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A method for removing tetracycline antibiotics in wastewater phosphorus recovery products

A tetracycline and phosphorus recovery technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of difficult separation, mixing of tetracycline antibiotics and products, etc. Environmental risks, effects of removal of tetracyclines

Active Publication Date: 2016-06-29
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

[0005] Aiming at the problem that tetracycline antibiotics are mixed with products 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 method for removing tetracycline antibiotics when recovering phosphorus from wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A livestock and poultry breeding wastewater, initial pH value 7.0, suspended solids 830mg / L, oxytetracycline 1mg / L, NH 4 + and PO 4 3- The concentrations were 340mg / L and 93mg / L respectively. First, add 10mg / 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 9.0, 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 9.0. Stop stirring after 30 minutes, let it stand for 10 minutes, collect the bottom product, freeze-dry and store it. Detected by gravimetric method and liquid chromatography-mass spectrometry / mass spectrometry (LC-MS / MS), the suspended solid in the product was 0.5mg / L, and oxytetracycline was not detected.

Embodiment 2

[0010] A livestock and poultry breeding wastewater, initial pH value 7.3, suspended solids 1230mg / L, tetracycline 3mg / L, NH 4 + and PO 4 3- The concentrations were 780mg / L and 65mg / L respectively. First, add 5mg / L polyacrylamide (PAM) flocculant to carry out pre-coagulation treatment of the aquaculture wastewater, fully stir, and then stand and filter. Take the filtered supernatant, add NaOH to adjust the pH value to 8.8, stir well, then add 60mg / L Mg 2+ Carry out the crystallization reaction of magnesium ammonium phosphate, and control the pH value to be stable at 8.8. Stop stirring after 30 minutes, let it stand for 10 minutes, collect the bottom product, and store it after freeze-drying. Detected by gravimetric method and liquid chromatography-mass spectrometry / mass spectrometry (LC-MS / MS), the suspended solid in the product was 80mg / L, and tetracycline was not detected.

Embodiment 3

[0012] Anaerobic supernatant of urban sludge, initial pH value 7.5, suspended solids 2200mg / L, tetracycline (Tetracycline) 0.5mg / L, NH 4 + and PO 4 3- The concentrations are 1050mg / L and 120mg / L respectively. 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, then add 120mg / 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 10 minutes, collect the bottom product, freeze-dry and store it. Detected by gravimetric method and liquid chromatography-mass spectrometry / mass spectrometry (LC-MS / MS), the suspended solid in the product was 25 mg / L, and tetracycline was not detected.

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Abstract

The invention discloses a method for removing tetracycline antibiotics 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. Through the above steps, the tetracycline antibiotics in the waste water phosphorus recovery product can be removed. On the premise of ensuring the yield of phosphorus recovery, the invention achieves the purpose of removing tetracycline antibiotics by removing suspended and colloidal organic matter in wastewater, and reduces the ecological environment risk 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 tetracycline antibiotics in products when phosphorus is recovered from phosphorus-containing wastewater. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/38
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