Technical informationTECHNOLOGY

VOL.21 NO.2 (published in Dec-2013)

VOL.21 NO.2 (published in Dec-2013)
Act on Promotion of Recycling of Small Waste Electrical and Electronic Equipment
Tomohisa OHTA*
(*Tokyo Technology Research & Planning)


In order to promote recycling of metal resources contained in the small waste electrical and electronic equipment such as mobile phones and personal computers, the "Act on Promotion of Recycling of Small Waste Electrical and Electronic Equipment" has been enforced since Apr. 1, 2013. This law is a promotional system requiring all those concerned to play their appropriate roles in cooperation. In order to ensure efficient collection and recycling of small waste electrical and electronic equipment, the Act requests positive participation under appropriate role-sharing such as (1) the consumers and business operators to properly take out the trash, (2) the municipalities to implement sorted collection of the trash, (3) the retailers to cooperate the consumers in properly taking out the trash, (4) the manufactures to manufacture easily recyclable products and utilize the recycled resources, and (5) the government to secure the funds and make educational and publicity activities. As a recycling encouraging measure, government-certified business operators system will be set up to positively address a recycling project. To encourage recycling of the small waste electrical and electronic equipment, a wide range of public participation and cooperation is also demanded.

Operation Report on "Tamamura-machi Clean Center" and CO2 Reduction Effect of Key Equipment Improvement Work
Nobuo AKAE*
(*Environmental Engineering Dept. Ⅱ)


Key equipment improvement work of the waste incineration plant for Tamamura-machi was completed in Mar. 2013. This improvement work was designed to improve the aged facility which had been running over 20 years and respond to higher-calorie waste composition than initially intended one, and they have been properly operating to date after handover. By employing lower air ratio combustion than the existing facility, inverter based blowers and high-efficiency electric motors, this plant successfully reduced CO2 emissions by 45% in a confirmation test conducted with the same waste incineration amount as before the improvement work.

Lakeside Energy from Waste Facility Availability
Ryoji TANI*
(*Environmental Engineering Dept. Ⅱ)


This facility is a general waste incinerating power generation facility delivered to the United Kingdom in Jan. 2010. An annual availability test was conducted after handover according to the contract provisions. The pass criterion of this test was extremely high at 87% or more annual availability in MCR equivalent, but we obtained a favorable test result of over 90%, successfully passing the test.

Operation Report on Temporary Disaster Waste Incinerators (Soma-city and Shinchi-machi)
(*Environment Engineering Dept. Ⅱ)


A huge amount of disaster waste was generated in the disaster-stricken areas by the earthquake and tsunami of the Great East Japan Earthquake on Mar. 11, 2011. This report describes the design background and operation condition of the temporary disaster waste incinerators whose construction order was received from the Ministry of Environment in May 2012 for early reconstruction of the disaster-stricken areas. This facility has incineration capabilities of 150 tons/day each for the Nos. 1 and 2 incinerators, or step grate stoker furnaces, and 270 tons/day for the No. 3 incinerator, or a rotary grate stoker furnace, totally 570 tons/day. An availability test was conducted in Feb. 2013 to confirm that each guaranteed performance is satisfied. Including measurement of radioactive material concentration and air dose rate, operation management was reliably implemented, 2012 operation services were completed, and this facility was completed at the end of Mar. 2013.

Operation Report for New Single-pass-type Bagasse Fired Boiler in Thailand
Masahide YAMASHITA*,Kosaku OMORI*and Kokichi KUMASHIRO*
(*Energy Engineering Dept. 1)


Nowadays in Thailand, the content of sand in the fuel for bagasse fired boiler is increasing due to the mechanization of cane harvesting. As the countermeasure to this sand increasing in bagasse, we designed the new single-pass-type bagasse fired boiler that has no gas baffles which change the direction of flue gas flow. We have already supplied total 4 sets of this new type boiler for Mitr Phol Bio-Power (Phu Luang) Co., Ltd. (hereinafter, we call as "M. P. B.") and TSM Power Co., Ltd.. It was observed at M. P. B. that the actual performance of boiler is satisfied with the design values and the emission level of boiler is lower than the design values. In this article, we report the outline and the operation record of this new single-pass-type bagasse fired boiler in M. P. B.

Removal System of Radioactive Cesium in MSW Incineration :t-RECs® (2nd Report)
Muneharu FUJIKAWA*,Takahiro IWAMOTO*and Takashi KAWANO*
(*Energy and Environmental Development Dept.)


This is the 2nd report on the "t-RECs®" system of the efficient removal ofce sium from the fly ash of municipal solid waste (MSW) incineration. In the cesium extraction process, we studied a liquid-solid ratio, washing time and washing temperature as factors affecting extractability. In the cesium concentration process, we confirmed that ifa concentrated cesium liquid obtained by treating fly ash washing water with a molecular recognition adsorbent is immobilized to zeolite, the usage ofze olite will be reduced to 1/200 ofdirec tly adsorbing cesium in fly ash washing water with zeolite. We also conducted an on-site demonstration test with full-scale equipment to treat fly ash containing radioactive cesium, and obtained performance equivalent to a laboratory scale. In calculation of volume reduction effect concerning final discharge, it was clarified that when concentrating up to 1,000,000 Bq/kg, there is a 280-fold volume reduction effect compared with the conventional methods.

Combustion Behavior of Cesium in MSW Incineration Process
Takashi KAWANO*,Taku IGUCHI*and Takayuki SHIMAOKA**
(** Energy and Environmental Development Dept.
** Faculty of Engineering, Kyushu University


It was confirmed how cesium contain in waste behaved depending on the types of wastes and their combustion conditions. Using 5 types of wastes (1. RDF(2typs), 2. wood chips consisting of construction waste, 3. RPF, 4. sewage sludge), stable cesium was added to respective waste, and then, they were combusted in a laboratory test using an electric furnace and a pilot test using a stoker type incinerator, and checked for a cesium residual rate in combustion residue (amount of insoluble cesium in the residue/additional amount of cesium). As a result, it was found out that the cesium residual rate differed (5 to 20% for RDF, 30% for wood chips, 30% for RPF, 85% for sewage sludge) depending on the types of combusted waste in both laboratory and pilot tests.

2nd-Generation Biodiesel Fuelization Technology
-Basic Tests of Biodiesel Production-
Kazuki HAYASHI*,Kazuhiro SATOH*,Yoshitada KAKUTA*
and Kazuo NAKAMURA**
(* Energy and Environmental Development Dept.
** Advanced Scientific Technology & Management Research Institute of Kyoto


We have been joining the research and development project of "2nd-generation biodiesel production technology" (sponsored by Ministry of Environment, "Technological Development and Empirical Research Project for Global Warming Countermeasures") mainly composed of Kyoto City and Advanced Scientific Technology & Management Research Institute of Kyoto as a member of the Technical Study Meeting. This project is intended for manufacturing high-quality biodiesel fuel and securing compatibility in its utilization for vehicles by combining fuel refining (hydrogenation) technology with waste cooking oil fuelization technology (catalytic cracking). In the first year of 2012, basic tests were conducted on fuel manufacturing and refining, achieving the yield of 55 vol% for cracked distillate (light oil) and 70 vol% (theoretical yield of 85 vol%) for heavy content and naphtha content inclusive by controlling the conditions such as reaction temperature in catalytic cracking reaction. Also, it was confirmed that olefin was converted into paraffin by hydrogenation of cracked distillate at an oil refining company, obtained through catalytic cracking, and that biodiesel fuel having oxidation stability equivalent to commercially available light oil was obtained.

Demonstration of Waste Water Recycling System Using Reverse Osmosis Membrane at Waste Incineration Facility
Hidehiro IWAMI*
(* Water Treatment Technology)


A demonstration test was conducted on an RO membrane treatment system as a means to satisfy a waste water closed (no discharge) system and high-efficiency power generation requested by recent waste incineration facilities. Test equipment was installed in the waste incineration facility and actual waste water was used to conduct the test. As a result of the test, the MF+RO membrane treatment system may require incidental equipment such as activated carbon depending on the inlet condition, but it was found out that the system was applicable as waste water treatment for the waste incineration facility, and that the quality of treated water thereby was good enough to be recycled as plant water such as device cooling water.