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Pressure Regulating Device on Filter Press for Efficient Moisture Removal


This case study describes how to improve the solid content in sludge through pressure regulating valve (as automation is an option) to in turn enhance the filter press efficiency

Implementing Industry

Daman Ganga Paper Mills is a medium sized company engaged in recycled packaging products. Company produce a range of recycled products such as Paper, Core-Board, Cores & Tubes, Fibre-Drums, Partition Boards, Insulation Boards, Acoustic Boards, etc. The company started its operation in the year 1982, with present production capacity of Kraft Board 60 Tons per day, with annual turnover of 50 Crores.

Implemented technology / technique


  • Filter press was used to remove the moisture content from the final effluent and recover the solid mass as sludge for further disposal as required.

  • The output of sludge cake from filter press consisted of solids upto 30% (approx. 4500 Kg/batch) and moisture upto 70% (10500 Kg/batch), the batch of 15 m3 effluent took about 48 hours’ time for dewatering at filter press. Thus the high moisture content required additional drying before disposal and requires additional space, as well. 


  • A pressure regulating device has been introduced which supplies the compressed air intermittently to maintain the required pressure between the plates of the filter press, so as to achieve the solid contents in final sludge cake more than 45% (6750 Kg/batch) with reduction in moisture content up to 15% (2250 Kg/batch).

  • The pressure regulating system was installed along with a dedicated air compressor of 15 HP for compressed air supply. 

Economic benefits

Capital cost invested by industry is Rs. 3,00,000 with operating cost of compressed air, although the savings in terms of improved water recovery (not accounted). Additionally the space required and time for drying before disposal has reduced. 

Contact details 

Mr. Banjul Shah, Director;