Aerators And Aerobic
Digestion
Aerators Enhance Aerobic Digestion
Process
By
Larry Moore; Charles Van Zandt
The city of Eden, N.C.,
operates an extended aeration process designed for an average flow rate of 13.5
mgd with a mixed liquor suspended solids concentration that typically checks in
about 6,000 mg/l.
This
high biomass concentration is necessary to provide a well-settling sludge and
good effluent quality.
Further, the plant influent
is approximately 40% domestic wastewater and 60% industrial wastewater.
The industrial component is
dominated by textile facilities.
The Eden Wastewater Treatment
Plant (WWTP) generates about 20,000 lb per day of waste activated sludge
solids, which are aerobically digested prior to storage in sludge lagoons and
ultimate land application.
For
many years, the facility has had difficulty maintaining adequate dissolved
oxygen levels and adequate mixing in its aerobic digester.
However, this all changed
when the plant installed four new floating brush rotor aerators in May 2004.
Aerators Enhance
Aerobic digestion is a sludge stabilization process designed to convert waste activated sludge solids to carbon dioxide, water, residual cell debris and other end products.
Aerobic digestion is a sludge stabilization process designed to convert waste activated sludge solids to carbon dioxide, water, residual cell debris and other end products.
The
oxidation of cellular material is referred to as endogenous respiration and is
typically the dominant reaction in aerobic digestion.
The detention time in the
digester is normally about 20 days to achieve satisfactory solids
stabilization.
Additionally,
the primary functions of an aerobic digester are to reduce odors, reduce
biodegradable solids content, to prepare the sludge for ultimate disposal on
land consistent with Federal 503 regulations.
Aerobic digestion stabilizes
the sludge solids more rapidly than anaerobic digestion, even though a less
complete breakdown of cells is typically achieved.
Oxygen can be supplied by
mechanical aerators or by diffused aeration.
At
the Eden WWTP, vertical surface aerators have been used for many years. Plant
personnel have had serious concerns because of operating problems as well as
poor process performance.
Prior to installation of the
new floating brush rotor aerators, the plant had 145-hp of vertical aeration
equipment in the aerobic digester.
The vertical aeration
equipment consisted of three 40-hp units and one 25-hp unit.
In
aerobic digestion, it is desirable to maintain at least 1.0 mg/l dissolved
oxygen level to provide an efficient aerobic environment.
Typical dissolved oxygen
concentrations were 0.0 mg/l, which led to odor problems and poor aerobic
digester performance.
In
addition, it is extremely important to provide adequate mixing to keep the
waste solids in suspension.
Typically, one-third of the
aerobic digester was never mixed, creating dead zones detrimental to aerobic
digestion.
Moreover, it usually required
two to three days of settling to facilitate efficient decanting of supernatant
prior to wasting sludge to the sludge storage lagoons.
Consequently, the aerobic
digestion process performed below expectations and created operating problems
for the WWTP staff.
https://www.wateronline.com/doc/aerators-enhance-aerobic-digestion-process-0001
AERATION
Biological Oxygen
Demand and Chemical
Thermal
ADVANCED OXIDATION Waste Water Treatment
You might also like:
AERATION
CLICK HERE . . .
Biological Oxygen
Demand and Chemical
Oxygen Demand
CLICK HERE . . .
.
Thermal
Hydrolysis
CLICK HERE . . .
Ozonation in
Water Treatment
CLICK HERE . . .
ADVANCED OXIDATION Waste Water Treatment
System
simulates
nature’s way of processing waste water
CLICK HERE . . .
http://puricare.blogspot.com/2016/06/advanced-oxidation-waste-water_19.html
.............
Need a septic tank for your home / office?
.............
Need a septic tank for your home / office?
Save time, space and labor cost with the
BESTANK FILTERING SEPTIC TANK
It saves labor cost, space and time as compared to traditional concrete septic tanks. You will only need a 2M X 1.5M space and you can finish installing it in half a day.
The Filtering Septic Tank Advantage:
1 - Environment-Friendly
2 - Guaranteed to Last
3 - Easy to Install
4 - Labor & Time-Saving
5 - Cheap & Affordable
2 - Guaranteed to Last
3 - Easy to Install
4 - Labor & Time-Saving
5 - Cheap & Affordable
Environment friendly, made with 100% recycled materials
Easy "dig & Shoot" Installation
Three stage design complies with industry standards (anaerobic digestive, filtering and anaerobic culturing
Durable and reusable
Easy "dig & Shoot" Installation
Three stage design complies with industry standards (anaerobic digestive, filtering and anaerobic culturing
Durable and reusable
Installation:
1. Dig a hole 2m deep, 15m diameter.
1. Dig a hole 2m deep, 15m diameter.
2. Level the ground by spreading 10cm/4in of compacted sand at the bottom of the pit.
3. Lower Bestank Purifying Septic Tank, ensure that manhole cover is 7cm above natural grade line or at least level to suit the required elevation of the inlet / outlet pipes.
4. Connect the inlet pipe to the toilet's outlet.
5. Fill the space surrounding the tank with soil, sand and gravel.
5. Fill the space surrounding the tank with soil, sand and gravel.
6. Make sure that the tank is half-filled with water to prevent possible floating due to hydraulic pressure introduced by presence of groundwater.
7. Finish with cement.
Specifications:👉 Capacity: 7 persons👉 Height: 1.485M👉 Diameter: 1.1.1M👉 Volume: 1.10 cbm👉 Weight: 80kg👉 Material: Recycled PE👉 Color: Black
-------------------------
-------------------------
Contact us at
📱0949-838-8218
📱0933-875-4415
📱0905-752-4336📞 (033)5196057
📱0949-838-8218
📱0933-875-4415
📱0905-752-4336📞 (033)5196057
Our store is located at
Vice President Fernando Lopez Avenue, Aganan, Pavia, Iloilo (in front of 7/11 Convenience Store)
Vice President Fernando Lopez Avenue, Aganan, Pavia, Iloilo (in front of 7/11 Convenience Store)
-------------------------
We also install, sell and offer the following services:
- WATER TREATMENT SYSTEMS: Residential, Commercial, Industrial
- WASTE WATER TREATMENT SYSTEM
- WATER PUMPS, CONTROLLERS, SENSORS
- DEEP WELL DRILLING
- STORAGE TANKS: Stainless Steel, Polyethylene, Bestank, Firstank, Weida
- PRESSURE TANKS - Bladder- Diaphragm
- uPVC PIPES & FITTINGS: Blue, Sanitary, Electrical
- BI PIPES & FITTINGS: Megafusion, Belden, Lamco
- FIREFLY, ROYU, SASSIN LIGHTING & ELECTRICAL COMPONENTS
...........
 |
Multi-Media Filter, Highly-Activated Carbon Filter,
Zeolite-Process Water Softener With Brine Tank,
Fiberglass Ballast-Type Pressure Tank
(fully automatic backwash & regeneration)
|
PURICARE
Water
Treatment
Systems.
.
...Aganan, Pavia, Iloilo, Philippines...
No comments:
Post a Comment