According to the statistics of the Ministry of Housing and Urban-Rural Development, more than 3000 urban sewage plants have been built at present, and the total scale of newly-built county towns and small-scale sewage treatment facilities in the west during the "Twelfth Five-Year Plan" period will reach 45 - 46 million tons/day. Therefore, the demand for efficient and low-consumption sewage treatment processes in small towns is becoming increasingly urgent. The main invention points of the project are as follows:
Key invention point 1: Through the development of an efficient and intensive sewage biological treatment tank, the functions of the AO-SBR biological treatment tank and the sedimentation tank are fully combined, avoiding the shortcomings of traditional sewage plants that need to be built separately and have many facilities. In order to ensure the separation effect of the sequencing tank, inclined plates or inclined pipes are used in the sequencing tank to increase the separation area and ensure the separation effect. In the reaction stage, the microorganisms attached to the fillers and activated sludge synergistically degrade deeply. In addition, through the composite process of fixed bed biofilm and activated sludge, the sludge concentration in the bio-reactor tank can be doubled and the SRT can be extended, allowing the system to cope with higher loads while meeting emission requirements.
Key invention 2: In view of the water quality characteristics containing a high proportion of industrial wastewater, the UC anaerobic hydrolysis acidification tank developed has been verified through multiple engineering cases. It has been verified that the technology distributes water evenly to each point, and the hydraulic stirring effect is good; by setting a dross baffle, it is avoided that dross enters the hydrolysis tank and causes clogging of water distribution branches; at the same time, the configuration considers the larger diameter of the distribution pipe, which is not easy to block, and clear holes are set in the upper part to prevent blocking and clear in a timely manner; Monitor the liquid level of the distribution tank to keep track of the operation situation and ensure the stability of the system. Obtains good hydrolysis effect, greatly improves the biodegradability of sewage, and ensures that the operation of subsequent units meets standards.
Key invention point 3: With the diversification and complexity of sewage treatment processes, the land area required is becoming larger and larger. The invention provides an intensive sewage advanced treatment combined pool with compact land occupation and low energy consumption. Through the development and application of this process, some shortcomings in the current advanced sewage treatment process have been greatly improved, providing good technical support for the construction of urbanized sewage plants.
Key invention point 4: In traditional integrated sewage plants, because the inlet pump room is difficult to set up separately, the uniformity of the inlet flow pattern is limited by the passage of the inlet pipe and cannot be guaranteed, otherwise it consumes large investment and land. This technology not only solves the above problems, but also is compact and efficient, and solves the problems that have long plagued engineering design.
Key invention point 5: How to closely combine the normal water level of the discharged water body with the design elevation of the sewage plant, reduce head loss, reduce energy consumption, reduce operating costs, simplify management, and save land resources are key elements of the design. Comprehensive research shows that the multi-functional outlet pump house and high-level well developed by this technology can better solve this problem.
Key invention point 6: The sewage collection well developed by this process for river interception is flexible and adjustable, has few equipment and stable flow, is free from clogging, and is convenient to operation and management. This technology solves the problem of collecting drought-flowing sewage that seriously pollutes rivers without affecting normal flood control of rivers, and solves the problem of sewage collection and treatment in industrially developed cities in order to reduce river pollution.
Key invention point 7: Through the optimized design of the cover plate culvert sewage interception well, the early rain and dry flow sewage transported by the cover plate culvert is intercepted through the grille and collected. During heavy rain, rainwater is discharged into the river through the flap gate in the late stage, which is to prevent the early rain from polluting the river. The main collection measures ensure the river environment and intercept pollutants to the sewage plant for treatment.
Relevant technological inventions have been widely promoted and have been applied in demonstration projects such as Zhoushan, Yiwu, Jinshan, Shanghai, and Jinkai in Henan, saving nearly 300 million yuan in project investment and nearly 60 million yuan in annual operating expenses. In the next five years, the market share in this field will nearly expand, which is expected to create 3.5 billion yuan in engineering benefits, greatly saving project construction costs, and at the same time, bringing huge social and environmental benefits. The development and application of this technology will also be more suitable for the construction of sewage treatment plants with different treatment requirements such as ecological garden type, environmentally friendly type, technological improvement type, and standard type.