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A sludge desanding method and system for adjusting pH value step by step

A step-by-step adjustment and sludge technology, applied in the fields of sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the wear and tear of sludge treatment equipment, the difficulty of effectively increasing the organic matter content, energy consumption and cost problems such as large, to achieve the effect of improving utilization, reducing interference, and improving efficiency

Active Publication Date: 2021-09-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the current problems that the fine sand in the sludge is difficult to effectively remove, the content of organic matter is difficult to effectively increase, the volume utilization rate of each treatment system is low, the sludge treatment equipment is seriously worn, and the energy consumption and cost are large. A sludge desanding method and system for adjusting the pH value step by step, which can realize the effective removal of fine sand in the sludge, the effective increase of organic matter content, and improve the volume utilization of anaerobic digestion system, aerobic fermentation system and incineration system, etc. efficiency, reduce the wear and tear of sludge treatment equipment, and reduce the energy consumption and cost of sludge treatment and disposal

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  • A sludge desanding method and system for adjusting pH value step by step

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Effect test

Embodiment 1

[0049] A sludge desanding method and system for adjusting the pH value step by step, such as figure 1 , including the tempering unit, the first-stage sand settling unit and the second-stage cyclone desanding unit, the steps are as follows:

[0050] (1) Add sandy sludge with volatile solids to total solids ratio (VS / TS) of 55% and a water content of 99% into the conditioning unit, and add NaOH step by step to adjust the pH value. Add the surfactant sophorolipid at 5‰, and stir for 10 minutes at 50 r / min for every 0.3 rise in the pH value until the pH rises to 10.

[0051] (2) The effective volume ratio of the first-stage sand settling unit and the conditioning unit is 1:1, pump 1 / 2 of the sludge volume after adjusting the pH value in the conditioning unit into the first-stage sand settling unit, and the first-stage sand settling unit The volume ratio of the primary sand settling area to the stirring and sedimentation area in the unit is 3:1, the length of the stirring paddle i...

Embodiment 2

[0054] A sludge desanding method and system for adjusting pH value step by step, comprising a conditioning unit, a primary desanding unit and a secondary cyclone desanding unit. Proceed as follows:

[0055] (1) Add sandy sludge with a volatile solid to total solid ratio (VS / TS) of 40% and a water content of 96% into the conditioning unit, and add NaOH step by step to adjust the pH value, so that the dry weight of the sludge is Add surfactant rhamnolipid at 10‰, and stir for 5 minutes at 100 r / min for every 0.5 rise in pH value until the pH rises to 10.

[0056] (2) The effective volume ratio of the first-stage sand settling unit and the conditioning unit is 2:1, pump 1 / 4 of the sludge volume after adjusting the pH value in the conditioning unit into the first-stage sand settling unit, and the first-stage sand settling unit The volume ratio of the primary sand settling area to the stirring and sedimentation area in the unit is 5:1, the length of the stirring paddle in the prim...

Embodiment 3

[0059] A sludge desanding method and system for adjusting pH value step by step, comprising a conditioning unit, a primary desanding unit and a secondary cyclone desanding unit. Proceed as follows:

[0060] (1) Add sandy sludge with a volatile solid to total solid ratio (VS / TS) of 35% and a moisture content of 98% into the conditioning unit, and add NaOH step by step to adjust the pH value, so that the dry weight of the sludge is 8‰ Add surfactant phospholipids, and stir for 5 minutes at 80r / min for every 0.5 rise in pH value until the pH rises to 10.

[0061] (2) The effective volume ratio of the first-stage sand settling unit and the conditioning unit is 2:1, and 1 / 3 of the sludge volume after adjusting the pH value in the conditioning unit is pumped into the first-stage sand settling unit, and the first-stage sand settling unit The volume ratio of the primary sand settling area to the stirring and sedimentation area in the unit is 4:1, the length of the stirring paddle in ...

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Abstract

The invention relates to a sludge desanding method and system for adjusting pH value step by step. The sand-containing sludge after adjusting the pH value is pumped into the first-stage sand settling unit, and the mud and sand are separated at the first stage to obtain the first-stage desanding sludge A and high-sandy sludge A; the high-sandy sludge A is pumped into the secondary cyclone In the desanding unit, the sediment is separated in two stages to obtain sludge B with high organic matter and sludge B with high sand content. Compared with the prior art, the present invention realizes the effective removal of fine sand in the sludge, the effective increase of the organic matter content, improves the volume utilization rate of the anaerobic digestion system, the aerobic fermentation system and the incineration system, etc., and reduces the sludge treatment equipment. Wear and tear, reduce energy consumption and cost of sludge treatment and disposal.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a sludge desanding method and system for adjusting pH value step by step. Background technique [0002] Due to the common problems of rain and sewage mixed connection and groundwater leakage in urban drainage pipe networks in my country, especially in southern regions; circular grit chambers are generally used in sewage treatment plants, and the desanding efficiency is low; a large number of infrastructure, construction Construction, so that mud and sand water is discharged into the sewage pipe network system, etc., the content of fine sand in the sludge in my country is significantly higher than that in developed countries (20-40% in developed countries, while 50-70% in my country). The higher sand content first affects the subsequent treatment and disposal efficiency of sludge. For example, the sand content in sludge increases the volume of sludge significantly, reducin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
CPCC02F11/00
Inventor 陈思思高君陈仁杰肖婷婷董滨
Owner TONGJI UNIV
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