What is a walnut shell filter

Although filtration is the most effective method of removing the suspended matter in the water, but to the water including oil and grease, the normal filtration processing does little. Walnut shell filter is developed especially to treat the waste water including oil and grease.
Walnut shell filter is normally applied to oil field and other oily sewage. Presently, the walnut shell filter is playing a great role in oily waste water treatment in various industries.
Walnut shell filter adopts walnut shell after special processing as filter medium. Walnut shell has strong adsorptive interception capacity (adsorption rate: 25~53%) and stress tolerance (23.4kgf/cm2); walnut shell can be backwashing and regeneration; walnut shell has strong the chemical property of walnut shell is stable not easy to dissolve in the acid solution or alkali solution; the hardness of walnut shell is strong; walnut shell has good abrasion resistance, not needing replacement for long time; walnut shell has good hydrophilicity and oil impregnation. Because the specific gravity of walnut shell (1.255g/cm3) is bigger than that of water, it’s easy for backwashing and regeneration. And even its biggest advantage is adopting the water before filtration directly to back wash, not needing the help of air supply and chemical agents. As a result, the running costs of walnut shell filter is low; the management of walnut shell filter is simple; the backwashing strength of walnut shell filter is small; the filtration effect of walnut shell filter is good; the filter materials of walnut shell filter is not easy becoming putrid for long time; and even more, the walnut shell filter can be used singly or double in series according to water quality requirements.