"21 century type waste recycling enterprise" is what the company is going to be.

(Industrial Waste Close-up 2011.01)

Mie Central Development Co., Ltd.

Outline of Mie Recycle Center, Mie Central Development Co., Ltd.

Name : Mie Recycle Center, Mie Central Development Co., Ltd., Daiei Kankyo group
Address : 4713 Hachiya, Yonoazahachiya, Iga city, Mie prefecture 518-1152
URL : http://www.dinsgr.co.jp/
Established: August 8, 1980
Capital: 90,000,000 yen
Amount of sales (rough figure): 10 billion yen (in 2009)
Employee (rough figure): 400 persons
ISO14001: Certified in September, 1998
Plants owned: 1.Incinerator: 130 (65 x 2) t/day (24h), Power generation plant (800kW)
2.Drying plant: 90 m3/day (24h)
3.Sintering furnace: 200 t/day (24h)
4.RPF production facilities: 56t/day
5.Sludge solidification plant: 400 t/day
6.Wood chip production plant: 264.2 t/day (24h)
7.Geomelt detoxification plant: 4.75 t/day (24h)
8.Plastic recycle plant: 25 t/day (24h)
9.Neutralization treatment plant: 45.6 m3/day
10.Shredding and separation plant: A line 250 t/day, B line 98.4 t/day
11.Electrical equipment recycle plant: 20 t/day
12.Compost factory: 2.9 m3/day
13.Controlled type final disposal site: landfill capacity 2,875,896 m3
14.Others: (Asbestos dismantling line, Sorting station, Analysis center, Storage station, Water treatment plant)

Introduction

Daiei Kankyo group is one of the nation’s foremost waste management business group composed of 11 companies of the same capital with a core of Daiei Kankyo, and 9 affiliate companies (consortium with other companies). Among them, Mie Central Development is next to Daiei Kankyo in business size. Mie Recycle Center (hereinafter called “the Center”) is its waste management premises and one of the country’s major recycle centers in terms of the variety of handling wastes and business size. Now, the company is working on “Energy plaza construction project (scheduled to be in operation in 2013)” aiming at further expansion. This time JW visited Mie Recycle Center and interviewed Mr. Hirai, President of the Center and Mr. Shimamoto, Assistant Manager of Development Division on present and future approaches (Photo 1).

Mr. Hirai, President of the Center (left), Mr. Shimamoto, Assistant Manager (right)
Photo 1. Mr. Hirai, President of the Center (left), Mr. Shimamoto, Assistant Manager (right)

In this report, the outline of recycling by making use of a sintering furnace - a feature of the company, detoxification business and new business are presented.

Recycling and detoxification business by a sintering furnace

1. Recycling business

A sintering furnace (2.7Φx 32 m) is a kiln type furnace (Photo 2) having functions to detoxify hazardous substances by heating and sintering incineration ash at a temperature of 1,100℃ for about one hour, and to transform it to recyclable material as well. As for recycling of incineration ash, to transform it to slag by melting is a possible alternative, however, the sintering treatment has an advantage over the alternative taking into account of costs for energy and maintenance. As for incineration ash fed into the sintering furnace, about 80% of it comes from municipal solid waste and the remaining 20% comes from industrial waste. Mr. Hirai, President of the Center said, “Processed materials are used for civil engineering work materials such as pavement material so that there is no need to worry about the uses of recycled materials.” In addition to such a contract treatment, as a matter of course, incineration ash comes from a incinerator in the premise can be used as raw materials and heat thereof can be used efficiently as well. These are typical advantages that the Center has.

Sintering furnace (kiln type 200t/day)
Photo 2. Sintering furnace (kiln type 200t/day)

2. Detoxification business

While the above is about the use of a sintering furnace for recycling, its function of heating at a high temperature is useful for the detoxifying contaminated soil as well. Thus, the Center obtained the approval, the third case in Japan, of remediation facility from Mie prefecture based on the Soil Contamination Countermeasures Act. In addition, the Center obtained the permit of contaminated soil remediation business in June, 2010 and thus far carries out the detoxification of dioxin-contaminated soil. However, in the case of dioxin-contaminated soil of high concentration, a Geomelt plant is applied instead of the sintering furnace. Geomelt method is the way to detoxify hazardous substance of high concentration such as dioxins, PCB and such by melting contaminated soil at a high temperature of about 1,600℃ with electric Joule heat generation. Having these two-tier detoxification plants enables the Center to meet various customers’ needs.

Energy plaza construction project

As for an energy plaza construction project, Mr, Shimamoto, Assistant Manager said, “this project is like “Risk everything on one last throw of the dice”and as a matter of fact, we are confident of securing a necessary amount of waste and distribution routes for recycled products. His saying can be summarized as following 2 points:

  1. (1) Drastic capacity up of the thermal recycle plant
  2. (2) Creation of a thermal energy business

As for (1), the plant capacity is planned to be increased by 2 times or more by installing new plants including a incineration plant (200 t/day x 2 units), a sintering furnace (200 t x 1 unit), a sludge drying plant (100t/day x 1 unit), a carbonizing furnace (30 t/day x 1 unit), and a power generation plant (2,000 kW) (Figure 2). As for (2), thermal energy from such plants is planned to be collected with a thermal storage unit, and then supply/sell it to customers. As the thermal storage unit, “Deliverable trans-heat container” developed by SANKI ENGINEERING CO., LTD. is to be adopted. In this system, a tank filled with heat carrier oil inside is prepared, and then at a supply side, exhaust heat is transferred through a heat exchanger to a thermal storage tank , and then it is transported by a container to a demand side; at a demand side, operations are to be carried out in reverse order of that at the supply side to deliver heat to a customer. This system is, so to speak, a “Door-to-door heat delivery service”.

Completion image of energy plaza
Figure 1. Completion image of energy plaza

Closing remarks

As DATA shows, Mie Recycle Center has various plants. Many of them are omitted to introduce due to the limitations of space. Another opportunity is hoped to be available to introduce them.

(Reported by Ozaki, JW)