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Practitioner's Tool / Secondary Treatment Methods

2,893 bytes added, 23:56, 7 October 2016
Created page with "{| cellspacing="0" cellpadding="10" border="1" style="width: 100%" |- | '''Secondary Treatment'''<br/> | '''Appropriate Use'''<br/> | '''Relative Cost'''<br/> | '''Operation..."
{| cellspacing="0" cellpadding="10" border="1" style="width: 100%"
|-
| '''Secondary Treatment'''<br/>
|
'''Appropriate Use'''<br/>

| '''Relative Cost'''<br/>
| '''Operations and Maintenance'''<br/>
| '''Effectiveness'''<br/>
|-
| style="text-align: center; vertical-align: middle" |
[[File:Construc.jpg|thumb|right|100px|link=Constructed Wetlands]]<br/>

[[Constructed_Wetlands|Constructed Wetlands]]

| For septic tank or primary treated effluent. Sites with no power, where land is plentiful. Useful where soils are shallow, unlike lagoons that require greater depth<br/>
| Moderate - The media, typically crushed stone and liner material are significant cost items<br/>
|
Low - Periodic plant weeding and plant maintenance required

| High - Can be highly effective and will produce discharge quality effluent when sized properly<br/>
|-
| style="text-align: center; vertical-align: middle" |
[[File:Cocopeat1.jpg|thumb|right|100px|link=Cocopeat Filters]]<br/>

[[Cocopeat_Filters|Cocopeat Filters]]

| Cocopeat, sand and gravel can be used as filtration media for secondary treatment. Used as intermittent flow or recirculating filters. Use these systems where local materials are available<br/>
|
Low - When locally available materials can be used for the filter media

|
Low - For cocopeat systems, will require raking of the surface every few months and replacement of the media every 2 to 3 years

| High - Can be highly effective and reduces biochemical oxygen demands and total suspended solids<br/>
|-
| style="text-align: center; vertical-align: middle" |
[[File:Oxidationditch.png|thumb|right|100px|link=Technology]]<br/>

[[Technology|Aerobic Systems]]

| For sites where power is available and land area for wastewater is limited and expensive
| Variable – Cost per cubic meter of treatment drops as size of the systems increase. For very large systems, the cost per cubic meter treated can be very low
| High – Requires specific knowledge of process control, instrumentation and electronics
| Variable to High - Can be custom designed for a wide variety of wastewater strengths and variability
|-
| [[File:RBC.png|thumb|right|100px|link=Rotating Biological Contactors]]
[[Rotating_Biological_Contactors|Rotating Biological Contactors]]

| Requires electricity. Generally used for small to medium-sized residential or commercial sources. Useful when land area for wastewater treatment is limited
| High - Manufactured and electrical components generally not locally available except in largest municipal centers
|
Moderate - Lubrication of shaft and removal of biosolids required periodically. Electrical components must be checked frequently for corrosion

| High - When sized properly, can remove high percentage of pollution in wastewater. Requires generator to keep system operational during power outages<br/>
|}

''[[Technology|Back to Technology Page]]''
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