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Method for removing dissolved organic compounds from wastewater

A technology for organic compounds and sewage, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high investment in tertiary treatment equipment, improve the coagulation-flocculation process and reduce inorganic pollution. The effect of stabilizing the amount of mud and pH value

Pending Publication Date: 2021-12-24
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it instead leads to the formation of a large amount of ash, which still needs to be landfilled later
[0004] Furthermore, the construction of tertiary treatment plants requires high investment in addition to a large working area

Method used

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  • Method for removing dissolved organic compounds from wastewater
  • Method for removing dissolved organic compounds from wastewater
  • Method for removing dissolved organic compounds from wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050]In this example, effluent from a paper mill was treated with varying doses of a 4% solution of aluminum sulfate (Alum) and anionic FennoPol A 8675 polymer flocculant (Kemira Oyj) dissolved in water to form a 0.1% solution combination, or

[0051] -4% aluminum sulfate (Alum) solution and anionic FennoPol A 8675 polymer flocculant (Kemira Oyj) dissolved in water to form a 0.1% solution and cationic polyamine coagulant (Fennofix FF C50, Kemira Oyj) dissolved in water to form A combination of 0.1% solutions is formed.

[0052] The reference measurement is the outlet of the secondary clarifier without any chemical addition.

[0053] The soluble phosphorus content of sewage is 0.25mg / L.

[0054] Approximately 30 L of effluent was collected to be able to use the same effluent sample for all tests. Sewage was stored in cold storage before starting the test. Homogenize the whole batch of samples and take 1L samples for coagulation test. Coagulation and flocculation tests wer...

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Abstract

A method for removing biologically recalcitrant soluble organic compounds from wastewater simultaneously in an activated sludge process comprising an aeration tank and a solid-liquid separation unit, in which method at least one Al and / or Fe based inorganic metal coagulant is added to the wastewater in the activated sludge process and / or prior to conveying wastewater to an activated sludge process.

Description

technical field [0001] The present invention relates to a method for the removal of biologically refractory soluble organic compounds from sewage according to the appended independent claims. Background technique [0002] Pulp and paper production is one of the most water-intensive industrial processes, generating huge volumes of highly polluted sewage per ton of paper or board produced. The chemical oxygen demand (COD) in pulp and paper wastewater can be as high as 5000 mg / L or even higher. Conventional water treatment facilities for such effluents include: primary clarifiers, which remove total suspended solids and other particulate matter; biological treatment, which removes most dissolved organic matter; secondary clarifiers, for activated sludge separation; and tertiary treatment , in the form of coagulation-flocculation processes using solid-liquid separation units, or ozonation, adsorption and other forms for the removal of biologically refractory soluble organic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F9/14C02F101/30C02F103/28
CPCC02F3/1215C02F1/5245C02F1/56C02F1/5263C02F2101/30C02F2103/28C02F2209/08Y02W10/10C02F2101/105C02F2209/06
Inventor 约兰·贝克曼萨卡里·哈尔图宁帕斯卡尔·莫林马里纳·舍斯塔科娃
Owner KEMIRA OY
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