Organic wastewater is wastewater mainly composed of organic pollutants, which can easily cause eutrophication of water quality and pose significant harm. In industrial wastewater such as domestic sewage, food processing, and papermaking, organic substances such as carbohydrates, proteins, oils, and lignin are present. These substances exist in suspended or dissolved states in sewage and can be decomposed through the biochemical action of microorganisms. During its decomposition process, oxygen needs to be consumed, hence it is called an oxygen consuming pollutant. This pollutant can cause a decrease in dissolved oxygen in water, affecting the growth of fish and other aquatic organisms. After the dissolved oxygen in water is depleted, organic matter undergoes anaerobic decomposition, producing unpleasant odors such as hydrogen sulfide, ammonia, and mercaptan, further deteriorating the water quality. The composition of organic matter in water is very complex, and the concentration of oxygen consuming organic matter is commonly expressed as the amount of oxygen consumed during the biochemical decomposition process of oxygen consuming substances per unit volume of water, which is expressed as biochemical oxygen demand (BOD). Generally, it is expressed as the five day biochemical oxygen demand (BOD5) at 20 ℃.

主要客戶群

Main customer groups

有機廢水沼氣發電機組主要客戶群：造紙廠、酒精廠、淀粉廠、藥廠、生化廠等目前檸檬酸、酒精、造紙廠等工業生產中治理“三廢”所需的費用越來越高，去年開始的“環保風暴”更是使三廢治理工作成為企業生死存亡的大事情。

The main customer groups of organic wastewater biogas power generation units include paper mills, alcohol factories, starch factories, pharmaceutical factories, biochemical factories, etc. Currently, the cost of treating the "three wastes" in industrial production such as citric acid, alcohol, and paper mills is increasing. The "environmental storm" that began last year has made the treatment of the three wastes a matter of life and death for enterprises.

工業生產的“三廢”治理主要有三大途徑：

There are three main ways to treat the "three wastes" in industrial production:

一是對“三廢”采取合理有效的治理方法;

One is to adopt reasonable and effective governance methods for the "three wastes";

二是改進合成工藝，將污染消滅在生產工藝過程中;三是對“三廢”合理利用，變廢為寶。

The second is to improve the synthesis process and eliminate pollution in the production process; The third is to make reasonable use of the "three wastes" and turn waste into treasure.

要從根本上消滅污染，關鍵是要對產生污染的每一個環節和步驟進行認真分析和研究，把污染消滅在工藝生產過程中，實現清潔生產。另外，要大力開發廢物的綜合利用技術，增加企業的經濟效益，保證企業的競爭優勢。 我們這里討論的 “三廢”主要指其中的有機廢水。工業有機廢水來源很多，主要來自檸檬酸、制糖、酒精、造紙、養殖、PTA等行業，這些行業目前處理污水的主流方式是采用生化法進行處理，處理過程中產生大量沼氣，根據估算，每生產一噸檸檬酸可產生大約225方沼氣，其中甲烷含量可達60%左右，這種沼氣用于發電是一種非常好的燃料，每方沼氣可以發1.7度電，效益非常可觀。生產一噸酒精可產生300方沼氣，甲烷含量可達70%，熱值更高。其它行業類同，產生的沼氣量都很可觀。

To fundamentally eliminate pollution, the key is to carefully analyze and study every link and step that produces pollution, eliminate pollution in the production process, and achieve clean production. In addition, efforts should be made to develop comprehensive waste utilization technologies to increase the economic benefits of enterprises and ensure their competitive advantage. The "three wastes" we are discussing here mainly refer to organic wastewater. There are many sources of industrial organic wastewater, mainly from industries such as citric acid, sugar making, alcohol, papermaking, aquaculture, PTA, etc. Currently, the mainstream method for treating wastewater in these industries is to use biochemical methods for treatment. During the treatment process, a large amount of biogas is generated. According to estimates, each ton of citric acid produced can produce about 225 cubic meters of biogas, with methane content reaching about 60%. This biogas is a very good fuel for power generation, Each square meter of biogas can generate 1.7 kWh of electricity, with significant benefits. Producing one ton of alcohol can produce 300 cubic meters of biogas, with a methane content of up to 70% and a higher calorific value. Similar to other industries, the amount of biogas produced is considerable.

節源又環保

Energy saving and environmental protection

沼氣池采用推流式厭氧發酵工藝，新建9個地下池，容積為1200立方米。沼氣池需達到10至25℃的常溫才能產氣，公司通過修建地下池、加厚土層保溫、利用發電機熱水和煙氣回收加溫、豬舍消毒水分流等手段，在現處冬季低溫度1至3℃的氣候條件下，使沼氣池的溫度達到19℃以上，已安裝運行近一個月的60千瓦沼氣發電機組，每天可發電6至8個小時，解決了冬季因溫度低不產氣發不了電的技術難題。到了夏秋兩季每天發電機組能發電10至12個小時，年發電量可達19萬千瓦/時，節省電費30多萬元。

The biogas digester adopts a push flow anaerobic fermentation process, and 9 new underground tanks are built with a volume of 1200 cubic meters. The biogas digester needs to reach a normal temperature of 10 to 25 ℃ in order to produce gas. The company has built underground digesters, thickened soil layers for insulation, utilized generator hot water and flue gas recovery for heating, and disinfected pig houses for water flow. In the current low winter temperature of 1 to 3 ℃, the temperature of the biogas digester can reach above 19 ℃. A 60 kW biogas generator set has been installed and operated for nearly a month, and can generate electricity for 6 to 8 hours per day, Solved the technical problem of not being able to generate electricity due to low temperature in winter. In the summer and autumn seasons, the power generation unit can generate 10-12 hours of electricity per day, with an annual power generation capacity of 190000 kilowatts per hour, saving over 300000 yuan in electricity bills.

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