Water Pollution
Different types of wastewaters
Domestic wastewater
Domestic effluents are generated from activities such as bathing, laundry, cleaning, cooking, washing, and other kitchen activities. This contains a large amount of organic waste with suspended solids and coliforms. Calculations made based on available data show that half the organic waste is from the domestic sector (PEM, 2003).
As stated in the EMB report, domestic wastewater discharges contribute highest to the BOD load as the lack of sewage treatment system allows more than 90 percent of inadequately treated domestic sewage to be discharged into surface waters, which contain bacteria and viruses that threaten human life. Geographically, data show that one-third (30 percent) of BOD generation comes from Metro Manila and Region IV alone, at 18 and 15 percent, respectively (PEM, 2003).
Industrial wastewater
Reports show that the volume and characteristics of industrial effluents vary by type of industry and are influenced by different factors such as production processes and the scale of production used. Industries that are found to be water-intensive, i.e. food and dairy manufacturing, pulp, paper and paperboard products, and textile products, correspondingly discharge large amounts of wastewater (PEM, 2003).
Most of the water pollution-intensive industries are in National Capital Region, Calabarzon, and Region III. Food manufacturing industries, piggeries, and slaughterhouses are the main sources of organic pollution (PEM, 2004).
A report from a study conducted by the United Nations Industrial Development Organization (UNIDO) in 1999 emphasizes that the situation is even more critical with regard to hazardous wastes. In the said report, approximately 2,000 cubic meters of solvent wastes, 22,000 tons of heavy metals, infectious wastes, biological sludge, lubricants, and intractable wastes, as well as 25 million cubic meters of acid/alkaline liquid wastes are improperly disposed of annually in the Metro
Domestic wastewater
Domestic effluents are generated from activities such as bathing, laundry, cleaning, cooking, washing, and other kitchen activities. This contains a large amount of organic waste with suspended solids and coliforms. Calculations made based on available data show that half the organic waste is from the domestic sector (PEM, 2003).
As stated in the EMB report, domestic wastewater discharges contribute highest to the BOD load as the lack of sewage treatment system allows more than 90 percent of inadequately treated domestic sewage to be discharged into surface waters, which contain bacteria and viruses that threaten human life. Geographically, data show that one-third (30 percent) of BOD generation comes from Metro Manila and Region IV alone, at 18 and 15 percent, respectively (PEM, 2003).
Industrial wastewater
Reports show that the volume and characteristics of industrial effluents vary by type of industry and are influenced by different factors such as production processes and the scale of production used. Industries that are found to be water-intensive, i.e. food and dairy manufacturing, pulp, paper and paperboard products, and textile products, correspondingly discharge large amounts of wastewater (PEM, 2003).
Most of the water pollution-intensive industries are in National Capital Region, Calabarzon, and Region III. Food manufacturing industries, piggeries, and slaughterhouses are the main sources of organic pollution (PEM, 2004).
A report from a study conducted by the United Nations Industrial Development Organization (UNIDO) in 1999 emphasizes that the situation is even more critical with regard to hazardous wastes. In the said report, approximately 2,000 cubic meters of solvent wastes, 22,000 tons of heavy metals, infectious wastes, biological sludge, lubricants, and intractable wastes, as well as 25 million cubic meters of acid/alkaline liquid wastes are improperly disposed of annually in the Metro