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A method for enhancing the stabilization process of heavy metals in anaerobic digested sludge

An anaerobic digestion and heavy metal technology, applied in biological sludge treatment, pyrolysis treatment sludge, by-product vaporization, etc., can solve the problems of weak acid impact resistance, weakened adsorption performance, poor stability, etc., and achieve uniform distribution, Reduce ecological risk and promote the effect of construction

Inactive Publication Date: 2017-08-25
TONGJI UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sludge anaerobic digestion system is complex, especially in the acid production stage, the pH of the reaction system is low, and the general biochar has weak acid resistance and poor stability, which easily weakens its adsorption performance

Method used

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  • A method for enhancing the stabilization process of heavy metals in anaerobic digested sludge
  • A method for enhancing the stabilization process of heavy metals in anaerobic digested sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The concrete steps of this embodiment are as follows:

[0027] Preparation of modified sludge biochar enhancer: The raw sludge used to make sludge biochar was taken from the dewatered sludge of a sewage treatment plant in Hefei (the organic matter content was 65.4%, and the main heavy metal content was lower than that of sludge for agricultural use. According to the standard (GB4284-1984), the sludge biochar preparation equipment is a special quartz vacuum tube furnace. After loading the raw sludge, it is first purged with 99.99% nitrogen for 30 minutes to empty the air, resulting in anoxic state, and the pyrolysis temperature The temperature is 650℃, and the duration is 4h. After cooling, it is ground, passed through a 100-mesh screen, and then modified by glass fiber infiltration, and finally prepared as a heavy metal stabilization enhancer in the process of sludge anaerobic digestion.

[0028]This implementation case adopts the medium temperature anaerobic digestion ...

Embodiment 2

[0031] In order to verify the effect of this method on the stabilization of heavy metals by anaerobic digestion of sludge with high heavy metal content, this implementation case is taken from the residual sewage of a sewage treatment plant that simultaneously undertakes domestic sewage from residents and wastewater from surrounding industrial parks (water volume ratio is 6:4). Mud (about 80% water content), its main mud index: pH 7.2, TS 8.7%, VS 3.2%, main heavy metal content (unit: mg / kg): As (11.76), Cd (1.28), Cr (1205.32 ), Cu (304.88), Ni (201.38), Pb (29.22), Zn (2864.21), the organic content of the sludge is lower than that of Example 1, but the main heavy metal content is obviously higher. The modified sludge biochar (MSBC) used, as well as the experimental equipment and experimental methods are the same as those in Example 1. Experimental results such as figure 2 shown. Depend on figure 2 (a) It can be clearly seen that even for sludge with a higher concentratio...

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Abstract

The invention relates to a method for enhancing heavy metal stabilization process in the urban sludge anaerobic digestion process. Municipal sludge serves as raw materials, a special vacuum reacting furnace is adopted, sludge biochar is prepared high-temperature pyrolysis under the anoxic condition, SBC is modified through glass fiber wetting, and finally the sludge biochar of a stable structure, with high voidage and resistant to acid and alkali impact is obtained; in the sludge anaerobic digestion acid production stage, the sludge is added to a reactor according to a proper proportion, free state heavy metal in the reactor can be absorbed and captured obviously, and finally the stabilizing process of the sludge heavy metal is accelerated and enhanced. The method basically cannot generate adverse influences on a sludge anaerobic digestion reaction system, the generated biogas residue is obviously lowered in the water content, and the dewaterability is obviously improved. The method can be used for remaining sludge anaerobic digestion engineering of sewage treatment plants in cities and towns, the heavy metal stabilization process in the anaerobic digestion process is effectively enhanced, the sludge stabilization process is accelerated, and the method has great significance for lowering the risk of heavy metal environmental pollution and improving the soil health quality in the utilization process of sludge lands generated after anaerobic digestion is conducted.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for using modified sludge biochar to strengthen the heavy metal stabilization process in the anaerobic digestion process of urban sludge. Background technique [0002] With the growth and development of population and urbanization, the number and scale of urban sewage plants continue to increase, and the output of residual sludge, a by-product of sewage treatment, is increasing. According to statistics, the output of residual sludge in Chinese cities reaches 2.2×10 7 t, and grow at a rate of about 10% per year. At present, about 80% of the sludge in my country has not been stabilized, which has led to the further spread of malodorous substances, pathogens, and persistent organic pollutants in the sludge, causing serious environmental pollution. At present, the main sludge stabilization treatment methods include aerobic composting, anaerobic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/10
CPCY02E50/30Y02W10/40
Inventor 杨长明荆亚超张敏
Owner TONGJI UNIV
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