Sand filtration
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Sand Filtration PowerPoint PPT Presentation


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Sand Filtration. Tipe :. Slow sand filtration Rapid (gravity) sand filtration Rapid (pressure) sand filtration. Pengertian .?. Sand filtration is a water purification process in which water is passed through a porous bed of filter medium Slow sand filtration? Rapid sand filtration?.

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Sand Filtration

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Sand filtration

Sand Filtration


Sand filtration

Tipe:

  • Slow sand filtration

  • Rapid (gravity) sand filtration

  • Rapid (pressure) sand filtration


Pengertian

Pengertian.?

  • Sand filtration is a water purification process in which water is passed through a porous bed of filter medium

    • Slow sand filtration?

    • Rapid sand filtration?


Parameter desain ssf

Parameter desain SSF


Perbedaan

Perbedaan?

  • Slow sand filters are distinguished from rapid sand filters by the biologically active sand medium (including the Biofilm), and slow detention times.

  • In a mature sand bed, a thin upper sand layer called a Schmutzedecke (Biofilm) forms. The Biofilm consists of biologically active microorganisms that break down organic matter while suspended inorganic matter is removed by straining.

  • Rapid sand filters utilize primarily a physical removal process, are periodically backwashed for cleaning, and operate with long detention times.

  • Slow sand filters are cleaned by periodically scraping the existing Biofilm.


Sand filtration

RAPID SAND FILTER

SLOW SAND FILTER

  • Effective size: 0.35-0.50 mm

  • Uniformity coefficient: >1.3/1.7

  • Filtration Rate : ~ 5 m3/m2.jam

  • Effective size: 0.15-0.35 mm

  • Uniformity coefficient: 2-3

  • Filtration Rate : 0.1-0.2 m3/m2.jam


Operasi

Operasi


Mekasnisme proses

Mekasnismeproses..

  • Mechanical, Phisical

  • Biological

LapisanBiofilm


Backwash

Backwash.

When is Backwashing Needed?

  • The head loss is so high that the filter no longer produces water at the desired rate; (Filter Mampet)

  • Floc starts to break through the filter and the turbidity in the filter effluent increases; (Effluent keruh)


Backwash1

BackWash


Sand filtration

Expansion area = 20-50 % dariketinggian bed filter


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