Deep dehydration pretreatment process for landfill sludge

A technology for deep dehydration and sewage treatment plants, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. Deal with problems such as increased burden, and achieve the effect of overcoming the limitations of chemical dosing, improving the utilization rate of chemical, and reducing the amount of wastewater treatment

Active Publication Date: 2019-03-19
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Application Information

AI Technical Summary

Problems solved by technology

Under the same dosage based on dry sludge (mg/gDS), the water content of the landfill sludge cake filtered out by pressure filtration increases with the decrease of the concentration (see attached figure 2 shown), showing a poor conditioning effect
It shows that the over-diluted landfill sludge will lead to the dilution of the chemical effect, and at the same time, too much sludge dewatering liquid will be produced, which will increase the burden of treatment
However, landfill sludge

Method used

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  • Deep dehydration pretreatment process for landfill sludge
  • Deep dehydration pretreatment process for landfill sludge
  • Deep dehydration pretreatment process for landfill sludge

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] See figure 1 In the process shown, landfill sludge with a moisture content of 81.2% is diluted to obtain diluted sludge with concentrations of 135, 125, 115, 105, 95, 85, 75, 65, 55, 45, 35, 25 and 15g / L. mud. Viscosity measurement of the above-mentioned diluted landfill sludge is performed to obtain a viscosity curve. Viscosity measurement is performed on the remaining sludge (concentration of 52.1g / L) of the sewage treatment plant that produces the landfill sludge to obtain a viscosity change interval. The relationship with the viscosity curve is as image 3 Shown. Such as image 3 As shown, where the viscosity interval overlaps with the viscosity curve of the diluted landfill sludge, it can be known that referring to the above examples, the landfill sludge is also diluted to concentrations of 50.6g / L and 123.4g / L and then lime The dosage is 9.9% of the dry sludge basis, and the ferric chloride dosage is 4.6% of the dry sludge basis. After treatme...

Example Embodiment

[0041] Example 2

[0042] With reference to the treatment process of Example 1, the impact of over-dilution on the moisture content of the filter press cake was studied by conducting the dosing experiment of lime and ferric chloride at the same dosage on the diluted landfill sludge with different concentrations. Apply the same conditioning agent (lime 12%, ferric chloride 5.5%) to the diluted landfill sludge with a concentration of 90, 80, 70, 60, 50 and 40g / L based on the dry sludge, and then press filter Experiment, the results are as figure 2 Shown. by figure 2 It can be seen that under the same dosage of medicament, when the concentration of the diluted sludge is 90g / L, the moisture content of the mud cake after conditioning and dewatering is 46.9%. As the degree of dilution increases, the moisture content of the mud cake continues to increase. When the dilution concentration is reduced to 40g / L, the moisture content of the mud cake after conditioning and dehydration is 52....

Example Embodiment

[0043] Example 3

[0044] press figure 1 The process of pretreatment of landfill sludge. Use sludge dewatering liquid to dilute 0.57 tons of landfill sludge with a moisture content of 80.8±0.7% to a volume of 1m 3 The water content of the landfill sludge afterwards is 90.6±0.3%. After the diluted landfill sludge is added with conditioning agents (the lime added on the dry basis of the sludge is 9.9%, ferric chloride is 4.6%), the sludge is deeply dewatered by a plate and frame filter press to obtain a mud cake And 0.7±0.01m 3 The sludge dehydration liquid. Of which 0.43m 3 It is used for the dilution of landfill sludge, and the remaining dehydrated liquid enters the leachate treatment system of the sewage treatment plant for processing. In this way, the landfill sludge is diluted 5 times with the dehydrated liquid and the moisture content of the conditioned mud cake is measured. It can be seen from Table 1 that under the same dosage of medicament, with the increase of the numb...

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Abstract

The invention relates to a deep dehydration pretreatment process for landfill sludge. The deep dehydration pretreatment process comprises the following steps of (1) performing viscosity measurement onexcess sludge of a sewage treatment plant to obtain a sludge viscosity standard range; (2) diluting to-be-treated landfill sludge based on the sludge viscosity standard range obtained in step (1), then measuring the viscosity of the to-be-treated landfill sludge so that the viscosity of the diluted landfill sludge is within the sludge viscosity standard range and is smaller than a maximum value of the sludge viscosity standard range; and (3) adding a chemical conditioning agent to the diluted landfill sludge, conditioning and then dehydrating the diluted landfill sludge to obtain the deep dehydration pretreatment sludge having a water content of less than 60%, and recycling the sludge dehydration liquid for diluting the landfill sludge. Compared with the prior art, the deep dehydration pretreatment process for the landfill sludge effectively reduces the generation of the dehydration liquid and maximizes the effect of the medicament by using the sludge viscosity as a reference for thelandfill sludge dilution degree, and fills in the gap of the technical field of pretreatment before conditioning of the landfill sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment in sludge landfills, and relates to a deep dehydration pretreatment process for landfill sludge. Background technique [0002] At present, the harmless, stabilization, reduction and resource treatment and disposal technologies of sludge have been extensively studied. As a final disposal method, sludge emergency landfill can temporarily solve the problem of the whereabouts of excess sludge after dehydration. However, as the sludge landfill enters the mineralization period and a large amount of new sludge is produced, the mining and reduction of landfill sludge has become an urgent problem to be solved. Landfill mining means that mineralized sludge with high landfill age has become a new research object. Improving the corresponding sludge conditioning technology to make sludge with high landfill age suitable for secondary landfill or incineration is the key to solving the problem. [0003...

Claims

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Application Information

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IPC IPC(8): C02F11/143C02F11/122
CPCC02F11/122C02F11/14
Inventor 周振吴炜杨家哲王凯冲叶小芳孙东奇袁瑶赵晓丹
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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