Fluoride removal

Due to high presence of fluorides in wastewater from several industrial sectors, that can not be removed with conventional chemical or physical treatments, in Servyeco we have developed a new innovative range of product which reduce fluoride content down to the technical and legal requirements.

 

Advantages over traditional alternatives

The reactivity of the fluoride ion makes its removal from effluents very complicated. One of the main techniques used for its treatment is based on the use of calcium compounds (usually calcium hydroxide). Calcium fluoride is obtained and collected in filter bags. However, it presents a great number of disadvantages such as low efficiency in total elimination of fluorides and generation of very bulky and bad-dewatered sludge.

Searching for more efficient alternative to solve the fluoride presence in industrial wastewaters, Servyeco has developed ECOFLUOR series with the following advantages:

• These products are usually applied directly so a previous dissolution in water is not necessary.
• Rigorous control of pH for optimal coagulant efficiency in order to remove as much fluoride as possible is necessary. Furthermore, in some cases, the use of ECOFLUOR products combined with pH control agents may significantly improve the efficiency of removal.
• These products are capable of removing fluorides present in wastewater, reaching levels of removal rate greater than 95%.
• The use of ECOFLUOR products has the advantage of producing a very compact sludge treatable by settling and subsequent filtration in industrial wastewater treatment plants, achieving a significant reduction of its volume and subsequent derived costs.
• The required product dose is minimized simplifying the treatment process and eliminating the addition of further coagulation aids.

 

Servyeco products

 

Sectors:

This series of products offer solutions for the next sectors (among others):

• Metal – mechanic sector
• Automotive sector
• Mining
• Fertilizers manufacturing
• Glass

 

Study cases:

ECOFLUOR Series products obtain a removal rate between values 53%-83% in automotive sector with initial doses of 10-100 ppm.

Treatment:

1000 ppm FeCl₃ (pH=8,5) + 320 ppm Calcium hydroxide (pH=10,5) + 1000 ppm Fluoride Removal + 6 ppm ECOPOL AS 100.

1. Customer’s treatment
2. ECOFLUOR B50
3. ECOFLUOR B70
4. ECOFLUOR A70
5. ECOFLUOR A50

With the product ECOFLUOR B70 we can improve the fluoride elimination percentage by 19%, reaching a level of 96% of removal.