Resources
Site Search

Saving the environment one Geotube at a time.

Call: 

Randy Hart at 281-353-2568

 

 

 
Frequently Asked Questions

 

1) How long will it take before the sludge is dry enough to haul off?
2) How do I determine how many Geotube containers I need for my plant or my project?
3) What happens if I fill the Geotube container higher than the design height?
4) Can I dewater municipal wastewater treatment biosolids without using polymer?
5) Can Geotube technology dewater and contain secondary sludge?
6) Can Geotube technology dewater and contain primary sludge?
7) What is the main reason to use Geotube technology?
8) Can Geotube containers contain contaminated material such as PCBs?
9) How do I find out if Geotube containers s are right for our needs?
10) Can Geotube dewater and contain Alum sludge?
11) Can Geotube containers dewater and contain fly ash?
 


 

1) How long will it take before the sludge is dry enough to haul off?

There are several factors that influence the time it takes to sufficiently dewater sludge:
1. Chemical conditioning is the key to optimum dewatering. Working with a polymer supplier, bench tests are conducted to determine the best polymer for dewatering the sludge. Once the product is chosen, the dose is determined. Overdosing the polymer can cause the sludge to “hold onto” the water rather than releasing it and may result in blinding off the Geotube geotextile. Properly mixing the polymer into the sludge is also important. The polymer should be made down into a lower percentage solution and ideally, aged for 30 minutes before injecting it into the sludge line. Equally important is to provide enough mixing in-line to assure that the polymer attaches to the sludge particles to create a floc and allow the free water to flow out of the Geotube containers.
2. Type of sludge or age of sludge can influence how fast it will dewater. Well digested sludge will dewater more quickly than raw sludge. As process water sludge will dry faster than biosolids.
3. The longer a client can allow the sludge to remain on site and dry after the final filling cycle, the drier the solids will become and the greater volume reduction will be achieved.


top


2) How do I determine how many Geotube  containers I need for my plant or my project?

First we gather the following information:
1) Volume of sludge or flow rate of residuals to be dewatered.
2) Specific gravity of the solids.
3) In situ percent solids.
4) Percent solids during dredging or pumping.
5) Target percent solids after dewatering.
6) Production rates, GPM, hours per day and efficiency of pumping or dredging.
7) We begin by doing bench tests to determine the appropriate chemical conditioning. Tests are then conducted to determine volume reduction and target cake solids after dewatering with Geotube containers. The tests may be a Rapid Dewatering Test (RDT), a hanging bag test, a full-scale test or a combination of two or more of these tests. Samples of dewatered sludge are taken at intervals and dried to determine percent solids by weight.
8) This information is put into a spreadsheet designed to determine the linear footage of various circumference Geotube containers required to accommodate the volume of sludge.


top


3) What happens if I fill the Geotube  container higher than the design height?

Geotube  container design height is controlled by the tensile strength of the textile with a 4:1 factor of safety. Exceeding the design height could result in the textile rupturing.


top


4) Can I dewater municipal wastewater treatment biosolids without using polymer?

Yes, but the capture of solids won’t be as efficient and it will take much longer to get sufficiently dry cake solids. There is also a risk of masking off the pores of the textile. We recommend the use of polymer on most sludges.


top


5) Can Geotube technology dewater and contain secondary sludge?

Yes, It will probably require a polymer to assist in flocculation. This will result in very clean filtrate and solids comparable to older mechanical dewatering technology.


top


6) Can Geotube technology dewater and contain primary sludge?

Yes, most installations use a polymer to assist in dewatering allowing faster refilling and obtaining finished solids sooner. Solids levels are usually equal or higher than the traditional older mechanical methods.


top

7) What is the main reason to use Geotube technology?

Economic savings have been realized by every customer using Geotube technology over traditional dewatering, remediation processes.


top


8) Can Geotube technology contain contaminated material such as PCBs?

Yes, Geotube technology has been chosen by both governmental agencies and private companies as the leading way to safely contain most contaminants, especially PCBs. Getubes also provide the added protection of aerating contaminants when processed through an older technology of mechanical methods. Economic reasons are again a key factor.


top

9) How do I find out if Geotube containers are right for our needs?

Contact a Geotube representative to discuss your goals and objectives. Experiences with similar applications may already exist that can answer your questions. If not, we normally start with a bench trial (RDT) to determine if there is a good chance of success. Then a hanging bag trial can be performed using about 40 to 50 gallons of the material for each bag to help provide estimated chemical needs, dewatering rates, filtrate concentrations, etc. In a few applications a full size Geotube container is installed as a pilot study.


top

10) Can Geotube technology dewater and contain Alum sludge?

Yes, It will probably require a polymer to assist in flocculation. This will result in very clean filtrate and solids comparable to older mechanical dewatering technology.


top


11) Can Geotube technology dewater and contain fly ash?

Yes, It may need a polymer to assist in flocculation is the ash is very fine and light such as wood ash. Most coal fly ash has dewatered without polymers to very high solids.


top

 
 
Dewatering,dewatering bags, dewatering methods, mobile dewatering, sludge dewatering, wastewater sludge, dewatering equipment, dewatering systems, geotube dewatering, dewatering wastewater sludge, refinery dewatering. Chemical plant dewatering, pulp/paper dewatering, municipality sludge dewatering, power plant dewatering, mining dewatering, agriculture dewatering, golf course dewatering, automotive dewatering, food processing dewatering.