CN114956471A

CN114956471A - Artificial soil domestic sewage treatment system and method

Info

Publication number: CN114956471A
Application number: CN202210678674.1A
Authority: CN
Inventors: 倪建忠; 钟蝉伊
Original assignee: Hubei Xingxin Ecological Technology Co ltd
Current assignee: Hubei Xingxin Ecological Technology Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-08-30

Abstract

The invention discloses an artificial soil domestic sewage treatment system and a method thereof, belonging to the field of sewage treatment, and comprising a gas absorption tower, a septic tank, an oil separation tank, a soil depth process tank and a steam overflow well which are sequentially arranged along the sewage discharge direction, wherein the inner bottom of the steam overflow well is provided with a submersible pump, and the output end of the submersible pump is communicated with a water using pipe which extends to the outer side of the steam overflow well and is communicated with water using equipment. The artificial soil domestic sewage treatment system and the method thereof have the advantages of high and stable effluent quality, low yield of no excess sludge, no limitation of setting occasions, convenient operation and management, no need of power equipment and waste gas absorption and filtration, and solve the problems of high operation cost and maintenance cost, complex technology, lack of trained professional operation managers, inadequate management and maintenance, no facility operation management responsibility of a management main body, difficult maintenance and management, waste gas pollution and the like in the prior art.

Description

Artificial soil domestic sewage treatment system and method

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to an artificial soil domestic sewage treatment system and an artificial soil domestic sewage treatment method.

Background

In recent years, although the sewage construction in China is developed rapidly, the facilities of national small sewage treatment plants are in a state of being generally idle, and the facilities fall into the dilemma of 'construction with money and operation without money'. Reasons why sewage treatment facilities are generally idle:

1. high operating and maintenance costs;

2. the technology is complex, and trained professional operation managers are lacked;

3. the management and the protection are not in place, and the management main body does not have the facility operation management responsibilities;

4. regardless of the scale, the cost imitates the mechanized centralized treatment process of the city, high standard water quality indexes are pursued blindly, and consequently, the investment and the operating cost of the daily price and the engineering facilities difficult to maintain and manage appear;

5. the existing sewage treatment tank only treats sewage, and waste gas (namely odor or toxic gas) in the sewage treatment tank can be discharged into the air, so that air pollution can be caused, and the health of people can be influenced.

The 'construction with money and operation without money' are dead knots existing in sewage treatment construction, the sewage engineering technology is separated from local social and economic conditions, the result of common idling is caused, effective scientific assessment and supervision are lacked for a sewage treatment technical route, blind investment is caused, and the dilemma that sewage facilities are common idling is caused. The sewage facility with high operation cost and complexity is difficult to continue without subsequent capital investment, and can possibly become a pile of waste copper and iron rotten in the future, so an artificial soil domestic sewage treatment system and a method thereof are provided to solve the problems.

Disclosure of Invention

Aiming at one or more of the defects or the improvement requirements in the prior art, the invention provides an artificial soil domestic sewage treatment system and a method thereof, and the system and the method have the advantages of high and stable effluent quality, no residual sludge, low yield, no limitation of setting occasions, convenience in operation and management, no need of electric equipment and waste gas absorption and filtration.

In order to achieve the aim, the invention provides an artificial soil domestic sewage treatment system which comprises a gas absorption tower, a septic tank, an oil separation tank, a soil depth process tank and a steam overflow well, wherein the soil depth process tank and the steam overflow well are sequentially arranged along the sewage discharge direction;

shed covers are detachably arranged on the septic tank and the oil separation tank, the two shed covers are communicated with a gas absorption tower through two gas pipes, and a paraffin absorption stage and an active carbon absorption stage are arranged in the gas absorption tower;

septic tank and oil removal pond are linked together through the input of bi-pass drain pipe with soil degree of depth technology pond, the output and the excessive vapour well input in soil degree of depth technology pond are linked together through the collector pipe, the outside intercommunication of excessive vapour well has the drain pipe, soil degree of depth technology pond and excessive vapour well all set up in the soil that has the lawn.

As a further improvement of the invention, the soil depth process pool comprises a film arranged in the soil and two water dispersion pipes arranged in the film in parallel, the two water dispersion pipes are communicated with a double-way air pipe, a nylon net is sleeved on the outer side of each water dispersion pipe, broken stones with the diameter of 20-40mm are filled between the water dispersion pipes and the nylon and at the bottom of the film, the soil depth process pool also comprises two brackets positioned in the film, the two brackets are respectively positioned under the nylon net, and river sand is filled between the brackets and the nylon net.

As a further improvement of the invention, the film is in a trapezoidal design, the top of the film is provided with an opening, a gap is reserved between the top opening and the ground surface, and the film is a polyvinyl fluoride film with the thickness of 0.3-0.5 mm.

As a further improvement of the invention, the water outlet of the septic tank and the oil separation tank is higher than the water inlet of the soil depth process tank, and the water inlet of the soil depth process tank is higher than the water outlet.

As a further improvement of the invention, the paraffin absorption stage is arranged below the activated carbon absorption stage, and the top of the gas absorption tower is provided with an exhaust pipe.

The invention also provides a method for treating the artificial soil domestic sewage, which comprises the following steps:

s1: the domestic sewage firstly enters a septic tank, an oil separation tank and other pretreatment facilities, and is subjected to anaerobic fermentation in the septic tank, so that organic matters in the domestic sewage are decomposed, the pollutant load is reduced, meanwhile, the content of nutrients in the sewage is increased, and parasitic ova and pathogenic microorganisms in the sewage are killed;

s2: the odor generated in the sewage pretreatment process enters a gas absorption tower, is filtered by a paraffin absorption stage and an active carbon absorption stage and then is discharged through an exhaust pipe;

s3: the pretreated sewage automatically flows into the soil deep process pool through the bi-pass drain pipe, is treated by the bi-pass drain pipe, then enters the steam overflow well through the water collecting pipe to be collected, and the treated water can be conveyed to water utilization equipment for use after the submersible pump is powered on.

In general, the above technical methods conceived by the present invention have advantageous effects compared to the prior art, including:

1. the quality of the discharged water is high and stable

The treated effluent is extremely clear and tasteless, the quality of the effluent is superior to the quality standard of domestic miscellaneous water issued by the ministry of construction, and the effluent can be directly reused as non-drinking municipal miscellaneous water.

2. No excess sludge and low yield

The system can operate under the condition of no sludge load, realizes zero discharge of sludge and reduces the sludge treatment cost.

3. Is not limited by the setting occasion

The system has simple flow and compact structure, is not limited by the set place, and is suitable for any occasions such as segmented and serial treatment and construction under green belts.

4. Convenient operation and management without power equipment

The power system has no power facility, so that the power system does not need to be managed by professional personnel once being put into operation, power cost and labor cost are avoided, and the operation cost is reduced.

5. Waste gas absorption and filtration

The system treats the generated waste gas while treating the sewage, so that the atmosphere pollution caused by the waste gas is avoided, and the health of people is influenced.

Drawings

FIG. 1 is a schematic diagram of the structural system of the present invention;

FIG. 2 is a side sectional view of the soil depth process tank of the present invention.

In all the figures, the same reference numerals denote the same features, in particular: 1. a gas absorption tower; 1a, paraffin absorption grade; 1b, activated carbon absorption level; 2. a septic tank; 3. an oil separation tank; 4. a soil depth process pond; 41. a film; 42. a water dispersion pipe; 43. a nylon mesh; 44. crushing stone; 45. a bracket; 46. river sand; 5. a gas overflow well; 6. a submersible pump; 7. a water pipe is used; 8. a shed cover; 9. a bi-pass air pipe; 10. a two-way drain pipe; 11. a water collection pipe; 12. and a water discharge pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

An artificial soil domestic sewage treatment system is provided by figures 1-2, which comprises a gas absorption tower 1, a septic tank 2, an oil separation tank 3, a soil depth process tank 4 and a steam overflow well 5 which are sequentially arranged along the sewage discharge direction, wherein a submersible pump 6 is arranged at the inner bottom of the steam overflow well 5, and the output end of the submersible pump 6 is communicated with a water using pipe 7 which extends to the outer side of the steam overflow well 5 and is communicated with water using equipment;

shed covers 8 are detachably arranged on the septic tank 2 and the oil separation tank 3, the two shed covers 8 are communicated with the gas absorption tower 1 through a two-way gas pipe 9, and a paraffin absorption stage 1a and an activated carbon absorption stage 1b are arranged in the gas absorption tower 1;

the septic tank 2 and the oil separation tank 3 are communicated with the input end of the soil depth process tank 4 through a two-way drain pipe 10, the output end of the soil depth process tank 4 is communicated with the input end of the steam overflow well 5 through a water collecting pipe 11, the outer side of the steam overflow well 5 is communicated with a drain pipe 12, and the soil depth process tank 4 and the steam overflow well 5 are both arranged in soil with a lawn.

Specifically, the soil depth process pool 4 comprises a film 41 arranged in the soil and two water dispersion pipes 42 arranged in the film 41 in parallel, the two water dispersion pipes 42 are communicated with the double-vent gas pipe 9, the outer sides of the two water dispersion pipes are sleeved with nylon nets 43, broken stones 44 with the diameters of 20-40mm are filled between the water dispersion pipes 42 and the nylon 43 and at the bottom of the film 41, the soil depth process pool 4 further comprises two brackets 45 arranged in the film 41, the two brackets 45 are respectively arranged under the nylon nets 43, and river sand 46 is filled between the brackets 45 and the nylon nets 43.

Specifically, the film 41 is designed in a trapezoid shape, the top of the film has an opening, a gap is formed between the opening and the ground surface, and the film 41 is a polyvinyl fluoride film with a thickness of 0.3-0.5 mm.

Specifically, the water outlets of the septic tank 2 and the oil separation tank 3 are higher than the water inlet of the soil depth process tank 4, and the water inlet of the soil depth process tank 4 is higher than the water outlet.

Specifically, the paraffin absorption stage 1a is disposed below the activated carbon absorption stage 1b, and the top of the gas absorption tower 1 is provided with an exhaust pipe.

A method for treating domestic sewage of artificial soil comprises the following steps:

s1: the domestic sewage firstly enters the pretreatment facilities such as the septic tank 2, the oil separation tank 3 and the like. The sewage is subjected to anaerobic fermentation in the septic tank 2, wherein organic matters are partially decomposed, so that the pollutant load is reduced, the content of nutrients in the sewage is increased, and further purification and utilization are facilitated. Meanwhile, parasitic ova and pathogenic microorganisms in the sewage are killed by biological antagonism in an anaerobic environment, and excrement in the sewage is subjected to certain harmless treatment;

s2: odor generated in the sewage pretreatment process enters the gas absorption tower 1, is filtered by the paraffin absorption stage 1a and the activated carbon absorption stage 1b in the gas absorption tower and then is discharged through the exhaust pipe, and the paraffin absorption stage 1a and the activated carbon absorption stage 1b can effectively adsorb harmful substances and ozone molecules in the exhaust gas to purify the exhaust gas;

s3: the treated sewage automatically flows into the soil depth process pool 4. Under the control of a water distribution system, sewage is distributed into each infiltration ditch through a water distribution pipe, and because the soil depth process tank 4 specially prepared by the infiltration ditches consists of ideal soil mechanisms and has rich organic matter content, the soil has developed granular structure, high permeability, large adsorption capacity and good permeability. Meanwhile, the soil is rich in nutrients and energy substances necessary for microorganisms, and the appropriate soil properties provide a good living and breeding environment for the soil microorganisms, so that the soil has higher biological activity. After sewage is dosed into the percolation channel, the sewage permeates and rises along the soil, organic matters are removed through a series of actions of physical retention of the soil, soil absorption, microbial decomposition and plant absorption, and organic substances retained in the soil are decomposed into inorganic matters under the catabolism and chemical reaction of the microorganisms, which is a key process for removing organic pollutants;

and (3) removing nitrogen: the nitrogen in the sewage is always removed through ammoniation, nitrification and denitrification. Nitrogen-containing organic matters in the sewage are oxidized and decomposed by the foster type microorganisms in the biological treatment process to be converted into ammonia nitrogen, then the nitrogen-containing organic matters are converted into NO3 by autotrophic nitrifying bacteria, and finally NO 3-is reduced into N2 by the nitrifying bacteria, so that the aim of denitrification is fulfilled. Nitrification and denitrification reactions occur under aerobic and anaerobic conditions, respectively, and thus a shift in the two diametrically opposed reaction conditions must be achieved. The intermittent water distribution conversion of the soil method ensures that the system is in a state of alternate water distribution and drying. Therefore, the conventional biochemical treatment method is difficult to realize the aim of denitrification, and the nitrification and the denitrification can be smoothly completed in the soil depth process tank 4;

removing phosphorus: phosphorus is a limiting nutrient that causes ground water eutrophication. The removal of phosphorus is controlled primarily by the process of the chemical precipitation reaction of phosphorus. Phosphorus in sewage or soil solutions exists as H2PO4- (under acidic conditions) and HPO42- (under alkaline conditions). Different from the high mobility of NH3-N in soil, phosphate ions are easy to chemically react with Ca2+, Al3+, Fe3+ and the like which are abundantly present in soil to generate various insoluble phosphates, which are generally called as phosphorus soil solids;

the absorption of the lawn plants to the nutrient elements is also an important way for sewage purification. The plant can absorb nutrient salts, and animals (such as helminth and nematode) can penetrate through soil particles to loosen soil. The sewage is treated and purified under the physical action and the chemical action of the soil;

the treated water enters the steam overflow well 5 through the water collecting pipe 11 to be collected, and the treated water can be conveyed to water utilization equipment to be used after the submersible pump 6 is powered on.

The invention relates to an artificial soil domestic sewage treatment system and an action mechanism of the method thereof

1. Physical filtration: the pores among the soil particles can intercept and filter suspended particles in the wastewater. The size of the soil particles, the shape, size, distribution of the inter-particle pores, and the nature of the water flow path all affect the physical filtration efficiency. Soil blockage is mainly caused by too many suspended particles, dissolved organic matters are decomposed by microbial metabolites, organic matters are decomposed anaerobically and the like. The control method of the blockage comprises the following steps: 1. the wastewater oil separation tank is strengthened, and the pretreatment management of the septic tank can reduce suspended particles entering a novel artificial soil infiltration field as much as possible. 2. If necessary, alternate rotation connection of irrigation (wet period) and field fallow and drying (dry period) can be adopted, so that the soil sewage interception and filtration capacity can be recovered;

2. physical adsorption and physical deposition: clay minerals and the like in soil can adsorb neutral molecules in soil due to van der waals forces between nonpolar molecules. Part of heavy metal ions in the wastewater are replaced and adsorbed on the surface of soil colloid due to cation exchange, and insoluble matters are generated and fixed in crystal lattices of minerals;

3. physical and chemical adsorption: the metal ions are chelated with inorganic colloid and organic colloid in the soil to form a chelated compound; forming a complex by complexing an organic substance and an inorganic substance; the heavy metal ions are exchanged with the positive ions of the soil and are replaced and adsorbed; certain organic matters and heavy metals in the soil generate adsorbable chelates to be fixed in the crystal lattices of the soil minerals;

4. chemical reaction and precipitation: the heavy metal ions react with certain components of the soil to form refractory compounds which are precipitated. Such as adjusting and changing the oxidation-reduction potential of soil to generate insoluble sulfide; changing the pH can generate metal hydroxide; other chemical reactions can generate metal phosphate, organic medium metal and the like to be deposited in soil;

5. metabolism of microorganisms and decomposition of organic matter: the soil contains a large amount of heterotrophic microorganisms which can carry out biodegradation on suspended organic solids and soluble organic matters in soil particles. In the anaerobic state, the anaerobic bacteria can ferment and decompose organic matters and perform denitrification on nitrite and nitrate.

TABLE 1 Effect of treatment removal

Item	CODcr	BOD5	NH3-N	TP
					Removal rate	>85％	>95％	>90％	>98％

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An artificial soil domestic sewage treatment system is characterized by comprising a gas absorption tower (1), a septic tank (2), an oil separation tank (3), a soil depth process tank (4) and a steam overflow well (5) which are sequentially arranged along a sewage discharge direction, wherein a submersible pump (6) is arranged at the inner bottom of the steam overflow well (5), and the output end of the submersible pump (6) is communicated with a water using pipe (7) which extends to the outer side of the steam overflow well (5) and is communicated with water using equipment;

shed covers (8) are detachably arranged on the septic tank (2) and the oil separation tank (3), the two shed covers (8) are communicated with the gas absorption tower (1) through a two-way gas pipe (9), and a paraffin absorption stage (1a) and an activated carbon absorption stage (1b) are arranged in the gas absorption tower (1);

septic tank (2) and oil interceptor (3) are linked together through bi-pass drain pipe (10) and the input of soil degree of depth technology pond (4), the output and the steam overflow well (5) input of soil degree of depth technology pond (4) are linked together through collector pipe (11), the outside intercommunication of steam overflow well (5) has drain pipe (12), soil degree of depth technology pond (4) all set up in the soil that has the lawn with steam overflow well (5).

2. The artificial soil domestic sewage treatment system according to claim 1, wherein said soil depth process tank (4) comprises a membrane (41) disposed in said soil and two water-dispersing pipes (42) disposed in parallel in said membrane (41), said two water-dispersing pipes (42) being in communication with said double air-passing pipe (9) and being externally sleeved with a nylon net (43), macadam (44) having a diameter of 20-40mm being filled between said water-dispersing pipes (42) and nylon (43) and at the bottom of said membrane (41), said soil depth process tank (4) further comprising two brackets (45) disposed in said membrane (41) and two said brackets (45) being disposed under said nylon net (43) respectively, said brackets (45) and nylon net (43) being filled with river sand (46).

3. The artificial soil domestic sewage treatment system according to claim 2 wherein said membrane (41) is of trapezoidal design with an opening at the top, said opening having a gap with the ground surface, said membrane (41) being a 0.3-0.5 mm polyvinyl fluoride membrane.

4. The artificial soil domestic sewage treatment system according to claim 1, wherein the water outlet of said septic tank (2) and said oil separation tank (3) is higher than the water inlet of said soil depth process tank (4), and the water inlet of said soil depth process tank (4) is higher than the water outlet.

5. The artificial soil domestic sewage treatment system according to claim 1, wherein said paraffin absorption stage (1a) is disposed below said activated carbon absorption stage (1b), and said gas absorption tower (1) has a vent pipe at the top.

6. The artificial soil domestic sewage treatment method according to claim 1 to 5, wherein: the method comprises the following steps:

s1: domestic sewage firstly enters a pretreatment facility such as a septic tank (2), an oil separation tank (3) and the like, and is subjected to anaerobic fermentation in the septic tank (2), so that organic matters in the sewage are decomposed, the pollutant load is reduced, the content of nutrients in the sewage is increased, and parasitic ova and pathogenic microorganisms in the sewage are killed;

s2: odor generated in the sewage pretreatment process enters a gas absorption tower (1), is filtered by a paraffin absorption stage (1a) and an active carbon absorption stage (1b) and is discharged through an exhaust pipe;

s3: the pretreated sewage automatically flows into the soil deep process pool (4) through a bi-pass drain pipe (10), is treated by the bi-pass drain pipe, then enters a steam overflow well (5) through a water collecting pipe (11) to be collected, and the treated water can be conveyed to water utilization equipment for use after the submersible pump (6) is powered on and started.