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VOL.24 NO.2 (published in Dec-2016)

Photo in Cover :Kurume City Miyanojin Clean Center
VOL.24 NO.2 (published in Dec-2016)
Latest Trend of Mercury Emissions Regulations
Tomohisa OTA*
(*Technology Planning & Administration Dept. (Tokyo))

(Abstract)

The Minamata Convention on Mercury was adopted in Kumamoto, Japan in 2013 to reduce the global risk of health damage and environmental pollution caused by mercury. The amount of mercury emissions of Japan, which ratified the Convention in 2016 as the 23rd party to do so in the world, is as small as approximately 1 % of the world emission. Yet, given the past experiences in health damage and environmental pollution, Japan additionally set domestic regulations for the atmospheric emission of mercury and newly designated wastes consisting of mercury as industrial waste requiring special treatment to reduce mercury emissions in the world. Japan is also taking initiative in reducing mercury emissions as follows : prohibiting the import and export of regulated mercury which is above the requirement of the Minamata Convention on Mercury ; starting regulations on the use and production of mercury ahead of schedule ; and requesting some of the iron and steel manufacturing facilities which are not officially regulated for atmospheric emissions to voluntarily reduce the mercury emissions.

Operation Report of Okuyama Factory ( 170 t/ day incinerator) , Environment Division, Shimonoseki
Kohei BESSHI*
(*Environmental Engineering Dept. I)

(Abstract)

An incinerator processing 170 tons per day was installed in Okuyama Factory, the Environment Division, Shimonoseki City in March 2016. We constructed this new incinerator to replace the deteriorated incinerator processing 220 tons per day that we had constructed in 1987. Characteristics of this incinerator are that it is a non-catalytic denitration system, high-efficiency waste power generation, and a system that is compatible with current facilities. In regards to the non-catalytic denitration system, the system that mixes ammonium gas with compressed air and sprays it into the incinerator enables stable control of denitration. In regards to the high-efficiency waste power generation, the use of low-temperature catalyst and other measures achieved more than 20% of power generation efficiency, which was well above 15.5%, the requirement for being a high-efficiency waste power generation facility. In regards to the compatibility with current facilities, this facility was constructed next to an incinerator of another manufacturer processing 180 tons per day. Thus, this facility was constructed using independent structures so that it would not be regarded as the extension of the current incinerator under the Building Standards Act while functionally connecting the two incinerators. The results of performance tests satisfied guaranteed performance values in all categories.

Report of the Operation of Kurume City Miyanojin Clean Center
Shingo TADOKORO*
(*Environmental Engineering Dept. III)

(Abstract)

Kurume City Miyanojin Clean Center was constructed in June 2016. This Center consists of the waste-to-energy power plant containing incineration facilities and crushing and sorting facilities, the recycling plant for intermediate processing of cans, bins, PET bottles, and plastic containers, and the environmental community plaza for environmental education. Our independent operation standards which are stricter than pollution prevention standards are set for the operation of the incineration facilities. The performance test conducted after the construction and before transferring the facility to the client obtained results which satisfied standards in all categories. This report describes the result of the performance test conducted before the transfer and results of the operation of the fly ash circulation system and the high-efficiency waste power generation which are the characteristics of this facility.

Report of the Operation of a Biomass Incineration Plant of Paper Production Industry
Takashi YANO*,Tatsushi KAWAMOTO*
(*Energy Engineering Dept. II)

(Abstract)

Marusan Paper Mfg Co., Ltd. is a paper production company that reuses papers such as cardboards. It has been operating for more than half a century in Fukushima. The company is playing a leading role in the recovery and restoration of Fukushima after the Great East Japan Earthquake by renewing production facilities to make thinner and higher-quality base sheet of cardboard to save energy and resources. We delivered an incineration plant to this company to effectively use wastes generated from its factory as biomass fuel in January 2016. This report describes the structure of this plant and the result of a trial run which satisfied performance verification categories.

Report of the Operation of Low- temperature Heat Recovery Binary Power Generation
System in an Industrial Waste Incineration Facility
Takashi AMEMORI*1,Tatsushi KAWAMOTO*1,Tatsuhiko KIRIYAMA*2
(*1Energy Engineering Dept. II, *2Tochigi Hitrust Inc.)

(Abstract)

A low-temperature heat recovery binary power generation facility was additionally constructed to an already operating incinerator at Tochigi Hitrust Inc. in December 2014. This report describes its background, overview of the facility, and conditions of its operation. We came up with optimal plans under various restrictions for additional construction of a heat recovery system to an already operating facility and tried various ideas in its functions. Due to these attempts, the facility has been operating smoothly after the installation. Its effects included energy conservation by cutting 35.3 kL of crude oil consumption per year and cutting 70.5 tons of CO2 emissions per year.

Full- scale Demonstration on High- efficiency Nitrogen Removal Technology by
Fixed- bed Type Anammox Process ;Part 5
-Treatment Performance of Low- cost Operation-
Keita TAKAKI*,Tomoyuki DOI*,Kenichi SHISHIDA*
(*Sewerage Engineering Dept.)

(Abstract)

Using a full-scale fixed-bed type anammox process demonstration plant constructed at Tobu wastewater treatment plant at Kumamoto City, further cost reduction of this process is being considered after the completion of the B-DASH (Breakthrough by Dynamic Approach in Sewage High Technology Project) (2012-2013) of the Ministry of Land, Infrastructure, Transport and Tourism. The operation in 2015 was a continuous operation for about five months by lowering the water temperature of the nitritation tank from the usual 35℃ to 30℃. This operation successfully maintained stable operation of the nitritation tank and the anammox tank as usual. The nitrogen removal efficiencies of more than 80% were also obtained in the entire process, indicating a stable treatment performance. In addition, a stop-and-restart operation was conducted by stopping the operation during weekends based on the operation status of a dehydrator for about four months out of the five-month period. This operation did not influence the treatment performance, which remained stable throughout the period.

Real- time Calculation of Lower Heating Value of Waste using Laser Gas Analyzers,
its Application to Automatic Combustion Control and its Effects
Tomoya TSUBOTA*,Masaya WATASE*,Hiroyuki FUJIKAWA*
(*Electrical & Instrumentation Dept.)

(Abstract)

The authors developed a system for real-time calculation of the combustible components (C and H) in waste and the lower heating value of waste by installing a laser gas analyzers at the outlet of an incinerator. This calculation system uses the H2O and O2 concentrations in flue gas which are obtained through continuous measurement and the CO2 concentration obtained through calculation. Also, the estimation of the boiler evaporation rate based on the calculated lower heating value of waste successfully identified fluctuations in the evaporation rate approximately four minutes ahead of actual measurements. When the estimation of the boiler evaporation rate was applied to an automatic combustion control, the standard deviation of the actual measurement of boiler evaporation rate became 1.21% of the control value, meaning less than one third of the current automatic combustion control systems. In addition, the fluctuation of the O2 concentration at the outlet of an incinerator and the flow rate of flue gas in a stack became about half of the current automatic combustion control. The amount of power generation also improved by approximately 1 % and the suppression of TG Bypass steam flow rate is equivalent to approximately 0.5% power generation.