COURSE # 343 UNIT # 2: ADVANTEX® WASTEWATER

Transcription

COURSE # 343 UNIT # 2: ADVANTEX® WASTEWATER TREATMENT SYSTEM
Components
What you will learn in this lesson
IN THIS LESSON,YOU WILL LEARN...
•
The difference in unit processes for a traditional on-lot wastewater treatment system compared to the
AdvanTex Treatment System
•
AdvanTex Treatment System components
•
What is nitrification and where does it take place in the AdvanTex Treatment System
•
The optimum conditions for nitrification
•
What is denitrification and where does it take place in the AdvanTex Treatment System
© ORENCO SYSTEMS®, INC. 10/24/2012 ALL RIGHTS RESERVED
UNIT-2 -1
Components
Unit Processes in a Traditional Septic Tank and Soil Absorption System
The septic tank provides primary treatment in the form of grit removal, primary sedimentation, scum retention,
and anaerobic digestion. This is followed by the soil dispersal system, which provides aeration and disinfection if
the soil and site conditions are acceptable.
In many cases, the native soil is incapable of providing adequate treatment and dispersal. In some cases, treatment
is required beyond the native soil’s capacity.
UNIT-2 -2
Components
Unit Processes With the AdvanTex Treatment System Following the
Septic Tank
With an AdvanTex Treatment System, the septic tank still provides primary treatment in the form of grit removal,
primary sedimentation, scum retention, and anaerobic digestion. The AdvanTex unit or “soil substitute” provides
aeration and treatment to advanced standards. This is then followed by the dispersal system where polishing and
disinfection may occur.
The AdvanTex Treatment System provides measurable, manageable advanced treatment that some soil and site
conditions can not. The active biomat in the AdvanTex Treatment System is accessible so it can be monitored and
managed. Other systems bury the biomat where it cannot be monitored or managed.
UNIT-2 -3
Components
The System
An AdvanTex Treatment System contains four major components: The 2-compartment processing tank, the
AdvanTex AX20N filter pod, the pumping and control system, and the recirculating splitter valve. Wastewater flows from
the home or building into the inlet of the processing tank. It is then pumped out of the second compartment via a Biotube
Pump Vault into the AdvanTex pod, where it is further treated and then discharged into the soil dispersal system. The
recirculating splitter valve allows a portion of the filtrate to return to the processing tank for recirculation.
UNIT-2 -4
Components
The System
An AdvanTex RT Treatment System contains four major components: The septic tank, recirculation tank, the
AdvanTex filter, and the pumping and control system. Wastewater flows from the home or building into the inlet of the
septic tank. It then flows out of the septic tnk through an effluent filter into the recirculation tank, where it is dosed to the
AdvanTex filter, treated and then discharged into the soil dispersal system. The recirculating return valve allows a portion
of the filtrate to return to the processing tank for recirculation. Thus allowing a 4:1 recirculation ratio.
UNIT-2 -5
Components
Filter Type AX20N
•
Physical specifications
✔ 7.5’ x 3’ x 2.5’
✔ Footprint: 23 sq. ft.
✔ Dry weight: 300 lb.
•
The heart of the residential AdvanTex Treatment
System is the textile filter pod. This is where the
wastewater is biochemically processed and filtered
to a high-quality effluent.
•
The AdvanTex Treatment System uses the
same naturally-occurring micro-organisms that are
found in suitable soil. No special microbes or
additives are required.
UNIT-2 -6
Components
AX Series
•
Uses hanging textile sheets
•
Can withstand occasional abnormally high loading
conditions
•
Has outstanding serviceability
• The textile in the hanging sheets has been specifically
engineered to provide optimum characteristics for
wastewater treatment. Properties include:
✔ High porosity
✔ High hydraulic conductivity
✔ High water-holding capacity
•
These are the same properties desired in an excellent
soil for treating wastewater
UNIT-2 -7
Components
AdvanTex Overview - Main Components
• Control System
• Processing Tank
• Pump Package
• AdvanTex filter with vent
• Recirculating splitter vavle
Each of these components is discussed
in detail on the following pages.
UNIT-2 -8
Components
AdvanTex Overview - #1 Control Panel
The control panel sends signals to the pump to
deliver liquid from the processing tank to the
AdvanTex filter pod.
Wastewater is applied in small, frequent doses,
maintaining aerobic, unsaturated conditions in the
textile media. The doses are timed so that the media
and attached microbes receive equal doses at equal
intervals all through the day.
The timers in the panel also control the 4:1
recirculation to dispersal ratio.
The control panel includes the necessary required
local audio/visual alarms.
UNIT-2 -9
Components
The Control Panel
•
Use a licensed electrician for wiring the following:
✔ Make all float connections from the vault to the panel
✔ Be sure that incoming power is connected to the panel
✔ Connect power from the panel to the recirculation pump
✔ Connect power to the discharge pump, if applicable
✔ Use a conduit seal outside the riser
Note:
Do not install the control panel
against the house.
Use a 4” x 4” post.
UNIT-2 -10
Components
AdvanTex Overview - #2 Processing Tank
The processing tank receives raw wastewater from
the home, as well as filtered effluent from the
AdvanTex media filter.
Since the AdvanTex Treatment System is a
recirculating media filter system, the household
sewage is diluted in the processing tank as it is
blended with treated effluent. This allows a much
higher loading rate onto the media as compared to
single-pass systems such as sand beds.
UNIT-2 -11
Components
Two-Compartment Processing Tank
•
There is a minimum 12-square-inch pass-through
port in the baffle wall
•
The port center is located at 65 to 75% of the
minimum liquid level
•
All tank designs must be structurally sound and
watertight
•
All tank designs must be approved by Orenco and
authorized by an Orenco Dealer
UNIT-2 -12
Components
AdvanTex Overview - #3 Biotube® Pump Package
The Biotube pump package includes the vault, the
Biotube effluent filter, the high-head pump, the
discharge assembly and the float tree with floats.
The liquid in the processing tank flows through the
large openings in the vault and through the 1/8-inch
mesh of the Biotube effluent filter.
The screened effluent is pumped to the AdvanTex pod
using the high-head pump.
The Biotube effluent filter prevents particles larger
than 1/8-inch from entering the pump. This allows the
use of a high-head pump in the AdvanTex Treatment
System.
The pump is the only moving part in the AdvanTex
Treatment System.
UNIT-2 -13
Components
AdvanTex Overview - #3 Biotube® Pump Package, continued:
The liquid level floats signal the control panel that
sufficient liquid is in the processing tank for the pump
to operate. Also, there is a high-water alarm float as
well as a low-water alarm float.
The high-water float signals the control panel to alert
the service provider that there is a high water level in
the tank.
The low water alarm also has the capability of alerting
the service provider to turn off the pump to prevent it
from running dry.
UNIT-2 -14
Components
Biotube® Pump Package
•
Refer to “Appendix 3: RSV and Float Level
Diagram in the AdvanTex Installation Manual,
AdvanTex AX20N Treatment Systems, Document
NIM-ATX-AX-1, Orenco Systems, Inc.
www.orenco.com/pennsylvania
•
Verify the float elevations
•
Snap in the float bracket
•
Install the cartridge
UNIT-2 -15
Components
AdvanTex Overview - #4 AdvanTex Filter with Vent
The AdvanTex filter with vent is a media filter made of a
textile engineered to have high porosity and high hydraulic
conductivity, yet high water-holding capacity.
The liquid from the processing tank is pumped to the
pressurized distribution system over the textile media
surface. As the liquid percolates downward through the
media, the microbes attach to the textile and use the
wastewater contaminants as a food source.
Using oxygen for aerobic respiration, the microbes
convert organic carbon to carbon dioxide and water, and
ammonium-nitrogen to nitrate-nitrogen.
The treated filtered water from the AdvanTex media
flows from the bottom of the fiberglass pod to the
recirculation ball valve, where the liquid flows back into
the processing tank or to the soil dispersal system, IRSIS
or surface discharge.
UNIT-2 -16
Components
AdvanTex Overview - #5 Recirculating Splitter Valve
The Recirculating Splitter Valve (RSV) allows treated,
filtered effluent from the AdvanTex media filter to flow
from the pod back into the processing tank or to the
dispersal area.
When the ball valve is seated in the RSV, the filtered
effluent is directed toward the dispersal system - soil
absorption, IRSIS, or discharge.
When the ball is unseated, the filtered effluent returns to
the processing tank, diluting the incoming septic tank
effluent, and recirculating through the AdvanTex media
filter.
The functions of the RSV and the timers combine to
maintain the recirculation ratio. The normal recirculation
ratio is approximately 4:1.
UNIT-2 -17
Components
RSV Bracket Installation
• Carefully lower the RSV body into the bracket
• Push down until it is fully seated
UNIT-2 -18
Components
Flow Path Through an AdvanTex Treatment System
Liquid Recirculates through 2nd chamber: Filtrate discharges
UNIT-2 -19
Components
Design: Fully Assembled or Assembled Onsite
The AdvanTex Treatment System can be delivered either fully assembled or it can be assembled onsite. A fully
assembled package consists of an Orenco fiberglass reinforced plastic tank (FRP) processing tank, AdvanTex
AX20N pod, and pumps and controls. The fully assembled package will come with risers attached, floats set, RSV
set, and the AX20N pod anchored to the top of the tank. If you choose to assemble onsite, you will need to set
the floats and RSV and install the AX20N pod.
UNIT-2 -20
Components
Why only Orenco FRP or approved concrete tanks
•
Tanks can crush or break if they are not structurally sound
•
Tanks can leak in or out if they are not watertight
•
Poor tank quality can destroy an entire wastewater system
Collapsed polyethylene septic tank
Collapsed concrete spetic tank with inadequate reinforcing steel
UNIT-2 -21
Components
The Orenco AdvanTex Components Enable the Treatment System to
Reduce Total Nitrogen
Nitrogen Removal Requires Two Processes
•
Nitrification - Conversion of Ammonium to Nitrate through a two-step aerobic process in
the AdvanTex filter pod.
Nitrosomonas
•
Step 1:
NH4+
+
3/2O2

NO2-
Step 2:
NO2-
+
1/2O2

NO3-
+
2H+
+
H2O
Denitrification - Conversion of Nitrate to nitrogen gas through an anaerobic process in the
processing tank and the septic tank.
Heterotrophic Bacteria
NO3-
+ Organic matter

N2
+
CO2
+
OH- + H2O
UNIT-2 -22
Components
For Optimum Nitrogen Transformation (Nitrification) to Occur the Following
Conditions are Required
•
Adequate alkalinity - Depending upon the influent nitrogen concentration and species
•
7.14 mg alkalinity as CaCO3 for every mg NH4-N (ammonium-nitrogen) to be nitrified
•
pH of 6 to 8
•
4.33 mg O2 (molecular oxygen) for every mg NH4-N (ammonium-nitrogen) to be nitrified
•
Filtrate DO (dissolved oxygen) concentration of 2.5 to 6 mg/L
•
Influent ammonia concentration of 60 mg/L
•
Influent TN (total nitrogen) concentration below 65 mg/L
•
Adequate time for nitrifying bacteria to develop
•
Adequate temperature
UNIT-2 -23
Components
Packed Bed Filter Biofilms
•
At the surface and within the top 6+ inches, organic and inorganic matter is
trapped and the greatest biofilm accumulation occurs.
•
The top zone is mostly responsible for solids and organic reduction. In this
nutrient rich upper zone, most of the organic matter is trapped, decomposed,
and digested.
•
Heterotrophic bacteria are primarily responsible for reducing the organic
matter concentration.
•
After the carbonaceous demand is met in the upper levels of the media,
autotrophic bacteria reduce inorganic constituents (such as ammonium)
through nitrification (the conversion of ammonium to nitrate) in the lower
region of the media.
Filter depth for BOD
removal and Nitrification
UNIT-2 -24
Components
Signs of Effective Nitrogen Transformation (Nitrification)
•
Clear, odorless effluent
•
Normal-looking biomat
•
Low CBOD5 and high clarity
•
DO of 2.5 to 6 mg/L
✔ Odorless or odor that is not a nuisance
•
Relatively low ammonium levels (NH4-N)
•
Relatively high nitrate levels (NO3-N)
UNIT-2 -25
Components
Denitrification requires
•
Nitrogen in the form of Nitrate-N
•
Anoxic conditions to promote anaerobic metabolism
•
Adequate carbon for microbial metabolism
By recirculating nitrified filtrate to the processing tank, denitrification occurs in
the carbon-rich, anaerobic processes within the processing tank environment
UNIT-2 -26
Components
Lesson Summary
IN THIS LESSON,YOU LEARNED ...
•
The difference in unit processes for traditional on-lot systems compared to the AdvanTex Treatment System
•
AdvanTex Treatment System components
•
What is nitrification and where does it take place in the AdvanTex Treatment System
•
The optimum conditions for nitrification
•
What is denitrification and where does it take place in the AdvanTex Treatment System
UNIT-2 -27

COURSE # 343 UNIT # 2: ADVANTEX® WASTEWATER

Transcription

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