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Method for reducing content of heavy metals in sludge source

A heavy metal and sludge technology, applied in sludge treatment, chemical instruments and methods, restoration of contaminated soil, etc., can solve the problems of rare anaerobic digested sludge and its comparative evaluation report with activated sludge, and achieve Good economic benefits, long duration, and the effect of inhibiting absorption

Inactive Publication Date: 2017-02-22
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Most of the evaluation objects are aimed at the activated biological sludge produced by urban sewage treatment plants, and there are few reports on the comparison and evaluation of anaerobic digested sludge and activated sludge

Method used

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  • Method for reducing content of heavy metals in sludge source
  • Method for reducing content of heavy metals in sludge source
  • Method for reducing content of heavy metals in sludge source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Firstly, through the indoor cultivation test, the passivation time and the optimal addition amount of the passivator were compared and analyzed, and then the passivation effect was verified through the pot test. The main results are as follows:

[0069] 1. Comparative analysis of passivation time of different types of heavy metal passivators

[0070] The test sludge was collected from the fermented and decomposed domestic sludge of Beijing Daxing Panggezhuang Sludge Treatment Plant. The test passivators were peat, fly ash, zeolite powder, steel slag powder, lime powder and biochar etc. 6 types. The passivator and sludge are air-dried and finely ground respectively, and passed through a 2mm sieve for later use. The addition amount of the six passivating agents is 5% of the air-dried weight of the tested sludge. The passivating agent and the sludge are fully mixed, moistened with distilled water, and the cultivation test is carried out at room temperature. The cultivatio...

Embodiment 2

[0078] Embodiment 2, comparative analysis of the passivation effect of different passivating agent types and different addition amounts

[0079] On the basis of the preliminary test, further adjustment tests are made on the passivation parameters of the passivator. A total of 2 kinds of passivators were selected: fly ash (FMH), the pH is slightly alkaline, and the economic benefit is higher than that of lime powder, which is the recycling of waste; peat (CT), the pH value is weakly acidic, and the passivation principle is different Compared with fly ash, it is cheap and easy to obtain.

[0080] The tested sludge was collected from Panggezhuang Sludge Treatment Plant. The culture experiment aimed to investigate the effective state control effect of heavy metals Cd and Hg in the sludge under the condition of different additions of passivating agent. The addition amount of each passivator is divided into 9 gradients (calculated by air-dried sludge weight) such as CK, 1%, 3%, 5%,...

Embodiment 3

[0085] Embodiment 3, different sludge additions and the passivation effect pot test analysis of different passivators

[0086] The pot experiment was carried out in the greenhouse of the Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences. The test sludge fertilizer was collected from Beijing Daxing Panggezhuang Sludge Treatment Plant, and the test crop was rapeseed (Lvguan F1). Two passivating agents were used: fly ash (FMH) and peat (CT). The amount of sludge fertilizer application is set to 4 levels, namely 0g / kg, 5g / kg, 20g / kg and 40g / kg. The amount of passivator added was 40% of the air-dry weight of the sludge fertilizer application amount; the experiment was repeated 3 times. After 45 days of sowing, harvest, sample, and analyze, the obtained results are as follows: Figure 5 to Figure 8 shown.

[0087] Figure 5 It is the analysis of the content of available Cd in the soil under different treatments. It can be seen that ...

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Abstract

The invention discloses a method for reducing the content of heavy metals in a sludge source. The method for reducing the content of the heavy metals in the sludge source comprises a method for reducing the content of the heavy metals in the sludge source and a method for reducing the content of heavy metals in a plant. The method for reducing the content of the heavy metals in the sludge source comprises the step of adding a passivating agent into the sludge source, wherein the passivating agent is grass carbon, fly ash, zeolite powder, lime powder, steel slag powder, lime powder or biomass charcoal. The method disclosed by the invention has the benefits that by taking the features of the sludge source as a basis, the passivation effect of a conventional passivating agent is subjected to test and contrastive analysis to determine an optimal passivating method; not only can the effective state content of the heavy metals Cd and Hg in the sludge be effectively reduced, but also the absorption and the enrichment of the heavy metals Cd and Hg in soil can be inhibited. Meanwhile, the economic benefits are good, and the fly ash and other wastes are subjected to resource utilization.

Description

technical field [0001] The invention relates to a method for reducing heavy metal content in sludge sources. Background technique [0002] Sludge is an inevitable product of sewage treatment plants and sewage treatment. After entering the environment without proper treatment, sludge will directly cause secondary pollution to water, soil, and air, which not only reduces the effective treatment capacity of the sewage treatment system, but also affects the environment. pose a serious threat to human activities. Statistics show that as of the end of March 2011, cities and counties across the country have accumulatively built 2,996 urban sewage treatment plants, with a treatment capacity of 1.33×108m 3 / d, resulting in a huge amount of sludge, which will lead to serious environmental pollution if it is not properly disposed of. If it can be properly disposed of and used, it can turn harm into profit and generate abundant resources. [0003] The main factors affecting the land u...

Claims

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Application Information

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IPC IPC(8): C02F11/00B09C1/10
CPCC02F11/00B09C1/105
Inventor 李顺江李鹏赵同科杜连凤毕晓庆李新荣
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES