Water flushing process is a large and medium-sized pig farm cleaning process
The water flushing process is the main mode of defecation used when China introduced large-scale pig raising technology and management methods from abroad in the 1980s. The main purpose of the process is to timely and effectively remove feces and urine in the livestock house, maintain the sanitation of the animal house, reduce the labor input in the process of manure cleaning, and improve the automation management level of the farm. The method of flushing water into the manure is that the manure and urine are mixed into the manure groove under the gap floor, and the water is flushed from the water nozzle of the ditch several times a day. The manure water flows into the main trunk of the manure into the underground septic tank or is pumped to the ground septic tank.
Investment situation: The water flushing system is designed and constructed at the time of construction. The manure collection system does not require separate investment. The high-pressure nozzles are about RMB100 each. Sewage pumps cost about RMB 2,000 per unit, and a sewage collection system requires at least three sewage pumps. Labor costs are minimal. Subsequent manure treatment process requires solid-liquid separation. The solid-liquid separation covers an area of ​​about 50m2. It adopts a screw-extruded solid-liquid separator, each of which is about RMB 90,000 (LJG-1 type). (Good feed tips: the price is on the go ,Change).
Operating expenses mainly include: water, electricity and maintenance. A pig needs 20-25L of water per day. The electricity cost is mainly from the water nozzle and the sewage pump. The maintenance fee is about 3,000 yuan / month ((good feed tips: the price is on the market, there are changes)).
Advantages: The water flushing method can keep the environment in the pig house clean and is conducive to animal health. The labor intensity is small and the labor efficiency is high, which is beneficial to the health of the farm workers and is more suitable in areas where the labor force is lacking.
Disadvantages: The water consumption is large. A 10,000 pig farm consumes a lot of water (200-250m3) every day to wash the pig's droppings. The concentration of pollutants is high, the COD is 11000-13000mg/L, the BOD is 5000-6000mg/L, and the SS is 17000-20000mg/L. After solid-liquid separation, most of the soluble organic matter and trace elements remain in the sewage, and the concentration of pollutants in the sewage is still high, while the separated solids have low nutrient content and low fertilizer value. The process is not technically complex and is not affected by climate change, but the infrastructure investment and power consumption of sewage treatment are high.
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