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Method of treating waste water containing heavy metal with waste sludge as carrier

A waste sludge and heavy metal technology, applied in water/sludge/sewage treatment, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve problems such as long operation period, harsh operating conditions, and unstable process, and achieve The effect of short operation period, low cost and wide application range

Inactive Publication Date: 2004-11-24
CENT SOUTH UNIV
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Problems solved by technology

[0008] Metabolites from sulfate-reducing bacteria (SRB) (H 2 S) Make heavy metal ions in water form metal sulfide precipit

Method used

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  • Method of treating waste water containing heavy metal with waste sludge as carrier

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Embodiment

[0027] Firstly, the activated sludge from the domestic sewage plant and a very small amount of culture solution containing inducing factors are added to the anaerobic bioreactor, and the directional activation culture of the activated sludge is carried out at 28-35°C. After the activity of the sludge is activated, the bacterial flora After growth and reproduction, heavy metal wastewater with a pH value of 3 and a concentration of 435.95 mg / L from a smelting enterprise is discharged into the reactor and fully mixed with the activated sludge. After 1 to 2 hours of treatment, the main Heavy metal ions Zn 2+ From the initial 413.36mg / L to 4.1mg / L, other heavy metal ions cannot be detected, and the physical and chemical indicators of the wastewater after treatment meet the national discharge standards. The treatment effect of heavy metal wastewater is shown in Table 1.

[0028] Physical and chemical indicators of wastewater

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Abstract

The present invention relates to biological method of processing waste water containing heavy metal, and is especially biological method of processing waste water containing heavy metal with residual active sludge from city domestic sewage processing yard or waste industrial sludge as carrier. The biological method features that the sludge is mixed with nutritive N and P containing matter essential for microbes to grow to form efficient micro ecological system after directional activating culture inside reactor; waste water containing heavy metal is then introduced into the reactor for anaerobic treatment; and the upper layer sludge with rich heavy metal then flows into precipitator for partial reflux, enriching and biological or chemical recovery of heavy metal while draining the supernatant. The method has wide applicable range, high purifying efficiency, short period, low cost and simple technological process.

Description

Technical field: [0001] The invention relates to a biological method for treating heavy metal wastewater, in particular to a method for biologically treating heavy metal wastewater using residual activated sludge or industrial waste sludge from urban domestic sewage plants as a carrier. Background technique: [0002] There are many physical and chemical methods for treating heavy metal wastewater, each of which has its advantages and disadvantages. [0003] The chemical precipitation method is easy to quickly remove a large amount of metal ions, but often cannot achieve the standard, and the excess precipitant itself added in the precipitation process is often toxic or harmful, causing secondary pollution to the environment. [0004] The ion exchange method has mature technology, simple operation, and good treatment effect under certain conditions, but the price of ion exchange resin is high, and the selective exchange performance is not good. When treating heavy metal waste...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/52C02F1/62C02F3/28
Inventor 柴立元闵小波于霞彭兵王云燕何德文刘恢
Owner CENT SOUTH UNIV
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