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A kind of curing agent for attapulgite enhanced printing and dyeing sludge treatment and disposal and its curing method

A technology for attapulgite and printing and dyeing sludge, which is applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of low mechanical strength of sludge solidified body and high leaching concentration of pollutants, and achieves good generalizability and practicability , Good fixation effect and low cost components

Active Publication Date: 2017-02-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an attapulgite for strengthening the treatment and disposal of printing and dyeing sludge in order to solve the problems of long sludge disposal time, low mechanical strength of sludge solidification body, and high pollutant leaching concentration in the existing printing and dyeing sludge solidification and stabilization treatment process. The curing agent and its curing method, the invention improves the geotechnical performance of the sludge from the printing and dyeing factory, improves the mechanical strength of the solidified sludge, reduces the leaching ability of pollutants, and facilitates the sanitary landfill and resource utilization of the sludge

Method used

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  • A kind of curing agent for attapulgite enhanced printing and dyeing sludge treatment and disposal and its curing method

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Embodiment 1

[0030] An attapulgite-enhanced solidifying agent for treatment and disposal of printing and dyeing sludge in this embodiment includes composite additives and attapulgite, and the composite additives include cement, fly ash and calcium chloride. According to the sludge moisture content, organic matter content and heavy metal content and the application purpose of sludge solidification, combined with the design software design expert8.0.6, after creating a new task, select the Optimal type in the mixture tab, set the number of components and the maximum and minimum of each component value. After selecting the response index, determine the proportion of each component contained in the composite additive and the addition ratio of the composite additive and attapulgite. In view of the fact that the solidified printing and dyeing sludge obtained in this embodiment is mainly used for sanitary landfill. The mass ratio of cement, fly ash and calcium chloride in the composite additive ...

Embodiment 2

[0035] In this example, the composite additive is first mixed according to cement: fly ash: calcium chloride = 1:0:0, and then the components are mixed according to printing and dyeing sludge: attapulgite: composite additive = 0.433:0.133:0.433 solidified. Add 133g of attapulgite and 433g of cement to 433g of printing and dyeing sludge according to the above ratio, and mix evenly. Put it into a 70.7mm×70.7mm×70.7mm mold at room temperature for 24 hours and mold it. After demolding and curing for 28 days, the unconfined compressive strength of the cured block reaches 3.0MPa. Meet the compressive strength requirements for soil base and road construction bricks in Evaluation of physical stability and leachability of Portland Pozzolona Cement (PPC) solidified chemical sludge generated from textile wastewater treatment plants, Journal of Hazardous Materials 207:56-64 published by Patel. XRD results show that quartz and calcite are the main components, and figure 1 similar. Adopt...

Embodiment 3

[0037] A kind of attapulgite reinforced printing and dyeing sludge curing agent and its curing method of this embodiment are basically the same as embodiment 1, the difference is: in this embodiment cement: fly ash: calcium chloride=6 : 0: 0.18, printing and dyeing sludge: attapulgite: composite additive = 0.1: 0.05: 0.3.

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Abstract

The invention discloses curing agent for attapulgite reinforced printing and dyeing sludge treatment and a curing method thereof and belongs to the technical field of printing and dyeing sludge treatment. The mass ratio of attapulgite and a composite additive in the curing agent is (0.05-0.3): (0.3-1.2). The mass ratio of cement, coal ash and calcium chloride in the composite additive is (1-6): (0-5): (0-0.18). The curing method comprises the following steps: (1) determining the adding proportion of the composite additive and attapulgite; (2) crushing and grinding the composite additive and attapulgite and sieving by a 35-mesh sieve; (3) uniformly mixing the printing and dyeing sludge, attapulgite and the composite additive; and (4) packing the stirring product in a die in layers, demoulding in one day and maintaining for 1-28 days at room temperature. The curing agent disclosed by the invention is used for improving the geotechnical property of factory sludge in a printing and dyeing plant, so that the mechanical strength of cured sludge is improved and the leaching ability of pollutants is reduced. Sanitary landfill and resource utilization of sludge are facilitated.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control terminals and safe disposal of solid waste, more specifically, to a curing agent component in the treatment and disposal of printing and dyeing sludge, and a method for using the curing agent to finally dispose of printing and dyeing sludge. Background technique [0002] Printing and dyeing wastewater is one of the typical difficult-to-treat industrial wastewater. Its treatment process usually adopts physicochemical and biochemical treatment processes, and a large amount of sludge will be generated during the treatment process. Because printing and dyeing wastewater contains a large amount of complex and refractory substances such as dyes, auxiliaries, sizing materials, and heavy metals, printing and dyeing sludge has complex, special, and difficult-to-treat characteristics. [0003] Sludge usually has treatment methods such as incineration, composting, landfill, and resour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C04B28/00C04B14/10
Inventor 任洪强张瑞丁丽丽耿金菊
Owner NANJING UNIV
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