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Method and system for reducing phosphorus in effluent or filtrate

A technology of effluent and filtrate, applied in the field of phosphorus systems, can solve problems such as complex operation, high investment and operating cost

Active Publication Date: 2017-02-15
UPM-KYMMENE OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of tertiary treatment are high investment and operating costs
P-concentrated microorganisms work in anaerobic media, which complicates the required handling and involves special handling of the effluent to be used

Method used

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  • Method and system for reducing phosphorus in effluent or filtrate
  • Method and system for reducing phosphorus in effluent or filtrate

Examples

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Embodiment

[0170] Embodiments of the invention will be described in detail below, an example of which is illustrated in the accompanying drawings.

[0171] The following description discloses some embodiments of the present invention, so that those skilled in the art can use the present invention based on the description. Not all steps of the embodiments are discussed in detail since many steps will be apparent to those skilled in the art based on the description.

[0172] For the sake of brevity, the numbering of terms in the case of repeated components in the following exemplary embodiments remains consistent.

[0173] figure 1 A method according to one embodiment of the invention is shown for the reduction of phosphorus in the effluent or filtrate from a process comprising at least one stage where the conditions are acidic. In this embodiment, the process comprises at least two separate process stages in which the conditions are acidic. In step a), a first portion of the effluent o...

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Abstract

The invention relates to a method for reducing phosphorus in effluent or filtrate from a process which comprises a stage in which green liquor dregs are filtered using a green liquor dregs filter and at least one stage in which conditions are acidic, wherein the method comprises the steps of: a) obtaining an effluent or filtrate from a stage in which conditions are acidic; b) adjusting pH of at least a portion of the effluent or filtrate to alkaline with an alkaline agent; c) allowing phosphorus to be precipitated in form of a phosphate salt; d) separating the precipitate to produce purified effluent or filtrate and a sludge comprising the precipitate; and e) filtering the sludge comprising the precipitate obtainable from step d) using the green liquor dregs filter.

Description

[0001] Field of Invention [0002] The present invention relates to a method for reducing phosphorus in effluent or filtrate from a process comprising a stage of filtering green liquor sludge with a green liquor sediment filter and at least one stage in which conditions are acidic. The present invention also relates to a system for reducing phosphorus in the effluent or filtrate from a process, especially a chemical pulping process. [0003] Background of the invention [0004] Effluents generated in pulp or paper mills or other plants that generate effluents are often treated in wastewater treatment plants to reduce the levels of compounds that may be harmful to the environment, such as phosphorus. Phosphorus must be removed from plant effluents into the environment (eg water systems) to prevent contamination. Due to increasingly stringent environmental regulations limiting phosphorus discharge, there is a need to reduce the phosphorus content in effluents that are transporte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/04
CPCC02F1/58C02F9/00C02F1/52C02F1/66C02F1/001C02F2103/28C02F11/12C02F2101/105C02F2209/18C02F2209/06C02F1/5236D21C11/0028C02F2001/5218C02F2301/043D21C11/0042D21C11/0085D21C11/02Y02P40/40C02F3/02D21C11/0007
Inventor M·里斯托莱南E·哈西宁S·萨雷拉
Owner UPM-KYMMENE OYJ
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