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Method and apparatus for treating organic drainage and sludge

A sludge, organic technology, applied in chemical instruments and methods, biochemical equipment and methods, water pollutants, etc., can solve problems such as low treatment efficiency

Active Publication Date: 2007-05-23
EBARA ENG SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there has always been a problem that the overall treatment efficiency of the system for other substances contained in the sludge is very low in order to remove the very small amount of harmful heavy metal substances present in the sludge.

Method used

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  • Method and apparatus for treating organic drainage and sludge
  • Method and apparatus for treating organic drainage and sludge
  • Method and apparatus for treating organic drainage and sludge

Examples

Experimental program
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Embodiment

[0083] Next, an example in which the waste water treatment technology of the present invention is actually incorporated into a test plant will be explained, but the present invention is not limited to this example.

[0084] This embodiment is a pilot test, and the test uses the anaerobic digestion sludge of sewage treatment facility A, and the process flow is the same as that shown in accompanying drawing 2 above. The goal is to recover the MAP particles in the sludge as a phosphorus source and to remove harmful particles such as heavy metal particles in the sludge to improve the utilization rate of the discharged sludge as a cement raw material. Sewage treatment facility A adopts anaerobic and aerobic activated sludge treatment methods. In the anaerobic digestion chamber 22 , a mesophilic digestion process at 35° C. was carried out and the standing time was 25 days.

[0085] In this embodiment, the steps shown in FIG. 1 are adopted as the particle separation process 23 . Sp...

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Abstract

The purpose of the present invention is to provide a method and apparatus for treating organic drainage or sludge which enable formation of sludge having a comparatively low content of heavy metals with ease and at a low cost and further recovery of a useful valuable substance at the same time by separating and removing heavy metal derived particles from organic drainage containing high concentration organic substances, phosphorus and nitrogen and efficiently recovering valuable particles such as MAP. One embodiment of the present invention refers to a method of treating organic drainage and sludge comprising an anaerobic digestion treatment step, which further comprises separating heavy metal derived compound particles in a particles-in-liquid state from two or more types of fine particles existing in the sludge of the anaerobic digestion treatment step utilizing a separation means comprising a fine particle classification means utilizing at least two properties of specific gravity, particle diameter, surface charge, magnetism and wettability of the particles.

Description

technical field [0001] The present invention relates to a system for treating organic wastewater in sewage treatment facilities and various wastewater treatment facilities, and more particularly, to separation and removal of fine particles such as heavy metal compounds from wastewater containing high concentrations of organic matter, phosphorus and nitrogen, and small amounts of heavy metal components The present invention also relates to a sludge treatment method and apparatus for efficiently separating and recovering useful resources such as magnesium ammonium phosphate (hereinafter referred to as MAP) crystals from organic sludge and the like. Background technique [0002] A conventional method for treating heavy metals in organic sludge (hereinafter simply referred to as sludge), for example, is to add acid to sludge, dried sludge, or ash obtained by incinerating sludge to elute out Heavy metal ions, then (1) add alkali to the obtained eluate, and then add ferric chlorid...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F1/00C02F1/38C02F1/48
CPCC12M21/04C02F2101/105C02F11/04C12M47/10C02F2101/38C02F2101/30C02F1/488C02F1/001C02F2101/20C02F1/38C02F2001/007
Inventor 萩野隆生小林厚史野村淳一泽井贤司石川英之平岛刚
Owner EBARA ENG SERVICE
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