With increasingly stringent environmental regulations, meeting wastewater discharge standards at pig farms has become a rigid requirement. For small pig farms, a daily wastewater treatment capacity of around 10 tons is very common—these projects may be small in scale, but the environmental requirements are by no means low. Choosing the right equipment, process, and configuration can ensure compliance with discharge standards while controlling investment and operating costs. This article will discuss in detail the typical processes and key selection points for wastewater treatment equipment for pig farms with a daily treatment capacity of 10 tons.
DIEN integrated wastewater treatment equipment
1. Characteristics of Pig Farm Wastewater
Pig farm wastewater originates from pig manure, pigpen flushing water, and domestic sewage. Its water quality characteristics are very distinct:
High organic matter concentration: COD typically ranges from several thousand to tens of thousands of mg/L, far exceeding that of domestic sewage.
High ammonia nitrogen: Pig manure contains large amounts of urea and nitrogenous organic matter, resulting in prominent ammonia nitrogen levels.
High suspended solids: High content of solid impurities such as feces, feed residue, and silt.
Large fluctuations in water volume: High water volume during concentrated flushing, low volume at other times, and drastic changes in water quality.
Due to these characteristics, pig farm wastewater cannot be treated using ordinary domestic sewage treatment processes; targeted pretreatment and biological treatment units must be designed.
2. Typical Process Flow for a 10-ton/day Wastewater Treatment Unit
A typical wastewater treatment process for a pig farm with a daily capacity of 10 tons uses a combination of "pretreatment + anaerobic/hydrolysis acidification + aerobic biological treatment + sedimentation + disinfection":
The wastewater first passes through a screen to intercept large particles of feces, feed residue, and debris, preventing blockages in subsequent equipment. It then enters a regulating tank to balance water volume and quality to handle peak loads during flushing periods. Next, it enters a hydrolysis acidification tank or anaerobic tank to break down large organic molecules into smaller molecules, reducing the load on subsequent aerobic treatment. The aerobic stage commonly uses contact oxidation, where microorganisms degrade organic matter and ammonia nitrogen under aeration. Finally, the wastewater undergoes secondary sedimentation for sludge-water separation, and the effluent is disinfected before being discharged in compliance with standards.
For a 10-ton/day capacity, a buried integrated unit is typically used, integrating all treatment units into a single steel casing. The unit is prefabricated in the factory and transported to the site for hoisting and connection, resulting in a short construction period.
3. Core Advantages of Integrated Equipment
Why do small pig farms generally choose underground integrated equipment? There are several main reasons:
Small footprint: The equipment is buried underground, allowing for planting grass or parking on top, saving valuable ground space in the pig farm.
Fast construction: Factory prefabrication and on-site hoisting allow for installation and commissioning within a few weeks.
Labor-saving operation: Fully automatic control with timed operation of fans and pumps; pig farm managers only need to conduct periodic inspections.
Low odor: Fully enclosed underground operation reduces odor diffusion and improves the farm environment.
4. Points to Consider When Selecting Equipment
When selecting a 10-ton/day wastewater treatment system for a pig farm, don't just look at the price. Focus on the following:
Effluent standards: Does it comply with the "Livestock and Poultry Breeding Industry Pollutant Discharge Standard," or... Does the land require a higher Grade A or farmland irrigation standard? Different standards lead to significant differences in process configuration.
Manure and sludge separation method: If the pig farm has already implemented dry manure cleaning, the wastewater concentration will be much lower, and the process can be simplified; water-based manure treatment requires stronger processing capacity.
Site conditions: Should the equipment be placed indoors or outdoors? In northern regions, frost protection needs to be considered, requiring insulation or placement in a machine room.
Operation and maintenance costs: The power consumption of aeration blowers, the frequency of sludge removal, and the cost of chemicals can add up to a considerable expense in the long run.
5. DIEN Water Treatment: One-stop solution for pig farm wastewater
DIEN Water Treatment provides a one-stop service for the wastewater treatment needs of small and medium-sized pig farms and livestock farms, from on-site surveys, water quality analysis, and solution design to equipment production, installation, and commissioning. Underground integrated wastewater treatment equipment with a daily processing capacity of 5 tons to hundreds of tons can be customized to suit the wastewater conditions of livestock farms in Northwest China.
