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Bioleaching reinforcing agent, and method used for removing sludge heavy metal

A biological leaching, heavy metal technology, applied in biological sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of shortening the sludge treatment period, increasing the sludge treatment cost, and the cost of bacterial culture. It can achieve the effect of promoting the dissolution of heavy metals, killing pathogenic bacteria in sludge, and improving the dissolution efficiency.

Active Publication Date: 2017-11-17
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 1375553A introduces a Thiobacillus ferrooxidans and its method for removing heavy metals from sludge. This method needs to inoculate pure strains, but the cost of strain cultivation is high, the operation is more complicated, and the treatment cycle is longer
In order to further improve the dissolution efficiency of heavy metals in sludge, patent CN 101891358 A discloses a bioleaching-Fenton-like oxidation coupling method for removing heavy metals in excess sludge. This method shortens the sludge treatment cycle, but the H in the Fenton reaction 2 o 2 The concentration is high, which significantly increases the treatment cost of sludge

Method used

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  • Bioleaching reinforcing agent, and method used for removing sludge heavy metal

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Effect test

Embodiment 1

[0040] A method for utilizing free nitrous acid to strengthen biological leaching to remove heavy metals in sludge, comprising the steps of:

[0041] (1) Sludge bioleaching: Add 270mL of test sludge 1 with a solid content of 20g / L in a 500mL conical flask, inoculate 30mL of domesticated bioleaching culture 1, and then add 1g of elemental sulfur, Shaking culture at room temperature 200r / min for 2 days, the pH value of the sludge dropped to 2.53;

[0042] (2) Free nitrous acid reaction: add 63.80mgNaNO to the sludge treated by bioleaching 2 (equivalent to 20mgFNA-N / L), 30°C, 200r / min shaking culture for 8h; the dissolution rates of heavy metals Cu, Zn, Pb, Cd, Mn and Co in the sludge were 55.48%, 93.69%, 5.26%, 64.38% respectively %, 50.69%, 47.96%;

[0043] (3) Sludge dehydration: the treated sludge is dehydrated by centrifugal dehydration; the moisture content of the treated sludge is 74.8%;

[0044] (4) Removal of heavy metals in the filtrate: add an appropriate amount of ...

Embodiment 2

[0046] A method for utilizing free nitrous acid to strengthen biological leaching to remove heavy metals in sludge, comprising the steps of:

[0047] (1) Sludge bioleaching: Add 270mL of test sludge 1 with a solid content of 20g / L in a 500mL conical flask, inoculate 30mL of domesticated bioleaching culture 1, and then add 1g of elemental sulfur, Shaking culture at room temperature 200r / min for 2 days, the pH value of the sludge dropped to 2.53;

[0048] (2) Free nitrous acid reaction: add 127.60mgNaNO to the sludge treated by bioleaching 2 (equivalent to 40mgFNA-N / L), 30°C, 200r / min shaking culture for 8h; the dissolution rates of heavy metals Cu, Zn, Pb, Cd, Mn and Co in the sludge were 56.13%, 94.28%, 6.31%, 65.89% respectively %, 54.37%, 49.45%;

[0049] (3) Sludge dehydration: the treated sludge is dehydrated by centrifugal dehydration; the moisture content of the treated sludge is 73.5%;

[0050] (4) Removal of heavy metals in the filtrate: add an appropriate amount of...

Embodiment 3

[0052] A method for utilizing free nitrous acid to strengthen biological leaching to remove heavy metals in sludge, comprising the steps of:

[0053] (1) Sludge bioleaching: Add 255mL of test sludge 1 with a solid content of 20g / L in a 500mL Erlenmeyer flask, inoculate 45mL of domesticated bioleaching culture 1, and then add 1.5g of elemental sulfur , 150r / min shaking culture at room temperature for 3 days, the pH value of the sludge dropped to 2.08;

[0054] (2) Free nitrous acid reaction: add 60.78mgNaNO to the sludge treated by bioleaching 2 (equivalent to 20mgFNA-N / L), 30°C, 150r / min shaking culture for 6h; the dissolution rates of heavy metals Cu, Zn, Pb, Cd, Mn and Co in the sludge were 58.36%, 95.52%, 5.98%, 67.79% respectively %, 52.49%, 50.32%;

[0055] (3) Sludge dehydration: the treated sludge is dehydrated by centrifugal dehydration, and the moisture content of the treated sludge is 72.3%;

[0056] (4) Removal of heavy metals in the filtrate: add an appropriate ...

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Abstract

The invention discloses a bioleaching reinforcing agent, and a method used for removing sludge heavy metal. According to the method, a nitrite is added on the base of bioleaching, so that free nitrous acid is obtained, dissolution efficiency of heavy metal, especially organic combined heavy metal, in sludge is increased obviously, and problems of conventional bioleaching that treatment period is long (usually 10 to 15d) and treatment efficiency is low are solved. According to the method, a bioleaching culture substance is obtained via culture and domesticate of original sludge, adding of purebred sulphur bacteria or complex original sulphur bacteria screening and pure culture are not needed, treatment cost is reduced greatly, and operation difficulty is reduced. In sludge treatment process, sludge setting performance and killing effect on sludge pathogens are improved, favorable conditions are provided for sludge subsequent treatment and utilization. The nitrite in the bioleaching reinforcing agent is cheap, and can be obtained easily. The application prospect is promising.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution control, and more specifically relates to a biological leaching enhancer and a method for removing heavy metals from sludge. Background technique [0002] As of September 2016, 3,976 sewage treatment plants have been built nationwide, with a treatment capacity of 170 million m 3 / d, most of its treatment processes are based on activated sludge method, and municipal sludge is an inevitable product of sewage treatment plants. Municipal sludge contains a large amount of organic matter and rich N, P, K and other nutrient elements, which can be used as fertilizer or soil additive, but the sludge enriches 50-80% of heavy metals in the sewage treatment process, which seriously restricts the sludge resource utilization. [0003] Heavy metals in municipal sludge mainly exist in the solid phase of sludge in the form of insoluble sulfides and organic compounds. At present, the common removal methods o...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/20
CPCC02F11/02C02F2101/20C02F2303/04
Inventor 余震周普雄汤佳刘晓明王跃强
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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