Cohesive action nutrient source SRB sewage sludge immobilization particle, production and uses in treating heavy metal wastewater thereof

A nutrient source and heavy metal technology, applied in the field of environmental engineering, can solve the problems of difficult utilization of organic carbon sources, secondary pollution of organic matter, high COD of effluent, and achieve the effect of avoiding direct poisoning, high treatment efficiency and simple treatment process

Active Publication Date: 2009-04-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Judging from previous research and feedback from engineering practice, there are two major deficiencies in the current SRB method. One is that the existing technology, whether it is free SRB or carrier SRB, is difficult to obtain due to the direct contact between SRB and metal ions in wastewater. Avoid the poisonous effect of objectively existing metal ions; the second is that the organic carbon source necessary for the growth of SRB added is difficult to be fully utilized, and the COD of the effluent is high, resulting in the secondary pollution of organic matter in the process of treating inorganic heavy metal wastewater

Method used

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  • Cohesive action nutrient source SRB sewage sludge immobilization particle, production and uses in treating heavy metal wastewater thereof
  • Cohesive action nutrient source SRB sewage sludge immobilization particle, production and uses in treating heavy metal wastewater thereof
  • Cohesive action nutrient source SRB sewage sludge immobilization particle, production and uses in treating heavy metal wastewater thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1, after washing and removing impurities from the urban sewage treatment plant, put the remaining sludge into the sludge bottle, and add the culture medium (component KH 2 PO 4 0.5g / L, NH 4 Cl 1.0g / L, MgSO 4 ·7H 2 O 0.06g / L, CaSO 4 1.0g / L, FeSO 4 ·7H 2 O 0.01g / L, Na 2 SO 4 4.5g / L, CaCl 2 ·H 2 O 0.06g / L, sodium lactate 3.5g / L), after sealing, pass nitrogen for 30 minutes, put the sludge bottle into a biochemical incubator for cultivation at 30°C, replace part of the medium every day, pass nitrogen, and the cultivation is completed in 7-10 days , to get SRB sludge.

[0050] Step 2: Take out the SRB sludge mixture, and centrifuge at 3000r / min for 10min to obtain SRB sludge; weigh a certain amount of polyvinyl alcohol (PVA) and place it in deionized water for heating and dissolving. After cooling to 40°C, the SRB Add sludge and activated carbon, stir evenly, and its concentration (wt%) is about 30% SRB sludge, 9% PVA, 5% activated carbon, and then use a p...

Embodiment 2

[0054] The comparison of the effects of different SRB methods in treating zinc-containing wastewater is shown in Table 1. The cohesive nutrient source SRB pellets are prepared in the same way as in Example 1; the free SRB sludge is obtained from step 1 in Example 1; the SRB pellets are obtained from step 2 in Example 1, and the pellets are sterilized in a sterilizing pot After that, a blank pellet is obtained. The data in the table are the statistical results after multiple experiments. The data in the table shows that the removal of heavy metal ions and the reduction of sulfate radical by cohesive nutrient source SRB pellets reach 99% and 95% respectively. The COD value of the effluent is also controlled below the national standard of 120mg / L (GB 8978-1996). The amount of sodium lactate adsorbed inside the cohesive nutrient source SRB pellets is 62mg / g (sodium lactate / ball), which is equivalent to 2907.8mg / L of COD. If an external method is used, the same amount of sodium l...

Embodiment 3

[0058] Prepare cohesive nutrient source SRB immobilized pellets according to Example 1, under anaerobic conditions, 30°C, shaking rate 100rpm, treat 200mg / L zinc-containing wastewater, after the sodium lactate carbon source in the pellets is exhausted, wash, and follow the implementation In example 1, step 3 regenerates nutrient source, and the effect of treating zinc-containing wastewater four times is as follows image 3 shown. Four times of regeneration, the zinc removal rate exceeds 99% each time.

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Abstract

The invention discloses a cohesive nutrient source SRB sludge immobilized particle, preparation thereof, and a method for heavy metal waste water treatment. In order to avoid the poison of high-concentration metallic ions to SRB and control the COD concentration of outputted water, SRB sludge and a carbon source fixing material are jointly embedded in the same particle pellet. The embedded pellet is used for treating heavy metal waste water after adsorbing the cohesive organic carbon source. The removal ratio of the metallic ions is as high as 99 percent, and the COD concentration in the outputted water is lower than 120mg/L. The concentration of the metallic ions in the inputted water is allowed to reach a g/L level; and the embedded pellet can be reused. The invention can be used for treating heavy metal waste water with high, medium and low concentration, and can also be used for the precipitation and recovery of the heavy metal in the water.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a cohesive nutrient source SRB sludge immobilized particle, its preparation and its application in treating heavy metal wastewater. Background technique [0002] Heavy metals are persistent pollutants in the environment, with high toxicity and serious pollution. Among them, 9 kinds of lead, copper, nickel, cadmium, chromium, mercury, etc. have been included in the "blacklist" of 68 kinds of pollutants that are prioritized in my country's water. With the increasing production activities such as mining, smelting and processing of heavy metals, the heavy metal wastewater produced has greatly increased both in quantity and in types. Caused a lot of heavy metals to enter the ecosystem, causing serious environmental pollution and waste of resources. The biological precipitation method mainly uses microbial metabolic activities to convert heavy metals in wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 闵小波柴立元王云燕彭兵唐宁方艳王娜王璞杨志辉王海鹰黄燕
Owner CENT SOUTH UNIV
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