There are serious environmental risks and legal hidden dangers in landfill of domestic waste in residential backyards. I strongly recommend that you reconsider this plan. The following provide you with a more feasible solution from a professional perspective： 1. Environmental risk warning 1. Groundwater pollution: Food waste leachate contains high concentrations of organic matter and heavy metals, which can penetrate into underground aquifers. 2. Soil degradation: Waste decomposition products can destroy soil microbial communities and cause imbalances in pH value (studies have shown that the SOIL EC value in landfills can reach more than 3 times the normal value) 3. Greenhouse gas emissions: Anaerobic decomposition produces 200-400m3 methane per ton of organic waste, and GWP is 28 times that of CO₂ 2. Legal alternatives 1. Household composting system (cost savings of 30-50%) -Earthworm tower: The processing capacity is 1kg/day, and 1m3 space is required to produce eutrophic humus -Bocassi barrel: decomposed by EM bacteria, fermentation is completed in 7-10 days, and there is no odor discharge -Thermal composting: carbon-nitrogen ratio is 25-30:1, and the pile is turned over regularly to maintain a high temperature of 55-65℃ for sterilization 2. Municipal resource utilization - Food waste biogas power generation project (transportation subsidies are provided in some areas) -Rebate for sorting recyclables (the current price of PET plastic is about ¥2000/ton) -Special recycling of hazardous substances (battery/lamp disposal fee is included in the price) 3. If you insist on landfill, you need to know 1. Must meet： -The water table is 3m below the bottom of the pit (professional geological exploration is required) -The thickness of the clay layer is ≥1.5m (permeability coefficient≤1×10⁻2cm/s) -More than 15m from the residential foundation and more than 100m from the water source 2. Engineering specifications： -Layered compaction: every 30cm is covered with 15cm of quicklime + bentonite mixed layer -Trachea installation: Φ110mmHDPE tube, spacing 2m×2m plum blossom arrangement -Monitoring well setting: Build a Φ200mm monitoring well 30m downstream, and regularly test COD, BOD5, and NH3-N Special reminder: According to Article 41 of the "Law on the Prevention and Control of Environmental Pollution by Solid Waste", unauthorized disposal of domestic waste is punishable by a fine of 100,000 to 100,000 yuan. It is recommended to give priority to contacting the local sanitation department for the filing of small treatment facilities (record code: HJ-2023-SMRF) for professional and technical guidance.