Method for producing biological flocculant by using sewage treatment plant residual active sludge

A technology of sewage treatment plant and biological flocculant, which is applied in the field of sludge treatment and disposal, can solve problems such as affecting urban environmental sanitation and occupying land, and achieve the effect of high added value and good effect of resource utilization.

Inactive Publication Date: 2008-05-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of accumulated sludge will not only occupy land, but also become a major public hazard affecting urban environmental sanitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Raw material pretreatment. The remaining activated sludge from the sewage treatment plant is mixed with water to prepare a suspension, which is washed and passed through a 30-700 μm screen to remove sand, separated by a filter centrifuge, and the filtrate is discarded to obtain the washed desanding sludge. Prepare the washing and desanding sludge suspension according to the sludge concentration of 100g / L, according to Fe 3+ Add ferric sulfate at a content of 1.5mg / L, stir at room temperature for 3 days, separate through a filter centrifuge, discard the filtrate, and obtain purified sludge from which harmful heavy metals have been removed.

[0018] (2) The sludge cells are broken. The purified sludge suspension was prepared according to the sludge concentration of 100g / L, and the sludge cells were broken by pulsed ultrasonic irradiation with an ultrasonic frequency of 20kHz in an ice-water bath at normal pressure to obtain an extracted slurry.

[0019] (3) Solid-li...

Embodiment 2

[0022] (1) Raw material pretreatment. Adopt the method of embodiment 1 (1) to obtain washing desanding sludge. Use 0.25mol / L EDTA leachate to filter and wash to remove sand and dirt, and the total dose of leaching is 1000ml / kg. After being separated by a filter centrifuge, the filtrate is discarded to obtain purified sludge from which harmful heavy metals have been removed.

[0023] (2) The sludge cells are broken. Using a high-pressure homogenizer as equipment, add 1.5 times of water to the purified sludge and send it into the high-pressure homogenizer for high-pressure, circular crushing, and control the operating temperature below 50°C to obtain the extracted slurry.

[0024] (3) Solid-liquid separation of the extracted slurry. The extraction slurry is mixed with polyethylene glycol and inorganic salts in the extractor to prepare a two-phase extraction solution, and the phases are separated by a separate centrifuge. The upper phase is the crude microbial flocculant solut...

Embodiment 3

[0027] (1) Raw material pretreatment. Adopt the method of embodiment 1 (1) to obtain washing desanding sludge. Put the washing and desanding sludge into the electrokinetic reaction electrolyzer, and energize it for a sufficient time at a voltage of 20-40V, so that the heavy metals in the sludge area migrate to the cathode area for precipitation, and the purified sludge that removes harmful heavy metals is obtained.

[0028] (2) The sludge cells are broken. Using a high-speed bead mill as equipment, the purified sludge is mixed with polyethylene glycol and inorganic salts and then passed into the high-speed bead mill, where it is quickly stirred, ground and crushed with steel or glass beads or quartz sand with a diameter of less than 1mm. , the operating temperature is controlled below 50°C to obtain the extracted slurry.

[0029] (3) Solid-liquid separation of the extracted slurry. The extracted slurry is phase-separated by a separation centrifuge, the upper phase is the po...

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Abstract

The invention discloses a method to produce bio-flocculant from residual activated sludge of a sewage treatment plant, pertaining to sludge treatment and disposition technique field in environmental engineering. The method is characterized in that: the residual activated sludge of the sewage treatment plant is used as material which is pre-treated for preparing purified sludge, and the purified sludge is cell-disrupted for preparing extraction serosity, which is solid-liquid separated to respectively obtain rough microorganism flocculant solution and cell debris residues. The rough microorganism flocculant solution is post-treated to prepare the concentrate solution of the microorganism flocculant or an finished product of a solid microorganism flocculant, and the cell debris residues is post-treated to realize the zero discharge of the residual activated sludge. The effects and benefits of the invention are that: sludge is regarded as a resource to be effectively employed; compared with other recycling way of the residual activated sludge, the invention has comparatively high added value of resource utilization. The generated bio-flocculant has good effects for removing the turbidity, the organic substances and the heavy metals of waste water.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and disposal in environmental engineering, and relates to a method for producing a biological flocculant, in particular to a method for producing a biological flocculant by utilizing the remaining activated sludge of a sewage treatment plant. Background technique [0002] Excess activated sludge is an inevitable solid by-product of urban sewage treatment and wastewater treatment, with complex components. From the material properties can be divided into two categories: organic matter and inorganic matter. Organic matter mainly includes: microorganisms, organic matter adsorbed by microorganisms, products of microbial metabolic activities, flocculant (PAM) for sludge concentration and conditioning, etc. Inorganic substances mainly include: sand, salt and so on. According to the toxicity and environmental hazards of substances, they can be divided into three categories: toxic organic substa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 周集体王竞张爱丽金若菲曲媛媛吕红项学敏张劲松张玉
Owner DALIAN UNIV OF TECH
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