CN105859052A - Environment-friendly purification method for domestic sewage - Google Patents

Abstract

The invention discloses an environment-friendly purification method for domestic sewage, which comprises the following steps: discharge the domestic sewage into a sedimentation tank for static precipitation, filter after standing for 4 to 8 hours, discharge it from the sedimentation tank into an anaerobic reaction tank, and discharge it from the anaerobic reaction tank The oxygen reaction tank is discharged into the neutralization tank, the neutralization tank is discharged into the oxidation reaction tank, and the oxidation reaction tank is discharged into the aerobic reaction tank, and the pollutants in the domestic sewage are decomposed by aerobic activated sludge; the temperature is controlled at 18~ 23°C, the reaction time is 20-24 hours; discharge from the aerobic reaction tank into the adsorption tank, add activated carbon powder into the adsorption tank for stirring and adsorption, and then filter; discharge from the adsorption tank into the disinfection tank, add disinfectant into the disinfection tank for disinfection Disinfect and form reclaimed water to get rid of. The present invention can carry out multi-level and high-efficiency purification treatment on the water body by rationally configuring the reaction steps of filtration, anaerobic, aerobic and the like. The purification effect is good, the raw material cost is low, and the method is suitable for popularization and use in a large scale.

Description

A kind of environment-friendly purification method of domestic sewage

technical field

The invention relates to the technical field of water body purification, in particular to an environment-friendly purification method for domestic sewage.

Background technique

Domestic wastewater is the sewage produced in the process of human life, and it is one of the main sources of pollution of water bodies. Mainly feces and washing sewage. The amount of domestic sewage discharged per person per day in a city is 150-400L, which is closely related to the living standard. Domestic sewage contains a large amount of organic matter, such as cellulose, starch, sugar and fatty protein; it also often contains pathogenic bacteria, viruses and parasite eggs; inorganic salts such as chloride, sulfate, phosphate, bicarbonate and sodium, Potassium, calcium, magnesium, etc. The general feature is high nitrogen, sulfur and phosphorus content, and the post-processing is relatively difficult. People should protect water resources. China's national conditions are quite special. The per capita possession of water resources is small and the spatial distribution is uneven. With the acceleration of urbanization and industrialization in China, the demand gap for water resources is also increasing. In this context, the sewage treatment industry has become an emerging industry, and is currently in the same important position as the tap water production, water supply, drainage, and reclaimed water reuse industries.

Although the municipality has invested a lot of money to treat sewage, there are many methods in the existing technology that can effectively remove ammonia, such as physical methods including reverse osmosis, distillation, and soil irrigation; chemical methods include ion exchange, ammonia stripping, and chemical precipitation. method, breakpoint chlorination, electrodialysis, electrochemical treatment, catalytic cracking; biological methods include nitrification and algae cultivation, but the physical method has poor treatment effect. Compared with chemical methods, biological methods have the following advantages in treating wastewater: 1) each Chemical products are highly targeted products, which may fail when they encounter other chemical substances, while biological agents have a spectrum of removal of pollutants; 2) Chemical products can temporarily eliminate certain harmful substances and cover up odors , but cannot prevent the generation of harmful substances; 3) After using chemical products, there will be residues in the water body, which may cause secondary pollution. The natural microorganisms contained in biological preparations do not contain pathogenic bacteria and pathogens. Under the catalysis of enzymes, these microorganisms feed on the organic nutrients in sewage. When the sewage is purified, these microorganisms will gradually grow with the reduction of pollutants 4) Non-toxic, non-corrosive, easy to use, basically no need to add equipment or engineering, saving capital investment. However, microbial treatment of sewage is likely to cause secondary pollution of water by microorganisms, and how to treat microorganisms is also a technical problem that needs to be solved. In the field of environmental protection, how to purify domestic wastewater, meet discharge standards and reuse is a technical problem that needs to be solved.

Chinese invention patent CN 104071902 B discloses a method for treating domestic sewage, which realizes effective treatment of domestic sewage. However, this treatment method has no obvious effect on reducing the chemical oxygen demand and chroma of the water body, and the cost of required raw materials is relatively high.

Contents of the invention

The technical problem to be solved by the present invention is to provide an environment-friendly purification method for domestic sewage, which can solve the deficiencies of the prior art, improve the purification effect of domestic sewage, and reduce the cost of raw materials.

In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

An environmental protection purification method for domestic sewage, comprising the following steps:

A. Discharge the domestic sewage into the sedimentation tank for static sedimentation, and filter it after standing for 4 to 8 hours;

B. Discharge the domestic sewage from the sedimentation tank into the anaerobic reaction tank, and use the anaerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 27°C to 30°C, and the reaction time is 12 to 15 hours;

C. Discharge the domestic sewage from the anaerobic reaction tank into the neutralization tank, adjust the pH value of the water body to 7.5-8, add flocculant for precipitation, and then filter;

D. Discharge the domestic sewage from the neutralization tank into the oxidation reaction tank, pass ozone into the oxidation reaction tank, and oxidize the harmful substances in the water body;

E. Discharge the domestic sewage from the oxidation reaction tank into the aerobic reaction tank, and use the aerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 18-23 ° C, and the reaction time is 20-24 hours;

F. Discharge domestic sewage from the aerobic reaction tank into the adsorption tank, add activated carbon powder into the adsorption tank for stirring and adsorption, and then filter;

G. Discharge domestic sewage from the adsorption pool into the disinfection pool, add disinfectant to the disinfection pool for disinfection, and form reclaimed water to be discharged.

As a preference, in step C, the flocculant includes,

17-20wt% of ferric citrate, 4.5-6wt% of aluminum chloride, 10-12wt% of acetyl tributyl citrate, 2.5-5wt% of 3-aminocrotonate methyl ester, 7.5-10wt% of 4- Bromoanisole, the balance is polyacrylamide.

Preferably, in step D, the amount of ozone introduced is 3.5-4 L/m ³ ·min, and the time of introduction is 1-2 hours.

Preferably, in step E, the aerobic activated sludge is placed on a bracket 0.2-0.3m away from the water surface, the aeration disk is installed at the bottom of the aerobic reaction tank, and a filter screen is arranged in the middle of the aerobic reaction tank.

As preferably, in step G, the disinfectant includes,

3.5-4wt% of 8-hydroxyquinoline, 5-7wt% of epichlorohydrin, 10-15wt% of sodium silicate, 3.5-5wt% of 2,6-dimethoxybenzoic acid, 0.5-0.75wt % m-cresyl acetate, 8-15 wt% 2-methyl-2-hexanol, and the balance is calcium hypochlorite.

The beneficial effect brought by the adoption of the above technical solution is that the present invention can carry out multi-level and high-efficiency purification treatment on the water body by rationally configuring the reaction steps such as filtration, anaerobic, and aerobic. The purification effect is good, the raw material cost is low, and the method is suitable for popularization and use in a large scale.

detailed description

In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

An environmental protection purification method for domestic sewage, comprising the following steps:.

A. Discharge the domestic sewage into the sedimentation tank for static precipitation, and filter after standing for 7 hours;

B. Discharge the domestic sewage from the sedimentation tank into the anaerobic reaction tank, and use anaerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 30°C, and the reaction time is 15 hours;

C. Discharge the domestic sewage from the anaerobic reaction tank into the neutralization tank, adjust the pH value of the water body to 7.5-8, add flocculant for precipitation, and then filter;

D. Discharge the domestic sewage from the neutralization tank into the oxidation reaction tank, pass ozone into the oxidation reaction tank, and oxidize the harmful substances in the water body;

E. Discharge the domestic sewage from the oxidation reaction tank into the aerobic reaction tank, and use the aerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 20°C, and the reaction time is 22 hours;

F. Discharge domestic sewage from the aerobic reaction tank into the adsorption tank, add activated carbon powder into the adsorption tank for stirring and adsorption, and then filter;

G. Discharge domestic sewage from the adsorption pool into the disinfection pool, add disinfectant to the disinfection pool for disinfection, and form reclaimed water to be discharged.

In step C, the flocculant includes,

20wt% ferric citrate, 5.5wt% aluminum chloride, 10wt% acetyl tributyl citrate, 3wt% 3-aminocrotonate methyl ester, 8wt% 4-bromoanisole, the balance is poly Acrylamide.

In step D, the amount of ozone fed is 4 L/m ³ ·min, and the time of feeding is 1 h.

In step E, the aerobic activated sludge is placed on a bracket 0.3m away from the water surface, the aeration plate is installed at the bottom of the aerobic reaction tank, and a filter screen is arranged in the middle of the aerobic reaction tank.

In step G, the disinfectant includes,

4wt% of 8-hydroxyquinoline, 6wt% of epichlorohydrin, 12wt% of sodium silicate, 4wt% of 2,6-dimethoxybenzoic acid, 0.5wt% of m-cresyl acetate, 10wt% of 2-methyl-2-hexanol, the balance being calcium hypochlorite.

Example 2

An environmental protection purification method for domestic sewage, comprising the following steps:.

A. Discharge domestic sewage into the sedimentation tank for static precipitation, and filter after standing for 5 hours;

B. Discharge the domestic sewage from the sedimentation tank into the anaerobic reaction tank, and use the anaerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 28°C, and the reaction time is 12 hours;

C. Discharge the domestic sewage from the anaerobic reaction tank into the neutralization tank, adjust the pH value of the water body to 7.5-8, add flocculant for precipitation, and then filter;

D. Discharge the domestic sewage from the neutralization tank into the oxidation reaction tank, pass ozone into the oxidation reaction tank, and oxidize the harmful substances in the water body;

E. Discharge the domestic sewage from the oxidation reaction tank into the aerobic reaction tank, and use the aerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 20°C, and the reaction time is 20h;

F. Discharge domestic sewage from the aerobic reaction tank into the adsorption tank, add activated carbon powder into the adsorption tank for stirring and adsorption, and then filter;

G. Discharge domestic sewage from the adsorption pool into the disinfection pool, add disinfectant to the disinfection pool for disinfection, and form reclaimed water to be discharged.

In step C, the flocculant includes,

18wt% of ferric citrate, 6wt% of aluminum chloride, 11wt% of acetyl tributyl citrate, 4.5wt% of 3-aminocrotonate methyl ester, 9wt% of 4-bromoanisole, the balance is poly Acrylamide.

In step D, the amount of ozone introduced is 4 L/m ³ ·min, and the time of introduction is 2 hours.

In step E, the aerobic activated sludge is placed on a bracket 0.2-0.3m away from the water surface, the aeration disk is installed at the bottom of the aerobic reaction tank, and a filter screen is arranged in the middle of the aerobic reaction tank.

In step G, the disinfectant includes,

4wt% of 8-hydroxyquinoline, 5wt% of epichlorohydrin, 10wt% of sodium silicate, 4wt% of 2,6-dimethoxybenzoic acid, 0.6wt% of m-cresyl acetate, 10wt% of 2-methyl-2-hexanol, the balance being calcium hypochlorite.

Using embodiment 1 (comparative example) in the patent cited in embodiment 2 and the background technology to carry out processing experiment comparison for two samples that the same row of pipelines is sampled, the results are as follows:

Table 1 Comparative example

category Chemical oxygen demand (mg/L) Chroma Ammonia nitrogen (mg/L) before processing 2750 280 435 after treatment 41 56 2.3

Table 2 Embodiments of the present invention

category Chemical oxygen demand (mg/L) Chroma Ammonia nitrogen (mg/L) before processing 2750 280 435 after treatment 19 15 1.9

In addition, after calculation, the cost of raw materials required for processing 1 m of sewage by the method of the present invention is 0.13 yuan, while the cost of raw materials required for processing 1 ^{m of} sewage by the method of the comparative example is 0.32 yuan. Using the treatment method of the invention can reduce the cost of raw materials by more than half.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (5)

1. an environmental protection purification method of domestic sewage, is characterized in that comprising the following steps:. A. Discharge the domestic sewage into the sedimentation tank for static sedimentation, and filter it after standing for 4 to 8 hours; B. Discharge the domestic sewage from the sedimentation tank into the anaerobic reaction tank, and use the anaerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 27°C to 30°C, and the reaction time is 12 to 15 hours; C. Discharge the domestic sewage from the anaerobic reaction tank into the neutralization tank, adjust the pH value of the water body to 7.5-8, add flocculant for precipitation, and then filter; D. Discharge the domestic sewage from the neutralization tank into the oxidation reaction tank, pass ozone into the oxidation reaction tank, and oxidize the harmful substances in the water body; E. Discharge the domestic sewage from the oxidation reaction tank into the aerobic reaction tank, and use the aerobic activated sludge to decompose the pollutants in the domestic sewage; the temperature is controlled at 18-23 ° C, and the reaction time is 20-24 hours; F. Discharge domestic sewage from the aerobic reaction tank into the adsorption tank, add activated carbon powder into the adsorption tank for stirring and adsorption, and then filter; G. Discharge domestic sewage from the adsorption pool into the disinfection pool, add disinfectant to the disinfection pool for disinfection, and form reclaimed water to be discharged. 2. The environmental protection purification method of domestic sewage according to claim 1, characterized in that: in step C, the flocculant comprises, 17-20wt% of ferric citrate, 4.5-6wt% of aluminum chloride, 10-12wt% of acetyl tributyl citrate, 2.5-5wt% of 3-aminocrotonate methyl ester, 7.5-10wt% of 4- Bromoanisole, the balance is polyacrylamide. 3. The environmental-friendly purification method of domestic sewage according to claim 1, characterized in that: in step D, the amount of ozone introduced is 3.5-4 L/m ³ ·min, and the time of introduction is 1-2 hours. 4. The environmental protection purification method of domestic sewage according to claim 1, characterized in that: in step E, the aerobic activated sludge is placed on a bracket 0.2-0.3m away from the water surface, and the aeration disc is installed on the aerobic At the bottom of the reaction tank, a filter screen is arranged in the middle of the aerobic reaction tank. 5. The environmental protection purification method of domestic sewage according to claim 1, characterized in that: in step G, the disinfectant comprises, 3.5-4wt% of 8-hydroxyquinoline, 5-7wt% of epichlorohydrin, 10-15wt% of sodium silicate, 3.5-5wt% of 2,6-dimethoxybenzoic acid, 0.5-0.75wt % m-cresyl acetate, 8-15 wt% 2-methyl-2-hexanol, and the balance is calcium hypochlorite.