Carbon source denitrogenation inside cells for sewage

Abstract

In aerobic condition, soluble organic substance in water can be absorbed by microbe in short time, the organic substance is in microbe cells mainly in way of intracellular polymer and used as anti-nitrocarbon source in anti-nitrify tank. The processing steps are: mixing reaction, solid-liquid separating, nitrify and anti-nitrifying.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for denitrification of carbon sources in sewage cells. Background technique [0002] At the beginning of the last century, with the invention of wastewater biological treatment technology, water pollution control technology has been greatly improved. By the 1970s, the problem of black and odorous water bodies in western developed countries was basically solved, followed by nitrogen pollution. The problem of eutrophication in water bodies is becoming more and more prominent all over the world. Nitrogen is a controlling factor for eutrophication in water bodies of inland rivers and lakes. Since then, denitrification technology has become a research hotspot in the academic and engineering circles of the international environmental protection technology field, and a variety of denitrification technologies have been invented, which are mainly div...

AI Technical Summary

Problems solved by technology

Research and engineering practice show that this method has high and stable denitrification efficiency, but it has the following defects: (1) Carbon sources need to be added to the denitrification tank, the cost of chemicals is high, and the dosage is difficult to control, which may easily cause organic matter Leakage; (2) Due to the need to add chemicals and automatic online monitoring and control, there are many equipments, high operation requirements, complicated management, and high quality requirements for operators; (3) All carbon in the influent water needs to be oxidized into CO 2 and H 2 O, the hydraulic retention time is long, the pool volume is large, the floor area is large, and the infrastructure cost is high; (4) Aeration power consumption is high

It is the anoxic denitrification tank in the front, the aerobic nitrification tank in the back, it uses the organic matter in the influent as the denitrification carbon source, overcomes the defect that the O / A method needs to add chemicals as the denitrification carbon source, but it It also inevitably has the following defects: (1) a large amount of reflux mixture is required to improve the denitrification efficiency, and the reflux ratio is usually required to be 7-8:1, so the energy consumption is large and the operating cost is high; (2) the denitrification efficiency is low; (3) The effluent contains a certain concentration of nitrates. In the secondary settling tank, denitrification may occur, causing the sludge to float up and affecting the quality of the effluent.

Although the fixed growth of microorganisms on the membrane is conducive to the growth of autotrophic nitrifying bacteria with a long generation time, nitrification only occurs under low load conditions, and there are also some defects as follows: (1) The use of fillers greatly increases the investment. (2) Nitrification can only occur under low-load operating conditions, and the pool is large in size and high in cost; (3) The denitrification efficiency is low; (4) Membrane shedding is easy to cause blockage; (5) Water distribution is not easy to be uniform; ( 6) Growth of pond flies, etc.

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