CN1887734A

CN1887734A - Animal raising waste water sterilizing method

Info

Publication number: CN1887734A
Application number: CNA2006100366437A
Authority: CN
Inventors: 张淑娟; 林亲铁; 江纪修
Original assignee: National Sun Yat Sen University
Current assignee: Sun Yat Sen University; National Sun Yat Sen University
Priority date: 2006-07-21
Filing date: 2006-07-21
Publication date: 2007-01-03
Anticipated expiration: 2026-07-21
Also published as: CN100503461C

Abstract

The present invention relates to sewage treating technology, and is especially animal raising waste water sterilizing method based on the reaction between FeSO4 and H2O2 under acid condition to produce OH free radical for sterilizing. Specifically, the method includes regulating the pH value of animal raising waste water to 4-6, adding FeSO4 to the concentration of 0.02-0.12 mmol/L through stirring, and adding H2O2 solution to the concentration of 0.2-1.2 mmol/L to react for 10 min before exhausting, with the whole process being within 30 min. The method is fast, efficient, simple, convenient and with low toxicity and no secondary.

Description

Sterilization and disinfection method for livestock and poultry breeding wastewater

Technical Field

The invention relates to the field of sewage treatment, in particular to a method for sterilizing and disinfecting livestock and poultry breeding wastewater.

Technical Field

With the rapid development of intensive livestock and poultry farms in China, the discharge and pollution of livestock and poultry wastes caused by the rapid development are more and more serious. The data show that in China, the total amount of the pollution waste formed by livestock and poultry breeding exceeds that of industrial solid waste, and a considerable part of the pollutants directly enter rivers, lakes and seas through surface runoff without purification treatment, so that the nitrogen and phosphorus exceed the standard and the eutrophication is aggravated. More seriously, some of the excrement of sick livestock and poultry inevitably carries oneIf the virus, bacteria, parasite eggs and the like are directly introduced into human environment without treatment, the virus, bacteria, parasite eggs and the like can directly threaten the survival of the livestock and poultry and seriously harm the human health. In recent years, people have been consciously aware that livestock and poultry breeding wastewater cannot be viewed idle any more due to the fact that livestock and poultry suffer from diseases such as avian influenza, SARS virus and schistosomiasis. At present, the domestic and foreign livestock and poultry breeding wastewater sterilization and disinfection methods mainly comprise chlorination disinfection methods (liquid chlorine, sodium hypochlorite, bleaching powder, chlorine dioxide and the like), ultraviolet disinfection methods and ozone disinfection methods. These sterilization and disinfection methods all have their own distinct limitations: physical methods such as ultraviolet rays and the like have no subsequent antivirus function and high treatment cost; the ozone capital construction investment is high, the power consumption is large, the operating cost is high, and the serious corrosionis easy to generate; the liquid chlorine disinfection is ineffective to certain viruses and spores and easy to generate odor, the disinfection effect is easy to be influenced by water quality, water temperature, contact time and pH value, the viruses in the water generate larger resistance to the liquid chlorine disinfection along with the passage of time, and in addition, the adding equipment knot of the liquid chlorine is addedThe structure is complex, the corrosion is easy, and the danger is large; the sodium hypochlorite has relatively large power consumption and salt consumption for disinfection, high operating cost and weak disinfection capability, and waste residues are easily brought in the treatment process; the strong irritant gas generated in the operation process of bleaching powder disinfection is not beneficial to the health of operators, the concentration of the disinfectant is not convenient to control, and residues accumulated in a sewage tank after reaction are easy to cause the blockage of a sewer; the cost of chlorine dioxide disinfection is high, and the generated ClO₂ ^-、ClO₃ ^-Is harmful to health, and the safety needs to be further researched; in addition, almost all the chlorinated disinfectants can react with various organic matters such as humus in water to generate a plurality of carcinogenic, teratogenic and mutagenic halogenated hydrocarbon organic matters.

Disclosure of Invention

The invention aims to provide a rapid, efficient, broad-spectrum and cheap livestock and poultry breeding wastewater disinfection and sterilization method aiming at the defects of various disinfection methods of the existing livestock and poultry breeding wastewater.

A method for disinfecting and sterilizing livestock and poultry breeding wastewater comprises the following steps:

(4) adjusting the pH value of the livestock and poultry breeding wastewater to 4-6;

(5) adding Fe²⁺To make the wastewater Fe²⁺The concentration is 0.02-0.12 mmol/L, and the mixture is fully stirred;

(6) then adding H₂O₂Solution of H in waste water₂O₂The concentration is 0.2-1.2 mmol/L, and the mixture is fully stirred, kept stand and discharged.

The step (1) is to adopt sulfuric acid to adjust the pH value of the livestock and poultry breeding wastewater.

The step (2) is to add newly prepared FeSO₄And (3) solution.

The time for the standing in the above step (3) was 10 minutes.

The invention uses ferrous sulfate and hydrogen peroxide with the mol ratio of 1: 4-1: 12, and the oxidation mechanism can be expressed as follows under the acidic condition:

the hydroxyl radical formed in the process has very active property, the electron affinity is 569.3kJ, the hydroxyl radical is easy to attack high electron cloud dense points, the standard electrode potential reaches 2.80V and is far higher than that of other disinfectants such as O₃(2.07V)、H₂O₂(1.77V)、KMnO₄(1.52V)、ClO₂(1.50V)、Cl₂The oxidation electrode potential of (1.36V) can efficiently, quickly and thoroughly kill the faecal coliform group, pathogenic bacteria and other bacteria and various pathogenic microorganisms in the sewage, and can also thoroughly decompose virus microorganisms with resistance to common disinfectants, and the disinfectant does not contain chlorine and does not produce carcinogens such as organic chloride and the like.

Compared with the prior art, the invention has the following beneficial effects:

(1) the method has low toxicity, and the final product only contains H₂O and FeSO₄No secondary pollution;

(2) the method of the invention really has the functions of disinfection and sterilization and is FeSO₄And H₂O₂The OH free radicals generated by the reaction under the acidic condition have high oxidation potential, short action time, high speed and strong action, the whole treatment process is less than 30 minutes, and the process is simple and convenient to operate;

(3) the method has good disinfection and sterilization effects, the removal rate of faecal coliform bacteria reaches 99%, and pathogenic bacteria are not detected;

(4) the OH free radicals have strong oxidizability, and can effectively decompose organic high molecular compounds in water, oxidize metal ions such as iron and manganese in the water and oxidize and decompose micro organisms scattering light in the water, so that the perception and clarity of the water are greatly improved.

Detailed Description

Example 1

Taking 2 liters of livestock and poultry breeding wastewater, adding 1mol/L sulfuric acid, and adjusting the pH value to 4; then adding ferrous sulfate solution to lead Fe in the wastewater to be²⁺Is 0.02mmol/L, and after sufficient stirring, H is added₂O₂Solution of H in wastewater₂O₂The concentration was 0.5mmol/L, and the mixture was sufficiently stirred, allowed to stand for 10 minutes, and then discharged.

Example 2

Taking 2 liters of livestock and poultry breeding wastewater, adding 1mol/L sulfuric acid, and adjusting the pH value to 4; then adding ferrous sulfate solution to ensure thatFe in wastewater²⁺Is 0.04mmol/L, after fully stirring, H is added₂O₂Solution of H in wastewater₂O₂The concentration was 0.2mmol/L, and the mixture was sufficiently stirred, allowed to stand for 10 minutes, and then discharged.

Example 3

Taking 2 liters of livestock and poultry breeding wastewater, adding 1mol/L sulfuric acid, and adjusting the pH value to 5; then adding ferrous sulfate solution to lead Fe in the wastewater to be²⁺Is 0.06mmol/L, and after fully stirring, H is added₂O₂Solution of H in wastewater₂O₂The concentration was 0.7mmol/L, and the mixture was sufficiently stirred, allowed to stand for 10 minutes, and then discharged.

Example 4

Taking 2 liters of livestock and poultry breeding wastewater, adding 1mol/L sulfuric acid, and adjusting the pH value to 6; then adding ferrous sulfate solution to lead Fe in the wastewater to be²⁺Is 0.08mmol/L, after fully stirring, H is added₂O₂Solution of H in wastewater₂O₂The concentration was 1.0mmol/L, and the mixture was sufficiently stirred, allowed to stand for 10 minutes and then discharged.

Example 5

Taking 2 liters of livestock and poultry breeding wastewater, adding 1mol/L sulfuric acid, and adjusting the pH value to 4; then adding ferrous sulfate solution to lead Fe in the wastewater to be²⁺Is 0.12mmol/L, after fully stirring, H is added₂O₂Solution of H in wastewater₂O₂The concentration was 1.2mmol/L, and the mixture was sufficiently stirred, allowed to stand for 10 minutes, and then discharged.

When the livestock and poultry breeding wastewater discharged in the examples 1-5 is detected, the detection results of faecal coliform group bacteria (MPN/L) are all less than 500/100 mL, roundworm eggs are less than 2.0/L, and salmonella and shigella are not detected.

Claims

1. A method for disinfecting and sterilizing livestock and poultry breeding wastewater is characterized by comprising the following steps:

(1) adjusting the pH value of the livestock and poultry breeding wastewater to 4-6;

(2) adding Fe²⁺To make the wastewater Fe²⁺The concentration is 0.02-0.12 mmol/L, and the mixture is fully stirred;

(3) then adding H₂O₂Solution of H in waste water₂O₂The concentration is 0.2-1.2 mmol/L, and the mixture is fully stirred, kept stand and discharged.

2. The method for disinfecting and sterilizing livestock and poultry breeding wastewater according to claim 1, wherein the pH value of the livestock and poultry breeding wastewater in the step (1) is adjusted by using sulfuric acid.

3. The method for disinfecting and sterilizing livestock and poultry breeding wastewater according to claim 1, wherein step (2) is to add newly prepared FeSO₄And (3) solution.

4. The method for disinfecting and sterilizing livestock and poultry breeding wastewater according to claim 1, wherein the standing time in step (3) is 10 minutes.