CN105600998A

CN105600998A - Method for separating and removing tetracycline antibiotics from livestock/poultry culture wastewater

Info

Publication number: CN105600998A
Application number: CN201610163266.7A
Authority: CN
Inventors: 叶志隆; 楼耀尹; 陈少华
Original assignee: Institute of Urban Environment of CAS
Current assignee: Institute of Urban Environment of CAS
Priority date: 2016-03-22
Filing date: 2016-03-22
Publication date: 2016-05-25

Abstract

The invention relates to a method for separating and removing tetracycline antibiotics from livestock/poultry culture wastewater, particularly a method for lowering tetracycline antibiotic ecological environment risks in the livestock/poultry culture wastewater recycling process, belonging to the field of water pollution control and resource regeneration. The method is characterized by comprising the following steps: adding about 10-100mM of strong electrolytes (NaCl, MgCl2, MgSO4 and salt brine) into the wastewater to increase the ion concentration in the solution; adding acids (hydrochloric acid, nitric acid and sulfuric acid) to regulate the pH value of the wastewater to 1-5, sufficiently stirring to promote destabilization, aggregation and settling of suspended particulate matters and soluble organic matters in the wastewater, and carrying out solid-liquid separation, thereby separating the tetracycline antibiotics from the wastewater. The suspended particulate matters and soluble organic matters in the wastewater are removed, thereby achieving the goal of separating the tetracycline antibiotics, and lowering the antibiotic pollution risks in the livestock/poultry culture wastewater recycling process.

Description

A kind of method of removing TCs in livestock breeding wastewater that separates

Technical field

The invention belongs to water pollution control and resource regeneration field, while being a kind of livestock breeding wastewater recycling, reduce the method for TCs pollution risk.

Background technology

Along with China's scale animal and poultry cultivation industry fast development, waste water of livestock poultry is day by day serious to the pollution problem of surrounding enviroment, becomes a main source of widespread pollution from the overuse of fertilizers and pesticides in rural area. Meanwhile, phosphorus, as requisite resource in daily life and social development, has non-renewable. Current, global phosphorus ore reserves are reducing rapidly, and the recycling that realizes phosphorus has urgent strategic importance. Adopt ammonium magnesium phosphate (MgNH₄PO₄·6H₂O, MAP) from waste water, to reclaim phosphorus be the mainstream technology that current phosphorus in waste water reclaims to method, it can reduce in phosphorus entered environment and causes body eutrophication, and the MAP reclaiming is a kind of good slow release fertilizer, can directly apply to agricultural production. Simultaneously owing to being rich in the nutriments such as organic matter, nitrogen, phosphorus in livestock breeding wastewater, conventionally after the PROCESS FOR TREATMENT such as anaerobic fermentation, oxidation pond, also utilize in field as rich water, this had both saved processing cost, also promoted Nutrient Cycling utilization, the farmland utilization of livestock breeding wastewater is all carried out by the countries such as current China, the U.S., Europe.

TCs (Tetracyclines, TCs) is extensive pedigree antibiotic, is widely used in livestock and poultry breeding industry, in animal feed, add, for prevention and treatment Animal diseases, can promote growth of animals or poultry, improve food utilization efficiency, reduce the live pig death rate. But livestock and poultry cultivation family is meeting excessive interpolation TCs in feed conventionally, improve the economic interests of livestock and poultry cultivation. The TCs adding has and exceedes 70% amount and can not be absorbed by livestock and poultry, and by the ight soil and urine entered environment of livestock and poultry, the TCs that causes waste water of livestock poultry to contain high concentration. TCs residual in environment not only can suppress or kill microorganisms, also can induced environment in indigenous microorganism develop immunity to drugs. Therefore, in the time of waste water of livestock poultry recycling pouring crops, may make antibiotic accumulate in " soil-crop-human body " this chain, thus harmful to human and ecosystem health. Conventional TCs comprises tetracycline, aureomycin, fortimicin, methacycline, terramycin, dimethylamino tetracycline etc.

The solubility of TCs in water is less, but easily combines closely by suspension particle (SS) and dissolved organic matter (DOM) in the effects such as hydrogen bond, metal ion bridge formation, Electrostatic Absorption and waste water of livestock poultry. The TCs existing with these two kinds of forms accounts for the 70-80% of TCs total amount in breeding wastewater. Add after strong electrolyte to waste water, can effectively compress the surface electric double layer of SS and DOM, greatly reduce its exclusion energy, thereby cause SS and DOM to condense, then, by regulating pH, change the surface charge of SS and DOM, impel SS and DOM unstability precipitation. And the tangential force that mechanical agitation forms also can be accelerated DOM sedimentation. Therefore, can reach the object of removing TCs in waste water of livestock poultry by the coagulative precipitation of SS and DOM.

Summary of the invention

High for TCs content in livestock breeding wastewater, when recycling, there is the problem of ecological and health risk, the present invention proposes a kind of method of removing TCs in livestock breeding wastewater that separates, and it is characterized in that described method step is: first to the strong electrolyte (NaCl, the MgCl that add about 10-100mmol/L in waste water₂、MgSO₄And bittern), increase the ion concentration in solution, then add strong acid (hydrochloric acid, nitric acid and sulfuric acid), the pH of waste water is adjusted to 1-5, carry out stirring and impelling SS and DOM unstability reunion sedimentation in waste water fully, realize Separation of Solid and Liquid. The TCs removing in waste water of livestock poultry be can effectively separate by above-mentioned steps, ecology and health risk that waste water of livestock poultry recycling may cause reduced.

Detailed description of the invention

Embodiment 1:

Certain waste water of raising pigs, initial pH value 7.2, suspended particulate substance 645mg/L, tetracycline 300 μ g/L, NH₄ ⁺And PO₄ ^3-Concentration is respectively 560mg/L and 73mg/L. First add the NaCl of 100mM, then drip 1+1HCl the pH of solution is adjusted to 3, fully stir 30min(200rpm), then staticly settle. Get the supernatant after precipitation, the content of measuring tetracycline in supernatant is 11 μ g/L, and the separation rate of tetracycline from waste water reaches 96.3%.

Embodiment 2:

Certain cowboying waste water, initial pH value 7.3, suspended solid 400mg/L, tetracycline 2mg/L, NH₄ ⁺And PO₄ ^3-Concentration is respectively 1080mg/L and 69mg/L. First add the NaCl of 200mM, then drip 1+1HNO₃The pH of solution is adjusted to 2, fully stirs 50min(150rpm), then leave standstill centrifugal filtration. Get the supernatant after filtration, measure the concentration of the tetracycline in supernatant, after testing, in waste water, the content of tetracycline is 20 μ g/L, and the separation rate of tetracycline from waste water reaches 99%.

Claims

1. one kind separates the method for removing TCs in livestock breeding wastewater, it is characterized in that described method step is: first to the strong electrolyte that adds about 10-100mmol/L in waste water, increase the ion concentration in solution, again the pH of waste water is adjusted to 1-5, then stir fully, impel suspended particulate substance and dissolved organic matter unstability reunion sedimentation in waste water, carry out Separation of Solid and Liquid. Be the TCs in separable waste water by above-mentioned steps.

2.According to claimA kind of method of removing TCs in livestock breeding wastewater that separates described in 1, is characterized in that described strong electrolyte comprises NaCl, MgCl₂、MgSO₄, bittern, addition is that every liter of waste water adds 10-100mmol/L. .

3.A kind of method of removing TCs in livestock breeding wastewater that separates according to claim 1, it is characterized in that described TCs comprises tetracycline, aureomycin, fortimicin, methacycline, terramycin, dimethylamino tetracycline, and their derivative.