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Stabilizing agent for heavy-metal polluted sediment treatment

A technology of polluted bottom sludge and stabilizer, which is applied in the direction of sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problems of ineffective treatment of pollution phenomena, impact on stability, poor buffer performance, etc. , to achieve the effects of easy promotion, reduced leaching, and low cost

Inactive Publication Date: 2012-10-03
ZHENGZHOU UNIV
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  • Abstract
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Problems solved by technology

[0005] However, traditional chemical remediation agents mainly use lime and biosolids as materials, and the cost is relatively high. During the remediation process, the remediation effect on single heavy metal contaminated soil is more significant, but the effect on the pollution associated with multiple elements is not outstanding.
Moreover, the traditional stabilizing agent has a single component, and its buffer performance in the sediment is poor, and the stability is affected when the sediment condition changes.

Method used

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  • Stabilizing agent for heavy-metal polluted sediment treatment

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Embodiment 1

[0014] The sediment of a tributary of the Mang River is seriously polluted by heavy metals, mainly containing lead, mercury, cadmium, chromium, nickel, copper, zinc, etc., and must be treated. The medicament prepared by the method of the invention is now used to stabilize the heavy metals in the river bottom mud.

[0015] Firstly, obtain the sediment samples polluted by heavy metals in the rehabilitated river section, pre-treat to remove stones, rhizomes, various new bodies and invasive bodies in the sediment samples, after natural air-drying, mix them evenly, and use the quartering method to take part of the sediment and grind them A 100-mesh sieve was used for digestion, and the content of heavy metals in the sample was determined by ICP-AES and atomic fluorescence spectrometer. The contents of various heavy metals are: lead 3780 mg / L, cadmium 142 mg / L, chromium 48.6 mg / L, mercury 5.11 mg / L, arsenic 260 mg / L, nickel 27.5 mg / L, copper 228 mg / L, And zinc 1140mg / L.

[0016] G...

Embodiment 2

[0022] Take the sediment samples polluted by heavy metals in the rehabilitated river section, pre-treat to remove stones, rhizomes, various new bodies and invasive bodies in the sediment samples, air-dry them naturally, mix them evenly, take part of the sediment by quartering method, grind them and pass through a 100-mesh sieve , after digestion, use ICP-AES and atomic fluorescence spectrometer to measure the content of heavy metals in the sediment, which are respectively: lead 3980mg / L, cadmium 132mg / L, chromium 37mg / L, mercury 6mg / L, arsenic 282mg / L, Nickel 29 mg / L, copper 247 mg / L, and zinc 1347 mg / L.

[0023] Combined with the dredging process of repairing the river channel, using the mixing action in the mud pump delivery process, according to the present invention and the ratio of 1:20 to the absolute dry solids weight ratio of the bottom mud, take 10 parts of calcium oxide and 8 parts of phosphoric acid respectively Calcium and 2 parts of sodium sulfide are uniformly mi...

Embodiment 3

[0028] A stabilizer for the treatment of heavy metal-contaminated sediments, which is made of the following raw materials: 10 kg of calcium oxide, 8 kg of calcium phosphate, and 5 kg of sodium sulfide.

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Abstract

The invention discloses a stabilizing agent for heavy-metal polluted sediment treatment. The stabilizing agent is prepared from the follow raw materials by weight portion: 4-10 portions of calcium oxide, 2-8 portions of calcium phosphate and 0.1-5 portions of sodium sulphide. The leaching concentration of heavy metal in sediments can be effectively reduced through the stabilizing agent, and the stabilizing agent can react with the heavy metal easy to be dissolved out in the sediments to generate stable mineral compositions. The used drugs are cheap and are easily obtained, the cost is lower, no secondary pollution exists, and the stabilizing agent is easy to popularize.

Description

technical field [0001] The invention belongs to the field of sediment pollution restoration in environment and water conservancy projects, and in particular relates to a preparation method of a medicament suitable for treating heavy metal pollution in sediment of surface water bodies. Background technique [0002] Heavy metal pollution generally refers to specific gravity greater than 5.0g / cm 3 Metals (mainly including mercury (Hg), lead (Pb), chromium (Cr), zinc (Zn), copper (Cu), cadmium (Cd), nickel (Ni), barium (Ba), cobalt (Co), tin (Se) and metalloid arsenic (As), etc.) or its compounds in the environment. Heavy metal pollution has the characteristics of long-term, cumulative, hidden, latent and irreversible. Heavy metal contaminated sediment mainly refers to the sediment polluted by heavy metals such as lead, mercury, cadmium, arsenic, hexavalent chromium, total chromium, nickel, copper and zinc. [0003] Heavy metals in water body sediment can come from atmospheri...

Claims

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Application Information

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IPC IPC(8): C02F11/00
Inventor 高健磊吴建平闫怡新刘玥卢一富付燕丽邱坤艳汤争争赵小学卫海林
Owner ZHENGZHOU UNIV
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