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Paper and Pulp Industry

Home Domain Domain expertise Paper and Pulp Industry

Paper is produced from new or recycled pulp. Depending on the quality of pulp, it’s used for different sorts of paper. During the process of paper producing, kaolin, CaCO3, talc and/or TiO2 are added to the pulp, to give the paper whiter color. Also chemicals like organic fillers (starch, latex), colors, aluminum sulfate, etc. are used to make paper of different properties or making the process simpler. The effluent from paper and pulp industry generally contain spent chemicals, corrosive wastes arising from use of strong acid and bases, process sludge containing adsorbable organic halides, phenol/phenolic compounds. Effluent from this industry has high BOD, COD, oil, grease, and total suspended solids. Therefore it is necessary for Effluent Treatment Plants to maintain their COD and other parameters of their effluent to meet specifications decided by regulatory board. Paper can be decolored, which can be done with two different processes. Washing the pulp with a high amount of water or washing with a low amount of water plus additions like sodium silicates, sodium carbonate, fatty acids or non ion detergents. This washed water is having following properties.

  1. Approx. 30 m3/t pulp with mechanical processes and up to 150 m3/t pulp with chemical process. The waste water contains up to 10- 30% of fibers, fibrils and CaCO3, The waste water contains up to 10- 30% of fibres, fibrils and CaCO3.
  2. BOD5 and COD load vary between different kind of wood (BOD5: 100- 1000mg/L; COD:300- 4000mg/L)

The effluent treatment method mainly includes membrane separation. Two types of membrane used for effluent treatment are ultrafiltration or nanofiltration membrane. The treatment with membrane system effectively reduce BOD,COD, TDS, TSS and color bodies from effluent streams that is discharged pulp and paper mills. The liquid fraction is filtered freely without the building up of solids over membrane, thereby reducing the fouling possibilities. If there is a possibility of TDS buildup, reverse osmosis filtration can be used. The treated wastewater can be discharged or recycled back into the mill for reuse. Sludge from filter press normally dispose to sludge yard. After membrane process treated effluent is used for further treatment like tertiary treatment. The characteristics of discharge effluent vary, depending on the product manufactured, the materials used in the process, and the other process details. The typical characteristics of discharge effluent for paper and pulp industries (indicative molasses based spent wash) are listed in the table below:

Sr. No. Parameter Unit Concentration range
1 Color - Black
2 Odor - Rotten egg
3 Temperature ºC 35
4 pH - 6-9
5 Total solid mg/lit 1980
6 Total suspended solid mg/lit 1640
8 BOD mg/lit 360
9 COD mg/lit 2300

Problems in ETP:

  • High pollution load and have continued to pose a critical problem of environmental pollution
  • High temperature of the wastewaters may instantaneously kill fish and other aquatic organisms, thus destroying the flora and fauna of a river, when the wastewaters are discharged into it
  • High volume of effluent to be handling
  • More chemical usage for neutralization
  • High concentration of readily decomposable organic matters
  • Foul smell due to decomposition of soluble and suspended organic matters present in the wastewaters
  • Presence of refractory compounds
  • High operating treatment cost
  • Low yield of biogas due to byproducts

HyCator® Reactor Systems for Paper and pulp Industry

HyCa Technologies have a range of products which are environmentally safe and cost effective for effluent treatment of Paper and pulp Industry. We generally suggest HyCator® reactor systems to effluent treatment plants in the following manners but it varies as per the client requirements and limitations.

The applications of HyCator® reactor at effluent treatment plant are listed below:

  1. HyCator® MBDwill increase digestibility of the effluent in UASB digestor and aerator by breaking long-chain / polymeric/ refractory compounds and thus reduce the COD and increase the Biogas production. HyCator® MBD can also be installed in the inlet effluent streams (High load) / neutralization tank or recycle stream of effluent, if any.
  2. HyCator® OLMwill ensures energy efficient, precise, microlevel, online mixing even at very high flows. It will help to reduce the chemicals in neutralization and subsequent processes
  3. HyCator® DOBwill increase the dissolved oxygen content in aerator tanks in compared to conventional surface aerator or diffused aerator and also increase the activity of microbes by de-flocking it. Thus results in reduction in sludge generation, hence lesser load on clarifiers and less solid disposal issues.

Quick Contact

  • + (91) (22) 2566 8037
  • 176, Udyog Bhavan, Sonawala Road,
    Goregaon (E), Mumbai - 400 063, INDIA