With the continuous improvement of living standards, people's demand for meat and eggs has greatly promoted the continuous increase of aquaculture, and large-scale aquaculture will impose a great burden on the environment. The wastewater generated in aquaculture contains a large amount of pollutants, such as CODcr, ammonia nitrogen, heavy metals, residual veterinary drugs, and a large number of pathogens. After entering the water, the decomposition of organic matter will consume a large amount of dissolved oxygen in the water, causing the water to become foul smelling and leading to the death of a large number of aquatic organisms; Nitrogen and phosphorus can cause eutrophication of water bodies.

After investigation and analysis of aquaculture wastewater, it was found that the manure water from large-scale pig farms contains diseases and other pollutants that flow with the water. There are two main treatment methods: comprehensive utilization and treatment to meet discharge standards. 1. Comprehensive utilization is a good way to utilize biomass energy at multiple levels, build ecological agriculture, and ensure sustainable agricultural development; To meet emission standards, it is necessary to seek low operating costs, efficient treatment, and low facility investment in order to solve pollution problems in the low profit farming industry.

2、 Introduction to the process flow of pig farm wastewater treatment

Regarding the characteristics of wastewater from pig farms, most domestic processes currently use solid-liquid separation anaerobic digestion aerobic treatment for treatment

1. The sewage is first collected and enters the grid to remove suspended solids of large particles, and then enters the physicochemical reaction sedimentation tank to remove suspended solids, color, and some COD. The effluent from the primary sedimentation tank enters the anaerobic tank, mainly to degrade large molecule organic pollutants into small molecule pollutants, which are thoroughly degraded in the contact oxidation tank. The effluent from the secondary sedimentation tank enters the clean water disinfection tank and achieves sterilization effect through disinfection.

2. The anaerobic facultative combined biological pond is used as the main process, and the upflow anaerobic sludge bed is transplanted to the facultative pond. After treatment, the BOD, COD, and NH-N of pig farm wastewater can be reduced from 9000, 14000, and 1200 to 20, 60, and 65 mg · L-1, respectively.

3、 Summary of Selection of Wastewater Treatment Processes for Pig Farms

Livestock and poultry breeding wastewater generally requires a combination of multiple treatment technologies. A/O body is an activated sludge treatment process that combines the dual functions of removing BOD and denitrification. Although its investment is relatively high, the water treated by this method is easy to meet the discharge standards. Therefore, for large-scale aquaculture farms with high wastewater production and strong economic capacity, A/O method can be chosen, while for medium-sized farms, aerobic treatment processes such as contact oxidation and biological spinning can be selected; Anaerobic natural treatment mode, suitable for small and medium-sized scale aquaculture farms; The other is the anaerobic aerobic utilization mode, which is suitable for large and medium-sized livestock and poultry farms or breeding areas.

Here, Gundam Environmental reminds us when selectingWastewater treatment of pig farmsThe process should be combined with the different types of aquaculture in the farm, different methods of manure removal, and adopt a combination treatment method based on the water quantity and quality. The investment, daily operating costs, and ease of operation of this treatment method should be comprehensively considered.

4、 The benefits of pig farm wastewater treatment project

For example, there are 600 pigs in the pig farm, and the farm data shows that the wastewater discharge is 25-30m3/d. The treated water quality shall meet the requirements of the "Irrigation Water Quality Standards for Farmland" (GB5084-92) and be used for irrigating nearby farmland. The generated sludge shall be used for fertilizing nearby farmland.

Parameters: Design processing capacity of 3 tons per hour; The normal startup time is 20 hours per day. Emissions m3/d COD≤7000、BOD5≤4500、SS≤1600、NH3-N≤450。 Adopting mature and reliable technology UASB+SBR. Taking into account the terrain, geology, hydrology, and other conditions of the site, the land area is approximately 130m2.

According to the engineering plan calculation, the daily operating cost of the project is 47.46 yuan, and the operating cost per ton of water is 1.58 yuan (calculated based on processing 12 hours per day).

By adopting the developed complete set of technologies for the treatment and utilization of pig farm manure and water pollution, the efficiency of existing livestock and poultry waste disposal technologies in China can be greatly improved, greatly reducing the pressure of livestock and poultry farming on the agricultural ecological environment.

5、 Gundam Service Guide

1. In order to create better sewage treatment equipment, the parameters of this product will be updated with the continuous improvement of the equipment by the company. Please keep in touch with our company at any time.

If the equipment parameters you want are different from those in this manual, our company can make design changes according to the customer's requirements.

6、 How to choose good sewage treatment equipment

Choosing the right reliable manufacturer is crucial when selecting a good sewage treatment equipment.

Gaoda Environmental Protection Technology specializes in customized production of sewage treatment equipment suitable for you, just for your satisfied smile.

With 15 years of experience in the environmental protection industry, we have provided high-quality equipment to thousands of enterprises, and Gundam Environmental Protection Technology is even more trustworthy.

A self-produced and self selling enterprise with guaranteed quality and quantity is a better choice.