Toxic and strong odour Silica Widespread and always present in 1-30 mg/l dissolved, suspended and colloidal states Essential element for certain aquatic plants - taken up by growth and released by decomposition and decay. Therefore seasonal variations Fluoride (F) Originates from weathering of 0.05-100 mg/l minerals High concentration is toxic to human Slight increase prevent dental caries; at higher concentrations (> 2 mg/l) mottling of teeth occur Boron Arises from weathering of rocks, soil 0.1-3 mg/l leaching, volcanic actions and other natural processes Boron may be used for increasing the crop yield Cyanide Toxic to humans Enters freshwater by industrial discharges (electroplating) APPENDIX 4: SITE SPECIFIC POLLUTION CONTROL CHECKLIST CATEGORY 1: MANUFACTURING INDUSTRIES Class Steps in Possible Environmental aspects Metal Receiving raw Verify types and origin smelting/ materials e.g. scraps, Check for dust production, emission, collection forging pig iron, sponge iron, methods (management), oil and chemicals Check for solid waste production, collection, and disposal methods Check for Leakage and spillage, Check for handling and storage of raw materials,
Toxic and strong odour Silica Widespread and always present in dissolved, suspended and colloidal states Essential element for certain aquatic plants - taken up by growth and released by decomposition and decay. Therefore seasonal variations 1-30 mg/l Fluoride (F) Originates from weathering of minerals High concentration is toxic to human Slight increase prevent dental caries; at higher concentrations (> 2 mg/l) mottling of teeth occur 0.05-100 mg/l Boron Arises from weathering of rocks, soil leaching, volcanic actions and other natural processes Boron may be used for increasing the crop yield 0.1-3 mg/l Cyanide Toxic to humans Enters freshwater by industrial discharges (electroplating) APPENDIX 4: SITE SPECIFIC POLLUTION CONTROL CHECKLIST CATEGORY 1: MANUFACTURING INDUSTRIES Class Steps in Possible Environmental aspects Metal smelting/ forging Receiving raw materials e.g. scraps, pig iron, sponge iron, oil and chemicals Verify types and origin Check for dust production, emission, collection methods (management), Check for solid waste production, collection, and disposal methods Check for Leakage and spillage, Check for handling and storage of raw materials,
GUIDELINES_FOR_WATER_RESOURCES_MONITORING_AND_POLLUTION_CONTROL_-FINAL_VERSION.docx