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Separation technology of food residue and waste oil

Harmless treatment of food waste
Aiming at the comprehensive treatment of food waste, Tsinghua University put forward the methods of harmless treatment and resource utilization of food waste. Food waste contains a certain amount of oil and high protein. Effective recovery of oil and protein is the key to improve the economy and sustainable operation of food waste comprehensive treatment.
As the backbone enterprise of separation machinery industry, the director unit of separation machinery industry association and the member unit of Separation Machinery Standardization Technical Committee, Suzhou younate Machinery Manufacturing Co., Ltd. has a strong influence in the field of solid-liquid separation technology. Ws kitchen waste oil-water separator and separation system is a high-efficiency separation device specially developed for the new process of harmless comprehensive utilization of kitchen waste by hydrothermal method proposed by Tsinghua University, which truly realizes separation and creates value.

Separation process of food waste
After coarse screening, comminution and wet heating, the cooking stuff enters WS oil-water separator. Under the action of centrifugal force field, the slurry is centrifugally settled quickly and is divided into three layers: oil phase, water phase and sediment. After separation, the three kinds of materials are discharged from their respective special channels. The well-designed discharge channel and discharge method can effectively prevent the oil phase from seeping into the water phase and sediment, and the oil in the kitchen waste can be recovered to the maximum extent.

Process features:
①、 Simple process, high efficiency and energy saving:
The traditional process uses two-phase solid-liquid separation to remove the liquid phase of solid coarse slag, and then realize the separation of oil and water through the disc separator. The secondary centrifugal separation of liquid phase consumes a lot of energy, and the fine slag in the liquid phase is easy to block the disc separator, so it needs frequent disassembly and washing, and the labor intensity is high. Ws oil-water separator is suitable for high concentration, single-stage separation can achieve oil / water / slag three-phase separation, complete oil recovery. If the quality of oil is higher, the oil can be further purified, the total amount of oil can be greatly reduced, and the equipment investment and operation cost of secondary separation can be reduced.
②、 Clean and civilized continuous production:
The separator is automatic and continuous from feeding to discharging. The whole separation process realizes leak free and closed operation, which ensures the clean production environment and realizes automatic control, meeting the requirements of modern civilized production.
③、 Advanced technology guarantees benefits:
The advanced separation technology ensures the separation efficiency and stability of separation effect of the separator, realizes the maximum recovery of oil and obtains good economic benefits.
④、 Well designed, reliable and durable:
Fully considering the complexity of kitchen waste separation process, the high temperature resistance of separator seal, wear resistance of slag discharge mechanism and automatic control are carefully designed. The reliability and stability of the separator are ensured.
⑤、 Integrated optimization of separation system
The whole separation system can be integrated design according to the process requirements, from the feed, separation (single stage separation or secondary separation), the transfer of the separated material after separation, the supporting and control of the separator, feed pump and auxiliary device, etc. after optimization design, the system performance can be exerted as much as possible.

Separation process of waste oil

Main technical parameters of three phase centrifuge in separation system

model	Maximum separation factor （G）	stand-alone processing capacity （m³/h）	Allowable feed concentration （%）	Allowable feed particle size (mm)	After separation Oil purity (%)	After separation Slag dryness （％）	electric machinery Total power （kW）
WS2	4000	0.5～1.5	≤5	≤5	≥99	≥22	10.5～13
WS3	3400	3～6	≤10	≤10	≥95	≥22	25～29.5
WS4	3000	6～10	≤10	≤10	≥95	≥22	37.5～48
WS5	3000	10～15	≤10	≤10	≥95	≥22	48～63.5
WS6	3000	18～25	≤10	≤10	≥95	≥22	72.5～105
remarks	1. The processing capacity of single machine and the total power of motor are determined according to the feed concentration; 2. The purity of separated oil and the dryness of slag are related to the composition of feed; 3. If the feed concentration and the size of the feed particles exceed the above range, please explain when ordering, and non-standard design can be carried out; 4. WS2 is mainly used for low concentration materials or secondary purification and separation of the first stage oil.

Introduction of biogas residue dehydration technology
Separation process I
There is no need to add chemicals to concentrate biogas residue, which is sold as a kind of bacteria.
W series two-phase thickener is a centrifugal separator specially developed for the concentration and dehydration of biogas residue without chemicals. It has been successfully applied in the production of organic fertilizer from palm oil biogas residue; Concentration of kitchen residue and recovery of bacteria; Cellulose ether wastewater treatment, living bacteria recovery, etc.

Separation process 2
The flocculant is added, the single machine treatment capacity is large, and the biogas residue is used as composting raw material.
By adjusting the structure and operation parameters of W series centrifuges, the centrifugal dehydration of biogas residue with flocculant can be completed. The separation efficiency is high and the single machine processing capacity is large.