Process of eliminating heavy metals from city sewage and sludge

A technology for urban sewage and heavy metals, which is applied in the direction of water pollutants, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as the decline of soil quality, the reduction of total heavy metals, and the reduction of crop production, so as to achieve stable and reliable operation and reduce The effect of the number of equipment and small footprint

Inactive Publication Date: 2007-11-07
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

At present, to solve this problem, the main method is to add passivators and alkaline materials to the sludge to stabilize the heavy metals in it. Since the total amount of heavy metals in the sludge after treatment has not been reduced, the subsequent resource utilization In the process, it is easy to cause a series of negative effects such as the decline of soil quality, crop yield reduction or heavy metal enrichment.
In response to this problem, some experts in my country have proposed to use bioleaching to remove or reduce high-concentration heavy metal elements in sludge. Among them, the two patents of Nanjing Agricultural University on this

Method used

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  • Process of eliminating heavy metals from city sewage and sludge

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Embodiment

[0022] The residual sludge in the secondary sedimentation tank of an urban sewage purification plant in Guilin City, Guangxi was used. The basic characteristics of the sludge are shown in Table 1.

[0023]

project

pH

organic

Quality (%)

N

(g / kg)

P

(g / kg)

K

(g / kg)

Cu

Zn

Ni

Cd

Cr

Pb

mg / kg

result

6.6

39.6

48.3

21.1

8.5

444.6

971.6

57.2

19.4

111.1

139.2

[0024] (1) At room temperature, the excess sludge in the secondary settling tank of the urban sewage treatment plant is pumped into the sludge heavy metal removal device SBR through the sludge pump. When the excess sludge concentration (MLSS) is 8-12g / L, Dosing ferrous sulfate (FeSO 4 ·7H 2 O) As an energy substrate for the cultivation of acidophilic microorganisms, the perforated pipe provided at the bottom of the reacto...

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Abstract

The present invention discloses process of eliminating heavy metals from city sewage and sludge. The heavy metal eliminating apparatus consists of simplified sequencing batch bioreactor, concentrating and settling tank and pH regulating tank, and the simplified sequencing batch bioreactor as the main treating apparatus operates in the simplified process comprising feeding sludge, aerobic reaction, aerobic sludge elimination and feeding sludge. The main reactor has exhaust ratio designed in optimal sludge inoculating amount, and the un-exhausted sludge is used for the next batch. The present invention has short treating period, and the treated sludge has the contents of residual Cu, Zn, Cd, Ni and other heavy metal reaching relevant standard.

Description

technical field [0001] The invention relates to a method for removing heavy metals which can solve the problem that the concentration of heavy metals in urban sewage sludge exceeds the standard. Background technique [0002] With the increasing rate of urban sewage treatment in our country year by year, the safe disposal and utilization of the huge output of urban sludge has become the key to restrict the healthy development of urban sewage treatment. As a regular product of urban sewage treatment, urban sludge is rich in plant nutrients such as nitrogen, phosphorus, potassium, and organic matter. After harmless and stabilized treatment, it is a good source of fertilizer and a good soil conditioner. Therefore, the agricultural use of urban sewage sludge has gradually attracted people's attention. However, the influent of most sewage treatment plants in my country is the mixed sewage of industrial wastewater and domestic sewage, and the heavy metal elements in it are concent...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/64C02F3/12C02F3/34C02F1/66C02F101/20
CPCY02W10/10
Inventor 黄明张学洪何强王敦球
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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