Method for removing tetracycline antibiotics in wastewater phosphorus recovery product

A technology for recovery of tetracyclines and phosphorus, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as difficult separation, mixing of tetracycline antibiotics and products, and improve quality and reduce ecology Environmental risk, effect of removal of tetracycline antibiotics

Active Publication Date: 2014-07-30
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 830 mg / L, oxytetracycline 1 mg / L, NH 4 + and PO 4 3- The concentrations were 340 mg / L and 93 mg / L, respectively. Firstly, 10 mg / L polyaluminum chloride (PAC) flocculant was added to carry out pre-coagulation treatment of the aquaculture wastewater, fully stirred, and then stood to filter. Take the filtered supernatant, add NaOH to adjust the pH value to 9.0, stir well, then add 80 mg / 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 min, let it stand for 10 min, 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 solids in the product were 0.5 mg / L, and oxytetracycline was not detected.

Embodiment 2

[0010] A livestock and poultry breeding wastewater, initial pH value 7.3, suspended solids 1230 mg / L, tetracycline 3 mg / L, NH 4 + and PO 4 3- The concentrations were 780 mg / L and 65 mg / L, respectively. Firstly, 5 mg / L polyacrylamide (PAM) flocculant was added to carry out pre-coagulation treatment of the aquaculture wastewater, fully stirred, and then stood and filtered. Take the filtered supernatant, add NaOH to adjust the pH value to 8.8, stir well, then add 60 mg / 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 min, let it stand for 10 min, 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 solids in the product were 80 mg / L, and tetracycline was not detected.

Embodiment 3

[0012] Anaerobic supernatant of municipal sludge, initial pH value 7.5, suspended solids 2200 mg / L, tetracycline (Tetracycline) 0.5 mg / L, NH 4 + and PO 4 3- The concentrations were 1050 mg / L and 120 mg / 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 min, let it stand for 10 min, 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 25 mg / L, and tetracycline was not detected.

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Abstract

The invention relates to a method for removing tetracycline antibiotics in a wastewater phosphorus recovery product, belonging to the fields of water pollution control and resource regeneration, particularly a method for lowering ecological environment risk of a phosphorus recovery product. The method comprises the following steps: pretreating to remove suspended and colloidal organic substances in phosphorus-containing wastewater, and carrying out solid-liquid separation; regulating the pH value of the supernate to 8.0-11.0, adding a certain ratio of magnesium source or calcium source to perform magnesium ammonium phosphate or calcium phosphate crystallizing precipitation reaction, and adding alkali to control the pH value of the reaction at 8.0-11.0 until the reaction finishes; and carrying out solid-liquid separation to obtain the precipitate phosphorus recovery product. The steps can be carried out to remove the tetracycline antibiotics in the wastewater phosphorus recovery product. On the premise of ensuring the phosphorus recovery yield, the method can achieve the goal of removing tetracycline antibiotics by removing the suspended and colloidal organic substances in the wastewater, thereby lowering the ecological environment risk which can be caused by the phosphorus recovery product.

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 Applications(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
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