CN107244783B

CN107244783B - Rural domestic sewage's ecological treatment device based on feedwater mud

Info

Publication number: CN107244783B
Application number: CN201710588528.9A
Authority: CN
Inventors: 伍永钢; 鲁正伟; 江文亭; 夏函青; 魏东洋; 魏翔
Original assignee: Anhui Normal University
Current assignee: Anhui Normal University
Priority date: 2017-07-19
Filing date: 2017-07-19
Publication date: 2020-08-04
Anticipated expiration: 2037-07-19
Also published as: CN107244783A

Abstract

The invention discloses an ecological treatment device for rural domestic sewage, which is provided with a water inlet, wherein a grid is arranged at the water inlet, the grid is arranged in an anaerobic hydrolysis tank, a stirrer and a water level sensor are arranged in the anaerobic hydrolysis tank, the bottom end of the anaerobic hydrolysis tank is connected with a sedimentation tank, the sedimentation tank is provided with a water pump, the water pump is connected with an aeration tank, a rotary aerator is arranged in the aeration tank, the bottom end of the aeration tank is connected with a filtering tank, the bottom end of the filtering tank is directly introduced into an ecological green land, the bottom end of the sedimentation tank is connected with a sterilization chamber, and sludge at the bottom end of the sedimentation tank is sterilized by the sterilization chamber and then directly introduced into the surface soil of the ecological green land to serve as nutrients for growth of plants in the ecological green land. The ecological treatment device has the advantages of good treatment effect, simple maintenance and remarkable ecological benefit.

Description

Rural domestic sewage's ecological treatment device based on feedwater mud

Technical Field

The invention relates to the technical field of sewage recovery and treatment, in particular to an ecological treatment device for rural domestic sewage based on water supply sludge.

Background

Along with the development of industrial and agricultural production in China, the population grows, and the problem of environmental pollution is increasingly serious. At present, most domestic sewage in rural areas of China is directly discharged without any sewage collection and treatment, so that pollution to ponds and rivers is caused, the living environment of villagers is influenced, and the health of farmers is seriously threatened. The general problems existing in rural areas are as follows: the population is scattered, and is a lot, and infrastructure construction is weak, and drainage system and sewage treatment construct imperfectly. Along with the change of the agricultural life style, the improvement of the living environment requirement and the attention to the self health, the sewage discharge collection and treatment construction work in rural areas is enhanced, the infrastructure construction in new rural construction is enhanced in time, the important content of the construction work of villages and towns is promoted, and meanwhile, the method is the most urgent, urgent and outstanding problem to be solved in the current rural living environment improvement work, and has important practical significance.

The rural domestic sewage is mainly characterized in that: mainly uses waste water from rice washing, vegetable washing, shower and toilet washing; contains high human and animal excrement and urine components, and has high nitrogen and phosphorus contents, especially phosphorus contents; the water quality is stable but turbid, the color is deep and has foul smell, and the water is slightly alkaline; generally contains no toxic substances and contains a large amount of bacteria, viruses and parasitic ova. Most of rural areas in China have low financial income, low per capita income and relatively backward technical level, and the sewage treatment process suitable for treating rural domestic sewage is not very abundant. The seeking of a simple, effective and low-cost sewage treatment process is in line with the development of the era of rural domestic sewage treatment.

Disclosure of Invention

The invention aims to solve the technical problem of providing a simple, effective and low-cost ecological treatment device for rural domestic sewage.

In order to solve the problems, the technical scheme provided by the invention is as follows: an ecological treatment device of rural domestic sewage based on water supply sludge is provided with a water inlet, a grid is arranged at the water inlet, the maximum particle diameter of the grid which can pass through is 5-10 cm, the grid is arranged in an anaerobic hydrolysis tank, a stirrer and a water level sensor are arranged in the anaerobic hydrolysis tank, a feeding port is arranged at the top end of the anaerobic hydrolysis tank, a feed box is arranged at the feeding port, a quality sensor is arranged between the feed box and the feeding port, the bottom end of the anaerobic hydrolysis tank is connected with a sedimentation tank, the sedimentation tank is provided with a water suction pump, a telescopic water suction pipe is arranged at the bottom end of the water suction pump, the water suction pump is connected with an aeration tank, a rotary aerator is arranged in the aeration tank, and the rotary aerator is composed of a main aeration pipe and 6 branch aeration pipes, the aeration machine is characterized in that a main aeration pipe and a branch aeration pipe rotate together in the working process of the rotary aeration machine, the aeration efficiency can be improved, aeration holes are formed in the branch aeration pipe, the bottom end of the aeration tank is connected with a filter tank, the filter tank is provided with 3 layers of filter materials, a water supply sludge composite filler layer, an activated alumina carrier filler layer and a modified bentonite filler layer are sequentially arranged on the filter tank, the bottom end of the filter tank is directly led into an ecological green land, the bottom end of a sedimentation tank is connected with a sterilization chamber, and sludge at the bottom end of the sedimentation tank is directly led into the surface soil of the ecological green land after being sterilized in the sterilization chamber and serves as nutrients for growth of plants in the ecological green land.

Furthermore, the stirrer is composed of a round wheel, stirring fan blades are arranged on the periphery of the stirrer, the water level sensor is arranged on the stirring fan blades, the water level sensor can monitor the sewage content in the aeration tank in time, and the amount of the mixture in the material box to be added is determined through the quality sensor.

Further, a mixture formed by mixing anaerobic bacteria or facultative bacteria and the nanoscale superfine flocculant according to the mass ratio of 1:5 is filled in the material box, and the mass ratio of the mixture to sewage is 1: 100.

Further, the nano-scale ultrafine powder flocculant is formed by adding 2-3 times of polyacrylamide gel into equal amounts of nano-scale activated carbon powder, nano-scale diatomite, activated clay, nano-scale poly dimethyl diallyl ammonium chloride, aluminum sulfate and ferric chloride after mixing.

Furthermore, the volumes of 3 layers of filter materials of the feed water sludge composite filler layer, the activated alumina carrier filler layer and the modified bentonite filler layer which are arranged in the filter tank sequentially account for 40%, 20% and 10% of the volume of the filter tank.

Further, the preparation method of the water supply sludge composite filler filled in the water supply sludge composite filler layer comprises the following steps: after mixing the dried and granulated water supply sludge, asbestos fiber and calcium carbonate according to the mass ratio of 5:2:1, dissolving the mixture in a hot starch aqueous solution according to the solid-to-liquid ratio of 2:5, keeping the mixture for 2-3 hours to form a mixed solution, then adding ionic polymer adsorption resin with the mass being 3-4 times of that of the mixed solution and polyacrylamide with the mass being 0.2-0.3 time of that of the mixed solution into the mixed solution, stirring for 10-20 minutes, treating the filler in an ultrasonic disperser for 1-2 hours, and drying to obtain the water supply sludge composite filler.

Further, the preparation method of the active alumina carrier filler filled in the active alumina carrier filler layer (19) comprises the following steps: sintering the alumina at 1300 ℃ for 3-4 h, heating at a speed of 100 ℃/h, and continuing sintering until the temperature rises to 2000 ℃.

Furthermore, the gravels with the particle size of less than 2cm and loose red loam are filled under the ecological green land surface soil, and the gravels and the loose red loam are mixed according to the mass ratio of 2: 3.

Further, the use method of the ecological treatment device for rural domestic sewage comprises the following steps: domestic sewage enters the device through the water inlet, large-particle impurities can be filtered by a grid arranged at the water inlet while the domestic sewage enters the device, the filtered sewage enters the anaerobic hydrolysis tank, substances in a material box can be proportionally fed into the sewage through a mass sensor while the sewage enters the anaerobic hydrolysis tank, a stirrer and a water level sensor work simultaneously, the water inlet and the feeding are stopped when the sewage reaches a certain height, then the sewage is continuously stirred and fermented for 3-4 hours, the sewage is introduced into the sedimentation tank to be precipitated for 1-2 hours, a water suction pump arranged in the sedimentation tank pumps supernatant liquid into an aeration tank, an aerator is rotated to start working simultaneously, the sewage directly enters the filtration tank after being subjected to aeration treatment for 0.5-1 hour, and the sewage sequentially passes through the water supply sludge composite packing layer, the activated alumina carrier packing layer and the modified bentonite packing layer, the filtered sewage is directly introduced into the ecological green land as a water source for plant growth, and meanwhile, the precipitate in the sedimentation tank is sterilized in a sterilization chamber and then is directly introduced into the surface soil of the ecological green land as a fertilizer required by plant growth.

Compared with the prior art, the invention has the beneficial effects that: the ecological treatment device of the invention adopts the steps of adding anaerobic bacteria or facultative bacteria, nano-scale superfine powder adsorbent and flocculating agent in proportion while carrying out anaerobic treatment, and simultaneously continuously stirring, thereby reducing the treatment steps, accelerating the treatment efficiency, not only effectively filtering large-particle substances in sewage, but also having the effects of denitrification and dephosphorization after aeration treatment and filtration treatment, directly introducing the treated sewage into the ecological green land as the water source of the ecological green land, and introducing the sludge settled in the sewage into the surface soil of the ecological green land after sterilization treatment to be used as the nutrient source of plants. The ecological treatment device can effectively utilize domestic sewage, reduces environmental pollution caused by direct discharge of the domestic sewage, has good treatment effect, can be recycled in situ, has low investment, low system operation cost, simple maintenance and remarkable ecological benefit, and has good economic value.

Drawings

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

Wherein: 1-water inlet, 2-grid, 3-anaerobic hydrolysis tank, 4-stirrer, 5-water level sensor, 6-feeding port, 7-feed box, 8-mass sensor, 9-sedimentation tank, 10-water pump, 11-telescopic water pumping pipe, 12-aeration tank, 13-rotary aerator, 14-main aeration pipe, 15-branch aeration pipe, 16-aeration hole, 17-filtering tank, 18-water sludge composite packing layer, 19-activated alumina carrier packing layer, 20-modified bentonite packing layer, 21-ecological greenbelt and 22-sterilization chamber.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings 1 and examples:

as shown in figure 1, the ecological treatment device for rural domestic sewage based on water supply sludge is provided with a water inlet 1, a grid 2 is arranged at the water inlet 1, the maximum particle size which can pass through the grid 2 is 5-10 cm, the grid 2 is arranged in an anaerobic hydrolysis tank 3, a stirrer 4 and a water level sensor 5 are arranged in the anaerobic hydrolysis tank 3, the stirrer 4 is composed of a round wheel, stirring blades are arranged on the periphery of the stirrer 4, the water level sensor 5 is arranged on the stirring blades, the water level sensor 5 can timely monitor the sewage content in an aeration tank, the amount of a mixture in a material box needing to be added is determined through a quality sensor 8, a feeding port 6 is arranged at the top end of the anaerobic hydrolysis tank 3, a material box 7 is arranged at the feeding port 6, the material box 7 is filled with a mixture formed by mixing anaerobic bacteria or facultative bacteria and a nano-level ultrafine flocculant according to a mass ratio of 1:5, the mass ratio of the mixture to the sewage is 1:100, the nanoscale ultrafine flocculant is nanoscale activated carbon powder, nanoscale diatomite, activated clay, nanoscale poly dimethyl diallyl ammonium chloride, aluminum sulfate and ferric chloride are equivalently mixed and then added into 2-3 times of polyacrylamide gel relative to the mixture to form the nanoscale ultrafine flocculant, a mass sensor 8 is arranged between a material box 7 and a feeding port 6, the bottom end of an anaerobic hydrolysis tank 3 is connected with a sedimentation tank 9, the sedimentation tank 9 is provided with a water pump 10, the bottom end of the water pump 10 is provided with a telescopic water pumping pipe 11, the water pump 10 is connected with an aeration tank 12, a rotary aerator 13 is arranged in the aeration tank 12, the rotary aerator 13 is composed of a

main aeration pipe

14 and 6 branch aeration pipes 15, the main aeration pipe 14 and the branch aeration pipes 15 rotate together in the working process of the rotary aerator, can improve the efficiency of aeration, be provided with the aeration hole 16 on the aeration pipe 15, the bottom and the filtering ponds 17 of aeration tank 12 are connected, filtering ponds 17 are provided with 3 layers of filter material, be feedwater mud composite packing layer 18 in proper order, active alumina carrier packing layer 19, modified bentonite packing layer 20, the feedwater mud composite packing layer 18 that filtering ponds 17 set up, active alumina carrier packing layer 19, the volume of modified bentonite packing layer 203 layer filter material account for 40%, 20%, 10% of filtering ponds 17 volume in proper order, the preparation method of the feedwater mud composite packing that feedwater mud composite packing layer 18 was filled is: after mixing the dried and granulated water supply sludge, asbestos fiber and calcium carbonate according to the mass ratio of 5:2:1, dissolving the mixture in a hot starch water solution according to the solid-to-liquid ratio of 2:5, keeping the mixture for 2-3 hours to form a mixed solution, then adding ionic polymer adsorption resin with the mass being 3-4 times of that of the mixed solution and polyacrylamide with the mass being 0.2-0.3 time of that of the mixed solution into the mixed solution, stirring for 10-20 minutes, treating the filler in an ultrasonic disperser for 1-2 hours, and drying to obtain the water supply sludge composite filler, wherein the preparation method of the activated alumina carrier filler filled in the activated alumina carrier filler layer (19) comprises the following steps: sintering aluminum oxide at 1300 ℃ for 3-4 h at low temperature, heating at the speed of 100 ℃/h, continuously sintering until the temperature rises to 2000 ℃, directly introducing the bottom end of the filter tank 17 into the ecological green land 21, connecting the bottom end of the sedimentation tank 9 with the sterilization chamber 22, sterilizing the sludge at the bottom end of the sedimentation tank 9 in the sterilization chamber 22, and directly introducing the sludge into the surface soil of the ecological green land 21, wherein the crushed stone and loose red loam with the particle size of less than 2cm are filled in the surface soil of the ecological green land 21, and the crushed stone and loose red loam are mixed according to the mass ratio of 2: 3.

The use method of the ecological treatment device for rural domestic sewage comprises the following steps: domestic sewage enters the device through the water inlet 1, the grid 2 arranged at the water inlet 1 can filter large-particle impurities while entering the device, the filtered sewage enters the anaerobic hydrolysis tank 3, the material in the material box 7 can be put into the sewage in proportion through the mass sensor 8 by the feeding port 6 arranged at the top end of the anaerobic hydrolysis tank 3 while the sewage enters the anaerobic hydrolysis tank 3, the stirrer 4 and the water level sensor 5 work simultaneously, the water feeding and the material feeding are stopped when the water level reaches a certain height, then the sewage is continuously stirred and fermented for 3-4 hours, is introduced into the sedimentation tank 9 for sedimentation for 1-2 hours, then the water pump 10 arranged in the sedimentation tank 9 pumps upper clear liquid into the aeration tank 12, the aerator 13 is rotated to start working, the sewage directly enters the filter tank 17 after the aeration treatment for 0.5-1 hour, and sequentially passes through the feed water sludge composite 18, The active alumina carrier filler layer 19 and the modified bentonite filler layer 20, the filtered sewage is directly introduced into the ecological green land 21 as the water source for plant growth, and the precipitate in the sedimentation tank 9 is sterilized by the sterilization chamber 22 and then is directly introduced into the surface soil of the ecological green land 21 as the fertilizer required by plant growth

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The ecological treatment device for rural domestic sewage based on water supply sludge is characterized in that the ecological treatment device is provided with a water inlet (1), a grid (2) is arranged at the position of the water inlet (1), the maximum particle size of the grid (2) which can pass through is 5-10 cm, the grid (2) is arranged in an anaerobic hydrolysis tank (3), a stirrer (4) and a water level sensor (5) are arranged in the anaerobic hydrolysis tank (3), a feeding port (6) is arranged at the top end of the anaerobic hydrolysis tank (3), a feed box (7) is arranged at the feeding port (6), a quality sensor (8) is arranged between the feed box (7) and the feeding port (6), the bottom end of the anaerobic hydrolysis tank (3) is connected with a sedimentation tank (9), a water suction pump (10) is arranged at the sedimentation tank (9), and a telescopic water suction pipe (11) is arranged at the bottom end of the water suction pump (10), the water pump (10) is connected with an aeration tank (12), a rotary aerator (13) is arranged in the aeration tank (12), the rotary aerator (13) consists of a main aerator pipe (14) and 6 branch aerator pipes (15), the branch aeration pipe (15) is provided with aeration holes (16), the bottom end of the aeration tank (12) is connected with a filter tank (17), the filter tank (17) is provided with 3 layers of filter materials, namely a feed water sludge composite filler layer (18), an activated alumina carrier filler layer (19) and a modified bentonite filler layer (20) in sequence, the bottom end of the filter tank (17) is directly introduced into the ecological green land (21), the bottom end of the sedimentation tank (9) is connected with the sterilization chamber (22), and the sludge at the lower end of the sedimentation tank (9) is sterilized in the sterilization chamber (22) and then is directly introduced into the surface soil of the ecological green land (21);

the stirrer (4) is composed of a round wheel, stirring blades are arranged on the periphery of the stirrer, and the water level sensor (5) is arranged on the stirring blades;

the feed box (7) is filled with a mixture formed by mixing anaerobic bacteria or facultative bacteria and a nano-scale superfine flocculant according to the mass ratio of 1:5, and the mass ratio of the mixture to sewage is 1: 100;

the volume of 3 filter materials of a feed water sludge composite filler layer (18), an activated alumina carrier filler layer (19) and a modified bentonite filler layer (20) arranged in the filter tank (17) sequentially accounts for 40%, 20% and 10% of the volume of the filter tank (17);

the preparation method of the water supply sludge composite filler filled in the water supply sludge composite filler layer (18) comprises the following steps: after mixing the dried and granulated water supply sludge, asbestos fibers and calcium carbonate according to the mass ratio of 5:2:1, dissolving the mixture in a hot starch aqueous solution according to the solid-to-liquid ratio of 2:5, keeping the mixture for 2-3 hours to form a mixed solution, then adding ionic polymer adsorption resin with the mass being 3-4 times that of the mixed solution and polyacrylamide with the mass being 0.2-0.3 time that of the mixed solution into the mixed solution, stirring for 10-20 minutes, treating the filler in an ultrasonic disperser for 1-2 hours, and drying to obtain the water supply sludge composite filler;

the preparation method of the active alumina carrier filler filled in the active alumina carrier filler layer (19) comprises the following steps: sintering the alumina at 1300 ℃ for 3-4 h at a low temperature, heating at a speed of 100 ℃/h, and continuing sintering until the temperature rises to 2000 ℃;

the ecological green land (21) is filled with gravels with the grain diameter less than 2cm and loose red loam under the surface soil, and the gravels and the loose red loam are mixed according to the mass ratio of 2: 3.

2. The ecological treatment device for rural domestic sewage based on feedwater sludge of claim 1, wherein the use method of the ecological treatment device for rural domestic sewage is as follows: domestic sewage enters the device through the water inlet (1), large-particle impurities can be filtered by the grid (2) arranged at the water inlet (1) during entering, the filtered sewage enters the anaerobic hydrolysis tank (3), a material in a material box (7) can be put into the sewage in proportion through a mass sensor (8) by a feeding port (6) arranged at the top end of the anaerobic hydrolysis tank (3) while the sewage enters the anaerobic hydrolysis tank (3), meanwhile, a stirrer (4) and a water level sensor (5) work, when the water level reaches a certain height, water feeding and feeding are stopped, then, fermentation treatment is continuously stirred for 3-4 hours, the sewage is introduced into the sedimentation tank (9) to precipitate for 1-2 hours, a water pump (10) arranged in the sedimentation tank (9) pumps supernatant liquid into an aeration tank (12), simultaneously, an aerator (13) is rotated to start working, the sewage directly enters a filtering tank (17) after 0.5-1 hour of aeration treatment, the sewage is filtered and directly introduced into an ecological green land (21) to serve as a water source for plant growth, and meanwhile, precipitates in a sedimentation tank (9) are sterilized by a sterilization chamber (22) and then directly introduced into the lower surface of surface soil of the ecological green land (21) to serve as fertilizer required by plant growth.