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Modified activated sludge and application thereof

An activated sludge and modified technology, applied in sludge treatment, water/sludge/sewage treatment, water pollutants, etc. Pollution, large one-time investment and other problems, to achieve the effect of reducing capillary water absorption time, reducing filtration specific resistance, and improving dehydration performance

Active Publication Date: 2021-06-18
HANGZHOU NAXI ECOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain limiting factors in these disposal methods. For example, the landfill method needs to occupy a large amount of land, and the degradation process produces a large amount of waste gas and leachate, resulting in various toxic and harmful substances in the fill pit, which may easily cause the landfill site to explode or pass through the rainwater. The erosion and seepage of the sludge cause groundwater pollution, and the landfill disposal method is gradually decreasing; when the sludge is used as land, its toxic and harmful substances may also cause secondary pollution to the soil or water; Combustion operation costs are high, tail gas needs to be treated, and the one-time investment is large, resulting in its disposal cost being 2-4 times that of other disposal methods
It can be seen that the treatment rate of excess activated sludge is not high, and the treatment technology needs to be improved urgently. It is urgent to improve the treatment and disposal level and comprehensive utilization technology of excess activated sludge

Method used

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  • Modified activated sludge and application thereof
  • Modified activated sludge and application thereof
  • Modified activated sludge and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for modifying activated sludge, comprising:

[0045]S1: Add cattail powder to ferric chloride solution with a concentration of 10wt%, the dosage ratio of cattail powder and ferric chloride solution is 100mL:15g, shake and soak for 24h, filter, dry at 105°C for 2h, and then dry in N 2 Atmosphere, carbonization at 480°C for 4 hours, naturally cooled to room temperature, then washed with distilled water, and finally dried at 105°C for 2 hours to obtain iron-loaded cattail activated carbon;

[0046] S2: Add iron-loaded cattail activated carbon into the activated sludge, the dosage of iron-loaded cattail activated carbon in the activated sludge is 140mg / L, mix and stir for 4min, and dehydrate the filter cake at 105℃ Dry for 5 hours, grind through an 80-mesh sieve to obtain activated sludge particles;

[0047] S3: Add the activated sludge particles to a nitric acid solution with a concentration of 10wt% to acidify and modify for 6 hours. The ratio of acid solution t...

Embodiment 2

[0049] A method for modifying activated sludge, comprising:

[0050] S1: Add cattail powder to ferric chloride solution with a concentration of 8wt%, the dosage ratio of cattail powder and ferric chloride solution is 100mL:12g, shake and soak for 36h, filter, dry at 110°C for 1.5h, and then 2 Atmosphere, carbonization at 500°C for 5h, naturally cooled to room temperature, then washed with distilled water, and finally dried at 110°C for 1.5h to obtain iron-loaded cattail activated carbon;

[0051] S2: Add iron-loaded cattail activated carbon into the activated sludge, the dosage of iron-loaded cattail activated carbon in the activated sludge is 120mg / L, mix and stir for 2min, after dehydration by plate and frame filter press, filter cake at 110℃ Dry for 4 hours, grind through a 50-100 mesh sieve to obtain activated sludge particles;

[0052] S3: Add the activated sludge particles into the hydrochloric acid solution with a concentration of 8wt% to acidify and modify for 6 hours...

Embodiment 3

[0054] A method for modifying activated sludge, comprising:

[0055] S1: Add cattail powder to ferric chloride solution with a concentration of 14wt%, the dosage ratio of cattail powder and ferric chloride solution is 100mL:17g, shake and soak for 15h, filter, dry at 105°C for 2h, and then dry in N 2 Atmosphere, carbonization at 550°C for 3 hours, naturally cooled to room temperature, then washed with distilled water, and finally dried at 105°C for 2 hours to obtain iron-loaded cattail activated carbon;

[0056] S2: Add iron-loaded cattail activated carbon into the activated sludge, the dosage of iron-loaded cattail activated carbon in the activated sludge is 200mg / L, mix and stir for 5min, and dehydrate the filter cake at 105°C after dehydration by plate and frame filter press Dry for 5 hours, grind through a 100-mesh sieve to obtain activated sludge particles;

[0057] S3: Add the activated sludge particles to a sulfuric acid solution with a concentration of 15wt% to acidif...

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Abstract

The invention discloses modified activated sludge and application thereof, and belongs to the technical field of activated sludge. The modified activated sludge is obtained by the following method: carbonizing cattail powder soaked with a ferric chloride solution to obtain iron-loaded cattail activated carbon; treating the activated sludge by using the iron-loaded cattail activated carbon to obtain activated sludge particles; and modifying the activated sludge particles by using an acid solution to obtain the modified activated sludge, wherein the specific surface area of the modified activated sludge is 40-50 m<2> / g. The iron-loaded cattail active carbon prepared by the modification method has excellent adsorption performance; the iron-loaded cattail activated carbon is used for conditioning the activated sludge, so that the capillary water absorption time and the filtration specific resistance of the activated sludge can be effectively reduced, the dehydration performance of the activated sludge is improved, and the solid content of an activated sludge filter cake is increased while the suction filtration time is reduced; and the modified activated sludge disclosed by the invention has relatively high adsorption capacity on heavy metal ions and antibiotics.

Description

technical field [0001] The invention belongs to the technical field of activated sludge, and in particular relates to a modified activated sludge and its application. Background technique [0002] The sewage produced and discharged by human life and industrial production must be treated up to the standard before it can be discharged into natural water bodies. There are many methods of sewage treatment, among which activated sludge method is the most widely used mainstream technology for sewage biochemical treatment, and activated sludge method Residual activated sludge will be generated during sewage treatment, and its volume accounts for about 0.3%-0.5% of the treated water volume. If the wastewater is further treated, the sludge volume may increase by 0.5-1 times. Although different sources of sewage produce activated sludge with different compositions and properties, most of the remaining activated sludge discharged from it contains heavy metals, pathogenic bacteria, viru...

Claims

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Application Information

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IPC IPC(8): C02F11/148C02F11/121C02F11/122B01J20/20B01J20/30C02F1/28C02F101/30C02F101/20
CPCC02F11/148C02F11/121C02F11/122B01J20/20B01J20/0229B01J20/0244C02F1/288C02F2101/30C02F2101/20
Inventor 徐坚麟付源张素王振娥邱正庚
Owner HANGZHOU NAXI ECOLOGICAL TECH CO LTD
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