Arsenic Removal from Ground Water - a Low Cost Filter Media

Results

Table II: Comparison between treatments obtained by three columns

(Bharatpur sample)

S.No.

Parameters

FeOOH Gel

Rust

Rust – Charcoal

Initial

Final

Initial

Final

Initial

Final

01

Arsenic Concentration

(mg/lit)

0.5

0.1

0.5

0.05

0.5

0.05

02

Arsenic Removal in %

---

80%

---

90%

---

90%

03

Total Solids (mg/lit)

2,100

2,900

2,100

2,200

2,100

1,900

04

Color

Clear

Reddish orange

Clear

Yellowish

Clear

Clear

 

Table III: Comparison between treatments obtained by three columns

(Std. Sodium Arsenite Solution 2 mg/lit)

S.No.

Parameters

FeOOH Gel

Rust

Rust – Charcoal

Initial

Final

Initial

Final

Initial

Final

01

Arsenic Concentration

(mg/lit)

2.0

0.4

2.0

0.2

2.0

0.2

02

Arsenic Removal in %

---

80%

---

90%

---

90%

03

Total Solids (mg/lit)

2.5

125

2.5

76

2.5

12.0

04

Color

Clear

Reddish orange

Clear

Yellowish

Clear

Clear

 Conclusion & Recommendations

  • This study proves that the waste Iron rust has the capacity to absorb Arsenic from groundwater and in greater strength compared to FeOOH Gel.  The Arsenic removal capacity of Gel was found to be 80% while the Arsenic removal capacity of Rust was 90%.
  • The backwash was required more frequently in the rust column in order for the Arsenic removal capacity to be effective. The Total Dissolved Solids and colour increased in FeOOH Gel but less so in rust column.  In the third column setup, the results were the most satisfactory as Arsenic removal reached 90%, and TDS and colour remained constant.
  • Through this study it is clear that rust technology is more effective than the hydrous ferric oxide (FeOOH) gel, and requires low investment and less effort. The rust method is also able to maintain the solid waste problem to a tolerant level.
  • Many technologies that were developed to remove Arsenic also tend to remove Iron from the water.  However, Iron is actually needed in the drinking water to improve the Arsenic removal in the absorption process.
  • For any Arsenic removal package, the implementation should incorporate the technology for sludge disposal and technical education for users.  There should also be a continuous supply of chemicals to the project.
  • It is highly recommended that a strong monitoring mechanism be in place to control the filtered water quality.

References

  1. Kamal, ASM and Preeda, P (2002) Arsenic Pollution in Hizla, Bangladesh: Causes, Effects and Remedies
  2. Journal Science Asia, 2002, Vol. 28. No.2 and International Agency for Research on Cancer, 1980)
  3. Chatterjee, A., Das, D., Mandal, B. K., Chowdhury, T. R., Samanta, G. and Chakraborti, D. (1999) Arsenic in groundwater in six districts of West Bengal, India: The biggest arsenic calamity in the World. Part1. Arsenic species in drinking water and urine of affected people. Analyst, 120, p. 643-650.
  4. BIS. Indian Standard Drinking Water-Specification (First revision 2003). Fifth reprint; Report No. ISO 10500; BIS: New Delhi, India.
  5. Initiative, Kushtia, Bangladesh
  6. R.Mamtaz, D.H.Bache,(2001) – (J water SRT Aqua 50 (page 313 – 324))Low cost Techniques of Arsenic Removal from Water and its removal mechanism

 

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