Device and method for realization of partially denitrified synchronous autotrophic nitrogen removal by sludge fermentation coupled denitrification

Abstract

The invention discloses a device and a method for realization of partially denitrified synchronous autotrophic nitrogen removal by sludge fermentation coupled denitrification, and belongs to the technical field of water treatment; the device comprises a sludge hydrolysis acidification reactor, a sludge dewatering machine, a fermentation liquid reserve tank, a raw water tank and a partially denitrified synchronous autotrophic nitrogen removal reactor; the denitrification method is as follows: putting sludge into the sludge hydrolysis acidification reactor for anaerobic hydrolysis acidification, then sending a sludge water mixed liquid into the sludge dewatering machine, sending a dewatered fermentation liquid into the fermentation liquid reserve tank, pumping nitrate wastewater in the raw water tank into the partially denitrified synchronous anaerobic ammonia oxidation reactor, meanwhile pumping the fermentation liquid into the reactor for a denitrified synchronous anaerobic ammonia oxidation reaction, when a pH curve displayed in a control system is no longer risen and an ORP (oxidation-reduction potential) curve is no longer dropt, discharging a supernatant with a volume of 1 / 2-2 / 3 of the effective volume of the reactor. The device and the method save the processing cost, and are simple in operation, the system effluent TN (total nitrogen) is less than 5mg / L, and deep nitrogen removal efficiency can be achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, relates to a sewage denitrification device, and also relates to a sewage treatment method using such a device. Background technique [0002] With the rapid development of the economy, the discharge of sewage is also increasing. Excessive nitrogen and phosphorus in water will lead to a series of environmental problems such as eutrophication, which will seriously affect daily life and water environment. The stricter discharge standards of nitrogen and phosphorus in water It is the development trend of various countries today. Biological denitrification of sewage is currently the most widely used sewage treatment technology. Its principle is to form an aerobic and anoxic environment in time or space, and carry out nitrification and denitrification to achieve nitrogen removal. Sufficient carbon source is an important factor to ensure its treatment effect. In the case of insufficient carbon s...

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Problems solved by technology

The traditional method is through the formation of struvite (MgNH 4 PO 4 ·6H 2 O, that is, MAP), to remove nitrogen and phosphorus at the same time, but struvite is easy to cause blockage of the pipeline, and an additional Mg source is required. The formation process has certain requirements for the ratio of magnesium, ammonia nitrogen, and phosphorus, and is affected by environmental factors such as The pH value and other influences are relatively large, which increases the complexity of the process

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