Analysis and application of biogas residue and liquid separation technology

The separation of sludge and liquid is an important part of the biogas production process. Effective separation technology can not only improve the utilization rate of resources, but also reduce environmental pollution. The following is an analysis and application of sludge and liquid separation technology: I. Overview of separation technology: 1. Natural sedimentation method: suitable for small-scale biogas treatment. The solid matter is allowed to settle naturally by standing, and then the supernatant is discharged. 2. Screw extrusion separation: The biogas is squeezed by the rotation of the screw shaft to separate the solid and liquid. This method is suitable for larger-scale biogas treatment. 3. Centrifugal separation: The solid and liquid are quickly separated by centrifugal force, which is suitable for high-concentration biogas treatment. 4. Screen filtration: The solid particles are intercepted by screens with different apertures, and the liquid flows out through the screen. II. Separation process: 1. Pretreatment: The fermented biogas usually needs to be pretreated, such as removing large particles, adjusting the pH value, etc., to meet the treatment requirements of the separation equipment. 2. Separation process: According to the selected separation technology, the biogas is sent to the separation equipment for solid-liquid separation. 3. Post-treatment: The solid biogas residue after separation needs to be dehydrated to reduce the moisture content for easy storage and utilization; the separated biogas liquid can be further processed or directly used. III. Application fields: 1. Agricultural utilization: The separated biogas residue can be used as organic fertilizer raw material, and the biogas liquid can be used as liquid fertilizer or irrigation water. 2. Animal husbandry: The separation of biogas residue and biogas liquid can reduce the pollution of feces to the environment, and the separated solids and liquids can be used in animal husbandry. 3. Environmental protection industry: Through the separation of biogas residue and biogas liquid, the pollution of biogas liquid to water bodies can be effectively reduced, and the utilization efficiency of solid organic matter can be improved. IV. Advantages and challenges: 1. Advantages: Improve resource utilization efficiency, reduce environmental pollution, and reduce subsequent processing costs. 2. Challenges: The investment in separation equipment is large, the operation and maintenance costs are high, and professional operators are required. Through the above introduction, we can see that biogas residue and biogas liquid separation technology plays an important role in agricultural environmental protection and resource recycling. Mastering appropriate separation technology can effectively promote the resource utilization of biogas residue and biogas liquid.