HARSB removes residential and non-residential pollution EVERY DAY !!
-- On the Average, each person in the U.S. contributes 50-100 gallons of wastewater each day.
If we don't remove pollution the river and aquifer become polluted and quality of life in the valley
-- A Wastewater Treatment plant removed solids: This includes everything from rags, sticks, rocks, sand, etc. found in wastewater
-- A Wastewater Treatment plant reduces organic matter and pollutants: Helpful bacteria and other microorganisms are used to consume organic
matter in wastewater. The bacteria and microorganisms are then separated from the water
-- A Wastewater Treatment plant restore oxygen: Treatment facilities help ensure that the water put back into our lakes or rivers has enough
oxygen to support life.
Note: While our lakes and streams clean water in much the same way, wastewater treatment plants are faster and can handle more water. This makes
treatment plants essential in areas where there's too much wastewater for nature to handle alone.
Let Us Start a Basic Tour of the HARSB Facility:
The headwork's receives influent from the City of Hayden, Hayden Lake Recreational Water and Sewer District, and Kootenai County Airport.
Inside the Headworks is the Step Screen and Grit System.
The Step Screen removes materials that should not be in the system. The material that is removed is sent to the Landfill.
Equalization Tank and Biological Nutrient Flow Control
The Flow Control Valve is set for a daily flow rate and is measured by a flow
meter. The set flow rate is at 1 million gallons per day to the biological
Excess flows above 1 million gallons per day in the morning flows into the equalization tank. In the afternoon and the middle of the night when water flow rates
drop below 1 million gallons per day, water is pumped from the equalization tank to maintain the constant flow and organic load to the biological process.
Anaerobic Tanks and Anoxic Tanks
Anaerobic tanks have ZERO "No" dissolved oxygen. The Bacteria "Bugs"
desperate for oxygen break down the Phosphate (PO4) releasing the phosphorus and
Surface aerators provide high oxygen aerobic conditions. Bacteria eat organics, consuming oxygen (02), and make more bacteria (solids) "Eating and Reproducing"
This clarifier is a quiet place for microogranisms and solids to form clumps and settle. It has a mechanism that collects the solids so they can be returned/recycled back to the Anaerobic tank to start the process over.
Waste Sludge Holding Tank
The solids are removed from the Clarifier and placed in the holding
tank. Air is pumped into the tank to maintain high dissolved oxygen
condition to keep the solids
fresh and easier to dewater.
Chlorine gas is added to water to make a strong chlorine solution. Chlorine kills disease causing organisms. Water is then recycled to the Spokane River during winter months
or to the Reuse Farm during the growing season.
Fact: "Chlorine Disinfection is credited for the large increase in world population growth in the 20th Century because it kills disease causing organisms."
Screw Press (DeWatering)Polymer is added to make the solids stick together and release water. The press squeezes the water from the solids making dryer biosolids (cake). Biosolids meet EPA
On site testing to control the biological process and monitor the water to insure it meets water quality requirements.