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Ferrate-based excess activated sludge reduction and reclamation method

A technology of ferrate and residual activity, which is applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problem of resource recovery of substances in sludge, large use of ferrate, and cost High-level problems, to achieve the effect of improving oxidation efficiency, low treatment cost, and less dosage

Active Publication Date: 2019-02-01
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of excess activated sludge reduction using ferrate as the reduction agent, the goal is to completely oxidize the excess activated sludge at one time, without considering the resource recovery of the substances in the sludge, resulting in The use of ferrate is large and the cost is high

Method used

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  • Ferrate-based excess activated sludge reduction and reclamation method
  • Ferrate-based excess activated sludge reduction and reclamation method
  • Ferrate-based excess activated sludge reduction and reclamation method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A 2 The / O process treats the remaining activated sludge in the sewage treatment plant of municipal sewage for reduction and resource recovery.

[0048] 1) Take 1000mL of the above-mentioned remaining activated sludge, and the concentration of MLSS is 10000mg / L. First adjust the pH of the sample to 11, then add fresh K 2 FeO 4 , the dosage is 40mg (Fe 6+ ) / gSS, maintain a stirring speed of 400rpm / min, carry out the first oxidation reaction, the duration is 1.5h, and obtain the preliminary pretreatment product.

[0049] A small amount of mud-water mixture after preliminary pretreatment was taken for measurement. At this time, the MLVSS in the solid-phase sludge of the mud-water mixture was 4930mg / L. The concentration of SCOD in the liquid phase is 13350mg / L, the concentration of organic nitrogen is 1169.9mg / L, the concentration of ammonia nitrogen is lower than 10mg / L, PO 4 3- -P concentration is 38.8mg / L, Fe in solid phase is Fe 3+ form exists.

[0050] 2) Then ...

Embodiment 2

[0072] 1) Use the residual sludge of a municipal sewage treatment plant to treat sewage with oxidation ditch process for reduction and resource recovery. Take a sample of 2000mL, and the concentration of MLSS is 2000mg / L. Adjust the pH of the sludge to 11 for alkaline K 2 FeO 4 Pretreatment, that is, first adjust the pH of the sample to 11, and then add fresh K 2 FeO 4 , the dosage is 50mg (Fe 6+ ) / gSS, maintain a stirring speed of 400rpm / min, carry out the first oxidation reaction, the duration is 1.5h, and obtain the product after preliminary pretreatment.

[0073] Take a small amount of the product after preliminary pretreatment and separate it from water for measurement. At this time, the MLVSS in the solid phase sludge is 9930mg / L, and Fe is expressed as Fe 3+ The form exists; the concentration of SCOD in the liquid phase is 7280mg / L, the concentration of organic nitrogen is 390mg / L, the concentration of ammonia nitrogen is lower than 15mg / L, PO 4 3- The concentrat...

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Abstract

Belonging to the technical field of sewage treatment, the invention provides a ferrate-based excess activated sludge reduction and reclamation method. The method provided by the invention adopts a step-by-step technology to realize crushing of sludge aggregate first, maintains a complete bare environment of microbial cells, endows sludge with high hydrolysis and oxidation activity, enables quick release of organic matters in the sludge, and realizes methanation recovery, at the same time, microorganisms are utilized to reduce Fe<3+> obtained by ferrate oxidation into Fe<2+>, thus promoting theFe<2+> and PO4<3-> released from sludge to form vivianite; and secondly, ferrate is added to oxide microbial cells, thus realizing further reduction of sludge volume. Compared with one-time oxidation, the method provided by the invention avoids complete oxidation reaction of ferrate and organic matters released from sludge in the oxidation process, improves the oxidation efficiency of ferrate, and realizes reclamation of carbon and phosphorus elements in sludge. The method provided by the invention has the advantages of small ferrate dosage, high resource recovery rate and low treatment cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for reducing and recycling excess activated sludge based on ferrate. Background technique [0002] In recent years, with the rapid development of economy and technology, the scale and number of sewage treatment plants have been increasing. The amount of residual activated sludge produced by the biological treatment technology centered on microorganisms has also increased rapidly. Excess activated sludge contains a large amount of organic matter, nutrient elements and heavy metal ions. Discharging into the environment will produce stench, cause water eutrophication and soil pollution, and seriously affect human health. Because the extracellular polymer (EPS) in the sludge has a strong hydrophilic property, the water content in the remaining activated sludge reaches 97%. Generally speaking, the disposal fee of excess activated sludge accounts for about 60% of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04C02F101/30
Inventor 李祥黄勇马军
Owner SUZHOU UNIV OF SCI & TECH
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