A method for removing heavy metals in wastewater phosphorus recovery products

A phosphorus recovery and heavy metal technology, applied in the direction of non-metallic elements, chemical instruments and methods, phosphorus compounds, etc., can solve problems such as mixing and difficult separation, achieve the effect of removing heavy metals, improving quality, and reducing ecological and environmental risks

Active Publication Date: 2016-06-01
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that heavy metals such as Cu, Cr, As, and Pb are mixed in the product and difficult to separate when phosphorus is recovered from waste water such as livestock and poultry breeding wastewater and urban sludge anaerobic supernatant, the invention provides a waste water phosphorus recovery product for heavy metals. removal method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] A livestock and poultry breeding wastewater, initial pH value 6.7, suspended solids 1570mg / L, NH 4 + and PO 4 3- Concentrations were 920mg / L and 103mg / L, heavy metals Cu15mg / L, Cr0.8mg / L, Zn30mg / L, Cd1mg / L, Pb0.4mg / L, As2.5mg / L. First, add 12mg / L polyaluminum chloride (PAC) flocculant to carry out coagulation pre-treatment on the aquaculture wastewater, fully stir, and then stand and filter. Take the filtered supernatant, add NaOH to adjust the pH value to 9.2, stir well, then add 100mg / L Mg 2+ Carry out the crystallization reaction of magnesium ammonium phosphate, and control the pH value to be stable at 9.2. Stop stirring after 40 minutes, let it stand for 20 minutes, collect the bottom product, and store it after drying. After testing, the suspended solid in the product is 10mg / L, the heavy metal Cu0.006mg / Kg, Cr is not detected, Zn0.02mg / Kg, Cd is not detected, Pb is not detected, and As is not detected.

Embodiment 2

[0009] Anaerobic supernatant of urban sludge, initial pH value 7.2, suspended solids 2500mg / L, NH 4 + and PO 4 3- Concentrations were 850mg / L and 150mg / L, heavy metals Cu8mg / L, Cr2.5mg / L, Zn10mg / L, Cd0.9mg / L, Pb3.5mg / L, As2mg / L. Nanofiltration membranes are used for pretreatment of wastewater. Take the supernatant after nanofiltration, add NaOH to adjust the pH value to 9.0, stir well, and then add 140mg / L Mg 2+ Carry out the crystallization reaction of magnesium ammonium phosphate, and control the pH value to be stable at 9.0. Stop stirring after 30 minutes, let it stand for 20 minutes, collect the bottom product, and store it after freeze-drying. After testing, the suspended solid in the product is 5mg / L, the heavy metal Cu0.005mg / Kg, Cr is not detected, Zn0.01mg / Kg, Cd is not detected, Pb is not detected, and As is not detected.

Embodiment 3

[0011] A livestock and poultry breeding wastewater, initial pH value 7.1, suspended solids 2310mg / L, NH 4 + and PO 4 3- Concentrations were 1080mg / L and 86mg / L, heavy metals Cu35mg / L, Cr0.5mg / L, Zn35mg / L, Cd0.08mg / L, Pb1.0mg / L, As5.5mg / L. First, add 10mg / L polyacrylamide (PAM) flocculant to coagulate the aquaculture wastewater before treatment, fully stir, and then stand and filter. Take the filtered supernatant, add NaOH to adjust the pH value to 9.5, stir well, then add 80mg / L Mg 2+ Carry out the crystallization reaction of magnesium ammonium phosphate, and control the pH value to be stable at 9.5. Stop stirring after 25 minutes, let it stand for 20 minutes, collect the bottom product, and store it after drying. After testing, the suspended solid in the product is 6mg / L, the heavy metal Cu0.002mg / Kg, Cr is not detected, Zn0.005mg / Kg, Cd is not detected, Pb is not detected, and As is not detected.

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Abstract

The invention discloses a method for removing heavy metals in wastewater phosphorus recovery products, belongs to the field of water pollution control and resource regeneration, and is a method for reducing the ecological environment risk of phosphorus recovery products. The method of the present invention is as follows: first adopt the pretreatment method to remove the suspended and colloidal organic matter in phosphorus-containing wastewater, and then separate the solid from the liquid; adjust the pH value of the supernatant to 8.0-11.0, add a certain proportion of magnesium source or The calcium source is subjected to ammonium magnesium phosphate or calcium phosphate crystallization precipitation reaction, and the pH value of the reaction is stabilized at 8.0-11.0 by adding alkali until the reaction is completed; then solid-liquid separation, the obtained precipitate is the phosphorus recovery product. The heavy metals in waste water phosphorus recovery products can be removed through the above steps. On the premise of ensuring the yield of phosphorus recovery, the invention achieves the purpose of removing heavy metals by removing suspended and colloidal organic matter in waste water, and reduces ecological environment risks that may be caused by phosphorus recovery products.

Description

technical field [0001] The invention belongs to the field of water pollution control and resource regeneration, and relates to a method for removing heavy metals in products when phosphorous wastewater is used for phosphorus recovery. Background technique [0002] The presence of a large amount of phosphorus in wastewater is one of the main reasons for water eutrophication, which has a serious negative impact on the quality of water environment and has become one of the major environmental problems at present. Phosphorus is an indispensable nutrient element for all life forms, and it is also an important chemical raw material. Especially the limited phosphate rock resources in nature make it necessary to realize the recycling of phosphorus resources. Phosphorus recovery from wastewater is an important way to alleviate water pollution and phosphorus resource shortage. At present, the main process for phosphorus recovery from wastewater such as aquaculture wastewater and urba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01B25/45C01B25/32C02F101/20C02F101/22
Inventor 叶志隆邓玉君陈少华叶欣林向宇张召基
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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