Environmental Knowledge Management - Recent Advances and Issues in Environmental Science - page 55

human health and the environment. The CSC has taken effective measures to reduce
the environmental risk and preserve natural resources through wastewater treatment
systems, the secondary water reuse system and the rain recycling system.
The CSC plantwide water recycling and reuse plan maximize the effi ciency of
water consumption and the recycling of 97.6% of water is normally achievable. A
signifi cant development of CSC in the area of water consumption is the reduction and
prevention of water pollution through water recycling and saving.
Figure 3 shows the trend of COD and SS over the past 7 years for CSC. The CSC
waste water treatment system has reduced the content of COD from 71 ppm in 2000 to
41 ppm in 2006 and that of SS from 9.7 ppm in 2000 to 4.4 ppm in 2006. This not only
reduces the total operating costs, but also achieves CSC environmental objectives.
Air Emission Control
The Environmental Surveillance Center of CSC established in 1995 continuously
monitors, analyzes and controls the emissions and effluents from the manufacturing
process. Three monitoring systems are used in pollution prevention and EM: Periph-
ery air monitors and displays boards, continuous monitors for off gases and year round
visual monitors. With the aim of increasing environmental protection, the high perfor-
mance of the air control system is shown in Figure 4; from the relative index, the emis-
sions of particulates, SO 2 and NO 2 in 2006 were 91%, 79%, and 67%, respectively
which are much lower than the same values measured in 1992 [44].
The important outcomes of the resource reducing project and the energy saving
program in CSC are shown in Table 3. The CSC reduces greenhouse gases through
internal and external improvement programs such as waste heat recovery, the appli-
cation of energy-saving in the producing process, improving the yield rate, regional
energy integration, the zero-waste project, etc.
Figure 2. The circulation of environmental knowledge in CSC.