City sludge management equipment and method

Abstract

The invention discloses city sludge management equipment and a method. Firstly a biological preparation with a bactericidal effect is mixed and diluted into a certain amount of water, the diluted bactericide solution is uniformly mixed with a certain amount of aerogel, sludge and a certain amount of the biological preparation with the bactericidal effect are sufficiently mixed for a certain periodof time in a mixing and stirring tank so as to be subjected to sterilization treatment, and ozone or a certain amount of hydrogen peroxide can be injected into the mixing and stirring tank; the biological preparation with the bactericidal effect is adopted to kill harmful active bacteria, the biological preparation has the complexing effect meanwhile to eliminate dissociated harmful metal, afterwards, nontoxic and harmless aerogel containing nano pores is adopted to adsorb the heavy metal ions at the free state, then ultraviolet irradiation is adopted to fully kill the residual bacteria, finally dehydration drying is conducted, a powdery organic solid fertilizer is obtained, and meanwhile, pelletizing and storage transportation can further be conducted simultaneously. The city sludge management equipment has the characteristics that the investment is low, the practicality is high, no secondary pollution is generated, and the waste is comprehensively utilized.

Description

technical field [0001] The invention relates to the technical field of sludge treatment by bioengineering technology, in particular to an urban sludge treatment equipment and method. Background technique [0002] With the development of social economy and urbanization, the generation and quantity of urban sewage are constantly increasing. According to relevant predictions, the amount of urban sewage in my country will increase significantly in the next 20 years, and the sewage discharge in 2010 will reach 4.4×1010m3·d-1. At present, my country's annual output of dry sludge is nearly 3×106t. With the development of domestic sewage treatment business, the total treatment water volume and treatment degree of sewage treatment plants continue to expand and improve, and the amount of sludge produced will also increase day by day. A large amount of sludge has not been treated in a timely and reasonable manner, which has become a heavy burden for sewage treatment plants. [0003] ...

AI Technical Summary

Problems solved by technology

[0007] The sludge wet oxidation method has the disadvantages of high temperature and high pressure, complex equipment, and high operation and maintenance costs; earthworms process sludge and obtain organic fertilizers through earthworm purification, but there are large areas, long processing time, and processed earthworms. Enrichment of heavy metals, membrane bioreactor, purification is relatively thorough, but the clogging of the membrane and the price of membrane materials limit the popularization and application of this method; the basic principle of sludge acidification is to return the excess sludge to the wastewater treatment system after hydrolysis and acidification In order to achieve the purpose of reducing or basically no sludge discharge, this method is in the exploratory stage; the sludge artificial wetland treatment technology is a new technology under research, which cannot be applied on a large scale yet. Sanitary landfill is easy to operate. The investment cost is small, the treatment cost is low, and the adaptability is strong, but its land occupation is serious. If the anti-seepage technology is not enough, it will lead to potential soil pollution and groundwater pollution; sludge incineration requires a large investment in treatment facilities and high treatment costs. Incineration of organic matter will produce toxic substances; sludge throwing into the sea is a simple and economical treatment method. Governments of various countries have introduced policies to stop throwing into the sea to control pollution