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Currently, the fecal sewage discharged by people in the city flows along the urban sewage pipe network, and some flows to the urban sewage treatment plant for treatment, and some Others are directly discharged into rivers, lakes, and seas and rely on natural purification. The utilization efficiency is very low, which is a huge loss. It is predicted that in the future, urban sewage treatment plants will be transformed into large-scale biogas fermentation plants. The fecal sewage discharged from people's lives and the fecal sewage discharged from farm animals will become the raw materials for large-scale biogas fermentation plants. Biogas will be generated through bacterial fermentation and purified. After purification, it becomes renewable gas with methane as the main component, which is then transported along natural gas pipelines to the kitchens of thousands of households for cooking and cooking. The biogas residue discharged from large-scale biogas fermentation plants can be used to feed pigs, fish, eels, and earthworms. It can also be used as a vegetable culture medium for soilless cultivation, and the biogas residue can be turned into fresh vegetables, pork, and fish. The biogas produced from the excrement is used to ignite the fire, and the vegetables, pork and fish transformed from the biogas residue are fried. In this way, the excrement is turned into delicious dishes and returned to the dining table for people to enjoy.

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Crush and stir organic matter such as animal feces, sewage, plant straw, leftover rice, leftovers, rotten fruits, dishwashing sewage, sludge in ditches into a thin paste, and pump it to the isolation point with a mud pump In a special fermentation tank with air, through human intervention, the appropriate temperature and pH in the fermentation tank are adjusted. Under the fermentation of bacterial microorganisms, a large amount of biogas can be generated in 1-7 days. Biogas is a secondary energy source and a renewable energy source. The main components of biogas are 50%-80% methane gas, 20%-40% carbon dioxide, and a certain amount of nitrogen, oxygen, hydrogen sulfide and hydrogen. Carbon dioxide gas is flame retardant. The combustion of hydrogen sulfide will produce sulfur dioxide gas, which will pollute the environment. Hydrogen gas will make a popping sound when burning, which is more dangerous. Therefore, biogas must be purified and separated before it can be used as natural gas energy. This may be the reason why biogas fermentation plants have not been developed on a large scale.

The principle diagram of activated carbon adsorption comes from the Internet and has nothing to do with the text

First, pass the biogas mixture through the activated carbon filter to adsorb and remove a small amount of toxic hydrogen sulfide gas in the biogas.

Gas purification tank equipment, irrelevant to the text

The only remaining gases are methane, carbon dioxide, nitrogen, oxygen and hydrogen. These gases are sucked into the vacuum piston steel tank. The density of methane gas is 0.717 g/L, the density of nitrogen is 1.25 g/L, the density of oxygen is 1.429 g, the density of hydrogen is 0.089 g/L, and the density of carbon dioxide is 1.977 g. /L, the carbon dioxide gas has the highest density, and the carbon dioxide gas will be deposited at the bottom of the separation piston tank. Open the air outlet below the separation tank, and use another piston to seal the tank to slowly pump the carbon dioxide gas in from the bottom of the tank. There is carbon dioxide gas at the nozzle. The sensor will automatically generate an alarm signal after the carbon dioxide gas is pumped out, and pass it to the microcontroller to automatically block the gas outlet. The collected relatively pure carbon dioxide gas is then passed into the dry ice manufacturing equipment, and through pressurization and work, dry ice is produced and sold to users in the fields of aerospace, aviation, military industry, chemical industry, nuclear industry, fire protection, catering and fresh-keeping transportation.

Using the same principle, oxygen, nitrogen, and methane gas are extracted in sequence to complete the purification of methane gas. The methane gas with a purity of more than 98% is obtained, which is transported to thousands of households through natural gas pressure equipment and is billed according to the gas meter. Its combustion calorific value is higher than that of natural gas, and its cost is lower than that of natural gas. The purified oxygen, nitrogen and hydrogen are sold to related fields respectively.

Raising earthworms with biogas residue

Finally, sell the biogas residue to pig farmers, fish farmers, and earthworm farmers in exchange for money. You can also extend the industrial chain, raise these animals yourself, and sell them to the market. Supply finished products with higher profits. There is nothing left in the wastewater. It is purified and transported back to thousands of households through city tap water pipes, and is billed according to the water meter.

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A large biogas fermentation plant is equivalent to a large oil and gas field. It can at least meet the gas needs of residents and has many by-products. It also fulfills the following duties: Social responsibilities such as urban sewage treatment. In big cities like Beijing, Shanghai, Guangzhou, and Tianjin, the annual output value of a large-scale biogas production and manufacturing enterprise will reach about 20 billion yuan. In terms of raw materials, no penny will be spent, and there will be inexhaustible supplies. Exhaust, the tax exemption is very large. Except for equipment research and development and maintenance, labor wages, electricity input, and site costs, there are no other huge expenses. It is estimated that an investment of 10 billion yuan will be able to build a biogas fermentation, ecological breeding, and urban sewage treatment center. It is an integrated industrial cluster, and it is a one-time investment that will continue to benefit and truly turn waste into treasure. The maintenance cost is 1 billion yuan a year.

Large-scale biogas production enterprises should establish sparsely populated urban suburbs, and security and firefighting work must be in place, because gas is flammable and explosive, and places with high population density have many fire hazards and are very harmful.

Sparsely populated places are safer