A method for combined treatment and enhanced nitrification phosphorus removal

Abstract

The invention relates to a method for enhancing nitration and phosphorus removal through co-treatment. The method comprises the following steps: carrying out pre-precipitation on concentrated dewatered sludge water, and leading obtained supernate into a bioreactor; adding deep dewatered sludge water to the bioreactor, wherein the added deep dewatered sludge water accounts for 20-50v / v% of the concentrated dewatered sludge water; and removing ammonia nitrogen in sludge water. Compared with the prior art, the concentrated dewatered sludge water and the deep dewatered sludge water are subjected to co-treatment by virtue of a biological treatment system; the alkalinity required for nitrification of two kinds of sludge water is supplemented by the deep dewatered sludge water; phosphorus in the concentrated dewatered sludge water is synchronously removed by using calcium ions in the deep dewatered sludge water; the strong basicity and high-calcium ions of the deep dewatered sludge water are reduced by dilution of the concentrated dewatered sludge water; and an appropriate growth environment is provided for microorganisms for removing COD and ammonia nitrogen.

Description

technical field [0001] The invention belongs to the field of environmental protection sewage sludge treatment, and in particular relates to a combined treatment method for strengthening nitrification and phosphorus removal. Background technique [0002] With the rapid advancement of my country's water environment protection, the national sewage treatment rate and popularization rate have been greatly improved. The sewage treatment business will gradually expand from the existing cities to more than 20,000 towns. The number of sewage treatment plants and the total treatment The volume of water will continue to expand and improve. As of the end of the third quarter of 2013, 3,501 urban sewage treatment plants have been built nationwide, with a sewage treatment capacity of about 147 million cubic meters per day. According to the forecast of the Ministry of Housing and Urban-Rural Development, the country's total sewage treatment capacity will reach at least 175 million cubic me...

AI Technical Summary

Problems solved by technology

Although the flow rate of concentrated dewatered sludge water is relatively small compared with the treatment water volume of sewage treatment plants, the concentration of pollutants contained in it is high. If it is directly returned to the water inlet for further treatment, it will not only cause repeated treatment of pollutants, Moreover, it will increase the pollutant load of the sewage treatment system and cause the deterioration of the effluent quality.

If the concentrated dewatered sludge water is treated, it is necessary to add a large amount of metal salt (iron salt or aluminum salt) to remove phosphorus, and the sludge water has a high concentration of ammonia nitrogen, and its own alkalinity is difficult to meet its nitrification demand, which causes It is difficult to effectively remove ammonia nitrogen and total phosphorus