Ordinance on Prevention of Hazards Due to Specified Chemical Substances

Ministry of Labour Ordinance No. 39 of September 30, 1972

Chapter III. After-Use Disposition

(Dust Exclusion)

Article 9. With reference to the exhaust ducts of the manufacturing facilities by which gases containing dust of group-2 substances are exhausted or local exhaust ventilation systems by which gases containing dust of group-1 or group-2 substances are exhausted in accordance with provisions of Article 3, paragraph 3 of Article 4 or paragraph 1 of Article 5, the employer shall provide dust exclusion devices in any one of the systems with performance of dust exclusion as set forth in the right column of the Table given below, according to the diameters of dust granules as shown in the left column of the same Table, or also with dust exclusion devices with the same or better performance as or than that mentioned above.
2. The employer shall provide the said dust-exclusion devices, as set forth in the preceding paragraph, with pre-set dust removers for elimination of dust granules in large diameter, if necessary.

3. The employer shall make the said dust-exclusion devices as set forth in the preceding two paragraphs operate effectively.

Diameter of dust granule (in unit of microns)	Dust exclusion method
Less than 5	Dust filtration Electrostatic precipitation
5 or more but less than 20	Liquid scrubbing Dust filtration Electrostatic precipitation
20 or more	Multi-cyclone dust shields (which correspond to those in which one cyclone is installed for disposition of gas in quantity of less than 20m³ per minute) Liquid scrubbing Dust filtration Electrostatic Precipitation
Remarks: Diameters of dust granules listed in the Table correspond to those which are noted at the maximum frequency in the distribution of diameters of dust as measured according to the weight method.

(Exhaust Gas Disposition)

Article 10. With reference to the exhaust ducts of the manufacturing facilities which emit gases or vapours of the substances listed in the left column in the Table given below or local exhaust ventilation systems installed in accordance with provisions of paragraph 3 of Article 4 or paragraph 1 of Article 5, the employer shall provide exhaust gas disposition devices in the method of disposition as described in the right column of the same Table, or exhaust gas disposition devices with the same or better performance as or than the said devices.

Substance	Disposition method
Acrolein	Absorption method Direct combustion method
Hydrogen fluoride	Absorption method Absorption method
Hydrogen sulfide	Absorption method Oxidation and reduction method
Dimethyl Sulfate	Absorption method Direct combustion method

2. The employer shall effectively operate effectively the said exhaust gas disposition devices as set forth in the preceding paragraph.

(Discharged Fluid Disposition)

Article 11. In terms of discharged fluid (exclusive of fluid discharged from the facilities thereby to manufacture group-1 substances), containing substances listed in the left column of the following Table, the employer shall provide discharged fluid disposition devices in any one of the styles for disposition of discharged fluid as described in the right column of the same Table, or ones with the same or more effective performance as or than the said devices.

Substance	Disposition method
Alkyl mercury compounds (restricted to the substances in which the alkyl radicals are methyl or ethyl radicals, hereinafter the same)	Oxidation-reduction method
Hydrochloric acid	Neutralization method
Nitric acid	Neutralization method
Potassium cyanide	Oxidation-reduction method Activated sludge method
Sodium cyanide	Oxidation-reduction method Activated sludge method
Pentachlorophenol (otherwise known as PCP) and its sodium salts	Aggregation-precipitation method
Sulfuric acid	Neutralization method
Sodium sulfide	Oxidation-reduction method

2. In terms of discharged fluid disposition devices prescribed in the preceding paragraph, or drainage or pits leading to those devices, the employer shall provide them in the structure thereby to prevent the mixture of the following types of discharged fluids when it is feared that the generation of hydrogen cyanide or hydrogen sulfide may occur by mixing of discharged fluid containing hydrochloric acid, nitric acid, or sulfuric acid with discharged fluid containing potassium cyanide, sodium cyanide, or sodium sulfide.
3. The employer shall effectively operate effectively the discharged fluid disposition devices as described in paragraph 1.

(Remnants Disposition)

Article 12. As for remnants that contain alkyl mercurycompounds, the employer shall not discharge them until he/she has detoxified them.

(Rag Disposition)

Article 12-2. In terms of rags, paper scraps, etc., contaminated with said specified chemical substances, etc., the employer shall take measures such as putting the rags, paper scraps, etc., into impermeable containers coupled with their covers or stoppers in place thereby to prevent workers from being contaminated with the said specified chemical substances, etc.

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