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A method for co-processing excess sludge with ore washing mud

A technology of surplus sludge and co-processing, which is applied in the direction of pyrolysis sludge treatment, sludge treatment, mining wastewater treatment, etc., can solve the problems of low fertility and soil structure damage, and achieve simple operation, good economic benefits, and benefit The effect of promotional use

Active Publication Date: 2021-11-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in addition to the high content of heavy metals in the surface covering soil, soil structure damage and low fertility are also major constraints

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] (1) The excess sludge and rice straw were mixed according to the mass ratio of 3:10, and then the mixed excess sludge and rice straw were heated to 500 °C in the reactor and maintained at a constant temperature for 8 h, and finally Dry in an oven at 90 °C to obtain residual sludge biochar.

[0013] (2) Add 50 g of the remaining sludge biochar prepared in step (1) to each liter of washing sludge, stir evenly, and pump it into a filter press for dehydration through a sludge pump to control the dehydration of the washing sludge after dehydration. The water content is 50%, and the dehydrated washing slime is obtained.

[0014] (3) Perform aerobic composting of the dehydrated ore washing sludge and the remaining sludge prepared in step (2) at a ratio of 0.5:1 by volume, and mature the remaining sludge by controlling the temperature of the pile at 45°C, and The washing sludge is further dehydrated to obtain sludge compost.

[0015] (4) Mix the dewatered washing sludge obtai...

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Abstract

The invention discloses a method for synergistically treating excess sludge with ore washing sludge. Mix the remaining sludge and rice straw according to the mass ratio of 1~5:10, put it into the reactor and raise the temperature to 60~700°C, and maintain the constant temperature for 2~12 hours, and finally dry it in an oven at 80~100°C , to produce residual sludge biochar. Add 1-100 g of the remaining sludge biochar to each liter of washing sludge, stir evenly, and then pump it into a filter press for dehydration through a sludge pump, and control the moisture content of the dewatered washing sludge to less than 60 %, to obtain dehydrated and washed sludge. Perform aerobic composting of the dehydrated ore washing sludge and the remaining sludge at a volume ratio of 0.05-1:1, and control the temperature of the compost at 20-70°C to obtain sludge compost. The obtained dewatered washing sludge is mixed with the obtained sludge compost at a volume ratio of 1 to 100:1, and finally used for backfilling the topsoil in the mining area, that is, the collaborative disposal of excess sludge by the washing sludge is realized. The implementation of the invention can achieve the purpose of treating waste with waste, and obtain good economic benefits.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, in particular to a method for co-processing excess sludge with ore washing mud. Background technique [0002] Washing sludge contains a lot of water and is difficult to dehydrate, so wet drainage is often used. Except for stacking and storing the washing sludge, there is currently no better treatment method for bauxite washing sludge at home and abroad. With the mining of ore deposits, the washing mud increases year by year, and the treatment and disposal of the washing mud is imminent. [0003] In addition, a large amount of sludge will be generated during the sewage treatment process of the sewage plant, and the effective treatment of the sludge has become an urgent problem to be solved. Composting is an important means of recycling sludge. The sludge mixed with green waste contains a large amount of organic matter and nutrients after composting, which can be used for the repair and improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/13C02F11/10C02F11/122C05G3/80C05F17/00C02F103/10
CPCC02F11/10C02F11/122C02F2103/10C05D9/00C05F17/00C02F11/13Y02W30/40
Inventor 张文杰孙晓杰蒋金平金樾
Owner GUILIN UNIVERSITY OF TECHNOLOGY