DL/T 1939-2018 in English
VALIDTechnical specification for leachate treatment of waste-to-energy plant
- Issued on:2018-12-25
- Implemented on:2019-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$185.00
Introduction
Analysis of the core content of the standard
DL/T1939-2018 is my country's first technical standard specifically for the treatment of leachate from waste-to-energy plants. It systematically specifies the technical requirements for the entire process from regulating tank to reverse osmosis. The standard highlights the following technical features:
- Innovatively proposes a regional difference coefficient (10-30% in South China, 15-30% in North China)
- Clearly defines the hierarchical control of MBR membrane flux (6-12L/(h·㎡) for submerged type, 60-70L/(h·㎡) for external type)
- Establishes a three-stage process combination benchmark (pretreatment + anaerobic + MBR + deep treatment)
Comparative Analysis of Key Processes
| Process Unit | Control Parameters | Core Equipment | Efficiency Index |
|---|---|---|---|
| Anaerobic Treatment | Temperature 30-38℃, volumetric load 5-15kgCOD/(m³·d) | UASB/IC reactor | COD removal rate ≥60% |
| MBR system | DO 1-3mg/L, sludge concentration 8-12g/L | Submerged ultrafiltration membrane | Ammonia nitrogen removal rate ≥95% |
| Advanced treatment | NF flux ≤14L/(h·㎡), RO flux ≤12L/(h·㎡) | DTRO/STRO | Desalination rate ≥ 98% |
Typical water treatment case
Take a 1500t/d waste-to-energy plant in East China as an example, adopting the IC+MBR+DTRO combined process:
- The influent COD of 65000mg/L is reduced to 15000mg/L through the IC reactor
- The MBR effluent COD is stabilized below 800mg/L
- The final DTRO product water COD is ≤60mg/L, meeting the standard in Table 2 of GB16889
Critical Control Points: The equalization tank is maintained at a negative pressure of -50Pa, the anaerobic system is maintained at a positive pressure of 2000Pa, and the MBR membrane group is regularly chemically cleaned for ≤3 months
Implementation Suggestions
Key Points of Operation and Management
- Establish a three-level inspection system (shift inspection, daily inspection, special inspection)
- Configure online water quality analyzers (COD, NH3-N, flow meter)
- Implement redundancy design for key equipment (membrane group, water pump, aeration system)
Safety Prevention and Control Measures
- Configure explosion-proof electrical appliances in explosion-hazardous areas in accordance with GB50058
- The installation distance between methane detection alarms is ≤15m
- A negative pressure collection system is installed in the sludge dewatering room.
Technological evolution trend
Comparing the project data before and after 2010, the technological development shows three major characteristics:
- The treatment process has shifted from single AO to a combined process (IC+MBR+NF)
- The emission standard has been upgraded from GB16889-2008 to Surface Water Level IV
- The treatment of concentrated liquid has shifted from backspray to evaporation and crystallization with zero emission
In the future, the focus will be on the development of high-efficiency anaerobic bacteria cultivation and membrane fouling control technology
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