Aluminum Chlorohydrate ACH vs Polyaluminum Chloride PAC

Aluminum chlorohydrate and Polyaluminum Chloride are both commonly used for water treatment. Then, why is Aluminum Chlorohydrate selected as the safe coagulant for drinking water treatment?

Comparison on Technical Specification:

Parameter	PAC		ACH
Appearance	Solution	Powder	Solution	Powder
Al2O3 % ≥	10	29	23	46
Basicity %	40-49		82-90
Density(20℃)/(g/cm3) ≥	1.12	-	1.33	-
Insoluble Substance % ≤	0.2	0.6	0.01	0.02
pH Value(10g/l Aqueous Solution)	3.5-5.0		3.5-5.0
As % ≤	0.0002		0.0001
Pb % ≤	0.001		0.0005
Cd % ≤	0.0002		0.0001
Hg % ≤	0.00001		0.00001
Cr6+ % ≤	0.0005		0.0005
Fe % ≤	Not Required		0.01	0.02

Form the above data comparison we can see that technical requirements of Aluminum Chlorohydrate is much stricter than Polyaluminum Chloride. ACH owns less insoluble substance and less impurities. ACH is more healthy than PAC.

Comparison on Dosage:
Aluminum chlorohydrate owns the highest aluminum concentration and basicity in all commercially available aluminum-based solution. To treat the same raw waters, Aluminum chlorohydrate requires the minimum dosage.

Comparison on Treated Outlet Water Quality:
Aluminum residue is an important controlling point in the treated drinking water from water works. Aluminum is not easily discharged after being absorbed by the human body, and will accumulate in the human body. Excessive aluminum will cause health problems, such as Alzheimer's disease, dementia, and bone disease.

The performance of ACH Aluminum chlorohydrate is much better than PAC on both the turbidity control and aluminum residue. By well controlling the dosage of ACH Aluminum chlorohydrate, aluminum residue even can't be detected in treated outlet water, with less aluminum residue.

Sample Description	Raw	1	2	3	4	5	6	7	8	9	10
Sample Volume(ml)	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000	1000
Initial pH	4.84	4.84	4.84	4.84	4.84	4.84	4.84	4.84	4.84	4.84	4.84
Soda(ppm)		8	8	8	8	8	8
Dosed Coagulant
Alum, ppm		20	22	24	26	28	30
ACH, ppm								3	6	9	12
Supernatant Water Quality
Turbidity(NTU)	1.97	0.51	0.51	0.29	0.26	0.28	0.32	1.22	0.89	0.21	0.81
Al(mg/L)	0.065	0.117	0.095	0.089	0.097	0.132	0.168	0	0	0	0
Fe(mg/l)	0.71	-	-	-	-	-	-	0.03	0.01	0.01	0.01
Mn(mg/l)	0.021	-	-	-	-	-	-	0.011	0.011	0.009	0.009

Here Below are Data of ACH to Treat Water in Different Turbidity:

Sample Description	Raw	1	2	3	4	5	6
Sample Volume(ml)	1000	1000	1000	1000	1000	1000	1000
Initial pH	7.29	7.29	7.29	7.29	7.29	7.29	7.29
Dosed Coagulant
ACH, ppm		3	4	5	6	7	8
Supernatant Water Quality
Turbidity(NTU)	118	7.29	3.02	1.94	1.99	1.94	2.15
Al(mg/L)	0.039	0.001	0.001	0	0	0	0
Fe(mg/l)	1.31	0.2	0.11	0.07	0.03	0.03	0.09
Mn(mg/l)	0.136	0.056	0.05	0.048	0.053	0.051	0.053

Sample Description	Raw	1	2	3	4	5	6
Sample Volume(ml)	1000	1000	1000	1000	1000	1000	1000
Initial pH	4.95	4.95	4.95	4.95	4.95	4.95	4.95
Dosed Coagulant
ACH, ppm		1	2	3	4	5	6
Supernatant Water Quality
Turbidity(NTU)	186	8.76	8.41	2.27	1.12	1.49	2.84
Al(mg/L)	0.13	0.002	0.001	0	0	0	0
Fe(mg/l)	1.6	0.12	0.12	0.05	0	0	0
Mn(mg/l)	0.771	0.033	0.031	0.021	0.02	0.02	0.021

Sample Description	Raw	1	2	3	4	5	6
Sample Volume(ml)		1000	1000	1000	1000	1000	1000
Pre-Soda(ppm)		10	10	10	10	10	10
Dosed Coagulant
ACH, ppm		16		18		20
PAC, ppm			16		18		20
Supernatant Water Quality
Turbidity(NTU)	1.98	0.34	0.35	0.44	0.65	2.6	2.99
pH	4.97	6.39	6.18	6.35	5.9	6.3	5.68
Color(Haz)	168	36	27	15	13	33	40
Fe(mg/l)	1.39	0.27	0.3	0.15	0.23	0.62	0.68
Mn(mg/l)	0.023	0.011	0.02	0.013	0.018	0.027	0.025
Al(mg/L)	0.14	0.036	0.074	0.033	0.068	0.139	0.162
NH3(mg/l)	0.07	0.04	0.05	0.04	0.03	0.04	0.04

Aluminum chlorohydrate (ACH) can effectively coagulates over a broader pH range (as high as 5-9.5) than traditional metal salts and lower basicity polyaluminum chloride. It really do a good job in the controlling of aluminum residue. This is a key reason why ACH Aluminum chlorohydrate is in NSF(National Sanitation Foundation) Official Listings as Drinking Water Treatment Chemicals - Coagulation & Flocculation.

Aluminum Chlorohydrate ACH vs Polyaluminum Chloride PAC

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