Integration of Cleaner Production and Waste Water Treatment on Tofu Small Industry for Biogas Production using AnSBR Reactor

¹ Mechanical Engineering Department, State Polytechnic of Semarang, Indonesia
² Doctoral Program of Environmental Science, School of Postgraduate Studies, Diponegoro University, Semarang
³ Department of Chemical Engineering, Faculty of Engineering, Diponegoro University, Semarang

^* Corresponding author: suparnirahayu@yahoo.co.id

Abstract

A research on developing a system that integrates clean production and waste water treatment for biogas production in tofu small industry has been conducted. In this research, tofu waste water was turned into biogas using an AnSBR reactor. Mud from the sewage system serves as the inoculums. This research involved: (1) workshop; (2) supervising; (3) technical meeting; (4) network meeting, and (5) technical application. Implementation of clean production integrated with waste water treatment reduced the amount of waste water to be treated in a treatment plant. This means less cost for construction and operation of waste water treatment plants, as inherent limitations associated with such plants like lack of fund, limited area, and technological issues are inevitable. Implementation of clean production prior to waste water treatment reduces pollution figures down to certain levels that limitations in waste water treatment plants can be covered. Results show that biogas in 16 days HRT in an AnSBR reactor contains CH₄(78.26 %) and CO₂ (20.16 %). Meanwhile, treatments using a conventional bio-digester result in biogas with 72.16 % CH₄ and 18.12 % CO₂. Hence, biogas efficiency for the AnSBR system is 2.14 times greater than that of a conventional bio-digester.