& nbsp;Process Introduction
& nbsp; The pre-treatment process mainly includes equipment and facilities such as grilles, sedimentation tanks, collection wells, solid-liquid separators, sedimentation regulating tanks, drying plants, etc., as well as measures such as rain and sewage separation and dry manure cleaning should be taken in pig houses.
& nbsp; a grille
& nbsp; Intercept impurities such as longer fibers and hairs in livestock and poultry wastewater. Manually clean the surface debris of the grille at regular intervals.
& nbsp; The plane size is 0.6m × 0.7m, with two grids installed. The gap between the coarse grid bars is 25mm, and the gap between the fine grid bars is 15mm. The inclination angle is set at 45 °?.
& nbsp; Sand settling tank
& nbsp; Settling livestock and poultry
The larger sand particles in the wastewater should be cleaned regularly to reduce the wear of the sludge lift pump in the collection well and the amount of sludge in the subsequent process.
& nbsp; The plan size is 1m x 1m, with an effective water depth of 0.8m, and it is a brick concrete structure. This sedimentation tank is specially designed for the characteristics of livestock and poultry wastewater. A water flow baffle is installed at the front of the sedimentation tank, and the wastewater collides with the baffle to form a vortex flow, reducing the flow velocity and achieving rapid settling of suspended solids.
& nbsp; Collecting well
& nbsp; Used for temporarily storing livestock and poultry wastewater to ensure the normal operation of subsequent solid-liquid separators. The well is equipped with a mixing device, sludge lifting pump, and water level automatic control liquid level probe.
& nbsp; The overall size is 2.5m × 2.5m, the effective water depth is 2.3m, the effective volume is 11.3m3, the brick concrete structure, and the mixing device has a power of 1.1KW.
& nbsp; Solid-liquid separator
& nbsp; Solid liquid separation is an important measure in the wastewater treatment process of livestock and poultry farms. Wastewater can achieve the following goals through solid-liquid separation: firstly, to prevent larger solids from entering the subsequent treatment process, avoid channel blockage, and improve operational reliability; 2、 Reduce organic load, shorten anaerobic retention time, and achieve the goal of reducing investment costs.
& nbsp; This process uses one LK-60 solid-liquid separator, which can process 20 tons of wastewater per hour, with a supporting work rate of 2.5KW. After dehydration, the moisture content of the manure residue is 60-65%, and the TS is reduced by 35%.
& The LK-60 solid-liquid separator is specially developed for the characteristics of livestock and poultry breeding wastewater. The whole machine is made of stainless steel material and adopts a double-layer 0.4mm water cut groove grid filter screen. It has a reverse high-pressure water spray washing structure. The filtration, squeezing, washing, and shutdown are fully automatic controlled, achieving unmanned operation, low failure rate, and excellent price performance ratio.
& nbsp; & nbsp; Sedimentation regulating tank
& nbsp; By utilizing the good settling performance of solid matter and fast decomposition (hydrolysis, acidification) of organic matter in livestock and poultry wastewater, the concentration of fecal wastewater can be fully reduced; Store and regulate the water quality and quantity of anaerobic fermentation treatment, so that concentrated and intermittent inflow becomes balanced and continuous outflow.
