The breeding industry occupies an important position in China, especially pig breeding. Pork is dominant in the meat consumption of urban and rural residents. The annual pork output is over 50 million tons. The domestic demand for pork is huge, and at the same time, the entry threshold for pig farming is relatively low, which places great pressure on environmental protection. Almost all small and medium-sized pig farms do not have the necessary environmental protection measures. Wastewater is discharged freely, manure is randomly stacked, the river water is polluted, and the environment is polluted.
Pig farming has entered a modern and large-scale stage, and farming wastewater can also be properly and centrally treated. The solid-liquid mixture of aquaculture wastewater contains suspended matter, high organic matter concentration, high ammonia nitrogen, phosphorus content, and high odor. With the increase of labor, feed and other costs, pig farming has entered a low-profit era, so the treatment of farming sewage should also reduce costs as much as possible.
Common methods for treating aquaculture wastewater are filtration, sedimentation, and solid-liquid separation. Equipment such as grills, air flotation, and solid-liquid separators are required, and 2-3 sedimentation tanks need to be built. However, the cost of this kind of investment is not to mention, the water content of the mud cake after solid-liquid separation is too high, and the content of COD and ammonia nitrogen in the water still exceeds the standard, which fails to meet environmental protection requirements.
With a certain scale of breeding farms, anaerobic and aerobic wastewater are generally used for pretreatment of sewage in the early stage. The difficulty of treating aquaculture wastewater lies in its deep chroma, large odor, and high organic content, which is exactly what the stacked snail sludge dewatering machine can solve. The aquaculture wastewater is flocculated, and the organic matter and suspended matter in the sewage will flocculate into alum flowers. After the concentrated dehydration treatment of the snail sludge dehydrator, solid-liquid separation is achieved. The mud cake with low water content can be used as organic fertilizer. It becomes colorless and odorless clear water and meets the secondary emission standard.
The use of a stacked screw machine can eliminate the need for air flotation and the construction of sludge sedimentation tanks, reducing the cost of civil construction. The stacked screw machine has a high degree of automation and can run continuously and smoothly. The entire dehydration operation process does not require manual intervention to achieve human mud. Separation. The sewage is dehydrated in a closed space, and the odor will not evaporate.
Large-scale farms need to solve the environmental pollution problem reasonably. Use scientific methods and suitable equipment to treat aquaculture wastewater to reduce the threat to the surrounding environment.