CN211999350U

CN211999350U - Dirty utilization system of scale plant excrement

Info

Publication number: CN211999350U
Application number: CN202020261875.8U
Authority: CN
Inventors: 林国宁; 赖日坤; 张建华
Original assignee: Guangdong Shuiqing Environmental Protection Technology Co ltd
Current assignee: Guangdong Shuiqing Environmental Protection Technology Co ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-11-24
Anticipated expiration: 2030-03-05

Abstract

A large-scale farm excrement resource utilization system, after the excrement of the farm is removed a large amount of solid matters such as suspended matters and dry excrement through a grating pool and a solid-liquid separator, sewage enters an anaerobic fermentation tank for anaerobic fermentation, and the separated solid matters are dewatered by a centrifugal dehydrator and then subjected to compost treatment; and the sewage enters a tubular microfiltration membrane, a two-stage RO device and a DTRO device to further remove substances such as COD (chemical oxygen demand), SS (suspended substances) and the like in the wastewater, a concentrated solution is prepared into a liquid fertilizer, and clear water is disinfected and then reused as water for flushing fences in a plant area. The invention solves a series of defects caused by unreasonable treatment of the feces in the farm and the problem of pollution to the environment, realizes zero discharge of the feces and realizes the recycling of resources.

Description

Dirty utilization system of scale plant excrement

Technical Field

The invention relates to the technical field of fecal sewage treatment, in particular to a method and a system for recycling fecal sewage in a large-scale farm.

Background

The livestock and poultry breeding industry in China shows the gradient development of scattered households, special households and large scale, according to the statistical yearbook of 2016 years in China, the annual bottom breeding amount of 2015 years of China for large livestock is 12195.7 ten thousand, wherein the breeding amount of cattle is 10817.3 ten thousand, and accounts for 88.7%; the slaughtering amount of live pigs in the year reaches 70825 ten thousand, the slaughtering amount in the end of the year reaches 45112.5 ten thousand, and the egg yield reaches 2999.2 ten thousand tons. But the environmental pollution problem brought by the large-scale development is more and more prominent day by day, and the first national pollution source census bulletin result shows that the large-scale livestock and poultry breeding excrement generates 2.43 hundred million tons, the urine generates 1.63 million tons, and the livestock and poultry excrement pollution is the first pollution of agricultural sources.

At present, the livestock and poultry breeding manure is restricted by low breeding profit and high risk by adopting industrialized treatment, and is difficult to stably and normally operate; the unreasonable discharge of the livestock and poultry breeding excrement causes environmental pollution, but the excrement is a resource when being used as agricultural planting fertilizer. China is a large breeding country and a large planting country, but due to planting and breeding separation, resource utilization of breeding excrement is hindered, on one hand, the environment is polluted by a large amount of discharged excrement, on the other hand, soil organic matters are reduced due to the fact that a large amount of chemical fertilizers are applied in agricultural planting, and agricultural non-point source pollution is aggravated. The livestock and poultry manure is an important source for providing soil organic matters, and the livestock and poultry manure can effectively solve the problem of breeding pollution, improve the content of the soil organic matters and reduce the loss of planting nitrogen and phosphorus. Therefore, the invention is important for the large-scale livestock farm excrement resource utilization system.

Disclosure of Invention

The invention aims to provide a large-scale livestock farm excrement resource utilization system, which solves a series of defects caused by unreasonable treatment of the livestock farm excrement and solves the problem of environmental pollution.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a large-scale farm feces resource utilization system comprises a grating machine, a water collecting tank, a solid-liquid separator, an adjusting tank, an anaerobic fermentation tank, a biogas residue tank, a biogas liquid tank, a centrifugal dehydrator, a tubular microfiltration membrane, a first water production tank, a first-stage RO device, a first-stage concentration tank, a second-stage RO device, a second-stage concentration tank, a DTRO device, a third-stage concentration tank, a blending tank, a second water production tank, a water purification RO device, a water purifying tank and a disinfection tank, wherein one outlet of the grating machine is connected to the water collecting tank, and the other outlet of the grating machine is connected to the biogas residue tank; an outlet of the water collecting tank is connected to a solid-liquid separator through a pump, one outlet of the solid-liquid separator is connected to the regulating tank, and the other outlet of the solid-liquid separator is connected to the biogas residue tank; the adjusting tank is connected to an anaerobic fermentation tank through a pump, one outlet of the anaerobic fermentation tank is connected to the biogas residue pool, and the other outlet of the anaerobic fermentation tank is connected to the biogas liquid pool; an outlet of the biogas slurry pool is connected to a biogas residue pool, an outlet of the biogas residue pool is connected to the centrifugal dehydrator, and the other outlet of the biogas slurry pool is connected to the tubular microfiltration membrane through a pump; one outlet of the tubular microfiltration membrane is connected to the biogas slurry pool through a pump, and the other outlet of the tubular microfiltration membrane is connected to the first water production pool;

the first water producing pond is connected with the first-stage RO device through a pump; one outlet of the first-stage RO device is connected to the second water producing tank through a pump, and the other outlet of the first-stage RO device is connected to the first-stage concentration tank; the first-stage concentration tank is connected to a second-stage RO device, one outlet of the second-stage RO device is connected to the second water producing tank through a pump, and the other outlet of the second-stage RO device is connected to the second-stage concentration tank; the second-stage concentration tank is connected to the DTRO device through a pump, one outlet of the DTRO device is connected to the second water production tank through a pump, and the other outlet of the DTRO device is connected to the third-stage concentration tank; the third-stage concentration tank is connected to the blending tank;

the second water producing pool is connected to a water purifying RO device through a pump, one outlet of the water purifying RO device is connected to the first water producing pool, and the other outlet of the water purifying RO device is connected to the water inlet pool; the clean water tank is connected to the disinfection tank.

Furthermore, the anaerobic fermentation tank adopts a USR anaerobic process, adopts a water distributor to distribute water in a tube type, and is also provided with an anaerobic sewage circulating device.

Further, in order to more effectively intercept suspended particles, colloids, organic macromolecules, bacteria and microorganisms in the sewage, the pore diameter of the tubular microfiltration membrane is 0.1 um.

The method and the system provided by the invention can realize the purposes of pollution-free and zero emission in the treatment of the livestock and poultry waste, and have a complete treatment and recycling system for all pollutants in the waste, thereby realizing the resource utilization of material energy and reducing the pollution to the environment. After the manure is treated by the process, pollutants are respectively converted into liquid fertilizer, solid fertilizer and clear water which respectively enter a farmland and a plant area recycling system, namely the generated clear water is used for washing pigsties of the plant area, and the liquid fertilizer and the solid fertilizer are applied to irrigation treatment of farmland crops, vegetables, fruit trees, forest trees and the like. In the process, the livestock and poultry pollutants are converted into available resources and energy sources, so that the effective treatment concept of resource utilization of agricultural wastes of local consumption, energy circulation and comprehensive utilization is realized, and the method has high economic and environmental protection values.

Drawings

FIG. 1 is a schematic flow chart of a large-scale farm manure resource utilization system of the present invention.

Detailed Description

The system of the present invention will be described in more detail below with reference to the accompanying drawings and examples.

As shown in figure 1, a system for recycling excrement and sewage in a large-scale farm,

a large-scale farm feces resource utilization system comprises a grating machine, a water collecting tank, a solid-liquid separator, an adjusting tank, an anaerobic fermentation tank, a biogas residue tank, a biogas liquid tank, a centrifugal dehydrator, a tubular microfiltration membrane, a first water production tank, a first-stage RO device, a first-stage concentration tank, a second-stage RO device, a second-stage concentration tank, a DTRO device, a third-stage concentration tank, a blending tank, a second water production tank, a water purification RO device, a water purifying tank and a disinfection tank, wherein one outlet of the grating machine is connected to the water collecting tank, and the other outlet of the grating machine is connected to the biogas residue tank; an outlet of the water collecting tank is connected to a solid-liquid separator through a pump, one outlet of the solid-liquid separator is connected to the regulating tank, and the other outlet of the solid-liquid separator is connected to the biogas residue tank;

the adjusting tank is connected to an anaerobic fermentation tank through a pump, one outlet of the anaerobic fermentation tank is connected to the biogas residue pool, and the other outlet of the anaerobic fermentation tank is connected to the biogas liquid pool; the anaerobic fermentation tank adopts a USR anaerobic process, adopts a water distributor to distribute water in a pipe type, and is also provided with an anaerobic sewage circulating device.

An outlet of the biogas slurry pool is connected to a biogas residue pool, an outlet of the biogas residue pool is connected to the centrifugal dehydrator, and the other outlet of the biogas slurry pool is connected to the tubular microfiltration membrane through a pump; in order to more effectively retain suspended particles, colloid, organic macromolecules, bacteria and microorganisms in the sewage, the pore diameter of the tubular microfiltration membrane is 0.1 um. One outlet of the tubular microfiltration membrane is connected to the biogas slurry pool through a pump, and the other outlet of the tubular microfiltration membrane is connected to the first water production pool;

Conveying collected excrement to a grid pond to remove impurities, enabling effluent to flow into a water collecting pond to be collected, pumping the effluent into a solid-liquid separator to perform solid-liquid separation, and conveying the separated liquid to an adjusting pond to stay for 8-12 hours in order to better uniform water quality and quantity;

and pumping the effluent of the regulating reservoir into an anaerobic fermentation tank, and carrying out anaerobic digestion in an environment with the optimal temperature of 30-35 ℃ and the hydraulic retention time of 5 days. The anaerobic fermentation tank adopts a USR (upflow solid anaerobic reactor) anaerobic process, the water distribution adopts a water distributor for tube-divided water distribution, an anaerobic sewage circulating device is arranged, and the upward flow velocity in the tank body is kept at 0.5-1.0 m/s. After the anaerobic digestion is finished, the digestive juice flows into a biogas liquid pool to carry out solid-liquid separation to a certain degree;

in the implementation steps, simultaneously, the grid slag intercepted by the grid pond, the dry manure separated by the solid-liquid separator, the sludge produced by the anaerobic fermentation tank and the biogas slag produced by the biogas slurry pond are collected in the biogas slag pond and enter the centrifugal dehydrator for dehydration treatment, the centrifugal dehydrator can centrifuge suspension liquid containing solid phase substances with the particle size of more than 0.005mm and the concentration range of 2-40%, and the suspension liquid can be continuously fed, separated, washed and unloaded under full-speed operation, so that the centrifugal dehydrator has the characteristics of compact structure, continuous operation, stable operation, strong adaptability, large production capacity, convenient maintenance and the like. Then composting the separated solid substance to prepare a solid organic fertilizer which can be used for irrigating crops, vegetables, fruit trees, woods and the like; the separated pressure filtrate enters the front end of the grating tank for secondary treatment.

And pumping the effluent of the biogas slurry pool into a tubular microfiltration membrane, wherein the tubular microfiltration membrane is a porous membrane made of an ultra-high molecular polymer, the aperture of the porous membrane is 0.1um, and the effluent is driven to flow down through the membrane under the pressure of 0.1-1.8 kg/cm2 by combining a micro-flocculation technology, so that suspended particles, colloids, organic macromolecules, bacteria, microorganisms and the like in the raw water can be separated. Pumping the concentrated solution generated by the tubular microfiltration membrane back to the biogas slurry pool for circulating filtration at a reflux ratio of 400%, and pumping the filtered produced water into the first water producing pool.

Then pumping the effluent of the first water producing tank into a first-stage RO device through a high pressure pump with the lift range of 1.5-2.0 MPa,the concentrated solution flows into a first-stage concentration tank; pumping the effluent of the concentration tank into a secondary RO device, and enabling the concentrated solution to enter a secondary concentration tank; and pumping the effluent of the second-stage concentration tank into a DTRO (disc tube reverse osmosis membrane) device, and enabling the concentrated solution to enter a third-stage concentration tank. The first-stage RO device and the second-stage RO device are both provided with anti-pollution membranes (such as the Dow FILTEC)^TMAnti-pollution membrane), the DTRO membrane is arranged in the DTRO membrane device, the surface of the DTRO membrane is smooth, and the DTRO membrane has a wider fluid channel, is not easy to block and can bear high-concentration organic load. The concentrated solution of 5 times of the stock solution can be obtained by the effluent of the first-level RO device, the effluent concentrated solution of the second-level RO device can be concentrated by 3.3 times on the basis of the concentrated solution of the first-level RO, and the concentrated solution of the second-level RO device can be concentrated by 2 times by the DTRO device. And (3) enabling effluent to enter a blending tank, adding auxiliary materials or microbial inoculum, metering and packaging, and preparing a liquid fertilizer product by using a liquid fertilizer production device.

The produced water collected in the first-stage RO device, the second-stage RO device and the DTRO device (the disc tube type reverse osmosis device) is pumped into a second water producing tank and is pumped into a water purifying RO device through a high-pressure pump, and the produced water enters a water purifying tank and then enters a disinfection tank for reuse and flushing the fence after disinfection. The pollutants flushed from the colony house can be returned to the grating machine for treatment; and meanwhile, the concentrated solution collected by the water purifying RO device flows back to the first water producing pool for circular treatment again.

The method and the system for recycling excrement and sewage in a large-scale farm are described in an exemplary manner with reference to the attached drawings, and obviously, the specific implementation of the method and the system is not limited by the manner, and the method and the system are within the protection scope of the invention as long as various improvements are carried out by adopting the method conception and the technical scheme of the invention or the method and the system are directly applied to other occasions without improvement.

Claims

1. A large-scale farm excrement resource utilization system is characterized by comprising a grating machine, a water collecting tank, a solid-liquid separator, an adjusting tank, an anaerobic fermentation tank, a biogas residue tank, a biogas liquid tank, a centrifugal dehydrator, a tubular microfiltration membrane, a first water production tank, a first RO (reverse osmosis) device, a first concentration tank, a second RO device, a second concentration tank, a DTRO device, a third concentration tank, a blending tank, a second water production tank, a water purification RO device, a water purification tank and a disinfection tank, wherein one outlet of the grating machine is connected to the water collecting tank, and the other outlet of the grating machine is connected to the biogas residue tank; an outlet of the water collecting tank is connected to a solid-liquid separator through a pump, one outlet of the solid-liquid separator is connected to the regulating tank, and the other outlet of the solid-liquid separator is connected to the biogas residue tank; the adjusting tank is connected to an anaerobic fermentation tank through a pump, one outlet of the anaerobic fermentation tank is connected to the biogas residue pool, and the other outlet of the anaerobic fermentation tank is connected to the biogas liquid pool; an outlet of the biogas slurry pool is connected to a biogas residue pool, an outlet of the biogas residue pool is connected to the centrifugal dehydrator, and the other outlet of the biogas slurry pool is connected to the tubular microfiltration membrane through a pump; one outlet of the tubular microfiltration membrane is connected to the biogas slurry pool through a pump, and the other outlet of the tubular microfiltration membrane is connected to the first water production pool;

2. The system of claim 1, wherein the anaerobic fermentation tank adopts a USR anaerobic process, adopts a water distributor to distribute water in a tube type, and is provided with an anaerobic sewage circulating device.

3. The system of claim 1, wherein the pore size of the tubular microfiltration membrane is 0.1 um.