Hiroyuki NAGAI
Development of Resource Recovering Wastewater Treatment System for Natural Rubber Processing Wastewater
Assoc. Prof. Takashi YAMAGUCHI
Deproteinized natural rubber processing (DPNR) wastewater produced from a process to remove allergenic proteins in natural rubber latex is latex mixed liquid which has high organic amounts such as rubber content, proteins and SDS. For wastewater treatment we developed a novel system which recovers some resources from the wastewater. The 1st stage of the system is electrolyte dosing treatment which is able to remove SDS and recover coagulum. The 2nd stage is anaerobic treatment which makes it possible to remove organic matters and recover methane. In this study we investigated practicability and effectiveness of the treatment system. An optimum dosage of electrolyte (such as CaCl2) and the initial pH were determined by coagulation experiment of DPNR wastewater, additionally the process performances were evaluated on SDS removal and rubber recovery. By the treatment SDS was removed almost completely (99%), and 32,800 mgVS / L of rubber was recovered from the wastewater. After the treatment remaining organic matters (about 10,000 mgCOD / L) was supplied to an anaerobic bioreactor. Under the conditions of 6.4 kgCOD / m3 / d COD removal was achieved 84%, and methane recovery was 1.2 NL / L d. From these results, it was cleared that the system makes it possible to remove SDS and some organic matters almost completely, and recover rubber and methane effectively and continuously.
Please use "previous botton" to return the previous page