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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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 with insufficient dilution will lead to an increase in the dosage of chemicals, and the chemicals cannot be mixed evenly, and the conditioning effect will also become poor.
Due to the above-mentioned differences in mud properties, the dilution degree of landfill sludge is based on the sludge concentration before deep dehydration in general sewage plants, which will lead to excessive dilution, resulting in poor conditioning effects and increased burden on dehydration liquid treatment.

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
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Effect test

Embodiment 1

[0039] see figure 1As shown in the process, the 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 15 g / L. mud. Carry out viscosity measurement to the diluted landfill sludge of above-mentioned concentration to obtain a viscosity curve, carry out viscosity measurement to the residual sludge (concentration is 52.1g / L) of the sewage plant that produces this landfill sludge to obtain a viscosity change interval, viscosity interval The relationship with the viscosity curve is as image 3 shown. Such as image 3 As shown, where the viscosity range 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 a concentration of 50.6g / L and 123.4g / L, respectively, with lime Dosing was 9.9% of the dry basis of the sludge, and ferric chloride was added as 4.6% of the dry basi...

Embodiment 2

[0042] Referring to the treatment process of Example 1, the effect of excessive dilution on the water content of the filter press mud cake was studied by performing an experiment of adding lime and ferric chloride at the same dosage to diluted landfill sludge with different concentrations. The diluted landfill sludge with a concentration of 90, 80, 70, 60, 50 and 40g / L was added with the same conditioning agent (lime 12%, ferric chloride 5.5%) based on the sludge dry basis, and then press-filtered experiment, the result of which is figure 2 shown. Depend on figure 2 It can be seen that under the same chemical dosage, when the concentration of the diluted sludge is 90g / L, the moisture content of the mud cake after conditioning and dehydration is 46.9%. As the degree of dilution increases, the water content of the mud cake increases continuously. When the dilution concentration was reduced to 40g / L, the moisture content of the mud cake after conditioning and dehydration was 5...

Embodiment 3

[0044] according to figure 1 The technological process for pretreatment of landfill sludge. Dilute 0.57 tons of landfill sludge with a moisture content of 80.8±0.7% with sludge dehydration liquid to a volume of 1m 3 The water content of the landfill sludge after the landfill is 90.6±0.3%. After adding conditioning agents to the diluted landfill sludge (9.9% of lime and 4.6% of ferric chloride on a dry basis), the sludge is dehydrated through a plate and frame filter press to obtain a mud cake and 0.7±0.01m 3 sludge dewatering solution. 0.43m of them 3 It is used for the dilution of landfill sludge, and the remaining dehydration liquid enters the leachate treatment system of the sewage plant for treatment. In this way, the dehydration liquid is used to dilute the landfill sludge 5 times and the moisture content of the conditioned mud cake is measured. It can be seen from Table 1 that under the same chemical dosage, the water content of the mud cake decreased as a whole wi...

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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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