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Animal Waste Processing

Aerial photo of farm, pig farm, farmer with dairy cows

DRYCAKE machines provide world-class performance on a wide variety of industrial process and wastewater treatment decanter centrifuges applications. Whether your process or wastewater treatment facility requires liquid-solid separation, sludge dewatering, or thickening of biological sludges, the DRYCAKE DR Decanter Centrifuge series has been developed for maximum capture rate efficiency and cake dryness at high throughputs with significantly reduced polymer consumption.

DRYCAKE DR Decanter Centrifuges can be used for separating solids from scrape or flush dairy barns, cattle feed lots as well as swine, poultry and other animal manure waste streams. These machines are also applicable for dewatering older lagoons sludges and sludges from both aerobic and anaerobic digesters. DRYCAKE DR Decanter Centrifuges are suitable for various aquaculture and fish waste, algae, and other wetland applications.

A wide range of manure slurry feed rates, feed solids concentrations and feed materials can be centrifuged. These machines can be used for manure separation and /or thickening prior to anaerobic digestion as well as for dewatering after anaerobic digestion. Minor coarse prescreening or maceration is typically recommended for large and miscellaneous debris.

DRYCAKE DR Decanter Centrifuges achieve high solids capture rates without polymer and will typically remove up to 90% of the suspended solids from fresh flushed dairy or swine manure waste without using chemistry for flocculation and over 98% solids capture with polymer and or natural chemistries. And the separated solids discharged from the machine typically yield a stackable cake of up to 32% dry weight material. Lower or higher removal rates possible with adjustments in feed rate, machine size, G force, or addition of chemistry.

Since removal of nitrogen and phosphorus are often important considerations it should be noted that approximately 25% of the nitrogen and roughly 70 to 80% of the phosphorous are removed in the separated solids sludge phase on swine manure, and up to 90% of the phosphorous is removed when 98% of the suspended solids are separated from the dairy manure waste stream. This mechanical separation substantially removes the specific nutrients which cause the greatest problems associated with land irrigation/application and the resulting water pollution.

The following diagram depicts a simple mechanical dewatering cow manure process for concentrating waste from scrape dairy barns using compost bedding. Use of traditional and natural polymers can dramatically improve quality of centrifuge centrate discharge.

Cow manure process diagram

Per the above diagram Langley Separation and Process can deliver complete turnkey screw press and decanter centrifuge systems featuring custom automation / control panel, pumps, discharge chutes, pipe work, feed / receiving tanks, polymer systems, skid packages, platforms, and other accessories and customized options.

DRYCAKE DR Decanter Centrifuges offer numerous advantages on animal waste applications:

Mobile onsite application test units

LS&P and DRYCAKE maintain a full scale mobile decanter centrifuge test trailer for onsite application testing and centrifuge pilot testing. Portable systems feature a production model centrifuge mounted in a trailer with all the system controls and ancillary equipment such as pumps, polymer systems, and sludge auger as well as connection hoses for a complete set-up.

A typical one-week test program is specifically designed to evaluate performance, provide operational data, and determine optimal centrifuge capacity on representative material as well develop treatment experience with the centrifuge process. The test program will typically consist of a series of predetermined test runs designed to evaluate the cause-effect relationship between certain key performance parameters:

  1. Throughput vs. cake solids
  2. Throughput vs. solids capture rate
  3. Polymer addition /selection and effect on cake solids / solids capture rate