CN1120025A

CN1120025A - Method for simultaneously processing kitchen waste water and new refuse

Info

Publication number: CN1120025A
Application number: CN95109611A
Authority: CN
Inventors: 平根健
Original assignee: Daiwa Industry Co Ltd
Current assignee: Daiwa Industry Co Ltd
Priority date: 1994-07-27
Filing date: 1995-07-26
Publication date: 1996-04-10
Anticipated expiration: 2015-07-26
Also published as: JP3095952B2; CN1072614C; JPH0839100A

Abstract

The invention provides a method which can disposal the waste water and fresh garbage in the kitchen at the same time, which not only carries out a purification disposal to the waste water in the kitchen and effectively achieves the reduction of fresh garbage but also reuses the organic matters in the fresh garbage and the waste water at the same time. Through the process that the wast water and the fresh garbage which are generated in the kitchen are mixed, stored and processed through anaerobic fermentation, and mainly the solid organic matters are decomposed and liquefied, and the process that the solid organic matters and the solubility ingredient are decomposed in a floating filter layer which is used for anaerobic treatment and filled with floating filter material and are at the same time with the flotation and separation of the oil ingredient carried out through coarse graining, and the process that in a floating filter layer which is used for aerobic treatment and filled with floating filter material, the solubility ingredient is decomposed and goes through denitrification and dephosphorization at the same time, the waste water and the fresh garbage are continuously processed; the reduction of fresh garbage is achieved and meanwhile the waste water is purified.

Description

Treatment process in the time of kitchen waste water and new refuse

Waste water and the new refuse that the present invention relates to discharge in the kitchen with general family mixes, carries out simultaneously the method for purifying treatment.

Now, kitchen waste water and new refuse has been processed into one of extremely important problem in the environment protection.Except that the complete area of a part of water drain, kitchen waste water has become the maximum reason of river pollution.During although the merging purification tank is constantly being popularized, but on handling its restriction is arranged, when particularly containing a large amount of oil content in the waste water, because of difficult management can't successfully be carried out purifying treatment, a lot of occasions can not reach the water quality standard of BOD (biochemical oxygen demand) 30mg/l.

New refuse or be embedded in underground or by burning disposal but bury and put lack of space, the burning disposal handled and also need a lot funds in addition.And the carbonic acid gas of being emitted during burning disposal becomes the reason of global warming, and nitrogen oxide also promotes the destruction of ozonosphere.

Previous treatment process is because exist organic utilization of being contained in as above shortcoming, new refuse and the waste water again to be difficult to reach.The present invention is provided with for the shortcoming that solves this prior art, its main purpose provides can be when carrying out purifying treatment and reaching the minimizing of new refuse effectively to kitchen waste water, treatment process in the time of kitchen waste water that can utilize again the organism that is contained in new refuse and the waste water and new refuse.

The present invention; have the waste water that to produce in the kitchen and new refuse and mix and store by providing; by anaerobic fermentation mainly to solid shape organism decompose liquefaction processing process and; filling the anaerobism of floating filtering material and is handled with in the filtering layer that swims; oil component obtain by coarse floating isolating make simultaneously process that solid shape organism and solvability composition obtain decomposing and; in the aerobism that floating filtering material in filling is handled with the filtering layer that swims; when the solvability composition obtains decomposing, carry out the process of denitrogenation dephosphorization, last note waste water and new refuse are handled continuously; treatment process achieves the above object when purifying to the kitchen waste water of feature and new refuse to above-mentioned waste water when above-mentioned new refuse obtains minimizing.

According to present method, stir new refuse with kitchen waste water and can promote the solid organic anaerobic fermentation of shape, make its major part obtain decomposition to liquefy.For the activity that promotes Anaerobic Bacteria remains on more than 10 ℃ temperature, preferred 20-30 ℃, and when using water heater the kitchen waste water temperature than higher, can promote anaerobic fermentation greatly.Therefore, mix the energy that need not specially to increase intensification usefulness with the kitchen waste water of warm water and just can be maintained to suitable temperature.

Processed former water is in flowing through the filtering layer that swims that is filled in floating filtering material the time, and the oil droplet that is contained in the former water presents coarse on oil loving floating filtering material surface, so can obtain reclaiming after separating by floating going up.Biological treatment is difficult to decompose oil component, with singly be prolong residence time when handling compare, this physical property separation method is more effective.The oil component that reclaims boils mixing energy and makes soap and utilize by adding caustic soda.

In addition, thus when the composition beyond the oil component is handled, makes residual solid shape organism further to be decomposed liquefaction by anaerobism when flowing through the floating filtering material gap, the solvability composition also is decomposed and lowered organic concentration.At last, flow through the floating filtering material gap of aerobism environment, when the solvability composition is reduced by aerobism decomposition, BOD and COD (chemical oxygen demand), can carry out denitrogenation and dephosphorization.

Below, be applicable to embodiments of the invention by the accompanying drawing detailed description.

Fig. 1 represents the example according to the device of the treatment process of the embodiment of the invention.Decompose by anaerobism by mainly new refuse being carried out for this treatment unit, the 1st groove 1 of liquefaction processing and carrying out the 2nd groove 2 that anaerobism handles simultaneously and carrying out that aerobism is handled and the 3rd groove 3 of denitrogenation dephosphorization treatment constitutes oil content is isolating.

At first, the waste water of being discharged by the kitchen flows into the 1st groove 1 from waste water inflow pipe 4, mixes with the new refuse that drops into.The 1st groove 1 decomposes and to make airtight construction, its capacity according to the new refuse amount of discharging and have or not water heater etc. to set for carrying out anaerobism, and is general minimum for can hold the quantity of refuse of being discharged in 10-15 days.For waste water and new refuse are mixed equably, waste water inflow pipe 4 extends to the bottom near the 1st groove 1 always.

When the mixed solution of new refuse and waste water stored in the 1st groove 1, organic components was decomposed by the anaerobic fermentation of Anaerobic Bacteria, simultaneously by nitrated denitrogenation.At this moment gases such as carbonic acid gas that is produced and nitrogen are arranged to atmosphere by gas discharge outlet 5.The kitchen use under the situation of water heater since wastewater temperature than higher, promoted the anaerobism decomposition.New refuse drops into as pulverizing the back with pulverizer, can mix with waste water equably to promote to decompose.

Like this, after the organic major part of solid shape that the 1st groove is 1 li is liquefied, delivered to 2 li of the 2nd grooves at leisure by the connecting piece 6 that is arranged on groove top, the spout place is that the outflow that prevents bigger solid substance is provided with wire netting 7.

The mixed solution that is sent to the 2nd groove 2 is here handled by anaerobism once more.The same with the 1st groove 1, the 2nd groove 2 also is for keeping anaerobism to make airtight construction.Its capacity is set at and guarantees that 5-12 hours residence time is arranged.Run off from the undersurface middle part of the 2nd groove 2 to filter material and to prevent with being formed with the filtering layer 10 that swims by the floating filtering material 9 of filling till 8.Floating filtering material 9 be the surface with membranaceous paying propagation have microorganism the expanded plastic particle, can swim in filtering layer.Solid shape organism that floating filtering material 9 is captured and solvability composition are by its surperficial microbiological degradation.

Be directed to the mixed solution on top of the 2nd groove 2 and tiny solid shape organism and flow through the filtering layer 10 that swims in downward inflow mode together.At 10 li of the filtering layers that swim, at first the coarse of oil droplet taken place in upper layer part, oil component come-up and formed oil reservoir 11.Then carry out the anaerobism of solid shape organism and solvability composition decomposes in the middle and lower part of the filtering layer 10 that swims.At this moment, nitrated, denitrogenation is also carried out simultaneously.The promoting agent that swims in the emulsified clean-out system of middle level portion of filtering layer 10 has been increased viscosity by anaerobic fermentation, helps the organic sorption of solid shape and decomposes.Decompose by anaerobism gases such as the carbonic acid gas produced and nitrogen by gas discharge outlet 12 rows to atmosphere.

Like this, be sent to the 3rd groove 3 at mixed solution processed in the 2nd groove by near the pipe connecting the bottom that is arranged on groove 13.This top of carrying out the 3rd groove 3 of aerobism processing opens at atmosphere, capacity is set at and guarantees that 2-10 hours residence time is arranged.2 the same with the 2nd groove, running off from the middle part of the 3rd groove 3 above-below directions to filtering material is formed with the filtering layer 15 that swims by filling floating filtering material 9 till preventing to be with 14.The diapire direction of filtering layer 15 of swimming is provided with the induction pipe 16 of aeration with shower nozzle 16a.

Flow into this 3rd groove the bottom contain the residual solid organic mixed solution of shape of minute quantity and together from the bubble of shower nozzle 16a ejection, flow through the filtering layer 15 of swimming with stream mode upwards and decomposed by aerobism, simultaneously at 12 li not itrated ammonium salt nitrogen of the 12nd groove by further nitrated denitrogenation.The mixed solution of sending here from the 2nd groove 2 because of anaerobic fermentation sometimes pH can drop to about 4.5, at this moment preferably carry out pH and adjust it is adjusted in the scope (about pH7) that is fit to the aerobism bacterial multiplication.

Pile up on the bottom of the 1st groove 1 and the 2nd groove 2 undecomposed bed mud 1718 is arranged.Placing like this and also can carry out the anaerobism decomposition, taking out by bed

mud relief outlet

19,20 and also can make compost.

According to treatment process as above, the standard waste water that will discharge in 3 children's of 2 adults the 5 people families and the new refuse of about 500gr/ day are handled simultaneously, have reached good result as shown in table 1.Wherein, the 1st groove 1 usefulness cylindrical container, the 2nd groove 2 and the 3rd groove 3 of diameter 1m, height 1.2m used the inner filtering layer that swims that thickness is 50cm, the cylindrical container of diameter 35cm, height 1.2m of all being provided with.In addition, the new refuse of input has passed through pulverization process in advance.

Table 1

(unit: mg/1)

	Former water	Treating water
	Former water	Treating water	The normal hexane index	????1,860	??????32
?BOD	????4,820	??????420	The normal hexane index	????1,860	??????32
?BOD	????4,820	??????420	?COD	????1,840	??????98
?SS	????5,360	??????96	?COD	????1,840	??????98
?SS	????5,360	??????96	?T—N	????162	??????21.6
?T—P	????10.4	??????3.68	?T—N	????162	??????21.6
?T—P	????10.4	??????3.68	?pH	????6.5	??????4.5

Normal hexane index shown in the table 1 mainly is that the vegetables oil used of fried prawn, the BOD of its waste oil can reach 1,000,000 mg/l usually.In this experiment, 98% oil component is removed, and wherein major part is removed by floating upward the recovery.List can illustrate that also this treatment process has huge contribution for utilizing again of environment protection and oil component from this aspect.

The rate of removing of BOD and COD has all surpassed 90%, remaining the utilized rivers and creeks or the natural purification of lakes and marhshes.In addition, BOD remove the relatively low reason of rate be concentrate 12 li of the 12nd grooves carried out organicly decomposing simultaneously, aerobism bacterium that pH has been reduced to 3 li of the 4.5, the 3rd grooves fails to play a role fully.Therefore after adjusting pH with NaOH, the BOD for the treatment of water dropped to below the 100mg/l.

When the same aerobism treatment trough of 1 and the 3rd groove 3 is set simultaneously as the 4th groove again, the BOD for the treatment of water dropped to below the 5mg/l.By the treating water of the 3rd groove 3 being sent back to the 1st groove 1, T-N (full nitrogen) has dropped to below the 15mg/l in addition, in addition, has obtained stable result when handling continuously.

Therefore, in the time of kitchen waste water of the present invention and new refuse treatment process not only make carry out kitchen waste water and becoming one of the simultaneously treated treatment unit of new refuse, also the mixing by kitchen waste water and new refuse has promoted the organism decomposition, improved processing efficiency, on relatively small-sized treatment unit, reached the water quality standard value of BOD30mg/l.As the aerobism decomposer being strengthened or appends 1 same aerobism treatment trough the aerobism processing is fully carried out in addition, can be reduced to BOD below the 5mg/l.

The major part of the oil component of separated recovery can be made soap and utilize.In addition the undecomposed bed mud that is deposited in the groove is taken out the fertilizer that is used as the trees showy flowers of herbaceous plants, can carry out organic utilization again.And, can remove nitrogen and phosphorus by while denitrogenation and dephosphorization as the supernutrition reason.The simple declaration of accompanying drawing

Fig. explanation 1 the 1st groove 2 the 2nd groove 3 the 3rd groove 4 waste water inflow pipes 5 exhaust outlets 6 tube connectors 7 wire nettings 8 filtering materials of 1 represents to implement the mode chart of the treatment unit example for the treatment of process of the present invention. symbol run off and to prevent from being with 9 floating filtering materials 10 filter course 11 oil reservoirs 12 exhaust outlets 13 tube connectors 14 filtering materials that swim to run off and prevent from being with the 15 filter course 16 snorkel 16a shower nozzles 1718 bed muds 1920 bed mud outlets that swim

Claims

1. treatment process kitchen waste water and new refuse the time; it is characterized in that; this method has and waste water and the new refuse mixing that produces in the kitchen can be stored; by anaerobically fermenting to solid-state organism decompose liquefaction processing process and; anaerobic treatment that floating filtering material in filling with the filtering layer that swims in; floated the isolating while at oil component by coarse; Gu the process that shape organism and solvability composition are decomposed reaches; aerobic treatment that the supernatant liquid filtering material in filling with the filtering layer that swims in; when being decomposed, the solvability composition carries out the process of denitrogenation dephosphorization; can handle continuously above-mentioned waste water and new refuse, when above-mentioned new refuse obtains minimizing, above-mentioned waste water be purified.