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Method for removing phosphorus from town sewage by recycling waste sludge of water supply plant

A technology for urban sewage and waste mud, applied in water/sludge/sewage treatment, water/sewage multi-stage treatment, adsorbed water/sewage treatment, etc., can solve the problem of removal rate of only 10-30%, and reduce disposal Cost, low cost, easy to obtain effects

Inactive Publication Date: 2013-11-27
BEIJING NORMAL UNIVERSITY
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  • Summary
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  • Claims
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Problems solved by technology

In the traditional biological treatment process, there is a contradiction between carbon source competition in the process of biological denitrification and phosphorus removal, and the removal rate of total phosphorus is only 10-30%.

Method used

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  • Method for removing phosphorus from town sewage by recycling waste sludge of water supply plant
  • Method for removing phosphorus from town sewage by recycling waste sludge of water supply plant
  • Method for removing phosphorus from town sewage by recycling waste sludge of water supply plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using waste sludge from a water supply plant as raw material, the contents of iron and aluminum in the waste sludge are 133 and 98mg / L respectively, and the surface area is 56.11m 2 / g. The waste sludge from the water supply plant was naturally air-dried, crushed, ground and mixed to obtain a powder adsorbent with a particle size of 0.18 mm.

[0024] Urban sewage is taken from three sewage treatment plants with phosphorus concentrations of 5, 10 and 20 mg / L respectively.

[0025] according to figure 1 Set up three CSTR devices, choose urban sewage with a phosphorus concentration of 10mg / L as the influent water, add 5g / L of waste sludge to the water supply plant, adjust the influent flow rate to control the hydraulic retention time to 1, 2 and 3h respectively, and run Measure the phosphorus concentration in the water in the sedimentation zone every 10 minutes within 5 hours.

[0026] like figure 2 As shown, the phosphorus concentration in the effluent at all hydraul...

Embodiment 2

[0028] according to figure 1 Set up three CSTR devices, choose urban sewage with a phosphorus concentration of 10mg / L as influent water, control the residence time of 2h, add different amounts of waste sludge from water supply plants (2, 5, 10g / L), and run within 5h Measure the phosphorus concentration in the water in the sedimentation zone every 10 minutes.

[0029] like image 3 , the concentration of phosphorus in the effluent decreased rapidly at the beginning of all dosages, and then gradually reached equilibrium. The dosage increased from 2 to 10g / L, and the phosphorus removal rate increased from 52.6% to 94.7%. The results show that the phosphorus removal rate of the present invention can be significantly improved by increasing the dosage of waste sludge from water supply plants.

Embodiment 3

[0031] according to figure 1 Set up three CSTR devices, select urban sewage with a phosphorus concentration of 5, 10 and 20 mg / L as influent water, control the hydraulic retention time of the CSTR device to 2 hours, and add 5 g / L of waste sludge to the water plant. Within 5 hours of operation, every Measure the phosphorus concentration in the water in the sedimentation zone every 10 minutes.

[0032] like Figure 4 , the phosphorus concentration in the effluent at all phosphorus concentrations decreased rapidly at the beginning, and then gradually reached equilibrium. The influent phosphorus concentrations were 5, 10 and 20mg / L, and the phosphorus removal rates were 91%, 75% and 68%, respectively. Therefore, the present invention also has better removal efficiency for high-concentration urban sewage.

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Abstract

The invention discloses a method for removing phosphorus from town sewage by recycling waste sludge of a water supply plant, belonging to the technical field of sewage treatment. The method is characterized in that the waste sludge is dried, crushed, ground and uniformly mixed and then is used as an adsorbent which is added into a continuous stirring reaction kettle provided with an automatic dosing device, and sewage continuously flows into a reaction tank from a water inlet tank, then enters a sedimentation tank after a certain period of hydraulic residence time, is subjected to solid-liquid separation and finally is discharged out of the system. The removal efficiency of the method is improved along with the increase of the hydraulic residence time and the dosage of the waste sludge of the water supply plant, so that the method has very good phosphorus removal efficiency for the town sewages with different phosphorus concentrations. The waste sludge of the water supply plant is low in cost and nontoxic, and the method is combined with a simple continuous stirring reaction kettle of a process, so that the difficulty of blockage of an adsorption column is overcome, the treatment cost of wastes is reduced, the internal resource circulation of a town is promoted, and the method is favorable for reaching a goal of 'treatment of wastes with processes of wastes against one another'.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for removing phosphorus in urban sewage by using waste mud from a water supply plant as a raw material to realize resource recycling. Background technique [0002] Eutrophication of water body is a global problem, and nutrient salt in urban sewage is one of the important sources of eutrophication in natural water body. In the traditional biological treatment process, there is a contradiction between carbon source competition in the process of biological denitrification and phosphorus removal, and the removal rate of total phosphorus is only 10-30%. Therefore, various chemical methods are commonly used for deep phosphorus removal to make the effluent meet discharge standards. At present, the commonly used chemical phosphorus removal methods include chemical coagulation, chemical precipitation, ion exchange and adsorption. [0003] The mechanism of t...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F9/02
Inventor 裴元生白雷雷王昌辉
Owner BEIJING NORMAL UNIVERSITY
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