Question 1

Which activated carbon is used for municipal drinking water treatment?

Accepted Answer

Granular Activated Carbon (GAC) is the mainstream option. Coal based GAC is suitable for removing various organics with a long service life. Coconut shell GAC fits premium low dust drinking water. Its iodine value is 900-1000 mg/g. Powdered activated carbon (PAC) is used for seasonal odor control and emergency spill treatment.

Question 2

What principle does activated carbon use to remove residual chlorine from water?

Accepted Answer

Activated carbon removes free chlorine and chloramine via catalytic reduction on its surface, converting them into harmless chloride. It eliminates chlorine smell and protects membranes, resins and UV disinfection equipment. A qualified GAC bed can reduce residual chlorine below 0.1 mg/L.

Question 3

Can granular activated carbon remove disinfection by products such as THMs and HAAs?

Accepted Answer

Yes. GAC adsorbs natural organic matter (NOM) precursors which generate disinfection by products. Removing these precursors before final disinfection can reduce the formation of THMs and HAAs, ensuring effluent meets drinking water standards.

Question 4

Should we choose coal based or coconut shell GAC for drinking water pre treatment?

Accepted Answer

Coal based GAC is cost effective with strong organic removal performance. Coconut shell GAC has high hardness, low dust and high iodine value, which is ideal for premium drinking water, RO and UF pre treatment. Both types are available.

Question 5

What EBCT value is recommended for drinking water GAC filters?

Accepted Answer

5-10 minutes of EBCT is recommended for taste and odor improvement. 10-15 minutes of EBCT is required for TOC and DBP precursor removal. Custom bed size solutions can be offered according to your flow rate and water quality targets.

Question 6

What type of carbon and contact time are required for chloramine removal?

Accepted Answer

Chloramine is more stable than free chlorine. Catalytic coal based GAC is required. The recommended EBCT is 3-6 minutes to guarantee sufficient reduction performance.

Question 7

Can activated carbon remove PFAS, PFOA and PFOS from water?

Accepted Answer

Yes, GAC is a proven filter medium for PFOA and PFOS removal. With an EBCT of 10 to 20 minutes and regular breakthrough monitoring, effluent concentrations can be maintained below regulatory limits. Bituminous coal based GAC with an iodine value no less than 1000 mg/g is preferred.

Question 8

How much EBCT is needed for VOC removal from water?

Accepted Answer

10 to 20 minutes of EBCT is recommended for VOC treatment. Insufficient contact time will easily cause early contaminant breakthrough and shorten the service life of activated carbon.

Question 9

How often should granular activated carbon be replaced?

Accepted Answer

The typical service life of a GAC bed ranges from 6 to 24 months. The replacement cycle is affected by influent water quality, contaminant load, flow rate and EBCT. Monitor effluent quality and breakthrough curves to determine the optimal replacement time.

Question 10

What is the MOQ of activated carbon for water treatment?

Accepted Answer

Our minimum order quantity is 1 ton. Favorable pricing is available for bulk FCL full container load orders.

Question 11

What is the standard lead time for water treatment activated carbon?

Accepted Answer

Standard grade water treatment activated carbon can be delivered within 7 to 15 days. Batch by batch COA (Certificate Of Analysis) will be provided for each shipment.

Question 12

Can I apply for free samples before bulk purchase?

Accepted Answer

Yes. Free samples are available for clients to conduct lab water quality tests and performance evaluation before formal orders.

Question 13

What are the advantages of coal based granular activated carbon?

Accepted Answer

Coal based GAC has well developed mesopores for adsorbing large molecule organics. It features high cost efficiency and long service life, suitable for large flow municipal tap water and industrial wastewater projects.

Question 14

What are the main application scenarios of coconut shell granular activated carbon?

Accepted Answer

Coconut shell GAC has a high iodine value, low ash content and low dust output. It is widely used for high end drinking water purification, bottled water production, RO pre treatment, residential and commercial water filters.

Question 15

What risks will be caused by insufficient EBCT empty bed contact time?

Accepted Answer

Insufficient EBCT is the primary cause of early contaminant breakthrough. Water flows out of the filter tank before adsorption reactions finish, which leads to unqualified effluent and premature exhaustion of activated carbon.

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