Rural wastewater treatment equipment has its own characteristics, such as small footprint and ease of integration. It is not only suitable for domestic wastewater treatment but also for large-scale wastewater treatment. As a core processing equipment, it is currently a good assistant for wastewater treatment, and the integrated wastewater treatment equipment is cheap and cost-effective. The purification tank, a rural sewage treatment equipment, adopts an improved A/O + filtration technology, equipped with an advanced intelligent control system. It features a short installation period, short commissioning time, low investment and operational costs, high treatment efficiency, and secondary pollution characteristics. The current situation of rural sewage treatment in China starts from a low base, indicating immense market potential. This low starting point manifests mainly in two aspects. Firstly, the efficiency of sewage treatment is low. In recent years, the treatment rate of rural domestic sewage treatment equipment has been relatively low. Among the installed equipment, not many are operating normally. According to relevant statistics, the normal operation of rural sewage treatment equipment constructed in China may be limited, implying that most of the processing equipment will be modified or postponed in the future. On the one hand, the starting point is relatively low. On the other hand, national environmental protection policies, including those concerning the living environment of rural populations, are becoming increasingly stringent. The government's investment in village sewage treatment plants is increasing, indicating that domestic village sewage treatment holds tremendous market potential. Rural sewage treatment is widely recognized in the industry as the next blue ocean after the water sector. Currently, the primary discharge standard for most urban domestic sewage treatment processes is the B discharge standard. However, in reality, even the basic B discharge standard is not met for all objectives. For instance, CODcr and ammonia nitrogen are easily within the standard range, whereas total nitrogen and total phosphorus often fail to meet the standard. This situation may exist in the market due to low-level sewage quality monitoring and insufficient investment in domestic towns and villages. Effluent indicators are typically only monitored for CODcr and ammonia nitrogen. Furthermore, the sewage collection networks in towns and villages are generally poor. Groundwater, mountain springs, and rainwater mix into the sewage pipe network, leading to dilution of the influent concentration. Nevertheless, as domestic environmental protection requirements become increasingly stringent, and as more attention and investment are directed towards village sewage, this situation will become unsustainable, making it imperative to enhance the level of processing technology. Food wastewater includes wastewater discharged during the processing of alcohol, beer, monosodium glutamate, starch, lactose, citric acid, vegetable processing, and various soft drinks. If the wastewater is not treated in a timely manner, it can cause significant environmental pollution. Characteristics of sewage: The characteristics of food industry sewage include high content of organic matter and suspended solids, susceptibility to decay, generally low toxicity, seasonal variation in water quality and quantity, and a high proportion of high-concentration sewage. Its main hazards are eutrophication of water bodies, leading to the death of aquatic animals and fish, promoting the production of odor from organic matter deposited at the bottom of water, deteriorating water quality, and polluting the environment. Treatment method: This type of sewage is proposed to be treated primarily using a combination of air floatation, anaerobic, and aerobic processes. The sewage will first enter an oil separation and regulation tank, and then be pumped into an air floatation tank to remove most of the insoluble impurities and oils. Afterwards, it will undergo anaerobic and aerobic biological treatment. The water after biochemical treatment will meet the tertiary standard and be discharged into the urban sewage pipe network. The food industry encompasses numerous industries such as meat processing, aquatic product processing, dairy processing, canning production, brewing, and sugar manufacturing. Consequently, the food industry utilizes a wide range of raw materials and produces a diverse array of products, resulting in significant variations in the quantity and quality of wastewater discharged. Unlike other industrial wastewaters, food industry wastewater typically does not contain harmful substances such as heavy metals or pesticides, but its BOD and COD levels are generally higher. Since most of the raw materials used in the food industry are organic substances that can be digested by the human body, the biodegradability of food industry wastewater is generally good.
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