CN106986470A - A kind of livestock and poultry cultivation sewage disposal zero-emission and organic fertilizer recovery system and its technique - Google Patents

Abstract

The invention discloses a livestock and poultry breeding sewage treatment zero discharge and organic fertilizer recovery system and its treatment process, including: a solid-liquid separation system for preliminary separation of solid and liquid in sewage, and a solid-liquid separation system for removing larger particle impurities The pre-filtration system, the tubular ultrafiltration membrane system for further removing smaller particles, and the multi-stage RO system for multi-stage filtration and concentration. After the aquaculture sewage passes through the above systems in turn, it meets the national sewage discharge standards. Fresh water and liquid organic fertilizer that can be used as fertilizer. After the livestock and poultry breeding sewage is treated by the above-mentioned technical scheme, the water quality of the obtained clear water can not only meet the sewage discharge standard and the reclaimed water reuse standard, but also obtain solid and liquid organic fertilizers, which avoids pollution to the environment and improves the The utilization rate of sewage can realize the automatic operation of the whole system and the automatic cleaning of each system, which reduces the labor cost and the treatment process is simple.

Description

A zero-discharge and organic fertilizer recovery system and process for livestock and poultry breeding sewage treatment

technical field

The invention relates to the field of sewage treatment, in particular to a livestock and poultry breeding sewage treatment zero discharge and organic fertilizer recovery system and a treatment process thereof.

Background technique

Some existing livestock and poultry farms discharge a large amount of feces and urine sewage every day, and if the discharged sewage treatment is not up to standard or discharged directly without treatment, that is, COD, suspended solids, ammonia nitrogen, and total phosphorus in the discharged sewage Such pollutants seriously exceed the standard, which will cause serious pollution to the surrounding environment. In addition, the discharged sewage also contains some available nutrients, such as organic fertilizers, etc. If it is directly discharged or not recycled, it will pollute the environment and cause some organic fertilizer losses, and the sewage cannot be fully recovered. use. Therefore, it is necessary to have a system and process for treating and recycling sewage to avoid polluting the environment.

Contents of the invention

In view of the above technical problems, the purpose of the present invention is to provide a zero-discharge and organic fertilizer recovery system for livestock and poultry breeding sewage. After the sewage is treated by this system, the water quality can meet the sewage discharge standard and the reclaimed water reuse standard. Solid and liquid organic fertilizers can also be obtained, which avoids environmental pollution and improves the utilization rate of sewage.

In order to achieve the above purpose, the technical solution provided by the present invention is as follows: a system for zero discharge of livestock and poultry breeding sewage treatment and organic fertilizer recovery, comprising:

A solid-liquid separation system, the solid-liquid separation system is provided with a sewage collection tank, and after the solid and liquid in the sewage are initially separated, the obtained filtrate is collected in the sewage collection tank;

A pre-filter system, the pre-filter system includes a pre-filter and a first collection tank, the pre-filter pre-filters the sewage in the sewage collection tank, and after removing larger particles of debris, the filtered sewage is stored in the first a collection bucket;

Tubular ultrafiltration membrane system, the tubular ultrafiltration membrane includes a tubular ultrafiltration membrane and a second collection bucket, the tubular ultrafiltration membrane removes impurities with a particle size greater than 10 μm in the sewage in the first collection bucket, and the ultrafiltration The final sewage is collected in the second collection bucket;

A multi-stage RO system, the multi-stage RO system includes a multi-stage RO, a plurality of collection buckets and a clear water bucket, the multi-stage RO performs multi-stage filtration and concentration on the sewage in the second collection bucket, and the resulting filtered water Store in clear water buckets, and dehydrate the final concentrate to make liquid organic fertilizer.

Further, the multi-stage RO system includes a primary RO system, a secondary RO system, a DTRO system, a third collection bucket, a fourth collection bucket, a fifth collection bucket, and a clean water bucket. The water inlet of the primary RO system Connect with the water outlet of the second collection bucket, collect the filtered water obtained after filtering in the third collection bucket, and collect the obtained concentrate in the fourth collection bucket; the water outlet of the third collection bucket is connected with the secondary The water inlet of the RO system is connected, and the filtered water is collected in a clean water bucket; the water outlet of the fourth collection bucket is connected to the water inlet of the DTRO system, and the concentrated solution concentrated by the DTRO system is collected in the fifth collection. barrel, dehydrated and concentrated to make liquid organic fertilizer.

Further, after the secondary RO system filters and concentrates the filtered water in the third collection bucket, the concentrated solution is returned to the second collection bucket for circulating filtration and concentration.

Further, the DTRO system returns the filtered water obtained when processing the concentrated liquid in the fourth collection bucket to the third collection bucket, and is filtered and concentrated again through the secondary RO system.

Further, the recovery system also includes a control system, through which the automatic operation of the solid-liquid separation system, the pre-filtration system, the tubular ultrafiltration membrane system and the multi-stage RO system is controlled.

Further, each of the sewage collection tank and/or the first collection bucket and/or the second collection bucket and/or the third collection bucket and/or the fourth collection bucket is provided with a lift pump, through which the sewage, The filtered water or concentrated liquid is pumped to the water inlet of the corresponding next-level system.

Further, a liquid level controller is also provided in the sewage collection tank and/or the first collection bucket and/or the second collection bucket and/or the third collection bucket and/or the fourth collection bucket, and the liquid level controller The liquid level controller is a liquid level float, and the liquid level controller automatically controls the opening and closing of each lifting pump by monitoring the actual water level in the sewage collection tank and each collection bucket.

Further, a filter screen is provided in the pre-filter, and the aperture of the filter screen is 0.5-0.8 mm.

Further, a return pipe is provided between the clear water bucket and the tubular ultrafiltration membrane system, primary RO system, secondary RO system and DTRO system. When each system stops running and the sewage is emptied, the water in the clean water bucket Filtered water will return to each system through the corresponding return pipe and clean it.

Furthermore, after being sterilized by ultraviolet rays, the filtered water in the clear water bucket can be used for washing livestock pens, grounds, roads, vehicles, construction, urban greening, fire protection, etc.

Another object of the present invention is to provide a treatment process for zero discharge of livestock and poultry breeding sewage and organic fertilizer recovery, which adopts the above technical solution to treat livestock and poultry breeding sewage.

By adopting the above-mentioned technical means, the present invention has the following beneficial effects: the sewage is treated by combining methods such as prefiltration, ultrafiltration, reverse osmosis and membrane concentration, and the water quality can reach the sewage discharge standard (refer to "Livestock and Poultry Breeding Pollutants") Discharge Standard" (GB/T 18596-2001)), it can also meet the water reuse standards for flushing livestock pens, grounds, roads, vehicles, urban greening, building construction, fire protection, etc. (some water quality standards refer to "Urban Sewage Recycling Utilize the Water Quality of Urban Miscellaneous Water (GB/T18920-2002)) to obtain solid and liquid organic fertilizers at the same time, avoiding pollution to the environment, and improving the utilization rate of sewage, and can realize the automatic operation and treatment of the whole system Each system is automatically cleaned, which reduces labor costs and the processing process is simple.

Description of drawings

Fig. 1 is a schematic flow chart of the present invention.

detailed description

The present invention will be further described below in conjunction with specific embodiments.

As shown in Figure 1, a livestock and poultry breeding sewage treatment zero discharge and organic fertilizer recovery system includes the following systems: a solid-liquid separation system for the preliminary separation of solids and liquids in sewage, a system for removing larger particles Pre-filtration system for impurities, tubular ultrafiltration membrane system for further removal of smaller particle impurities and multi-stage RO system for multi-stage filtration and concentration.

After solid-liquid separation to obtain solid organic fertilizer and biogas tank pretreatment, the excrement and urine sewage from livestock and poultry breeding is collected in the sewage collection tank. In addition to collecting sewage, the sewage collection tank also has the functions of regulating and stabilizing water volume, Balance water quality and so on. There are lifting pumps and liquid level controllers in the sewage collection tank. The liquid level controller can use liquid level floats, etc. to monitor the water level of the sewage collection tank through the liquid level controller, and then automatically control the opening and closing of the lifting pump. . The sewage in the collection tank is pumped to the water inlet of the pre-filter through the lifting pump, or the sewage collection tank can be set at a higher position, relying on gravity to make the sewage flow to the water inlet of the pre-filter, and then filtered by the pre-filter The finished sewage enters the first collection bucket, and the outlet of the first collection bucket is connected to the water inlet of the tubular ultrafiltration membrane, where the impurities with a particle size greater than 10 μm (such as suspended solids, Insoluble colloids, etc.), the filtered filtered water is collected in the second collection bucket. Among them, the pre-filter can be equipped with a 0.5-0.8mm filter screen to filter larger particles of debris, and the function of setting the pre-filter in front of the tubular ultrafiltration membrane is to remove larger particles of impurities in the sewage to avoid clogging Or damage the tubular ultrafiltration membrane, that is, as a security filter for the tubular ultrafiltration membrane.

The advantage of using a tubular ultrafiltration membrane after the prefilter is that the pretreatment requirements for the material and liquid are relatively simple, and it only needs to pass through a 0.5-0.8mm filter to remove the hard particles that will directly damage the membrane before entering the tube. Type membrane unit, due to the simple pretreatment, the input cost is saved, and the operating cost is saved. For the treatment of high-solid matter, high-concentration materials and liquids, the tubular membrane shows extraordinary capabilities, is not afraid of clogging, is not easy to produce concentration polarization, and can adjust the flow rate in a wide range to ensure its processing capacity.

Thereafter, in order to ensure that the water quality after treatment can meet the national standard for sewage discharge, a multi-stage RO system is installed behind the tubular ultrafiltration membrane, and the number of stages can be set according to actual needs. For example, the details are as follows:

The water outlet of the second collection bucket is connected to the water inlet of the primary RO system, the water outlet of the third collection bucket is connected to the water inlet of the secondary RO system, and the filtered water produced by the primary RO system enters the third collection After the barrel, it enters the secondary RO system for treatment, so that the effluent water quality meets the national standard "Urban Sewage Recycling and Utilization of Urban Miscellaneous Water Quality" (GB/T 18920-2002), and the filtered water treated by the secondary RO system is collected in In the clear water bucket, the reclaimed water can be reused after ultraviolet disinfection. It can be used to wash livestock pens, grounds, roads, vehicles, construction, urban greening, fire protection, etc., which improves the utilization rate of the original sewage.

The concentrated liquid treated by the primary RO system is stored in the fourth collection tank, and then pumped into the water inlet of the DTRO system through a lift pump, or the water outlet of the fourth collection tank is directly connected to the water inlet of the DTRO system. Preferably, the filtered water treated by the DTRO system enters the third collection tank to improve the utilization rate of water, and then is treated by the secondary RO system to ensure that the water quality of the effluent is stable and reliable, while the concentrated liquid treated by the DTRO system is stored In the fifth collection bucket, it can be further dehydrated and concentrated to make liquid organic fertilizer, and the fertilizer efficiency can be improved by increasing the nutrient concentration of the liquid organic fertilizer. In this way, the nutrients in the sewage can be highly concentrated for recycling.

In addition, in order to increase the water production rate of the first-stage RO system, the concentrated liquid treated by the second-stage RO system is returned to the second collection tank, and is recycled for treatment by the first-stage RO, second-stage RO and DTRO systems to further improve Treated water quality and recycling of nutrients in sewage.

In addition, a lift pump can also be provided in one, more or all of the first collection bucket, the second collection bucket, the third collection bucket, and the fourth collection bucket, and the sewage and filtered water can be collected by the lift pump. Or the concentrated liquid is pumped to the water inlet of the corresponding next-level system. In this way, each system can be set on the same horizontal line, making the overall look more beautiful; a liquid level controller can also be provided. The liquid level control The device can use a liquid level float, etc., to monitor the water level in each collection barrel through a liquid level controller, and then automatically control the opening and closing of the lift pump.

In order to further improve the degree of automation of the whole system and save labor costs, the present invention can be equipped with a control system in addition to manual control, which can automatically control all other systems to realize the automatic operation of the whole system.

In addition, there is a return pipe between the clear water bucket and the tubular ultrafiltration membrane system, the primary RO system, the secondary RO system and the DTRO system. When the tubular ultrafiltration membrane system, the primary RO system, the secondary RO system and the When the DTRO system is stopped and the sewage is emptied, the filtered water in the clean water bucket will flow back to each system through the corresponding return pipe to clean it.

By adopting the technical scheme of the present invention, solid-liquid separation can be performed on livestock and poultry breeding feces and urine to obtain solid organic fertilizers, and then treated by pre-filters and tubular ultrafiltration membranes, and then passed through a primary RO system, a secondary RO system, and DTRO The system cooperates with each other to meet the national sewage discharge standards and urban miscellaneous water quality standards, and can also obtain a higher concentration of liquid organic fertilizer, thereby achieving zero discharge of the sewage, avoiding pollution to the environment, and concentrating the nutrients of the sewage It can be recycled into liquid organic fertilizer, which improves the utilization rate of sewage, and can realize the automatic operation of the whole system and automatic cleaning of each system, reducing labor costs.

Although the invention has been particularly shown and described in connection with preferred embodiments, it will be understood to those skilled in the art that changes in form and details of the invention have been made without departing from the spirit and scope of the invention as defined by the appended claims. All changes are within the protection scope of the present invention.

Claims (10)

1. a kind of livestock and poultry cultivation sewage disposal zero-emission and organic fertilizer recovery system, it is characterised in that including：Separation of solid and liquid system System, the solid-liquid separation system is provided with sewage collecting pool, the solid in sewage and liquid is carried out after initial gross separation, by gained mistake Filtrate is collected in sewage collecting pool；

Pre-filtration system, the pre-filtration system includes prefilter and the first collecting vessel, and prefilter is in sewage collecting pool Sewage carry out pre-filtering, remove larger particles debris after, the sewage filtered is stored in the first collecting vessel；

Tubular ultra-filtration membrane system, the tubular ultra-filtration membrane includes tubular ultra-filtration membrane and the second collecting vessel, and tubular ultra-filtration membrane removes the Particle diameter is more than 10 μm of debris in the sewage of one collecting vessel, by the sewage collecting after ultrafiltration in the second collecting vessel；

Multistage RO systems, the multistage RO systems include multistage RO, multiple collecting vessels and a scuttlebutt, and the multistage RO is to second The filter water of gained is stored in scuttlebutt by the sewage in collecting vessel after carrying out multistage filtering and concentration, by final concentrate Liquid organic fertilizer is made in dehydration.

2. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 1 and organic fertilizer recovery system, it is characterised in that The multistage RO systems include one-level RO systems, two grades of RO systems, DTRO systems, the 3rd collecting vessel, the 4th collecting vessel, five and received Collect bucket and scuttlebutt, the water inlet of the one-level RO systems is connected with the delivery port of the second collecting vessel, will filter what is obtained Filtered water collection is collected in the 4th collecting vessel in the 3rd collecting vessel, and by obtained concentrate；The water outlet of 3rd collecting vessel Mouth is connected with the water inlet of two grades of RO systems, and the clear water obtained after having filtered is collected in scuttlebutt；4th collecting vessel goes out The mouth of a river is connected with the water inlet of DTRO systems, and the concentrate after having been concentrated through DTRO systems is collected in the 5th collecting vessel, warp Liquid organic fertilizer is made after dehydration concentration.

3. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 2 and organic fertilizer recovery system, it is characterised in that After two grades of RO systems are filtered and concentrated to the filter water in the 3rd collecting vessel, concentrate is returned into the second collecting vessel Middle progress circulating filtration and concentration.

4. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 2 or claim 3 and organic fertilizer recovery system, its feature exist In, filter water resulting when handling the concentrate in the 4th collecting vessel is back in the 3rd collecting vessel by the DTRO systems, Filter and concentrate again through two grades of RO systems.

5. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 4 and organic fertilizer recovery system, it is characterised in that The recovery system also includes a control system, and solid-liquid separation system, pre-filtration system, tubular type are controlled by the control system The automatic running of ultrafiltration membrane system and multistage RO systems.

6. a kind of livestock and poultry cultivation sewage disposal zero-emission and organic fertilizer recovery system as any one of claim 1 to 5, Characterized in that, the sewage collecting pool and/or the first collecting vessel and/or the second collecting vessel and/or the 3rd collecting vessel and/or An elevator pump is respectively provided with four collecting vessels, by the elevator pump by sewage, filter water or concentrate pump to corresponding next stage system The water inlet of system.

7. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 6 and organic fertilizer recovery system, it is characterised in that In the sewage collecting pool and/or the first collecting vessel and/or the second collecting vessel and/or the 3rd collecting vessel and/or the 4th collecting vessel Be additionally provided with fluid level controller, the fluid level controller is liquid-level floater, the fluid level controller by monitor sewage collecting pool and Actual water level in each collecting vessel automatically controls the opening and closing of each elevator pump.

8. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 6 and organic fertilizer recovery system, it is characterised in that A filter screen is provided with the prefilter, the aperture of the filter screen is 0.5~0.8mm.

9. a kind of livestock and poultry cultivation sewage disposal zero-emission as claimed in claim 6 and organic fertilizer recovery system, it is characterised in that A return duct is respectively provided between scuttlebutt and the tubular ultra-filtration membrane system, one-level RO systems, two grades of RO systems and DTRO systems, When each system is out of service and sewage is emptied, the filter water in scuttlebutt will be back to each system simultaneously by corresponding return duct It is cleaned.

10. the handling process that a kind of livestock and poultry cultivation sewage disposal zero-emission and organic fertilizer are reclaimed, it is characterised in that using such as right It is required that the livestock and poultry cultivation sewage disposal zero-emission and organic fertilizer recovery system any one of 1 to 9 are entered to livestock and poultry cultivation sewage Row processing.