A kind of treatment method for dilution, conditioning and solidification of non-standard disposal sludge

A treatment method and sludge technology, applied in sludge treatment, fixed/solidified sludge treatment, water/sludge/sewage treatment, etc., can solve difficult mixing, hinder cement hydration reaction, and reduce sludge solidification treatment Effect and other issues, to achieve the effect of improving efficiency, reducing sludge viscosity, and promoting fracture

Inactive Publication Date: 2019-08-06
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's investment in sludge treatment and disposal only accounts for 24-45% of the total investment in sewage treatment plants. Among the urban sewage treatment plants that have been built in my country, the application of sludge stabilization and disposal facilities in existing sewage treatment is less than 1 / 4, while less than 10% have relatively complete sludge treatment process and supporting equipment
However, cement-based dehydration and curing agents are usually mixed with sludge in the form of dry powder. For sludge with low moisture content and high viscosity, there is a technical bottleneck that it is difficult to fully mix and stir.
At the same time, the large molecular weight chain molecules in the sludge will hinder the cement hydration reaction, so that the insoluble crystals formed by the cement hydration reaction will be wrapped in the sludge colloidal structure in the form of particles, and the encapsulation of cement will not be realized. Reduced sludge solidification treatment effect

Method used

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  • A kind of treatment method for dilution, conditioning and solidification of non-standard disposal sludge
  • A kind of treatment method for dilution, conditioning and solidification of non-standard disposal sludge
  • A kind of treatment method for dilution, conditioning and solidification of non-standard disposal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 - Dehydration and solidification of sludge in an open-air storage pit of a waste landfill in Xi'an

[0042] (1) Preparation of aluminum-based gelling and curing agent

[0043] The laboratory preparation method adopts the falling cone method: grind the TNM1 type dehydration curing agent and sulfur-aluminum cement with a mass ratio of 3:7, pass through a 0.08mm sieve, mix and pile up into a cone shape, and then flatten it, and pile up the surrounding samples toward the center again After the cone is formed, it is flattened, and this is repeated several times to obtain a cement-based mixed dehydration curing agent;

[0044] Prepare 150 g of aluminum-based gelling and curing agent as described above.

[0045] (2) Solidification and modification treatment of sludge to be disposed of

[0046] The analysis results of the basic properties of the sludge to be disposed are shown in Table 1.

[0047] Table 1 Analysis results of basic properties of sludge

[0048] ...

Embodiment 2

[0054] Example 2 - Dehydration and solidification of sludge in an open-air storage pit of a waste landfill in Xi'an

[0055] (1) Preparation of aluminum-based gelling and curing agent

[0056] The laboratory preparation method adopts the falling cone method: grind the TNM1 type dehydration curing agent and sulfur-aluminum cement with a mass ratio of 1:5, pass through a 0.08mm sieve, mix and pile up into a cone shape, and then flatten it, pile up the surrounding samples toward the center again After the cone is formed, it is flattened, and this is repeated several times to obtain a cement-based mixed dehydration curing agent;

[0057] Prepare 150 g of aluminum-based gelling and curing agent as described above.

[0058] (2) Solidification and modification treatment of sludge to be disposed of

[0059] The analysis results of the basic properties of the sludge to be disposed are shown in Table 2.

[0060] Table 2 Analysis results of basic properties of sludge

[0061]

[0...

Embodiment 3

[0067] Example 3 - Dehydration and solidification of sludge in an open-air storage pit of a waste landfill in Xi'an

[0068] (1) Preparation of aluminum-based gelling and curing agent

[0069] The laboratory preparation method adopts the falling cone method: grind the TNM1 dehydration curing agent and sulfur-aluminum cement with a mass ratio of 2:6, pass through a 0.08mm sieve, mix and pile up into a conical shape, then flatten, and pile up the samples around the center again After the cone is formed, it is flattened, and this is repeated several times to obtain a cement-based mixed dehydration curing agent;

[0070] Prepare 150 g of aluminum-based gelling and curing agent as described above.

[0071] (2) Solidification and modification treatment of sludge to be disposed of

[0072] The analysis results of the basic properties of the sludge to be disposed are shown in Table 3.

[0073] Table 3 Analysis results of basic properties of sludge

[0074]

[0075] Take the 300...

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Abstract

The invention discloses a diluting and conditioning method for sludge. According to the method, sludge floc structures are damaged through oxidation; hydrophilic organic groups are damaged and transformed into free components; meanwhile the molecular weight of organic macromolecular substance in sludge can be further reduced through the oxidation of hydrogen peroxide, breakage of binding bonds among high polymer skeletons is promoted, further bound water, capillary water and cell bound water in sludge floc colloid structures are released, and sludge viscidity is effectively reduced. The method for treating sludge subjected to non-standardized treatment lies in that sludge is subjected to diluting and conditioning treatment through the method; a cement-based mixing dehydration curing agent is added for sufficient stirring; the sludge is subjected to stabilized curing after dehydration curing, thereby meeting the requirement of sanitary landfill. The invention further discloses a laboratory and an industrial preparation method of the cement-based mixing dehydration curing agent. The method is simple in technology and low in cost, expands environment restoration technological approaches of sludge open storage grounds, and has high economic, social and environment benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a treatment method for dilution, conditioning and solidification of non-standard disposal sludge. Background technique [0002] Since the late 1990s, with the rapid development of urbanization in our country and the increasing environmental pollution, the number of urban sewage treatment plants has continued to increase, and a large amount of urban sludge has also been produced. According to statistics from the Department of Urban Construction of the Ministry of Housing and Urban-Rural Development of my country, by the end of 2013, there were 1,736 sewage treatment plants in cities across the country, with a daily treatment capacity of 124.54 million cubic meters and a total annual urban sewage treatment volume of 38.19 billion cubic meters. The treatment rate is 89.34%. Based on the fact that 65% of the waste water in the country is treated by biological methods, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06C02F11/122
CPCC02F11/008C02F11/06C02F11/122
Inventor 柴晓利武博然张璐刘婉莹李德师
Owner TONGJI UNIV
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