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A reduction and dehalogenation process of excess activated sludge

A residual activity and dehalogenation technology, which is applied in sludge treatment, oxidation treatment sludge, water/sludge/sewage treatment, etc., can solve the problems of large output of AOX-containing residual sludge, secondary pollution, and high treatment costs. Achieve the effect of low operating cost, strong engineering adaptability, and simple operation process

Active Publication Date: 2017-09-26
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a reduction dehalogenation process for excess activated sludge, which can solve the problems of large output of AOX-containing excess sludge, high treatment costs, and easy secondary pollution. It is a cheap and easy-to-operate excess activated sludge Disposal methods for slime reduction, dehalogenation, and carbon source recovery

Method used

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  • A reduction and dehalogenation process of excess activated sludge
  • A reduction and dehalogenation process of excess activated sludge
  • A reduction and dehalogenation process of excess activated sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Taking the excess activated sludge of a sewage plant as the treatment object, the moisture content of the excess activated sludge after being treated by a centrifugal dehydrator is 80%, the AOX content in the sludge is 3.29g.AOX / kg. dry SS, and the filtrate COD About 2500mg / L.

[0056] A reduction and dehalogenation process for excess activated sludge, comprising:

[0057] (1) Dehalogenation: at 2m 3 The excess activated sludge is fed into the reduction dehalogenation tank at a flow rate of / h, and the reducing agent iron powder with an average particle size of 50 μm is added to the excess activated sludge. The dosage is 5g / kg SS, and the Stir at a rotating speed, keep the residence time of the remaining activated sludge in the reduction dehalogenation tank for 24 hours, and obtain the reaction solution I;

[0058] (2) Oxidation: Pass the reaction solution I into the oxidative dehalogenation pool, and add 30% H in the reaction solution I 2 o 2 , the dosage is 5g / kg ...

Embodiment 2～4

[0066] Identical with the activated sludge that embodiment handles, difference is processing method;

Embodiment 2

[0067] Embodiment 2 only adopts step (1); Embodiment 3 except lacking step (2), all the other steps are identical with embodiment 1; Embodiment 4 except lacking step (3), all the other steps are identical with embodiment 1.

[0068] Table 2 shows the halogen removal effect and sludge weight reduction effect of Examples 2 to 4 on excess activated sludge.

[0069] Table 2

[0070] serial number

[0071] Examples 2 to 4 all have adverse effects on the dehalogenation effect and the excess sludge reduction effect. Among them, the effect of step (1) on the dehalogenation effect is more obvious, and the effect of step (2) on the reduction effect of excess sludge is more obvious.

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Abstract

The invention discloses a process for reducing weight and dehalogenation of excess activated sludge. The process comprises the following steps: adding excess iron powder to the excess activated sludge, performing a reduction and dehalogenation reaction to obtain a reaction solution I; adding the reaction solution to the reaction solution Add an oxidizing agent to I, carry out an oxidation reaction, and obtain a reaction solution II; add an alkaline hydrolyzing agent to the reaction solution II, carry out a hydrolysis reaction, and obtain a reaction solution III; add a flocculant to the reaction solution III, and filter by plate and frame , obtain filtrate and filter residue. The reduction and dehalogenation process provided by the invention sequentially performs reduction and dehalogenation reaction, oxidation reaction and hydrolysis reaction on the remaining activated sludge, thereby realizing the reduction and dehalogenation of activated sludge, the AOX removal rate is as high as 90% or more, and the sludge volume is reduced. The quantity rate is over 74%.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a reduction and dehalogenation process of surplus activated sludge. Background technique [0002] Absorbable Organic Halogens (AOX) is an international water quality indicator that characterizes organic halides, including chlorides, bromides and iodides, excluding fluorides. Most of the components in AOX are highly toxic and lipophilic. These components persist in the water environment and cause potential harm to biological organisms through the enrichment of the food chain. [0003] Organic halogenation reaction is the chemical process of introducing halogen atoms into organic molecules to prepare halogen-containing compounds. After introducing halogen atoms into organic compound molecules, its physical and chemical properties will change to a certain extent, which often makes organic molecules have polarity or increased polarity. Reactivity Enhanced, easily replaced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06C02F11/14
Inventor 刘锐陈吕军范举红
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG