Walnut shell filter performance

I would like to know if walnut shell filter removes only free and emulsified oil or also dissolved hydrocarbons from water?

A typical wastewater stream has a significant COD load due to dissolved organics so I am curious if I can treat it with a walnut shell media filter.

Thanks!

Taxonomy

• Water
• Treatment
• COD Removal
• Industrial Wastewater Treatment
• Purification
• Filtration
• Technology
• Filters
• Wastewater Treatment
• Filtration Solutions
• Biological Treatment
• Water Treatment Solutions
• Industrial Water Treatment
• Filtration
• Organic Chemicals
• water treatment
• Water & Wastewater
• Water Treatment & Control
• Water & Wastewater Treatment
• Water
• Water
• Water Purification
• Total Dissolved Solids (TDS)

3 Answers

1. Normally walnut shell removes some dissolved hydrocarbons. As probably you know oil analysis uses a solvent that extracts organics that are soluble on it. So, if you are using n-hexane to analyse oil all hydrocarbons that are extracted with oil will be included in your analytical  result.

2. When removing oil why not use a sorbent?  such as OspreySorb.  It absorbs all hydrocarbons. one pound can adsorb 7. 4 gallons of oil and all hydrocarbons, Nontoxic and ASTM tested for a 30:1 ratio of oil. EPA Listed.  

3. Dear Sundeep,

   Filtra-Systems innovative Hydromation Walnut Shell Media Filter has overcome the limitations of conventional bed type industrial water filters by leveraging a maximum efficiency regeneration design. This media regeneration is achieved using the kinetic model of a Continuous Stirred-Tank Reactor (CSTR), which makes the backwash the most efficient, most powerful, most economical, and only scientifically proven regeneration technology offered on the market today.

    

   Features

    Because walnut shells special advantages as follows:

   1. Walnut shells have strong oil adsorption capacity; it can adsorb most of the oil in the oily sewage.

   2. Walnut shells can renewable after back washing; so that walnut shell filter media can be used again, saving water treatment costs.

   3. Walnut shells have strong pressure resistance; its pressure resistance is 23.4kgf/cm2.

   4. The chemical properties of the walnut shells are stable; it is almost not dissolved in acid and alkali solutions.

   5. The hardness of walnut shells is high, and its wear resistance is good too; it can be used for long time.

   6. Walnut shells have strong adsorption and pollutant catching capacity (adsorption rate 25-53%)

   7. Walnut shells are hydrophilic well, but oil immersion resistant.

   8. Because the specific gravity of the walnut shell filter media is little bigger than that of water (1.225g/cm3), it is easy for back washing and regeneration.

   Applications

   Walnut shell filtration was developed as a more suitable method of filtering free oil and suspended solids in applications where sand filters have traditionally been used. Today, walnut shell filtration is used to treat oil field produced water, refinery wastewater, steel mill direct spray and caster water, ethylene plant quench water, copper concentrate decant and cooling water. In addition, due to the reduction in backwash water volume and reduction in weight and footprint, this re-designed filter is suitable for many off-shore oil production applications.

    

   http://chou-seh-fu.com/presentations/chem260/WalnutShellFilterPresentation-final.ppsx