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SAI INTERNATIONAL SCHOOL
                                                      CLASS-VII

                                            SUBJECT - CHEMISTRY
                                TOPIC- MANAGEMENT OF WASTE WATER
                                         SUB TOPIC- WASTE WATER

                                                                    LESSON NOTE

                       Waste:


                       Anything that is useless and we do not need it anymore, is termed as waste.



















                       Waste water:


                       The dirty or polluted water that is generated after being used in various
                       domestic, industrial or agricultural activities is called waste water.

                        Pollution:-

                       The process of addition of unwanted substances in the atmosphere is called
                       pollution.

                       Water Pollution:


                       The discharged of undesirable substances into water bodies, is called water
                       pollution.

                       And the undesirable substances which cause pollution, are called as
                       pollutants.

                       As for examples chemical, smoke, dust etc.













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