Case
Xi’an sewage treatment plant sludge centralized disposal project
Project profile：
Raw materials and capacity: sewage sludge, 1000 tons/day (with 20% of solid content)
Biogas production: 45,000 Nm3 / day
Biogas use: CHP
Purac supply scope: anaerobic system
The capacity of Xi’an sewage treatment plant sludge centralized disposal project is up to 1000 tons/day (with 20% solid content), using THP + anaerobic + drying treatment process route. The sludge is first sent into the THP unit, and then into the ANAMET anaerobic system of PURAC for digestion treatment.
The anaerobic system, mainly composed of 4 digesters with single volume of 11000m3, has been in stable operation, which can meet nearly more than half of the sludge treatment demand in the main urban areas of Xi 'an, and produce 45,000 Nm3 of biogas per day for power generation.
After digestion, digestate is dewatered by decanter centrifuge, and then sludge cake is treated by low temperature drying, and the amount of final product is 240 tons, which can be used as building materials, raw materials, landscaping fertilizer, etc., to achieve green, circular and sustainable development.
Effect:
Xi’an sewage treatment plant sludge centralized disposal project is a key project for Xi 'an urban environmental infrastructure construction, which is an important measure to solve the predicament of Xi 'an sludge disposal, is the livelihood project highly valued by the leaders of the provincial and municipal governments and of concern to various sectors of society, is also the opening work of the construction of sludge disposal facilities in Xi'an.
As a key project of Xi 'an urban environmental infrastructure construction, the sludge is thoroughly treated by the process of "THP + anaerobic digestion + dewatering by decanter centrifuge + low temperature drying". The final products after treatment can meet the requirements of "stabilization, harmlessness and recycling", and can be used as building materials and garden greening fertilizer, etc., to achieve green, circular and sustainable development, and play a demonstration role in the national promotion of sludge anaerobic digestion treatment route.
