Deep dewatering method for sludge

A deep dehydration and sludge technology, which is applied in the field of agricultural and forestry waste recycling, can solve the problems of high water content of mud cake, low dehydration performance, high heavy metal content, etc., achieve low heavy metal leaching content, improve permeability, and low operating cost Effect

Inactive Publication Date: 2019-04-12
肇庆市珈旺环境技术研究院
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Problems solved by technology

[0010] Aiming at the current problems of low sludge dehydration performance, high water content of mud cake and high content of heavy metals in water removal, the purpose of the present invention is to provide a deep sludge dehydration method, through active oxidation and bioactivation of persulfate The substance is used as a skeleton structure to compound and condition sludge, enhance the strength of sludge flocs, improve the compressibility of sludge, significantly improve the dewatering performance of sludge, and stabilize and passivate heavy metals in sludge

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Embodiment 1

[0031] A sludge deep dewatering technology of the present invention, the raw materials are as follows: sludge, ferrous sulfate, sodium persulfate, rice husk and water. Its conditioning steps are as follows:

[0032] (1) put the dried rice husk into a ball mill and grind for 10 minutes at a speed of 3500r / min, and dry to obtain rice husk powder;

[0033] (2) passing the rice husk powder through a square hole sieve to obtain rice husk powder with a particle size of 0.075-0.15mm;

[0034] (3) Under 25 ℃, add the sodium persulfate of 15.2wt% sludge dry weight, stir 5min, then add the Fe of 4.6wt% sludge dry weight 2+ , control the solid-liquid ratio 1:10, stir for 10 minutes;

[0035] (4) Add rice husk powder with 33.3wt% sludge dry weight, and stir for 10min at 25°C;

[0036] (5) The sludge enters the plate and frame filter press for 0.5h to obtain a mud cake.

[0037] After testing, the moisture content of the mud cake was 48%.

Embodiment 2

[0039] A sludge deep dewatering technology of the present invention, the raw materials are as follows: sludge, ferrous sulfate, potassium persulfate (SPS), rice husk and water. Its conditioning steps are as follows:

[0040](1) put the dried rice husk into a ball mill and grind for 10 minutes at a speed of 3500r / min, and dry to obtain rice husk powder;

[0041] (2) passing the rice husk powder through a square hole sieve to obtain rice husk powder with a particle size of 0.075-0.15mm;

[0042] (3) Under 52 ℃, add the potassium persulfate of 15.2wt% sludge dry weight, stir 5min, then add the Fe of 4.6wt% sludge dry weight 2+ , control the solid-liquid ratio 1:10, stir for 10 minutes;

[0043] (4) Add rice husk powder with 33.3wt% sludge dry weight, and stir for 10min at 52°C;

[0044] (5) The sludge enters the plate and frame filter press for 0.5h to obtain a mud cake.

[0045] After testing, the moisture content of the mud cake was 42%.

Embodiment 3

[0047] The sludge deep dewatering technology of the present invention comprises the following raw materials: sludge, ferrous sulfate, potassium persulfate, rice husk and water. Its conditioning steps are as follows:

[0048] (1) put the dried rice husk into a ball mill and grind for 10 minutes at a speed of 3500r / min, and dry to obtain rice husk powder;

[0049] (2) passing the rice husk powder through a square hole sieve to obtain rice husk powder with a particle size of 0.075-0.15 mm;

[0050] (3) Under 80 ℃, add the potassium persulfate of 15.2wt% sludge dry weight, stir 5min, then add the Fe of 4.6wt% sludge dry weight 2+ , control the solid-liquid ratio 1:10, stir for 10 minutes;

[0051] (4) Add rice husk powder with 33.3wt% sludge dry weight, and stir for 10min at 80°C;

[0052] (5) The sludge enters the plate and frame filter press for 0.5h to obtain a mud cake.

[0053] After testing, the moisture content of the mud cake was 45%.

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Abstract

The invention discloses a deep dewatering method for sludge. Persulfate, soluble bivalent iron salt and biomass are successively added to the sludge, and a mud cake is obtained by pressure filtrationafter full reaction. The sludge is compounded and conditioned by activated persulfate oxidation and the biomass as a skeleton structure to enhance the strength of sludge flocs, improve the compressibility of the sludge, significantly improve the dewatering performance of the sludge and simultaneously stabilize and deactivate heavy metals in the sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge dehydration, relates to activated persulfate advanced oxidation and biomass composite conditioning, develops a new skeleton construct to regulate sludge performance, realizes deep dehydration and reduction of sludge, and also relates to resource utilization of agricultural and forestry waste . Background technique [0002] The composition of sludge is complex and contains a large amount of polluting components. If it is not handled properly, it will easily cause secondary pollution to the environment. For example, the sludge contains pathogenic bacteria such as Escherichia coli, which will easily lead to the spread of diseases and endanger environmental safety and human health. Good health; sludge contains traces of refractory organic substances such as polycyclic aromatic hydrocarbons, herbicides, pesticides, PCBs, and surfactants, which will enter the food chain through migration and transformati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/122
CPCC02F11/122C02F11/14
Inventor 侯浩波刘石香熊巧张炎李政家雷杰妮
Owner 肇庆市珈旺环境技术研究院
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