沼气工程主要是通过厌氧发酵及相关处理降低粪水有机质含量，达到或接近排放标准并按括厌氧发酵主体及配套工程技术设计工艺要求获取能源—沼气。沼气利用产品与设备技术，主要是利用沼气或直接用于生活用能，或发电、或烧锅炉、或直接用于生产供暖、或作为化工原料等：沼肥制成液肥和复合肥技术，则主要是通过固液分离，添加必要元素和成份，使沼肥制成液肥或复合肥，供自身使用或销售。

　　Biogas engineering mainly reduces the organic matter content of manure through anaerobic fermentation and related treatments, meets or approaches emission standards, and obtains energy - biogas according to the technical design process requirements of anaerobic fermentation main body and supporting engineering. Biogas utilization products and equipment technology mainly utilize biogas for daily energy consumption, power generation, boiler burning, heating production, or as chemical raw materials. The technology of making liquid fertilizer and compound fertilizer from biogas fertilizer mainly involves solid-liquid separation, adding necessary elements and components, and making biogas fertilizer into liquid fertilizer or compound fertilizer for personal use or sales.

　　生物质沼气工程中的沼气池是通过使用废料、秸秆、禽畜粪便等发酵进行工作，而产生沼气的设备。使用一段时间就需要及时填料并清理残渣和废水。沼气池是如何处理污水的呢？

　　The biogas digester in biomass biogas engineering is a device that produces biogas by fermenting waste materials, straw, livestock manure, and other materials. After a period of use, it is necessary to promptly fill and clean the residue and wastewater. How does a biogas digester treat wastewater?

　　沼气工程的沼气池是如何处理废水的

　　How does the biogas digester in biogas engineering treat wastewater

　　沼气池处理养殖废水主要功能：一是降低了废水中的COD含量。据资料显示如果完全发酵，COD的去除率在80%以上。往往养殖场的沼气池都不能完全发酵即被排出。二是对畜禽粪便进行了无害化处理。即，由于沼气池厌氧发酵池，有害病菌会完全杀死。

　　The main function of biogas digesters in treating aquaculture wastewater is to reduce the COD content in the wastewater. According to data, if fully fermented, the COD removal rate is over 80%. Often, the biogas digesters in breeding farms cannot fully ferment and are discharged. Secondly, harmless treatment has been carried out on livestock and poultry manure. That is, due to the anaerobic fermentation tank of the biogas digester, harmful bacteria will be completely killed.

　　如果要想达标排放，就得让畜禽粪便充分发酵，然后对沼渣沼液进行分离处理。沼渣可以作为有机肥料使用。沼液进入防渗贮液池沉淀。在防渗贮液池的末端，再建一个生物净化塘，沉淀过的沼液可排入净化塘。塘内种植水生植物(如，水葫芦、茭白、荷藕等)。这样的处理措施可能会达标排放。

　　If we want to meet the emission standards, we need to fully ferment livestock and poultry manure, and then separate and treat the sludge and slurry. Biogas residue can be used as organic fertilizer. The biogas slurry enters the anti-seepage storage tank for sedimentation. At the end of the anti-seepage storage tank, build another biological purification pond, and the settled biogas slurry can be discharged into the purification pond. Planting aquatic plants (such as water hyacinth, water bamboo, lotus root, etc.) in the pond. This treatment measure may meet the emission standards.