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Large cattle ranch in North China harmless waste treatment options


And beneficial bacteria, plants and animals and human life and the environment are very useful. 3.2 Economic Analysis 奶牛养殖业 not only the heavy pollution and low profit, high risk, it is not as industrial wastewater, sewage control it,[link widoczny dla zalogowanych], take the simple way of governance. According to state According to estimates, the establishment of a modern waste treatment facilities harmless, head over to the breeding of dairy farm size l00o have run profits, the same can also save a lot of sewage and garbage disposal fees. 4, process routes to be technology used in North China, annual accumulated We believe that the best way to deal with cattle manure anaerobic digestion is the construction of two devices, with the temperature fermentation. At room temperature with the old and new high-temperature fermentation fermentation compared to using this process route, not only improves power handling capacity and can save energy, you can also get higher gas production, methane emissions from agricultural residue and the slurry can meet the production of fertility needs. Using this technology, in North China cow manure per day can produce 1.2 to 1.5 cubic meters of biogas,[link widoczny dla zalogowanych], which is 50% methane content,[link widoczny dla zalogowanych], heat is 5500 kcal, fully meet the energy needs. Following is a daily output of 1,000 cubic meters of waste gas and wastewater process flow chart of sound for large-scale breeding of more than 1000 dairy farms. Less demanding in the surrounding environment, in areas convenient to use organic fertilizers, or some small-scale farms, equipment can be greatly simplified (especially the part with the box) to save costs: In the process, the SBP include sewage treatment facilities. For regions where conditions permit, the daily sewage emissions ≯ 20 tons of cases, can save this part of the equipment,[link widoczny dla zalogowanych], sewage (ie, slurry) can be directly fertilizers. 5 Economic Analysis of field production process of electricity, sewage treatment station and the power consumption of electricity and office buildings. The use of biogas slurry: sewage treatment station Nissan slurry 2oo tons. For organic vegetable cultivation, fish ponds and lawn irrigation. When the slurry not entirely consumed, and then for aeration, biological purification, including COD, BOD content of 200 mg / L and 60 mg / l, in line with the national emission standards (BG8978-1996), and then the purified water used for flushing water back to the farm. Under normal circumstances, about 100 tons of slurry as a liquid fertilizer, irrigation of crops and fish ponds; another 100 tons of slurry by aerobic treatment and after biological purification of water used for washing. The use of biogas: solid-liquid separator feed produced 5.6 tons per day, for 500 acres of ponds for fish or vegetable fertilizers. Benefits of the project total of 130 million / year, of which: gas revenue 4l million / year (including power generation income), other income of 66 million products / year,[link widoczny dla zalogowanych], reduce sewage and waste disposal fees l2 million / year, the project runs Total cost is: 435,600 yuan / year. Economic Analysis of financial evaluation of the project results and calculated parameters as follows: the above table shows that the following two points: (1) the project's economic internal collection equipment and the building process of the main project investment is estimated at 4.827 million million, including interest of construction period a total investment of 5.629 million yuan, of which 968,000 yuan civil engineering. The use of biogas: Engineering an average daily output of 1,000 cubic meters of biogas can be used for household farms and the surrounding gas. Sufficient funds for construction can also be used for biogas power generation (100 kW) at 1700 kwh electricity, interest rates are higher for the culture, the minimum is also reached l3.88%, and regardless of whether the effects of the environment taking into account the interest on the investment This is true. This shows that such projects have a good social environment effects. (2) from a financial point of view, such project efficiency is rather poor, even if the interest rate cut in Kaolv conditions, the NPV is still negative, the internal return rate is still below 10%. Only do not take into account the national interest or investment preferential policy for the implementation of effective, its effectiveness is possible better. Engineering revenue mainly from the following: (1) sell gas; (2) the sale of particulate organic fertilizer; (3) manufacturing renewable feed; (4) slurry used in agricultural fertilizers and increase alternative income; (5) slurry with alternative in the fish feed and increase production; (6) to reduce sewage and waste disposal fee. Investment in construction costs as much. The level of engineering economy to a large extent constrained by the size of the project, which limits the size of farms. In general, the project small and poor economic returns. U
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