.

Drinking Water

Water filter export enterprise

activated carbon for Water treatment

Powder activated carbon differs greatly fromparticles activated carbonin the application and each type has its respective advantages in the water disposal.

Content

powder activated carbon

particles activated carbon

types of eliminated compounds

taste&odor

taste&odor

organic micro pollutants

organic micro pollutantsDOCbiodegradable(BDOC, AOC)suspending substanceoxidizer residue

typical application

seasonal application or applied when there is some problem in water

continuous demand when using activated carbon

the residue density of the targeted impurity after disposal

low

low/extremely low

application and disposal equipment

condense/flocculationfilter(occasionally)

special absorbertransformed sand filter

regeneration

none(disposable)

heat regeneration

device needed

feeding device

filtering containerdelivery/operative devicefor particles activated carbon

Particles Activated Carbon- advanced technology

Filtering with particles activated carbon is the currently updated technology for disposing water, used alone or after ozonization as the terminal step (polishing). Because the organism is ozonized, the biological activation of the particles activated carbon is obviously improved, and the life expectancy of the filter is prolonged.

Disposed Objects

Particles activated carbon is mainly used to remove various soluble organisms with different molecular weight: compounds relevant to taste& odor, total organic matter (DOC,TOC,KMnO4 value, absorbed UV), biologically degradated organisms (AOC, BDOC), pesticide, detergent. In addition, it can remove the suspended substance and oxidizer residue (such as ozone).

Types of Filters

Gravity filter is the most ordinary type, also there is pressure filter. Exclusive filters and other available types can also be applied in the activated carbon absorption. Those exclusive filters are specially designed for particles activated carbon, and their typical empty bed contact time (EBCT) is 10-20 minutes.

Remodeling of available filters

• Rapid sand filtering: to change into particles activated carbon ormultilayer particles activated carbon/sand and obtain the relative short EBCT (< 10 minutes)

• Slow sand filtering: to put particles activated carbon at the top or between two layers of sand and obtain the relative long EBCT (> 30 minutes)

Types of Particles Activated Carbon

During the disposal process of drinking water, various impurities should be removed, therefore, a multitude of particles activated carbon have been developed by our company. Some of them are for special applications, and the other are multifunctional. The major types and applications of the particles activated carbon for purifying drinking water are as follows:

Dqtype

iodine value

bed density(kg/m3)1

valid size(mm)

uniformity coefficient

raw material

Dq1240

1075

440

coal

Dq 1020

1050

440

1

coal

Dq830

975

460

coal

Dq 40S

950

460

coal

Dq 50S

1050

345

N/A 2

N/A 2

peat

Dq PK 1-3

800

255

peat

Dq PK 3-5

800

230

peat

Dq GCN 1240

1050

450

coconut shell

Dq GCN 830

1050

450

coconut shell

Purity Demand

Particles activated carbon applied in the drinking water can reach the strictest request of purity, comply with the American Food and Chemistry Regulation (the 4th version, 1996), and meanwhile meet the demand of precipitation of metals, PAH and cyanide set by EN12915(European standard, 1999).

Powder Activated Carbon---Low Investment Cost

Powder activated carbon is widely used in the disposal of drinking water to eliminate the taste/stink, organic micro-pollutants, such as pesticide.

Advantages of our powder activated carbon:

• Flexibility: Dose and type can be changed according to practical demand (for example, under certain emergency)

• Low investment:Separation of powder activated carbon can be undertaken with the solid separation.

• High efficiency for certain compounds.

• Saving cost

Ultra Filtering (UF)

In this recently developed separation technology, powder activated carbon is added in the upstream of the UF system--- ultrafiltration membrance will separate the powder activated carbon from water. According to the backwash break, powder activated carbon will remain active for 1 hour to the maximum extent.

Rapid Sand Filtering (RSFs)

When powder activated carbon is added before rapid sand filtering, it will be separated over the filtering process (maybe with the help of flocculating agent). The pure contact time can be considered from two different perspectives:

• Hydraulics: the staying time between feeding and filtering of powder activated carbon (normally < 1 hour)

• Filtering:the gross staying time of powder activated carbon in the filter, that is to say, the average period between two continuous backwashes (normally > 1day).

Powder Activated Carbon: Package, Operation and Feeding

Packaged and provided in small paper bag, large packing bag or large scale tank.

• Particles of powder activated carbon that will be decomposed in water: a 3mm-diameter pill which will decompose into powder after contacting with water

• Wet powder activated carbon

Under normal condition, the moisture quality is 50%, and it can be used in the dust-free operation.



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