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Preparation of rice husk powder conditioning sludge incineration slag and method for conditioning urban sludge

A sludge incineration and municipal sludge technology, applied in the field of environmental treatment, can solve the problems of poor dewatering performance of the original sludge, high capital and time investment, long sludge drying time, etc., and achieves reduced cost and difficulty and practicality. Strong, improving dehydration effect

Inactive Publication Date: 2016-06-08
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on the use of sludge incineration slag to condition sludge. Luo Haijian et al. studied the effect of sludge incineration bottom slag on the dewatering performance of industrial sludge. Dehydration performance
Existing studies all use raw sludge incineration bottom slag for research. Due to poor dehydration performance of raw sludge, long sludge drying time, high energy consumption cost, and low calorific value of raw sludge, sludge incineration Need to consume a certain amount of combustion aid, so the preparation of raw sludge incineration slag requires high capital and time investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take a certain amount of original sludge, add rice husk powder with 65% sludge dry weight, and stir at 350rpm for 30s;

[0023] (2) Under the stirring condition of 40rpm, continue to add ferric chloride of 138.09g / kg sludge dry weight to the above sludge, and stir for 3min;

[0024] (3) filtering and dehydrating the conditioned sludge, and drying the obtained sludge cake at 105°C;

[0025] (4) Incinerate the dried sludge cake at 400°C for 1 hour;

[0026] (5) Grinding and sieving the residual solid after incineration after natural cooling to obtain the rice husk powder conditioning sludge

[0027] Incineration slag, rice husk powder conditioning sludge incineration slag size is 80-250μm.

[0028] The rice husk powder prepared in Example 1 was used to condition the sludge incineration slag to carry out the sludge conditioning in the following 2-4.

Embodiment 2

[0029] Embodiment 2: Get a certain amount of former sludge, add rice husk powder conditioning sludge incineration slag prepared in Example 1 of 68% sludge dry weight, and carry out sludge conditioning, stir with 350rpm for 30s; continue in the above sludge Add 138.09g / kg of ferric chloride of sludge dry weight, stir at 40rpm for 3min; then filter and dehydrate the conditioned sludge. The results obtained are as follows: the specific resistance of the original sludge is 1.20×10 13 m / kg, the net yield of sludge is 1.94kg / (m 2 h), the specific resistance of the sludge after adding ferric chloride is 1.51×10 12 m / kg, the net yield of sludge is 18.99kg / (m 2 h), the specific resistance of the sludge conditioned by rice husk powder conditioning sludge incineration slag decreased to 5.45 × 10 11 m / kg, the sludge net yield rose to 26.27kg / (m 2 h), the moisture content of the filter cake dropped from the original 92.71% to 72.9%.

Embodiment 3

[0030] Embodiment 3: Get a certain amount of original sludge, add rice husk powder conditioning sludge incineration slag prepared in Example 1 of 70% sludge dry weight, and carry out sludge conditioning, stir with 350rpm for 30s; continue in the above sludge Add 138.09g / kg of ferric chloride of sludge dry weight, stir at 40rpm for 3min; then filter and dehydrate the conditioned sludge. The obtained results are as follows: the specific resistance of the original sludge is 1.75×10 13 m / kg, the net yield of sludge is 1.47kg / (m 2 h), the specific resistance of the sludge after adding ferric chloride is 1.46×10 12 m / kg, the net yield of sludge is 14.18kg / (m 2 h), the specific resistance of the sludge conditioned by rice husk powder conditioning sludge incineration slag decreased to 4.87 × 10 11 m / kg, the sludge net yield rose to 21.60kg / (m 2 h). The water content of filter cake dropped from 93.88% to 71.17%.

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Abstract

The invention discloses a preparation method of rice husk powder conditioning sludge incineration slag and a method for conditioning urban sludge and belongs to the technical field of environmental governance. The method comprises the following steps: dosing a certain amount of rice husk powder and iron chloride into a certain amount of urban sludge according to a certain dosing sequence and stirring speed; filtering and dehydrating the sludge after conditioning to obtain a sludge cake; incinerating the sludge cake at a certain temperature for a certain time to prepare the rice husk powder conditioning sludge incineration slag; and conditioning the urban sludge by using the prepared rice husk powder conditioning sludge incineration slag to improve the dehydration performance. By adopting the preparation method of the rice husk powder conditioning sludge incineration slag, disclosed by the invention, preparation time and energy consumption are effectively saved; and meanwhile, the rice husk powder conditioning sludge incineration slag can obviously improve the dehydration performance of the sludge, and the water content in the dehydrated sludge cake reaches 70-75%. The preparation method disclosed by the invention has the advantages of low cost and simple process, and has important significance for solving environmental pollution and promoting the treatment of wastes by other wastes.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for preparing sludge incineration slag after conditioning rice husk powder and conditioning urban sludge. Background technique [0002] Due to its high yield, large volume, complex nature and hazards to the environment and human health, municipal sludge must be treated and disposed of. The most notable feature of sludge is that it has a high water content (up to 99%), loose floc structure and a flowing state, which brings economic and technical difficulties to the long-distance transportation and subsequent treatment of sludge, so it is effective Dewatering is the key to sludge treatment. However, as a highly plastic fluid, excess sludge has extremely poor compressibility, and the moisture content of sludge is still above 90% after direct dehydration. Sludge conditioning promotes sludge dehydration by improving sludge dewatering performance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/14
Inventor 张盼月吴彦彭猛曾光明张海波刘建波夏亚平叶捷房玮晏铭
Owner HUNAN UNIV
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