bacth system. Seeding and aclimatization is conducted until steady state. The operation of Circulating Bed Reactor (CBR) running I is carried out for 20 days at room temperature. Nitrogen flushing of 99,95% purity is established in the beginning of operation at one of two reactor used to see influence of O2 presence in the forming potencial of acetic acid. Checking of COD, VSS, alcohol, acetic acid, pH is done during the operation in 24-hours-basis. Gas analysis performed on certain time period. Result of acetic acid analysis indicates that reactor with attendance of O2 (reactor A-I) produce the highest concentration of acetic acid of 27.517,7 mg/L while the reactor without existence of O2 produce acetic acid concentration of around 15.035,5 mg/L. <br /> <br /> <br /> <br /> <br /> Then operation CBR running II is conducted by offer continous nitrogen flushing for one of two reactor to observe effect of H2 presence in the reactor. Reactor without H2 presence in the reactor (reactor B-II) was produce concentration of acetic acid approximately 21.650,35 mg/L. While reactor with attendance of H2 in the reactor (A-II) generous concentration of acetid acid just about 21.482,52 mg/L. Existence of certain amount of O2 in reactor, hence the acetic acid formation follows the aerobic pathway (reactor A-I). Nitrogen flushing in the early period caused concentration of O2 is relatively low so that is concluded that acetic acid formation reach the anaerobic pathway and run slowly (reactor B-I). Reactor among continous nitrogen flushing, concluded that acetic acid formation stay on anaerobic pathway from beginning of reaction (reactor B-II) because H2 has not established in the reactor and operate faster than reactor B-I. This research shows that the O2 presence in the reastor affect acetic acid formation pathway and existence of H2 in the reactor would block acetic acid formation.