A Comparative Study of the Physiomechanical Properties and Waste Water Qualities of Sosei Paper Made from SPWS and BWS

Masahito Yamauchi*, Tokio Hirata*, Yasushi Matsufuji**, Sumio Masuda***, Yuji Maeno*, Megumi Mihara**** and Kenjiro Yoneyama*****

* Dept.of Civil Engineering, Kagoshima National College of Technology
** Dept.of Civil Engineering, Fukuoka University
*** Dept.of Civil and Environmental Engineering, Miyazaki University
**** Dept.of Chemistry, Kagoshima National College of Technology
***** Aship Co., Ltd.

+ Correspondence should be addressed to Masahito Yamauchi:
(1460-1 Shinko, Hayato-cho Aira-gun, Kagoshima 899-5102 Japan)

Abstract

As an effective utilization of waste stillage, which will be banned from being dumped into the sea from the year 2001, the authors have been studying and succeeded in making sosei paper by using waste stillage from a sweet potato shochu distillery. However, sweet potato waste stillage (hereafter, SPWS) which has been used as the material for the making of sosei paper is difficult to supply, because it is produced only from September to December. On the other hand, barely waste stillage (hereafter BWS) is produced constantly through the year, and so it is in large quantity. This research has tried to make it clear that sosei paper can be produced by using BWS and to compare the physical and mechanical properties of sosei paper produced by using each waste stillage and also to consider the weight and property of waste water on molding samples. The following results were obtained: 1) Barely sosei paper was greater in destiny and less in strength than sweet potato sosei paper. 2) As for the grain size distribution, SPWS consisted of grains of different particle sizes. On the other hand, BWS consisted of grains of equally small sizes. 3) In order not to produce waste water in the process of adding pressure, BWS requires about 1.7times more old newspaper than SPWS. 4) As for the molding samples, the ratio of old newspaper to waste stillage is 1% and more than 70% of the COD, TOC, T-N components can be removed from the waste water in the case of SPWS, and more than 45% in the case of BWS.

Key words: sosei paper, sweet potato waste stillage, barley waste stillage, old newspaper, effective utilization, physiomechanical property, waste water quality