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Method for removing heavy metals in organic sludge by slurrying

An organic sludge and heavy metal technology, applied in chemical instruments and methods, dehydration/drying/concentrated sludge treatment, organic fertilizers, etc., can solve problems such as unfavorable plant growth and development, danger, and inability to solve heavy metal pollution in sludge, and achieve Realize the effect of mass production and treatment, easy operation and comprehensive utilization of waste

Pending Publication Date: 2020-08-18
泉州市洋屿土壤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the concentration of chloride ions in salt mud is very high, which is not conducive to the growth and development of plants, and cannot solve the problem of heavy metal pollution in sludge
[0008] Although the current organic sludge stabilization treatment technology is quite mature, the heavy metals in it have not been removed from the sludge, which is a potential danger

Method used

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  • Method for removing heavy metals in organic sludge by slurrying
  • Method for removing heavy metals in organic sludge by slurrying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 10 tons of organic sludge with a moisture content of 80% into the reactor and 10m 3 The circulating liquid is fully stirred and mixed to form a suspension, and then 85L of iron-containing waste liquid (density 1.18g / ml) with a concentration of 20% is added, and fully stirred to completely and evenly mix with the organic sludge until it is completely slurried to form a slurry; Send the slurry to the X20 reinforced polypropylene filter press for pressure filtration, and the filter cake is the product - de-heavy sludge, with a moisture content of 80%, a pH value of 6.8, and the test results of five kinds of strictly controlled heavy metal contents are shown in Table 2, completely Reach the I-level standard of the control index. Add 8.8L concentration of 20% sulfur-containing waste liquid (density 1.14g / ml) after the obtained filtrate is pumped to the settling tank as a precipitating agent, stir at high speed to fully react the precipitating agent and the filtrate; let ...

Embodiment 2

[0044] Add 10 tons of organic sludge with a moisture content of 80% into the reactor and 10m 3 The circulating liquid is fully stirred and mixed to form a suspension, and then 85L of iron-containing waste liquid (density 1.18g / ml) with a concentration of 20% is added, and fully stirred to completely and evenly mix with the organic sludge until it is completely slurried to form a slurry; Send the slurry to the X20 type polypropylene filter press for pressure filtration, and the filter cake is the product - de-heavy sludge, with a moisture content of 80%, a pH value of 6.8, and the test results of five kinds of strictly controlled heavy metal contents are shown in Table 3, completely Reach the I-level standard of the control index. After the obtained filtrate is pumped to the settling tank, add 11.9L of 15% sulfur-containing waste liquid (density 1.12g / ml) as a precipitant, stir at a high speed to fully react the precipitant and the filtrate; let it settle for 24 hours, and pump...

Embodiment 3

[0048] Add 10 tons of organic sludge with a water content of 80% (the Cd content in this batch of raw materials is relatively high) into the reactor and 10m 3 The circulating liquid is fully stirred and mixed to form a suspension, and then 116L of iron-containing waste liquid with a concentration of 20% (density 1.14g / ml) is added, and fully stirred to completely and evenly mix with the organic sludge until it is completely slurried to form a slurry; The slurry is sent to the X20 type polypropylene filter press for pressure filtration, and the obtained filter cake is returned to the reactor, and the second heavy metal removal treatment is also carried out, and the filter cake of the second pressure filtration is used as the product - heavy sludge removal , moisture content 80%, pH value 6.8, measured 5 kinds of strictly controlled heavy metals twice and removed heavy metal content respectively as shown in Table 4, and finally completely reached the I level standard of the contr...

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Abstract

The invention discloses a method for removing heavy metals in organic sludge by slurrying. The method specifically comprises the following steps: adding the organic sludge into a reaction kettle, andfully stirring and mixing with circulating liquid; adding a sludge depolymerizing agent, and stirring the mixture at a high speed to completely pulpify the organic sludge to form slurry; sending the slurry to a plate-and-frame filter press for filter pressing, wherein a filter cake is the product de-heavy sludge; pumping the filtrate into a sedimentation tank, adding a precipitant, stirring the mixture at a high speed for full reaction, carrying out standing sedimentation, and pumping supernatant back to the reaction kettle to be repeatedly used as circulating liquid. By means of the method, the removal rate of Cd, Cr, Pb and Hg can reach 5-50%, wherein the content indexes of the five heavy metals in the product heavy metal removal sludge completely meet the highest standard of serving asa soil conditioner and argillaceous for landscaping. The technological process is simple and convenient to operate, instruments and equipment are universal and easy to obtain, raw materials are turnedinto wealth, and bulk treatment of organic sludge heavy metal removal can be achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for removing heavy metals in organic sludge by adopting a pulping method. Background technique [0002] Organic sludge refers to sludge with organic matter as the main component, usually referred to as sludge, the main characteristics are high content of organic matter, perishable and smelly, fine particles, small specific gravity, high moisture content and not easy to dehydrate, and it is colloidal Structure of hydrophilic substances, easy to use pipelines; and sludge often contains a lot of plant nutrients, parasite eggs, pathogenic microorganisms and heavy metal ions. [0003] At present, the main methods of sludge disposal in countries around the world are landfill, incineration, throwing into the sea and agricultural use. Because landfill needs to occupy a large amount of land, it is easy to cause secondary pollution, and the transportation and sit...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/122C02F11/14C02F1/52C05F7/00C09K17/40C09K17/08
CPCC02F11/00C02F11/122C02F11/14C02F1/5236C05F7/00C09K17/40C09K17/08C02F2101/20C02F2101/22Y02A40/20
Inventor 钟云峰黄紫洋肖自军
Owner 泉州市洋屿土壤科技有限公司
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