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Installation of “Mark Save All” System for Efficient Fibre Recovery & Better Process Water Quality

Description

This case study describes how used water from the paper machine can be treated by the 'Save-all' device that separates solids (fibres and filler) from the process water. It usually operates on a filtration, sedimentation, flocculation, or flotation principle (typically drum or disc filter or dissolved air flotation units etc.).

Implementing Industry

Rama Pulp & Papers Limited (Rama Pulp) is engaged in manufacturing various types of papers, mainly cultural and specialty grades. It is a medium scale industry, established in 1980. Products manufactured are Absorbent Kraft Paper & OTC (One Time Carbon) with present capacity of 40 TPD paper production.

Implemented technology / technique

BEFORE:

  • The paper production process involves the recirculation of process water in order to keep fresh water consumption as low as possible. The past practice adopted by industry included, supply of back water from paper machine directly to the overhead (O/H) tank, through which some portion of water was supplied to the centri-cleaner and hydro-pulper for dilution purpose, while the overflow of overhead tank was sent to ETP for treatment. 

  • The overflow from overhead tank containing fibres was lost through treatment process where after the decantation, the fibres resulted in sludge formation. The non-recovered fibre through decanter also resulted in increased TSS in effluent.

AFTER:

  • A “Mark Save-All” system is being introduced by the industry, which works as a system for efficient recovery of fibres and generating better quality process water for recirculation.

  • The process water from paper machine goes to the Mark Save-All which is a conical tank in which the solid contents are settled at the bottom by gravity and then it can be recovered (400 kg per day) and are fed to the paper machine through a Fan pump. The clear water as overflow is sent to a RCC storage tank through which it will be recirculated to different process like Thickener shower, Turbo dilution, Johnson Screen and chemical preparation for pulping.

Economic benefits

The capital cost invested by the industry was Rs. 25,00,00 0 with a total savings of Rs. 26,28,000 per annum giving simple payback in 11 months.

Environmental benefits

This system is also expected to reduce 25-30 m3 per day fresh water consumption by recovering the clear water. 

Contact details 

Mr. A. K. Sharma (Director); a.k.sharma@ramapulp.com