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A kind of deep dewatering pretreatment process of landfill sludge

A technology of deep dewatering and sewage treatment plant, which is applied in sludge treatment, water/sludge/sewage treatment, dewatering/drying/concentrated sludge treatment, etc., which can solve the problem of increasing treatment burden, increasing dewatering liquid treatment burden, and excessive dilution and other problems, to achieve the effect of reducing the amount of wastewater treatment, improving the utilization rate of chemicals, and overcoming the dosage of chemicals

Active Publication Date: 2022-07-15
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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  • A kind of deep dewatering pretreatment process of landfill sludge
  • A kind of deep dewatering pretreatment process of landfill sludge
  • A kind of deep dewatering pretreatment process of landfill sludge

Examples

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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% was 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. The viscosity of the above-mentioned diluted landfill sludge is measured to obtain a viscosity curve, and the viscosity of the excess sludge (concentration of 52.1g / L) of the sewage plant that produces the landfill sludge is measured to obtain a viscosity change interval, the viscosity interval The relationship with the viscosity curve is as image 3 shown. like image 3 As shown in Fig. 2, the viscosity interval overlaps with the viscosity curve of the diluted landfill sludge. It can be known that referring to the above example, the landfill sludge is also diluted to the concentration of 50.6g / L and 123.4g / L, respectively, and is also diluted with lime The addition of ferric chloride is 9.9% of the dry base of the sludge, and the addition of ferric c...

Embodiment 2

[0042] Referring to the treatment process of Example 1, the effect of excessive dilution on the moisture content of the filter press cake was studied by adding lime and ferric chloride at the same dosage to the diluted landfill sludge with different concentrations. Diluted landfill sludge with concentrations of 90, 80, 70, 60, 50 and 40g / L was subjected to the same conditioning agent addition (lime 12%, ferric chloride 5.5%) based on the sludge dry basis and then filter press experiments, the results of which are figure 2 shown. Depend on figure 2 It can be seen that under the same dosage of chemicals, when the concentration of the diluted sludge is 90g / L, the moisture content of the mud cake after conditioning and dehydration is 46.9%. With the increase of dilution degree, the moisture content of 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 52.8%. It shows...

Embodiment 3

[0044] according to figure 1 The process flow is used to pretreat landfill sludge. Dilute 0.57 tons of landfill sludge with a moisture content of 80.8±0.7% with sludge dewatering solution to a volume of 1m 3 The moisture content of the landfill sludge was 90.6±0.3%. After adding conditioning agents to the diluted landfill sludge (9.9% of lime and 4.6% of ferric chloride are added according to the dry base of the sludge), the sludge is deeply dewatered by a plate and frame filter press to obtain a mud cake. and 0.7±0.01m 3 sludge dewatering solution. Of which 0.43m 3 It is used for the dilution of landfill sludge, and the remaining dewatering liquid enters the leachate treatment system of the sewage treatment plant for treatment. In this way, the dewatering liquid is recycled 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 dosage of chemicals, with the increase of the n...

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Abstract

The invention relates to a deep dewatering pretreatment process for landfill sludge, comprising the following steps: (1) taking excess sludge from a sewage treatment plant for viscosity measurement to obtain a standard range of sludge viscosity; (2) based on step (1) The obtained sludge viscosity standard range, the sludge to be treated is diluted, and then its viscosity is measured, so that the viscosity of the diluted landfill sludge is within the sludge viscosity standard range and less than the maximum value of the sludge viscosity standard range. (3) Add chemical conditioning agent to the landfill sludge after dilution, conditioning, and then dewatering to obtain deep dewatering pretreated sludge with a moisture content lower than 60%, and recycling the sludge dewatering liquid for landfilling Sludge dilution. Compared with the prior art, the present invention effectively reduces the generation of dewatering liquid and maximizes the effect of chemicals by taking the sludge viscosity as the benchmark for the dilution degree of the landfill sludge, which fills the pretreatment technology before the landfill sludge conditioning. Field blank.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment in sludge landfills, and relates to a deep dewatering pretreatment process for landfill sludge. Background technique [0002] At present, the innocence, stabilization, reduction and resource treatment and disposal technologies of sludge have been widely studied. As a final disposal method, emergency sludge landfill can temporarily solve the problem of the whereabouts of excess sludge after dewatering. However, with the sludge landfill entering the mineralization period and the production of a large amount of new sludge, the mining and weight reduction treatment 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 high landfill age sludge suitable for secondary landfill or incineration is the key to solving the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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