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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 high investment and operating costs, and complex operations

Active Publication Date: 2017-02-22
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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] Example 1 - Phosphorus removal from acid bleached filtrate

[0162] Acid bleached filtrate (A / D1 filtrate) was obtained from a kraft pulp mill. 9m 3 / ADt Filtration flow is divided into two parts, the first part is 2m 3 / ADt and the second part 7m 3 / ADt.

[0163] The first part uses calcium hydroxide (Ca(OH) 2 ) aqueous solution treatment. Calcium hydroxide was used at a concentration of 1.84 g / l or 20 g / l. The pH of the first portion was adjusted to 9.0, 9.2, 9.5, 9.8 or 10.0 by adding aqueous calcium hydroxide solution. The precipitate was removed by decantation 2 hours after adjusting the pH to basic, or by filtration through a fiberglass filter 2 minutes after adjusting the pH to basic. After removing the precipitate, the purified filtrate obtained from the first part is combined with the second part and sent to the wastewater treatment plant.

[0164] Samples were taken from the first portion of the filtrate before adding the calcium hydroxide solution and...

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Abstract

The invention relates to a method for reducing phosphorus in effluent or filtrate from a process which comprises at least one stage in which conditions are acidic, wherein the method comprises the steps of: a) obtaining a first portion of an effluent or filtrate from a stage in which conditions are acidic; b) obtaining a second portion of an effluent or filtrate from the same or different stage in which conditions are acidic; c) adjusting pH of the first portion of the effluent or filtrate to alkaline with an alkaline agent; d) allowing phosphorus to be precipitated in form of a phosphate salt; e) separating the precipitate by filtration to produce purified effluent or filtrate; and f) combining the purified effluent or filtrate with the second portion of the effluent or filtrate. The process may be a chemical pulping process in which pulp is cooked in a digestion apparatus (1), washed in a washing apparatus (2), bleached in a bleaching apparatus (3) in which an acidic bleaching stage (3') takes place, after which the pulp is separated in a separation apparatus (4) from an acidic effluent or filtrate which is divided into the first and second portions of effluent or filtrate. The invention also relates to the corresponding chemical pulping and purification apparatus.

Description

[0001] field of invention [0002] The present invention relates to a method of reducing phosphorus in an effluent or filtrate from a process comprising at least one stage where the 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 transported from plants to wastewater treatment plants and ultimately into the environme...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/66
CPCC02F1/5236C02F1/66C02F2001/5218C02F2101/105C02F2103/28C02F2301/043C02F1/001D21C11/0028D21C11/0042D21C11/0085D21C11/02Y02P40/40C02F1/52C02F1/58C02F3/02D21C11/00D21C11/0007
Inventor M·里斯托莱南E·哈西宁S·萨雷拉
Owner UPM-KYMMENE OYJ