Phosphorus release and recovery device for excess sludge

By designing a sludge phosphorus release and phosphorus recovery device with a streamlined structure, using alkali-added cracking and anaerobic phosphorus release methods, the problem of low efficiency of sludge phosphorus release and phosphorus recovery in the prior art is solved, and efficient and low-cost phosphorus resource recovery is achieved.

CN119683831AActive Publication Date: 2025-03-25CHINA MACHINERY INT ENG DESIGN & RES INST
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Patent Information

Application Number
CN202510191776.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-21
Publication Date
2025-03-25
Estimated Expiration
2045-02-21

AI Technical Summary

Technical Problem

The existing sludge phosphorus release and phosphorus recovery technologies have problems such as complex equipment, difficult operation and maintenance, high investment and energy consumption, difficult treatment of foul-odor gases, high drug consumption costs, slow phosphorus release rates, and low phosphorus recovery efficiency, making it difficult to achieve efficient recycling and utilization of phosphorus resources in sludge.

Method used

A residual sludge phosphorus release and phosphorus recovery device with a streamlined structure is designed, including a sludge concentration unit, a sludge cracking component and a sludge dewatering unit. By adding alkali, 10% to 20% of the concentrated sludge is cracked, and the COD released from the cracking explanation is used as a carbon source for anaerobic phosphorus release, so as to achieve low-cost and efficient phosphorus release of the entire residual sludge, and efficient phosphorus recovery is achieved through a special phosphorus recovery mechanism.

Benefits of technology

It realizes efficient phosphorus release and recovery of phosphorus in sludge, reduces equipment investment and operation costs, simplifies the device structure, and improves phosphorus recovery and product purity.

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Abstract

The invention relates to the technical field of water treatment, in particular to an excess sludge phosphorus release and phosphorus recovery device which comprises a phosphorus release mechanism, the phosphorus release mechanism comprises a sludge concentration unit, a sludge breaking assembly and a sludge dewatering unit, and the sludge concentration unit is provided with an excess sludge feeding port, a concentrated sludge discharging port and a supernate discharging port; the sludge cracking assembly comprises a sludge cracking unit and a pH value adjusting unit which are connected in series, and the overall structure is simplified; according to the invention, 10%-20% of the concentrated sludge is subjected to alkali addition cracking, COD (carbon source) released by cracking is used as a carbon source of phosphorus-accumulating microorganisms (phosphorus-accumulating bacteria) in the total residual sludge entering the concentration tank, anaerobic phosphorus release occurs in an anaerobic environment of the sludge concentration unit, an external carbon source is not needed, and the phosphorus-accumulating microorganisms (phosphorus-accumulating bacteria) can be recycled. Through a new scheme of alkali release phosphorus release of a small amount of concentrated sludge and anaerobic biological phosphorus release of total excess sludge, low-cost and high-efficiency phosphorus release of the total excess sludge is realized, and subsequent high-efficiency phosphorus recovery is facilitated.
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