System and method for co-processing sludge and wastewater by thermal power plant and urban sewage plant

Abstract

The invention discloses a system and a method for co-processing sludge and wastewater by a thermal power plant and an urban sewage plant. The system comprises an urban sewage pipeline, a sewage treatment plant municipal sewage sludge treatment system, a reclaimed water treatment system, a boiler make-up water system, a circulating water system, a boiler and water vapor system, a desulfurization system, a coal conveying system, a sludge drying treatment system and a turbidity and phosphorus removal treatment system. The system and the method can be used for efficiently treating urban sewage sludge and reclaimed water.

Description

Technical field[0001]The invention belongs to the field of energy conservation and environmental protection, and relates to a sludge and waste water treatment system and method, in particular to a system and method for co-processing sludge and waste water in a thermal power plant and a municipal sewage plant.Background technique[0002]At present, my country's sludge treatment methods mainly include landfill, composting, incineration, and other methods. According to the 2007 and 2016 Urban and Rural Construction Statistics Bulletins, the volume of sludge in my country in 2007 and 2016 was approximately 4.812 million m2.3And 10.596 million m3In the past ten years, my country’s sludge output has more than tripled. However, the disposal of sludge in our country is still based on landfill, and the proportion of agricultural use and incineration does not increase but decreases, and the development of sewage treatment and sludge disposal is seriously uneven. In the current situation of urba...

AI Technical Summary

Problems solved by technology

However, the disposal of sludge in my country is still dominated by landfill, while the proportion of agricultural use and incineration has not increased but decreased, and the development of sewage treatment and sludge disposal has been seriously unbalanced

Under the current tense situation of urban land use, landfill and natural drying methods are no longer suitable for sludge treatment in urban domestic sewage treatment plants

However, the composting capacity is limited, but the period of new sludge incineration treatment facilities is long and the initial investment is high. More and more power plants use the high efficiency and environmental protection advantages of existing coal-fired units to treat sludge from urban sewage treatment plants, but coal-fired power plants lack Ability to dispose of waste liquid from sludge co-firing process

[0003] High water consumption industries such as thermal power are now required to increase the use of reclaimed water in cities. However, compared with surface water such as reservoir water and river water, reclaimed water has high concentrations of alkalinity, hardness, chloride ions, sulfate radicals, salt content, and organic matter. The use of reclaimed water in power plants generally requires the addition of reclaimed water pretreatment systems and circulating water and sewage desalination systems. In addition, due to the increase in salt brought into the water source, the amount of high-salt wastewater at the end will also increase, which will greatly increase the burden on thermal power companies, which is not conducive to the use of reclaimed water. Promote application

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