Technology Introduction
Landfill leachate is generated by the decomposition of solid waste, and the external water (including rainfall; surface water and underground water). It contains various metabolic substances and water, with high organic content; high concentrations of heavy metal ions; high ammonia-nitrogen; high salt and poor biodegradability.
Based on the features, requirements of processing technology and facility become much higher. The process of "Pre-treatment + MBR (two-stage A/O + UF) + NF + RO" has the advantages of good performance; high stability; strong ability of resistance to impact load; low cost and high performance price ratio.
The quality and quantity of the leachate is adjusted by regulating tank,then enter into the external MBR system after the pre-treatment system to removal suspended particles. The MBR system consists of two parts: two-stage A/O biochemical system and the external tubular ultrafiltration membrane system. The effluent of MBR membrane bio-reactor enter into the depth treatment system,which is composed of NF and RO system; leachate can reach the emission standard after the depth treatment.
Process Flow Chart
The process flow chart of "Pre-treatment + MBR (two-stage A/O + UF) + NF + RO" is as follows:
Treatment Effects
Effluent is stable, ensure to reach diagram 2 in Standards of Municipal Solid Waste Sanitary Landfill Pollution Control (GB16889-2008)
Characteristics and Advantages
High interception rate of large suspended solids.
Two-stage A/O biochemical system has enough reflux ratio, high concentrations of activated sludge and strong ability of resistance to impact load, so as to ensure the removal of organic matter, ammonia-nitrogen and total nitrogen , and finally meet the standard requirements.
MBR could intercept sludge, with the low sludge load, also could increase the concentration of sludge in system and increase the removal rate of organic matter that difficult degradation.
The usage of NF and RO membrane could efficiently intercept the micro-molecule and salts to ensure the effluent reach the standards.
No anaerobic system, so it is no necessary to dispose methane,only deodorization.
Less surplus sludge, convenient operation, low land occupancy.
Application Case
One of the landfill leachate treatment programs in Zhejiang Province
Construction Time: 2014
Nature of The Sewage:landfill leachate of solid waste
Scale:150m3/d
Main Process: Pre-treatment + MBR (two-stage A/O + UF) + NF + RO
Treatment Requirement: table 2 of standards for Pollution Control on the landfill site of Municipal Solid Waste (GB16889-2008)
One of the landfill leachate treatment programs in Zhejiang Province
Construction Time: 2010
Nature of The Sewage:landfill leachate of solid waste
Scale:650m3/d
Main Process: Pre-treatment + MBR (two-stage A/O + UF) + NF + RO
Treatment Requirement: table 2 of standards for Pollution Control on the landfill site of Municipal Solid Waste (GB16889-2008)
