CN104496059A

CN104496059A - Process for treating sewage produced in edible oil plant

Info

Publication number: CN104496059A
Application number: CN201510000017.1A
Authority: CN
Inventors: 朱旭东
Original assignee: HUNAN DONGXIANG GREASE Co Ltd
Current assignee: Hunan Dongxiang Oil Co., Ltd
Priority date: 2015-01-01
Filing date: 2015-01-01
Publication date: 2015-04-08
Anticipated expiration: 2035-01-01
Also published as: CN104496059B

Abstract

The invention discloses a process for treating sewage produced in an edible oil plant. The process is mainly characterized by comprising the following steps: arranging a hull bran filtering basin and a high-level plant ash filtering basin, filtering oily wastewater in the workshop by virtue of the hull bran filtering basin and the high-level plant ash filtering basin, and pumping the wastewater into a boiler spray dust remover to be utilized, so that the zero emission standard is achieved. The sewage problem in the edible oil plant can be well treated, the environment-friendly requirement is met, the investment and operating cost are low, and the process has the advantage that the cost can be saved by more than 0.4 million yuan in comparison with the conventional anaerobic treatment method.

Description

A kind of edible oil factory production waste treatment process

Technical field

The present invention relates to a kind of sewage treatment process, particularly a kind of edible oil factory production waste treatment process.

Background technology

The waste water handling problem that present edible oil source mill faces is a great problem, and in its waste water, rich nutritive material and oil are difficult to remove with general method, and through active sludge, anaerobism, aerobic, filtration treatment, the high and mud of processing costs discharges nowhere.One piece of worry that current oily factory produces.

Summary of the invention

The object of the present invention is to provide a kind of edible oil factory production waste treatment process, the sewage making edible oil factory produce generation reaches the emission standard of national regulation after this art breading.

Technical scheme of the present invention is: a kind of edible oil factory production waste treatment process, is characterized in that: adopt following methods to process: 1. the oily(waste)water collections such as the washing water of ground water and workshop section of coming unstuck of washing in workshop are entered settling bowl sedimentation about 10 days; 2. skimmed by the sump oil above settling bowl, sewage pump below pumps into shell chaff filtering basin and filters; 3. the filtered water of shell chaff filtering basin bottom is pumped into high-order plant ash filtering basin to filter, the oilcan chaff that contains on top enters boiler combustion again; 4. the filtrate of high-order plant ash filtering basin is sent into collecting tank, the water pump of collecting tank pumps into boiler exhaust gas treatment unit foam dust collector; Process is taken out with the plant ash crossed.

Shell chaff filtering basin of the present invention are 2, and each capacity is 10m ³, be arranged on more than ground, brick, wall is high 2 meters, below brick tank lay stainless Framework Of Steel Reinforcement, thick stainless reinforcing mat, Stainless Steel Cloth respectively upper, spread thin system chaff and the 50cm husk of 50cm on the net respectively.

High-order plant ash filtering basin of the present invention are 2, employing is in about 150 cubic metres, more than ground storage pool and drains pond as plant ash, brick, below brick tank lay stainless Framework Of Steel Reinforcement, thick stainless reinforcing mat, Stainless Steel Cloth and 3721 woven dacrons above respectively.

The present invention can be good at processing the effluent problem of Edible Oil Refinery, meet the requirement of environmental protection, and investment and working cost not high, than saving more than 40 ten thousand yuan conventional anaerobic treatment process year.

Accompanying drawing explanation

Fig. 1 is present invention process schema;

Fig. 2 is shell chaff filtering basin schematic diagram;

Fig. 3 is plant ash filtering basin schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, sewage treatment process of the present invention is further described.

As shown in Figure 1, Figure 2, Figure 3 shows, for 30 tons of/day sewage disposals: oily(waste)water refers to the washing water washing ground water and workshop section etc. of coming unstuck in workshop, according to existing technique, we take whizzer separating technology, adopt an aquation secondary washing process, and using the process water of intermediate water wash water as first time water washing operations, general's first time washing water is as hydration processes water, each addition is 5% of oil mass, then can control to add in hydration degum process that the water yield is oil mass 5%, and all enter in soap stock, soap stock, after recycling, separates out the water of 40%, then workshop produces waste water is 100*5%*40%=2 ton water/sky; Workshop is washed ground water and is smeared the sewage, vacuum cooling sewage etc. that (punching) washes equipment and ground in process of production, every day about 3 tons; The draining of boiler water yield is 1 ton/day, then the total wastewater flow rate in workshop is 6 tons/day.Other, if the pollution-free water such as rainwater, water coolant, hot water are from the outflow factory of rain rill, do not enter sewage lagoon.

settling bowl 30 cubes, can by sewage sedimentation 10 days, as far as possible sump oil in emersion water, and is skimmed by sump oil and be incorporated to contaminated-oil basin, sells as technical oils after precipitation dehydration.

3. shell chaff filtering basin are 2, and each capacity is 10m ³be arranged on more than ground, brick, wall is high 2 meters, brick tank lay stainless Framework Of Steel Reinforcement, thick stainless reinforcing mat, Stainless Steel Cloth respectively upper below, spreads thin system chaff and the 50cm husk of 50cm on the net respectively, is sprayed on by sewage on husk, greasy dirt is trapped, and filtrate pumps into high-order vegetation ashpit and filters.Change another pond after filter residue is full to filter, this pond is continued to drain.

4. high-order plant ash filtering basin.Employing is in the about 150 cubic metres of storage pools in 2, more than ground and drains pond as plant ash, brick, brick tank lay stainless Framework Of Steel Reinforcement, thick stainless reinforcing mat, Stainless Steel Cloth and 3721 woven dacrons above respectively below, the plant ash water mixture of burning in boiler is pumped on it, the particles such as water oozes out from filter cloth etc., plant ash are then trapped.

4. the filtrate that vegetation ashpit oozes out be provided with certain depth collecting tank (being divided into three lattice 50 cubic metres), suction filtering basin after a part of slag precipitation, light assorted water mixture pumps into boiler exhaust gas treatment unit---foam dust collector.After a vegetation ashpit is full clearly, enable another pond, after plant ash drains in this pond, be mixed into scarfing cinder and get on the bus and sell peasant household and add fowl and animal excrement fermentation to and make fertilizer and use.

5. the theoretical evaporated water of boiler exhaust gas.Burning in the boiler exhaust gas process of husk in washing trapping, trapping particle wherein and water-soluble gas, a part of itself also volatilizing because being heated.Full auxiliary steam amount 5 tons/time, thermal oil indirectly heat with heat 1.5 tons of steam heat energy/time.Then boiler steams is 6.5 tons/time.Boiler heat-energy utilization ratio is 65%, reaches 70%, then heat content in tail gas through reclaiming after heat energy: 6.5/0.7*0.3=2.7 ton steam heat energy/time.

Present company is exhaust temperature 130 DEG C after energy recovery, exhaust temperature 70 DEG C after reclaiming heat energy, then can heat release 60 DEG C, 2.7*60/130=1.25 ton/time, namely can volatilize moisture 24*1.25824=30 ton for 24 hours, namely every day volatilizable moisture 30 tons, 6 tons of waste water can only be produced between cars on hand, deficiency volatilization far away needs, and not enough water can other supplement as water coolant etc. by workshop, reach 0 emission standard.

6. the acid-basicity of plant ash.Workshop Production waste water is slightly acidic, pH=5, and wash ground water pH=9, in settling bowl, pH value is between 6 ~ 8, pH value 7.0 ~ 7.5 after washing pot furnace exhaust gas.Moisture plant ash, after draining, does not affect its use value, namely can not destroy the acid base equilibrium of farmers''s crop soil.

7. the greasy dirt amount of plant ash.In workshop, waste water is out after settlement treatment, and sample 100 grams and bake and bank up with earth debris getting 1.5 grams after dehydration through 105 DEG C, then Residual oil dirt 1.5% in waste water, has greasy dirt 5*1.5%*1000=75Kg every day.After shell chaff filters, waste water Residual oil dirt 0.18%, has greasy dirt amount every day: 5*0.18%*1000=9Kg, plant ash filtering basin 150 cubic metres, fill factor 0.75, then can fill plant ash 112.5 cubic metres, two weeks is full of, fill 7.5 cubic metres every day, 9/7.5=1.2Kg/ cubic meter, namely contain greasy dirt 1.2Kg in every cubic metre of plant ash, plant ash 1 cubic metre is executed in every mu of field, namely every mu of ground on average spills greasy dirt 1.2Kg, does not affect soil vegetation growth.

Technic index of the present invention is as follows:

Sampling spot	Settling bowl water port	Shell chaff filtrate	Vegetation ashpit filtrate
				pH	6.5	6.5	6.5
Greasy dirt amount	1.5%	0.08	——

Performance indicator of the present invention is as follows:

Method	Plant ash process	Anaerobic treatment	Remarks
				Treatment capacity (ton/year)	9000	9000	Annual by 300 days, every day 30 tons of waste water meters
Quantity discharged (ton/year)	0	9000	Except sanitary sewage, rainwater, water coolant
				Standard	Weakly alkaline	Up to standard	Reach state three grade emissioning standard
Power consumption (KWH/)	18000	90000	1KWH=0.7 unit
				Human cost (unit/year)	30000	90000
Running cost (unit/year)	25000	12000	Water per ton adds shell chaff 20kg, alkali 10kg, maintenance of equipment etc.
				Solid state fermentation (unit/year)	10000	1000	The expenses such as waste landfills
Facility investment (ten thousand yuan)	40	200
				Interest and depreciation (unit/year)	80000	400000	Interest 10%, depreciation 10%
Expense amounts to (unit/year)	157600	566000	408400 yuan can be saved

Claims

1. an edible oil factory production waste treatment process, is characterized in that: adopt following methods to process: 1. the oily(waste)water collections such as the washing water of ground water and workshop section of coming unstuck of washing in workshop are entered settling bowl sedimentation about 10 days; 2. skimmed by the sump oil above settling bowl, sewage pump below pumps into shell chaff filtering basin and filters; 3. the filtered water of shell chaff filtering basin bottom is pumped into high-order plant ash filtering basin to filter, the oilcan chaff that contains on top enters boiler combustion again; 4. the filtrate of high-order plant ash filtering basin is sent into collecting tank, the water pump of collecting tank pumps into boiler exhaust gas treatment unit foam dust collector; Process is taken out with the plant ash crossed.

2. edible oil factory according to claim 1 production waste treatment process, is characterized in that: described shell chaff filtering basin are 2, and each capacity is 10m ³, be arranged on more than ground, brick, wall is high 2 meters, below brick tank lay stainless Framework Of Steel Reinforcement, thick stainless reinforcing mat, Stainless Steel Cloth respectively upper, spread thin system chaff and the 50cm husk of 50cm on the net respectively.

3. edible oil factory according to claim 1 production waste treatment process, it is characterized in that: described high-order plant ash filtering basin are 2, employing is in about 150 cubic metres, more than ground storage pool and drains pond as plant ash, brick, below brick tank lay stainless Framework Of Steel Reinforcement, thick stainless reinforcing mat, Stainless Steel Cloth and 3721 woven dacrons above respectively.