About didem

This author has not yet filled in any details.
So far didem has created 147 blog entries.

Paper Sludge Composting and Agricultural Utilization

Categories: Environmental|Tags: , , , , , , , |

Paper Sludge Composting and Agricultural Utilization Nearly all types of paper industry waste are suitable for composting. These include fiber-containing sludges, deinking sludges, bark, wood residues, and biological sludges from effluent treatment plants. Rejects from recovered paper pulping and screening operations are not suitable or suitable only to a limited degree. With this type of [...]

Choice of Combustion Technology : Paper Sludge

Categories: Environmental|Tags: , , , , , , , , |

Choice of Combustion Technology The choice of combustion technology depends on the operating conditions and the nature of the waste. According to today’s knowledge, fluidized bed combustion is the most suitable for burning sludges and rejects. In fluidized bed combustion neither fluctuations of heating value of the fuel nor changing proportions of non¬combustible components such [...]

Energy Recovery from Paper Sludge

Categories: Environmental|Tags: , , , , , , , , , |

Energy Recovery from Paper Sludge In the pulp and paper industry there is a long tradition of waste incineration. For example, consider the combustion of bark and wood residues. Recent years have seen a growing interest in the use of other types of waste such as sludges and rejects for energy production purposes. The reasons [...]

Paper Mill Waste Dryingand Utilization and Final Disposal of Solid Waste

Categories: Environmental|Tags: , , , , , |

Paper Mill Waste Drying Thermal drying processes are used for more comprehensive removal of water from mechanically dewatered sludges. Sludge dryers find use primarily when available or potential disposal processes are impossible or uneconomical, e. g. high landfill costs per ton of moist sludge due to insufficient dryness. Besides giving mass reduction, drying of the [...]

Paper Mill Waste Handling

Categories: Environmental|Tags: , , , , , , , , |

Paper Mill Waste Handling The aim of in-mill waste handling is usually to achieve as high a dry solids content as possible, because all commonly used methods for material and energy recovery benefit from a high solids content. In a sludge suspension, water exists in the following forms: . • Free water . • Capillary [...]

Paper Mill Deinking Sludges

Categories: Environmental|Tags: , , , , , , , , , | Paper Mill Deinking Sludges Deinking sludges consist of fillers and coating pigments, fibers, fiber fines, print¬ing inks (black and colored pigments), and adhesive components. Figure 10.7 shows that more than 55 % of the solids removed by flotation are inorganic com¬pounds. They are primarily fillers and coating pigments such as clay and calcium carbonate. [...]

Paper Mill Rejects

Categories: Environmental|Tags: , , , , , , | Paper Mill Rejects The amount of rejects produced during recovered paper processing and their com¬position depends largely on the recovered paper grades. Figure 10.6 shows the composition of a reject sample as a mixture of rejects from six paper mills produc¬ing newsprint. Pulper and drum pulper are used for slushing of the recovered paper [...]

Papermaking Solid Waste Composition and Characteristics

Categories: Environmental|Tags: , , , , , , |

Papermaking Solid Waste Composition and Characteristics As shown in Fig. 10.5 most of the German paper industry’s waste is generated in recovered paper processing. To produce recycled fiber pulp suitable for use in the manufacture of different paper and board grades all substances likely to disturb the processing of recovered paper or the quality of [...]

Solid Waste

Categories: Environmental|Tags: , , , , , |

Solid Waste The different processes within the pulp and paper industry result in the formation of different solid and sludge-like residues. In terms of volume, the largest are those from the deinking of recovered paper and from the treatment of effluents. Wood residues are also produced in large quantities, mainly in the pulp production. Other [...]