Method for preparing heavy metal adsorbent by sludge bioleaching-pyrolysis combined treatment

A technology of sludge and biochar, which is applied in the field of resource utilization of solid waste, can solve problems such as biochar, achieve high adsorption capacity, and improve adsorption performance

Inactive Publication Date: 2018-11-30
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At present, there is no patent report on the preparation of biochar by bioleaching-pyrolysis

Method used

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  • Method for preparing heavy metal adsorbent by sludge bioleaching-pyrolysis combined treatment
  • Method for preparing heavy metal adsorbent by sludge bioleaching-pyrolysis combined treatment
  • Method for preparing heavy metal adsorbent by sludge bioleaching-pyrolysis combined treatment

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Embodiment

[0028] (1) Take fresh sludge from the sludge concentration tank of a sewage treatment plant in Guangxi, add 500mL of fresh sludge to a 1000mL serum bottle, and add 5g of FeSO 4 ·7H 2 O is the substrate, and the culture is shaken at 25°C and 180 r / min until the pH value of the sludge drops and stabilizes to 2.0 to obtain the sludge bacterial solution.

[0029] (2) Take 50mL of the sludge bacterial solution obtained in step (1) and add it to 500mL of fresh sludge, add 5g of FeSO 4 ·7H 2 O, at 25°C, 180r / min shaking culture, until the pH value is stable to 2.0, repeat the above steps 5 times, to inoculate the sludge bacterial liquid; with the increase of the number of inoculations, each time the bacterial liquid is cultivated until the stable growth period Time gradually shortened to 5 days.

[0030] (3) Take the fresh sludge from the sludge thickening tank of a certain sewage treatment plant in Guangxi, adjust the sludge solid content to 2.2%; put 300mL of the above fresh slu...

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Abstract

The invention discloses a method for preparing a heavy metal adsorbent by sludge bioleaching-pyrolysis combined treatment. The method comprises the following steps: (1) taking concentrated sludge as abacterial source, adding FeSO4.7H2O as an energy substrate, culturing until the pH value is 2.0-3.0, taking a bacterial solution as inoculum, and adding the inoculum to the concentrated sludge to culture for 3-5 times as bioleaching inoculation fluid; (2) regulating the solid content of the concentrated sludge to 2%-6%, adding the inoculum, adding FeSO4.7H2O to treat for 3-7 days, performing solid-liquid separation and drying until moisture content is 10% or lower, thereby obtaining leached dried sludge; and (3) crushing the obtained sludge to be 0.3 mm, adding crushed organic waste, heatingto 300-700 DEG C, and performing constant-temperature pyrolysis for 0.5-3 hours. The method is low in cost, and is wide in material source; and the obtained composite sludge-based biochar is low in heavy metal residue, is high in iodine adsorption value and is high in heavy metal ion adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a preparation method of a heavy metal adsorbent obtained by using urban sludge as a main raw material and utilizing a bioleaching-pyrolysis combined treatment technology. Background technique [0002] With the rapid development of my country's social economy, the amount of excess sludge produced in the process of urban sewage treatment has increased dramatically year by year. According to the National Bureau of Statistics, by the end of 2016, more than 3,500 sewage treatment plants had been built in cities and counties across the country, with a daily sewage treatment capacity of 150 million cubic meters. According to the estimation of 5 tons of dewatered sludge (water content 80%) for every 10,000 tons of sewage treated, about 30 million tons of sludge will be generated in 2016. According to the requirements of the national "Water Ten Measures", the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F11/12C02F1/28C02F101/20
CPCB01J20/20C02F1/28C02F11/12C02F2101/20
Inventor 张军姚全威王晟亦王敦球
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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