Transcript WASTE
Water Unit: ENVIRONMENTAL SCIENCE 302 LOCH How sure are you? CREATE A KWL CHART Each student reads the next slide Go to the website on the wikipage http://www.wef.org/flash/gowiththeflow_english/theflow.htm This will teach you basic information about the wastewater treatment plant 1. The SOURCES of wastewater 2. The STEPS in treatment (primary, secondary, advanced) 3. The FATE of the end products Today: Create a graphic organizer to follow along and organize your info Longterm: you have until class Friday to show me – everyone in the class that is – that you understand this information. How are you going to do that? In the Primary, Secondary, Advanced columns, sort these concepts correctly Optional, not usually done Settles large particles Filters large particles which go to a landfill Removes pollutants like nitrates and phosphates Removes bacteria with chlorine or ultraviolet light Adds O2 to promote bacterial growth Uses a 2nd filter Bacteria added to decompose waste Now that you have the gist, show me that you know this very well. Which means: › You can clearly represent the steps to me › In a different context › It will be creative and help your classmates (or other classes) learn › It will answer one of our original questions •How long does the treatment process take? •Is the sludge safe for the water after purification? •Is there a way to fully clean water (as good as it was before)? •How does a water tower work? •Where does the stuff go that is filtered out? •What chemicals are used in purification? •Are we doing more harm putting chemicals in the water than treating the waste? •Where does a fish go when you flush it? •Where does the process start? •If you flush a live fish down the toilet will it survive? •What happens to the waste/poop? •How long does the process take? •Is natural filtration as good as a treatment plant? •Where is our wastewater treatment plant? •Why don’t we use salt water from the ocean? Is it a possibility? •Is finding Nemo accurate? •Why is tap water in other countries unsafe to drink? •What happens to toilet paper? •After filtering where does all the pollution/bacteria they take out go? •Why is water put into a water tower? •How long is the process from toilet to tap? •What filters produce cleaner water natural or manmade? •Why is water from the faucet sometimes white? •Is finding Nemo accurate? •Where does garbage disposal stuff end up? Toilet Sink Washing Machine Dishwasher Your house, a laboratory, an industrial factory, etc… PHYSICAL Filtering large particles goes to landfill Settle large particles on to secondary removes ~60% of suspended solids from wastewater. BIOLOGICAL Bacterial growth promoted, then killed › Aeration encourages bacterial growth puts O2 back into water › Bacteria decompose waste – yum! › Bacteria are killed via chlorine (usually) Removes >90 percent of suspended solids. CHEMICAL & PHYSICAL “optional” (not done conventionally) Reduce pollutants of “special concern” › Nutrients like Nitrates and Phosphates…why? Uses coagulating chemicals & a 2nd filter WATER Into a lake or river ocean Crops/Golf course Possible problems? SLUDGE Lagoon Incinerator Crop fertilizer Possible problems? Wastewater Treatment Recap Beauty Products Medicine Engine Oil Paint Lawn Care Products Prescription Drugs Photographic Chemicals Used Cooking Oil Fat from cooking Bacon Diapers Condoms Wastewater tx plants will always be in the basin of a watershed…why? http://www.youtube.com/watch?v=Q7b Vx8FBx5s&feature=related Start at 20sec Wastewater Treatment Recap Recycles wastewater to drinking water Video clip (1:52) Wastewater Treatment Recap Recycles wastewater to drinking water Video clip 2. 1. 3. 4. 6. 5. Purification depends on $$$ Boiling Using Sun’s Rays to disinfect Lifestraw Purification plants Toilet to Tap How’s this linked to… Life expectancies? Natural Disasters? Hiking? What do you normally drink? Why? What do you know about bottled water? Show the differences and similarities between drinking water and wastewater treatment. •How long does the treatment process take? •Is the sludge safe for the water after purification? •Is there a way to fully clean water (as good as it was before)? •How does a water tower work? •Where does the stuff go that is filtered out? •What chemicals are used in purification? •Are we doing more harm putting chemicals in the water than treating the waste? •Where does a fish go when you flush it? •Where does the process start? •If you flush a live fish down the toilet will it survive? •What happens to the waste/poop? •How long does the process take? •Is natural filtration as good as a treatment plant? •Where is our wastewater treatment plant? •Why don’t we use salt water from the ocean? Is it a possibility? •Is finding Nemo accurate? •Why is tap water in other countries unsafe to drink? •What happens to toilet paper? •After filtering where does all the pollution/bacteria they take out go? •Why is water put into a water tower? •How long is the process from toilet to tap? •What filters produce cleaner water natural or manmade? •Why is water from the faucet sometimes white? •Is finding Nemo accurate? •Where does garbage disposal stuff end up? Fill in more items in the “L” column of your KWL Wastewater from city Grit Filters (to remove large matter) Sedimentation tank Trickling filter To stream Tertiary treatment Secondary filters Aeration Water from rivers / lakes Primary Filters (to remove large matter) Flocculation tank Sedimentation tank To tanks in the city Chlorination Rapid / slow sand filtration What does it include? › Brainstorm a list of 5 contents Where does it come from? › Brainstorm a list of 5 sources Why should humans care? Why are we concerned about water usage if the law of conservation of matter is true? Disease-causing pathogens can destroy food chains Organisms die….leading to low oxygen levels via decomposers › May be due to increased algal growth or more directly via toxic kills Chlorine compounds and inorganic chloramines can be toxic to aquatic invertebrates, algae and fish; Bioaccumulation › Metals, such as mercury, lead, cadmium, chromium and arsenic can build up a food chain Pharmaceutical and personal care products may cause unknown effects… http://ga.water.usgs.gov/edu/wwvisit.ht ml Stages of treatment, purpose of a treatment plant