SOLID WASTE GENERATION IN KRAFT PULP MILLS

The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems.

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Toward Production of Bioethanol Using Pulp Rejects from Kraft Pulp Mills as Raw Materials

JAPAN TAPPI JOURNAL ◽

10.2524/jtappij.67.1248 ◽

2013 ◽

Vol 67 (11) ◽

pp. 1248-1251

Author(s):

Masanori Kishino ◽

Ken Orihashi ◽

Akira Harada

Keyword(s):

Kraft Pulp ◽

Raw Materials ◽

Pulp Mills ◽

Kraft Pulp Mills

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ASSESSMENT OF SOLID WASTE GENERATION AND MANAGEMENT IN SELECTED SCHOOL CAMPUSES IN PUDUCHERRY REGION, INDIA

Environmental Engineering and Management Journal ◽

10.30638/eemj.2019.047 ◽

2019 ◽

Vol 18 (2) ◽

pp. 499-512 ◽

Cited By ~ 1

Author(s):

Sunil Kumar ◽

Rajamanikam Ramamoorthy ◽

Gopalsamy Poyyamoli

Keyword(s):

Solid Waste ◽

Waste Generation ◽

Solid Waste Generation

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Solid Waste Generation of Household in Azad Kashmir: Case Study of Mirpur

SSRN Electronic Journal ◽

10.2139/ssrn.3096864 ◽

2018 ◽

Author(s):

Waqas mname Ali ◽

Rashid mname Khalil ◽

Shujahat mname Ali

Keyword(s):

Solid Waste ◽

Waste Generation ◽

Solid Waste Generation ◽

Azad Kashmir

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Activated Sludge Treatment of Kraft Mill Effluents from Conventional and Oxygen Bleaching

Water Science & Technology ◽

10.2166/wst.1991.0499 ◽

1991 ◽

Vol 24 (3-4) ◽

pp. 427-430 ◽

Cited By ~ 3

Author(s):

J. Nevalainen ◽

P.-R. Rantala ◽

J. Junna ◽

R. Lammi

Keyword(s):

Activated Sludge ◽

Kraft Pulp ◽

Activated Sludge Process ◽

Chlorinated Phenols ◽

Pulp Mills ◽

Main Interest ◽

Sludge Treatment ◽

Kraft Pulp Mills ◽

Activated Sludge Processes ◽

Oxygen Bleaching

Conventional and oxygen bleaching effluents from hardwood kraft pulp mills were treated in laboratory-scale activated sludge processes. The main interest was the fate of organochlorine compounds in the activated sludge process. In the treatment of conventional bleaching wastewaters the BOD7-reduction was 80-91 % and in oxygen bleaching wastewaters 86-93 %. The respective CODCr removals were about 40 % and about 50 %. The AOX reductions were on average 22 % and 40 % in the treatment of conventional and oxygen bleaching effluents, respectively. The reductions of chlorinated phenols, guajacols and catecols were usually more than 50 % in both reactors. Very little accumulation of AOX into the sludge was observed. The stripping of AOX from aeration unit was insignificant.

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