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Accelerant for accelerating anaerobic digestion of excess sludge as well as preparation method and application thereof

A technology of excess sludge and anaerobic digestion, which is applied in the field of resource utilization of solid waste, can solve the problems of low sludge reduction and resource utilization, iron cannot be reused, and iron dissolution rate is slow, so as to broaden the pH range, accelerated dissolution, and enhanced hydrolysis effects

Active Publication Date: 2018-12-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the existing iron treatment process of excess sludge, the dissolution rate of iron is slow and the efficiency is low. At the same time, it needs to be combined with enhanced pretreatment to achieve better digestion effect. Iron cannot be reused, the amount of methane produced is small, and sludge reduction and Due to the low degree of resource utilization and narrow application range, the present invention provides an accelerator for accelerating the anaerobic digestion of excess sludge and its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of Accelerator for Accelerating Anaerobic Digestion of Surplus Sludge

[0040] Get remaining sludge 20L in the secondary settling tank, weigh, and weight is 20kg, add the polyaluminium chloride aqueous solution of the 20% mass concentration of 100ml in 20L excess sludge, then add 200g sodium edetate again, stir, Stirring time is 1 hour, stirring speed is 200r / min, dehydration until water content is 75%, adding sodium hydroxide solution to adjust pH to 10-11, and then adjusting pH to 7-8 with dilute hydrochloric acid to obtain neutral sludge, Divide the obtained neutral sludge into two parts, and dry one part of the neutral sludge at a drying temperature of 80°C for 20 hours, pulverize it, and vacuum pyrolyze it at a temperature of 400°C , the pyrolysis time is 1 hour, and the sludge activated carbon matrix raw material is obtained, and another part of neutral sludge is kept for later use, and the obtained activated carbon matrix raw material is soaked in an ...

Embodiment 2

[0042] Preparation of Accelerator for Accelerating Anaerobic Digestion of Surplus Sludge

[0043] Get remaining sludge 20L in the secondary settling tank, weigh, and weight is 20kg, add the polyaluminum chloride aqueous solution of the 20% mass concentration of 140ml in 20L surplus sludge, then add 400g sodium edetate again, stir, The stirring time is 1.5 hours, the stirring speed is 250r / min, dehydration until the water content is 80%, adding sodium hydroxide solution to adjust the pH to 10-11, and then adjusting the pH to 7-8 with dilute hydrochloric acid to obtain neutral sludge. Divide the obtained neutral sludge into two parts, and dry one part of the neutral sludge at a drying temperature of 100°C for 22 hours, pulverize it, and vacuum pyrolyze it at a temperature of 450°C , the pyrolysis time is 1.5 hours, and the sludge activated carbon matrix raw material is obtained. Another part of neutral sludge is kept for later use. The activated carbon matrix raw material obtain...

Embodiment 3

[0045] Preparation of Accelerator for Accelerating Anaerobic Digestion of Surplus Sludge

[0046]Get remaining sludge 20L in the secondary settling tank, weigh, and weight is 20kg, add the polyaluminum chloride aqueous solution of the 20% mass concentration of 200ml in 20L surplus sludge, then add 800g sodium edetate again, stir, Stirring time is 2 hours, stirring speed is 300r / min, dehydration until water content is 85%, adding sodium hydroxide solution to adjust pH to 10-11, and then adjusting pH to 7-8 with dilute hydrochloric acid to obtain neutral sludge, Divide the obtained neutral sludge into two parts, and dry one part of the neutral sludge at a drying temperature of 120°C for 24 hours, pulverize it, and vacuum pyrolyze it at a temperature of 500°C , the pyrolysis time is 2 hours, and the sludge activated carbon matrix raw material is obtained, and another part of neutral sludge is kept for later use, and the obtained activated carbon matrix raw material is soaked in t...

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Abstract

The invention discloses an accelerant for accelerating anaerobic digestion of excess sludge as well as a preparation method and application thereof, and belongs to the field of solid waste reclamation. According to the accelerant as well as a preparation method and application thereof, the problems that in existing iron treatment excess sludge, pretreatment needs to be enhanced, the iron dissolution rate is low, the efficiency is low, and the sludge reduction and reclamation degree is low can be solved, the excess sludge is used as a raw material, a series of steps are carried out so as to obtain sludge activated carbon which is highly activated, then the sludge activated carbon, iron powder, common activated carbon and a binder are mixed according to a specific ratio and are pressed intoballs, sintering is carried out, then sodium ethylene diamine tetracetate is added, pressing forming is carried out, and drying is carried out so as to obtain the accelerant for accelerating anaerobicdigestion of the excess sludge; and an iron-carbon micro-electrolysis principle is utilized, the dissolution of iron is accelerated, due to the existence of ethylene diamine tetraacetic acid and Mn,the pH range of the accelerant in the sludge treatment is widened, the pH of the sludge does not need to be adjusted, the sludge can be treated by directly using the accelerant obtained through the method, and the cost is lowered.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, and in particular relates to an accelerator for accelerating anaerobic digestion of excess sludge, a preparation method and application thereof. Background technique [0002] With the continuous improvement of my country's urbanization level, sewage treatment technology has been developed rapidly. According to statistics, 3,501 urban sewage treatment plants have been built nationwide, with a sewage treatment capacity of 147 million m3 / day (a method to improve the exhaustion of residual activated sludge Oxygen supplementation). With the continuous improvement of processing capacity and processing capacity, the accompanying problem is a substantial increase in the amount of residual sludge. According to statistics, my country produces more than 30 million tons of sludge every year (based on a water content of 80%). Sludge contains a large amount of pollutants such as organic matt...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCC02F11/04Y02E50/30
Inventor 刘波杜凌峰程绍举侯玉倩盛世雄周德超葛志斌
Owner NANJING UNIV
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