In order to properly manage the risks associated with waste treatment, a push is on to promote the use of electronic manifests at all Kajima branches, and the new reporting forms are already in use at 40% of the branches. Electronic manifests are a boost to paperless operations, and can help to reduce recording errors and the loss of manifest forms.
Kajima has adopted zero emissions as a company-wide goal, while its branches and worksites have also set their own goals.
Construction site waste varies widely in terms of type, volume, and treatment method, depending on the surrounding environment and type of construction. Kajima has adopted a company-wide target for its final disposal rate, i.e. the percentage of total waste material that is not recycled. A project with a final disposal rate of under 5% is defined as having achieved zero emissions.
Selection of a waste handling firm
Waste handling contracts, which provide for the treatment of mixed waste, construction sludge, waste asbestos, and other such industrial waste, are not established separately for each construction site, but are entered into between waste treatment contractors and the manager of each Kajima branch. An environmental officer at a given branch inspects the facilities of waste treatment contractors to determine whether they meet Kajima's requirements, and draws up a list of qualified firms. Those in charge of individual construction sites within the territory covered by that branch then select a waste treatment contractor from the list. This approach ensures proper treatment of waste and lessens administrative burdens for both construction site operators and waste treatment contractors.
Adoption of Electronic Manifests
Construction waste volume and final disposal volume in FY2008
FY2008 waste volume by type
| Waste volume (tons) | Final disposal volume (tons) | Final disposal rate | Mixed waste volume (tons) | |
|---|---|---|---|---|
| FY2005 | 2,497,000 (1,476,000) | 301,000 (116,000) | 12 (7.9) % | 83,000 |
| FY2006 | 2,543,000 (1,579,000) | 316,000 (106,000) | 12 (6.7) % | 81,000 |
| FY2007 | 3,672,000 (2,792,000) | 181,000 (91,000) | 5 (3.3) % | 76,000 |
| FY2008 | 2,198,000 (1,364,000) | 245,000 (71,000) | 11 (5.2) % | 73,000 |
Note: Some figures for FY2007 have been changed to reflect an unordinary amount of concrete debris resulting from disaster-relief work following a major earthquake in Niigata.
| Asphalt/ concrete fragments |
Concrete fragments | Construction sludge | Mixed waste | Wood chips | |
|---|---|---|---|---|---|
| FY2005 | 1.1% | 0.9% | 19.7% | 36.3% | 4.0% |
| FY2006 | 1.1% | 1.4% | 18.9% | 37.4% | 5.3% |
| FY2007 | 0.1% | 0.4% | 10.2% | 21.5% | 1.2% |
| FY2008 | 2.0% | 1.4% | 20.9% | 29.6% | 2.4% |
| Construction surplus soil | 898,000 m3 |
|---|
