Water Treatment Wastewater Treatment

Water Treatment Wastewater Treatment

Water Treatm ent Plants Removes

pathogens and toxic elements to prepare water for use in homes and businesses Makes water

potable (drinkable) Steps for water treatment 1. Screen/filtration source water is filtered to remove large organisms and trash (usually with screens)

2. Coagulation/flocculation Alum or a ferric (iron) based compound is rapidly mixed in and forms sticky globs called flocs. Bacteria and other impurities stick to the flocs.

Over time the weight of the flocs increase and settle to the bottom of the basin 3. Sedimentation 4. Filtration layers of sand,

gravel and coal filter remaining impurities 5. Disinfection add disinfectant (usually chlorine or ozone) to prevent bacterial growth

Chlorine can form harmful byproducts (THMs)and has suspected links to stomach cancer and miscarriages. Many agencies now residually disinfect with Chloramine (chlorine/ammonia combo) to prevent formation of THMs.

Additional treatments fluoride (dental health) lime (softens hard water) aeration (add O2) removes

odors to improve taste pH adjustment Municipal Water Purification Plant Wastewater (Sewage) Treatment

Septic Tanks: typically treat small volumes of waste (e.g., from a single household, small commercial/industral) WasteWater Treatment Plants(WWTP) : typically treat larger volumes of municipal or industrial waste.

Septic Tanks Approx. 22 million systems in operation ( 30% of US population) Suitability determined by soil type, depth to water table, depth to bedrock and topography Commonly fail due to poor soil drainage

Potential contaminants: bacteria, heavy metals, nutrients, synthetic organic chemicals (e.g. benzene) WasteWater Treatment Plants

Sources Domestic used water and toilet wastes Rainwater Industrial effluent (Toxic industrial water is pretreated)

Livestock wastes Steps for wastewater treatment Divided into three stages of treatment

Primary Treatment physical process Secondary Treatment biological process Tertiary (advanced) Treatment can be chemical or physical; expensive and rarely done; targets specific pollutants; varies based on needs of the community

Primary Treatment 1. Filtration uses bar screens and grit chambers to filter out larger debris Grit chamber

2. 1st settling tank (primary clarifier) sewage sits to let smaller particles settle to bottom. Debris that settle to the bottom forms sewage sludge. Large arm skims the top to collect floating debris (grease/oil).

*this process takes several hours* Secondary Treatment 3. Aeration basin (tank) activated sludge which includes microorganisms (bacteria and protozoans) and O2 are added to feed on organic

waste 4. 2nd settling tank (secondary clarifier) bacteria and remaining solid waste slowly settle to the bottom of the tank. Debris that settle to the bottom forms activated sludge.

Samples are taken from the activated sludge and analyzed in the lab. If it is still usable it is recycled to the aeration

basin. 5. Disinfection uses ozone, UV light or chlorine to kill any remaining bacteria All sludge ends up in an anaerobic digester where

it is heated and dried Biosolids High in NO3 & PO4 (unless removed by tertiary treatment)

Biosolids are sent to one of three places: Landfill Incinerator Agricultural fields used as compost/fertilizer (most common practice)

Recently Viewed Presentations

  • Child With Cardiovascular Dysfunction

    Child With Cardiovascular Dysfunction

    CHILD WITH CARDIOVASCULAR DYSFUNCTION KAREN E. MILES FLORIDA GULF COAST UNIVERSITY DEPARTMENT OF NURSING CONGENITAL HEART DEFECTS INCIDENCE 1-2% of all live births Increases to 3% if have another child with CHD 4-10 in 1000 live births ETIOLOGY Multifactorial Inheritance...
  • First Grade Homework & Classroom News:August 21 -

    First Grade Homework & Classroom News:August 21 -

    Counting handfuls of items (cereal, pennies, paper clips) Add together two groups of items to find sums (4 cheerios plus 3 cheerios gives us 7 cheerios) Practice writing numbers from 1-120. August 21st- 25th. STEM focus and Words of the...
  • SOCIAL STUDIES - Jefferson County Public Schools

    SOCIAL STUDIES - Jefferson County Public Schools

    SOCIAL STUDIES CHAPTER 3 LESSON 1 GROWTH OF SLAVERY RESISTANCE TO SLAVERY THE SOUTH'S ECONOMY THE NORTH'S ECONOMY THE TARIFF The different economies led to disagreements between the regions about tariffs - a tax on goods Congress passed high tariffs...
  • Introduction - cs.uh.edu

    Introduction - cs.uh.edu

    Darwinian Evolution:Summary Population consists of diverse set of individuals Combinations of traits that are better adapted tend to increase representation in population Individuals are "units of selection" Variations occur through random changes yielding constant source of diversity, coupled with selection...
  • The Analytical Literary Essay

    The Analytical Literary Essay

    Thesis statement. Tips for the Broad Opening Statement. Look at your thesis for inspiration. Pull one or two key words and focus on those. For example, if your thesis is about whether Odysseus is a strong leader, then focus your...
  • Ozone/CFCs

    Ozone/CFCs

    Ms. Simon's Father. Standard Model Related Nobel Prizes. 1976 Richter (Stanford Linear Accelerator Lab), Ting (MIT) for their pioneering work in the discovery of a heavy elementary particle of a new kind. Standard Model Related Nobel Prizes.
  • University of Dallas 2003

    University of Dallas 2003

    University of Dallas 2003 Katie Mechler University of Dallas Campus Braniff Building Home of the Education Department Foundation of the University Dante Dallas Area Network for Teaching and Education Barbara Khirallah, Director Offering Vygotsky- style assistance to teachers Technology in...
  • Creation

    Creation

    Teacher Notes Page 1. Cover: God Created the World (Genesis 1:1 through 2:3) 2. Did you know that a long, long time ago there was nothing? No trees, no people, no buildings, not even sound or smell? Darkness was everywhere....