Introduction

Livestock farms generate a large amount of pollutants every day, including cow dung, urine, and other contaminants, with a moisture content ranging from 85% to 90%. These pollutants contain a substantial amount of undigested organic matter and insect eggs, and may even harbor odor-producing microorganisms and pathogenic bacteria. If these pollutants are not properly treated and utilized, they can spread to surrounding land, rivers, and the atmosphere, exacerbating the hazards to humans and livestock. Cow dung is rich in nitrogen, phosphorus, potassium, and other essential elements for crop production. After treatment, it can be processed into organic fertilizer. The primary task in cow dung treatment is to reduce its moisture content. Currently, there are two types of equipment used to lower the moisture content of cow dung: cow dung dewatering machine and cow dung dryer. Their functions are similar, making it easy for users to get confused when choosing. I will introduce several aspects to help users quickly determine whether to choose a dewatering machine or a dryer.

What is cow dung dewatering machine?

Cow dung dewatering machine primarily achieves dehydration through a screw extrusion process. After the raw material enters the equipment through the feed inlet, it is continuously compressed under the continuous push of the spiral shaft, and the liquid is discharged through the gaps in the front screen. As the spiral shaft gradually becomes thinner and the pitch continuously decreases, the squeezing force on the material continuously increases. The water in the cow dung is discharged through a filter under pressure, achieving solid-liquid separation. Finally, the wet cow dung with a water content of 60-70% is discharged from the outlet. The odor of dehydrated cow dung is reduced, but it cannot be stored for long periods. Cow dung dewatering machine is suitable for small or medium-sized farms.

What is cow dung dryer?

Cow dung dryers remove moisture by exchanging hot air with wet cow dung and evaporating the water. The most common cow dung dryer is the rotary dryer, in the drum, wet cow dung exchanges heat with hot air and is continuously tumbled by lifting plates to improve drying efficiency. The exhaust gas after drying needs to be filtered through a dust removal system to remove harmful gases and odors. The dried cow dung with 10-20% moisture can be stored for a long time or used directly in the production of organic fertilizer granules. Cow dung dryers are suitable for large-scale livestock farms and organic fertilizer production enterprises.

Differences between cow dung dewatering machine and cow dung dryer

1. Final moisture requirements

The cow dung dewatering machine can only reduce the moisture content to 60-70%. If complete drying is required, a cow dung dryer is needed, which can reduce the moisture content to 10-20%.

2. Energy consumption

The cow dung dewatering machine has low energy consumption and cost, while the cow dung dryer requires a heating source and fuel, resulting in high energy consumption and cost.

3. Applicable scale

The cow dung dewatering machine is suitable for small and medium-sized farms, while the cow dung dryer is suitable for medium to large-sized farms or fertilizer production enterprises.

4. Discharge purpose

After dehydration, cow dung can be used for composting, worm feeding, simple fertilization, and biogas fermentation. After drying, cow dung can be used to produce finished organic fertilizer and fuel, meeting the requirements for long-distance transportation.

How to choose?

1. Based on processing capacity

If the daily processing capacity is less than 10 tons, a cow dung dewatering machine can be chosen. If the daily processing capacity ranges from tens to hundreds of tons, a cow dung dryer is recommended.

2. Consider the purpose

If the purpose is merely composting or fermentation, a cow manure dewatering machine can be chosen. If the finished product is intended to be used as granular organic fertilizer, or if there is a need for long-term storage or long-distance transportation, a cow dung dryer should be selected.

3. Check the budget

If the budget is limited, choose a cow dung dewatering machine. If the budget is sufficient, choose a cow dung dryer.

Conclusion

The cow dung dewatering machine is a pretreatment equipment for cow dung, while the cow dung dryer is a deep drying equipment for cow dung. When selecting cow dung processing equipment, it is necessary to comprehensively analyze factors such as processing capacity, usage, and budget to choose the suitable equipment. Contact us now to develop a cow dung dehydration and drying plan for you.