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CSR Charter ⅡHarmonizing with the Environment and Contributing to Realizing a Sustainable Society

Efforts in Resource Recycling

Aspects Determined as Materiality

  • Emissions waste

Principle and Outline

Osaka Gas is thoroughly implementing the 3Rs (reduce, reuse, recycle), cutting its resource consumption and waste generation, and endeavoring to reuse and recycle used resources in its efforts to help create a recycling-oriented society. We are recycling resources throughout our business activity value chain by such means as striving for zero emissions at LNG terminals, reusing gas meters, recycling gas pipe materials, reusing excavated soil from gas pipe installation, and recycling used gas equipment.

Consumption of Resources by Osaka Gas Group (* Including Consumption by Service Chains)

Toward achieving Environmental Action Targets

The final disposal rate of industrial waste* at LNG terminals in FY2017 was 0.1% (amount generated: 162 tons; amount of final disposal: 0.2 tons) against the 0% target, because 0.2 tons of waste were generated for which there was no option but final disposal. Locations other than LNG terminals achieved the target of FY2017 with a result of 0.7% (amount generated: 2,704 tons; amount of final disposal: 2.6 tons).

Regarding the general waste, final disposal rate was 2.6% (amount generated: 640 tons; amount of final disposal: 17 tons), which achieved the target for FY2017. We continue our effort for achieving the target for FY2018 by effective PDCA of company-wide Environmental management system (EMS).

* Final disposal of waste
Waste disposed of at authorized landfill sites.
Waste Generation and Disposal

Waste Generation and Disposal (tons)

  FY2015 FY2016 FY2017
Industrial waste LNG terminals Amount of waste generated 167.8 232.2 162.0
Amount of final disposal 0.4 0.6 0.2
Final disposal rate 0.2% 0.3% 0.1%
Others Amount of waste generated 2,705.3 2,882.1 2,703.6
Amount of final disposal 35.2 26.0 17.7
Final disposal rate 1.3% 0.9% 0.7%
General waste Amount of waste generated 788.5 707.3 640.3
Amount of final disposal 18.0 17.0 16.8
Final disposal rate 2.3% 2.4% 2.6%

① Industrial Waste Generated by Osaka Gas (t): Scrap Metal, Rubble, etc.

Waste type Item in detail Amount of waste generated ( a ) Amount of final
disposal ( b )
Final disposal rate
( b / a )
FY2015 FY2016 FY2017 FY2015 FY2016 FY2017 FY2015 FY2016 FY2017
Sludge Wastewater sludge 83 150 256 5 1 2 6% 1% 1%
Waste oil Lubricating oil, wash oil, used cooking oil 87 116 77 1 1 2 1% 1% 3%
Waste plastics PE pipe debris, used insulating material, used display panels 625 635 602 17 13 7 3% 2% 1%
Metal debris Excavated pipes, flexible pipes 920 1,089 639 6 2 2 1% 0% 0%
Glass, concrete, ceramics Used fluorescent lamps, used tiles 15 19 13 0 1 0 0% 3% 1%
Debris Waste asphalt and concrete 922 761 1,001 0 3 0 0% 0% 0%
Others Rubbers, waste antirust agents, used gas appliances 221 344 279 6 5 5 3% 2% 2%
Osaka Gas Total 2,873 3,114 2,866 36 27 18 1% 0.9% 0.6%
Breakdown LNG terminals 168 232 162 0 1 0 0% 0% 0%
Other sites 1,264 1,454 1,300 32 23 15 3% 2% 1%
Customers * 1,441 1,428 1,404 3 3 3 0% 0% 0%

② Industrial Waste Generated in the Service Chain (t): Scrap Metal, Glass, etc.

Waste type Amount of waste generated ( a ) Amount of final disposal ( b ) Final disposal rate
( b / a )
FY2015 FY2016 FY2017 FY2015 FY2016 FY2017 FY2015 FY2016 FY2017
Used gas appliances, used home fixtures and equipment 2,330 2,232 1,719 359 305 219 15% 14% 13%

③ Industrial Waste Generated by the City Gas Business (t) ( = ① + ② )

Amount of waste generated ( a ) Amount of final disposal ( b ) Final disposal rate
( b / a )
FY2015 FY2016 FY2017 FY2015 FY2016 FY2017 FY2015 FY2016 FY2017
5,203 5,346 4,585 395 331 237 8% 6% 5%
* Waste from customers
Waste metals and gas pipes generated at contract construction

General and Industrial Waste by Category (t)

Waste type Amount of waste generated ( a )
FY2015 FY2016 FY2017
Paper categories Copy paper 20 14 11
Newspaper 48 42 39
Magazines 171 121 106
Cardboard 180 168 141
Confidential documents 148 145 141
Paper subtotal 567 489 438
Cans 5 4 4
Bottles 5 4 4
Food scraps 94 97 90
Plastics 14 15 20
Others 103 98 84
General waste total 789 707 640

Volume of water intake

(1,000 m³ )

  FY2015 FY2016 FY2017
General water, water for industrial use 1,825 1,464 1,525
Underground water 0 0 0
Sea water 399,885 390,721 398,016

Volume of water discharge

(1,000 m³ )

  FY2015 FY2016 FY2017
Discharge into sewage systems 407 415 412
Discharge into rivers 0 0 0
Discharge into the sea 401,112 391,629 398,994

Resource Consumption at Affiliates

Results for Industrial Waste Reduction and Recycling at Affiliates (t)

Waste type Item in detail Generated ( a ) Final disposal ( b ) Final disposal rate
( b / a )
FY
2015
FY
2016
FY
2017
FY
2015
FY
2016
FY
2017
FY
2015
FY
2016
FY
2017
Sludge Wastewater sludge 1,462 2,217 2,220 773 1,087 906 53% 49% 41%
Waste oil Lubricating oil, wash oil, used cooking oil 150 182 235 3 4 71 2% 2% 30%
Waste plastics PE pipe debris, used insulating material, used display panels 1,083 1,170 1,711 390 432 704 36% 37% 41%
Metal debris Excavated pipes, flexible pipes 810 1,000 1,238 73 149 493 9% 15% 40%
Glass, concrete, ceramics Used fluorescent lamps, used tiles 837 815 1,578 606 595 1,159 72% 73% 73%
Debris Waste asphalt and concrete 2,370 1,901 2,454 1,250 102 94 53% 5% 4%
Others Rubbers, waste antirust agents, used gas appliances 72,993 70,698 80,410 817 470 866 1% 1% 1%
Osaka Gas Total 79,705 77,983 89,846 3,911 2,838 4,292 4.9% 3.6% 4.8%
Breakdown Electric power companies 41,634 42,705 51,592 556 729 567 1% 2% 1%
Regional air-conditioning service companies 65 100 510 32 44 15 50% 44% 3%
Others 38,006 35,177 37,745 3,323 2,065 3,709 9% 6% 10%

Volume of water intake

(1,000 m³ )

  FY2015 FY2016 FY2017
General water, water for industrial use 9,014 9,085 9,602
Underground water 1,985 3,553 3,475
Sea water 194,844 131,573 188,448

Volume of water discharge

(1,000 m³ )

  FY2015 FY2016 FY2017
Discharge into sewage systems 1,232 1,360 1,377
Discharge into rivers 1,781 3,029 1,257
Discharge into the sea 196,564 133,107 189,364

Resource Recycling Efforts at the Osaka Gas Group

Use of recycled soil at gas pipe construction

The Osaka Gas Group works to reduce the amount of excavated soil and waste asphalt generated as a result of gas pipe installation, which contributes to reduce impact on the ecosystem. Ways to achieve this include the Vermeer method, which requires soil excavation of only two points, and the shallow pipe installation method. In FY2017 these methods allowed us to reduce the amount of excavated soil generated by 490,000 tons compared to what would have been generated using conventional methods.

Our soil and asphalt recycling system promotes the reuse of waste asphalt and excavated soil as either recycled asphalt, regenerated roadbed material, or improved soil. These efforts allowed us to reuse 89% of material excavated during gas pipeline construction in FY2017 and send to final disposal just 10,000 tons.

(10,000 tons)

  FY2013 FY2014 FY2015 FY2016 FY2017
(1) Estimated amount

generated by

conventional method

145 139 131 130 120
(2) Reduced amount 60 55 51 51 49
(3) Generated amount ((1)-(2)) 85 84 80 80 71
(4) Recycled amount 80 75 70 71 63
(5) Recycling rate ((4)/(3)) 94% 90% 88% 89% 89%
(6) Utilized amount 4 8 9 8 7
(7) Final disposal amount

((3)-(4)-(6))

0.7 1.0 1.2 1.1 1.0

Final Disposal Amount of Excavated Soil and Recycling Rate

Final Disposal Amount of Excavated Soil and Recycling Rate

Reuse of Excavated Soil at Osaka Gas

Reuse of Excavated Soil at Osaka Gas

Replacing pipes without excavation

The method of replacing pipes without excavation is a method of burying polyethylene (PE) pipes in which only each end of the construction stretch is excavated. Not only does this these methods result in less excavated soil, it they also reduces the impediment of traffic around the construction site.

Vermeer method

The Vermeer method is a method to lay polyethylene (PE) pipes over long distances, with excavating from only both end points of the pipe.

First, jets of muddy water are sprayed from the tip of the drill to make it easy to drill and, while confirming from the ground above the tip of the drill, a steel rod is inserted into the ground. After reaching the correct position, the rod is connected to polyethylene pipes and then pulled back up, pulling the polyethylene pipes with it.

Vermeer Method - a Non-excavating Method

Vermeer Method - a Non-excavating Method
  • Non-excavation method: method for laying 100-200 A PE pipes without excavating.
  • Horizontal directional drill: A machine that establishes the planned route by piercing through the ground.
  • Reamer: A tool for expanding the initial hole to a size large enough for gas pipes.

Promotion of the shallow pipe installation method

Shallow pipe installation method, authorized in 1999, allows the laying of shallower pipelines than before. As a result, excavation widths became narrower and it became possible to greatly reduce the amount of excavated soil generated when laying gas pipes and restored afterward, mitigating environmental impacts.

Comparison of Conventional Gas Pipe Installation Method with Shallow Pipe Installation Currently in Use

Comparison of Conventional Gas Pipe Installation Method with Shallow Pipe Installation Currently in Use

Recycling of used gas pipes

The polyethylene (PE) pipes waste material generated at work sites is mainly used as covers to protect gas pipes and as post markers to indicate the location of supply pipes. In FY2017, 201 tons of PE pipe waste was generated and all was reused. Metal pipes, such as steel and cast-iron pipes, are sold to electric furnace manufacturers and recycling companies, who use them as raw materials for products.

PE Pipe Recycling Rate (t)

  FY2013 FY2014 FY2015 FY2016 FY2017
Amount of waste
re-collected
191 215 198 200 201
Amount of resources recycled 191 215 198 200 201
Recycling rate 100% 100% 100% 100% 100%

Recycling of used gas appliances

Hot water dispenser and iron used in the product, which is to be recycled into other materials

Hot water dispenser and iron used in the product,
which is to be recycled into other materials

In FY2017, the Osaka Gas Group re-collected 1,017 tons of used gas appliances, and 90% of the total was recycled into metal.

Electronic issuance of a manifest certifying waste disposal via the Osaka Gas Group's e-cycle system

The Osaka Gas Group has developed a unique “e-cycle” system to expedite waste disposal through the issuance of a manifest certifying each disposal process. Under the system, gas appliance sales agents, waste shipping firms, and disposal companies are connected to each other via the Internet. After the gas equipment collected by the sales agents is handled appropriately by the shipping firms and the disposal companies, a manifest certifying each process of disposal is issued. The general public can expeditiously confirm the disposal through the manifest. The manifest system is intended to promote the appropriate disposal of industrial waste disposal. When a company consigns industrial waste disposal to a third party, the company is obligated to issue a manifest certifying that the re-collection and disposal to the party after disposal has been carried out as intended.

Such a manifest is electronically issued, as the Osaka Gas Group's e-cycle system is connected to the Japan Industrial Waste Information Center (JWNET) through the EDI.*

* EDI
EDI stands for electronic data interchange. Electronic data are exchanged between the JWNET and Osaka Gas's e-cycle system.

Compliance with the Home Appliance Recycling Law

The Osaka Gas Group appropriately disposes of gas air conditioners for household use and clothes dryers, covered by the Home Appliance Recycling Law, in line with the law.

In FY2017, about 159 tons of gas air conditioners for household use were collected, and 90% of them were recycled, higher than the minimum mandatory recycling rate of 80%. The amount of clothes dryers collected during the same year came to about 13 tons, 87% of which was recycled, far above the mandatory recycling rate of 82%.

Air Conditioners

  FY2013 FY2014 FY2015 FY2016 FY2017
Number of units recycled (units) 5,780 5,724 4,624 4,093 3,870
Gross weight recovered (t) 242 t 240 t 193 t 170 t 159 t
Weight recycled (t) 214 t 212 t 173 t 154 t 144 t
Recycling rate 88% 88% 89% 90% 90%

Clothes Dryers

  FY2013 FY2014 FY2015 FY2016 FY2017
Number of units recycled (units) 331 516 373 345 321
Gross weight recovered (t) 12 t 19 t 14 t 13 t 13 t
Weight recycled (t) 9.8 t 16 t 12 t 12 t 11 t
Recycling rate 82% 84% 85% 88% 87%

Reusing of gas meters

Gas meter which is taken apart after 10 years in use

Gas meter which is taken apart after 10
years in use

Gas meters which are reused

Gas meters which are reused

To measure the amount of gas used by customers, Osaka Gas has installed approximately seven million gas meters. Under the Japanese Measurement Law, these devices must be replaced every 10 years.*1

After 10 years in use, gas meters are repaired (taken apart, inspected, and fixed) to make them perform as well as new ones. They are then installed at customer sites. In the past, this type of repair was conducted a third time to give the gas meters a total lifespan of 40 years. After conducting evaluations including durability tests*2 jointly with the gas meter manufacturers, we came to a decision that these gas meters can be used another 20 years if twice of additional repairs are conducted.

As a component material, around 2 kg*3 of aluminum is used in each gas meter body. Reusing gas meter reduce 80%*4 of CO2 emissions, that includes CO2 emission that would have been emitted in the process of casting a new gas meter body, giving a cumulative total reduction of 85,000 tons over the next 20 years, compared with producing new meters.

*1 Replacement of meters
Some exceptions apply. (Meters from #25 or higher need to be replaced every seven years)
*2 Durability test
Cyclic tests, accelerated temperature tests, etc.
*3 Calculation of aluminum use
A body of gas meter contains approximately 2 kg (average of from #2.5 to #6) of aluminum.
*4 Calculation of CO2 emissions
Calculated with new meters also using regenerated aluminum.

Recycling of used alarm devices and styrene foam used for packaging

More than half of used alarms and machine-wrapping styrene foam had been incinerated or put into landfill in the past. However, we have been recycling all of them since FY2013 by converting them into so-called RPF, or refuse paper & plastic fuel.

And since November 2014, Osaka Gas has been reclaiming rare metals contained in the substrates of alarm devices and recycling plastics used in the devices.

Used alarm devices

Used alarm devices

Used alarm devices

Used styrene foam from wrapping Machines

Used styrene foam from wrapping Machines

RPF (Refuse Paper & Plastic Fuel)

Expanded use of returnable packages

In accordance with our "Green Purchasing Policy" (formulated in 2000 and revised in 2012), Osaka Gas have been cooperating with business partners in "Green Purchasing" that prioritizes the procurement of eco-friendly products and installation contracts.

Osaka Gas is reducing the amount of material used for gas appliances packaging. For "Eco-Jozu" high-efficiency water heaters, we introduced returnable packaging that can be reused about 10 times and expanded its use in FY2013. In FY2017, the number of units shipped with returnable packaging (1,595 units) was about 2% of all "Eco-Jozu" shipments

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