Method for passivating available copper and nickel in municipal sludge by white-rot fungi and compost

A technology of white rot fungus and urban sludge, applied in the environmental field, can solve the problems of low passivation efficiency of heavy metals, low microbial reproduction ability, strong microbial toxicity, etc., and achieve high utilization value, high practical application value, and low cost Effect

Inactive Publication Date: 2017-08-11
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the passivation efficiency of composting for heavy metals is low, which limits its use in municipal sludge treatment.
[0005] At present, many scholars at home and abroad treat copper and nickel in municipal sludge by adjusting composting conditions individually or by microorganisms. In the process of adjusting composting conditions, there are many influencing factors and strong randomness, the adjustment process is complicated, and the reliability is low. , and in microbial treatment of heavy metals in sludge, heavy metals are highly toxic to microorganisms, low in microbial reproduction ability, and low in passivation efficiency of heavy metals.

Method used

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  • Method for passivating available copper and nickel in municipal sludge by white-rot fungi and compost

Examples

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Effect test

Embodiment 1

[0034] A kind of method utilizing white rot fungus synergistic composting passivation available state copper and nickel in urban sludge, comprises the following steps:

[0035] Wash the rice straw with deionized water for 5 times, dry it at 60°C, and cut it into 2cm long pieces; city sludge, rice straw, and bran are used as raw materials, and mixed according to the ratio of 30:9:5 (wet weight ratio) Stir, inoculate the Phanerochaete chrysosporium spore suspension of 6% (mass ratio), fully stir, adjust the moisture content to 66%, stack into cones, build a total mass of 5kg compost system, and compost continuously for 60 days.

[0036] Dry the sample at 105°C for 6 hours, pass through a 100-mesh sieve after grinding, extract copper and nickel step by step and form by BCR extraction method, filter with a 0.45 micron membrane, measure and calculate the effective state in municipal sludge by ICP-OES The passivation rate of copper and nickel, the measurement results are shown in Ta...

Embodiment 2

[0041] A kind of method utilizing white rot fungus synergistic composting passivation available state copper and nickel in urban sludge, comprises the following steps:

[0042] Wash the rice straw with deionized water for 5 times, dry it at 60°C, and cut it into 2cm long pieces; city sludge, rice straw, and bran are used as raw materials, and mixed according to the ratio of 30:9:5 (wet weight ratio) Stir, inoculate the Phanerochaete chrysosporium spore suspension of 6% (mass ratio), fully stir, adjust the moisture content to 60-70%, stack into cones, build a total mass of 5kg compost system, and compost continuously for 40 days.

[0043]Dry the sample at 105°C for 6 hours, pass through a 100-mesh sieve after grinding, extract copper and nickel step by step and form by BCR extraction method, filter with a 0.45 micron membrane, measure and calculate the effective state in municipal sludge by ICP-OES The passivation rate of copper and nickel, the measurement results are shown in ...

Embodiment 3

[0048] A kind of method utilizing white rot fungus synergistic composting passivation available state copper and nickel in urban sludge, comprises the following steps:

[0049] Wash the rice straw with deionized water for 5 times, dry it at 60°C, and cut it into 2cm long pieces; city sludge, rice straw, and bran are used as raw materials, and mixed according to the ratio of 30:9:5 (wet weight ratio) Stir, inoculate the Phanerochaete chrysosporium spore suspension of 6% (mass ratio), fully stir, adjust the moisture content 66%, stack into a cone, build a total mass of 5kg compost system, and compost continuously for 40 days; The composting frequency is set to two types: one is to turn the compost once a week; the other is to turn the compost once after 25 days, and then turn it once a week.

[0050] Dry the sample at 105°C for 6 hours, pass through a 100-mesh sieve after grinding, extract copper and nickel step by step and form by BCR extraction method, filter with a 0.45 micro...

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Abstract

The invention discloses a method for passivating available copper and nickel in municipal sludge by white-rot fungi and compost, and belongs to the field of the environment. The white-rot fungi and compost treatment method synergistically acts on passivation treatment of the available copper and nickel in the municipal sludge, the available copper and nickel are fixed and chelated by a rice straw and bran compost fermented product, and meanwhile, growth nutritional substances are provided for the white-rot fungi; and the white-rot fungi promotes decomposition of substances which are difficult to decompose in a compost system, the sludge is promoted to become thoroughly decomposed, the chelating and passivating effect of a decomposed product to copper and nickel is promoted, meanwhile, by the adsorption and chelating effect of the white-rot fungi to the copper and nickel, the passivation rate of the available copper and nickel in the municipal sludge is further increased effectively, resource utilization of wastes of crops is realized, agricultural risks of the municipal sludge are reduced, and the resource utilization value of the municipal sludge is increased. The method has the advantages of zero secondary pollution, simple treatment process, simplicity and convenience in operation, low investment and running costs and the like. The practical application value is quite high.

Description

technical field [0001] The invention belongs to the field of environment, and in particular relates to a method for passivating effective copper and nickel in urban sludge by using white-rot fungus cooperative composting. Background technique [0002] After municipal sludge is dehydrated in sewage treatment plants, it is often used in agriculture or forestry due to its rich nitrogen and phosphorus nutrients. However, due to economic development, the concentration of heavy metals in urban sewage is increasing, which in turn leads to a substantial increase in the content of heavy metals in urban sludge. Because heavy metals cannot be metabolized by organisms, they will accumulate in organisms through the food chain, and when the concentration exceeds the amount required by organisms, they will have a toxic effect on organisms. Among them, excessive copper and nickel will accumulate in the human body and cause cancer. Therefore, excessive heavy metals limit the agricultural u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/16C05F7/00C02F101/20
CPCC02F11/02C02F11/16C02F2101/20C05F7/00Y02A40/20
Inventor 张朝升许莹赵美花荣宏伟
Owner GUANGZHOU UNIVERSITY
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