A kind of breeding wastewater treatment processTechnical field
The present invention relates to a kind for the treatment of process of waste water, particularly relate to a kind for the treatment of process of breeding wastewater.
Background technology
Effective improvement of Stock raising waste, has become one of Three Difficult Issues of puzzlement world environments worker.With regard to its quantity discharged, it is industry and urban life waste discharge amount 2 times that its organism be take quantity discharged that COD is equivalent.More bad, industry and urban life waste effectively administered, and the improvement of China's breeding waste also rest on do not process or simply dealt situation under.
Why aquaculture sewage is difficult to process, and its major cause is in sewage, mainly to contain ight soil urine, wherein organism (COD), ammonia nitrogen (NH3-N) and the concentration of total phosphorus (TP) high, be tens of even hundreds of times of most of industrial sewage and sanitary sewage, its intractability and processing cost are well imagined.
The conventional treatment process of breeding wastewater is anaerobism (biogas) technique+anoxic+aerobic+chemical dephosphorization+oxidation pond at present.Common process, for the COD that effectively degrades, uses the organic carbon in sewage, has strengthened anaerobic treatment, because anaerobic technique is hydrolysis, acidifying, methanogenic process at leading portion.Enough when the anaerobic technique residence time, design is enough reasonable, and a large amount of organic carbons can constantly resolve into CH4, C2h6deng air release out, the range of decrease of COD is greatly improved.Make so a large amount of organic carbons can absorb as biogas energy, the difficulty of the COD of subsequent technique degraded simultaneously significantly reduces.
But the simultaneous aminating reaction of anaerobic process, makes the NH in sewage3-N has increased 20-30%, NH when entering subsequent handling3the treating processes of-N is completed by ammonification (anaerobism) → nitrated (aerobic) → denitrification (anoxic).By this three-step reaction, it is fully decomposed, simultaneously NH3the removal of-N, must have corresponding carbon source as the prerequisite of anti-nitration reaction.Generally C:N is than could effectively carry out denitrification more than 4:1.By the technological design of current breeding wastewater main flow, the water outlet C:N ratio of sewage after anaerobic and aerobic are processed is almost 1:1, realize C:N ratio more than 4:1, needs 400% quantity of reflux.Reflux ratio rises greatly, although to NH3the treatment effect of-N has ensured, but the biochemical section of system is subject to the impact of 4 times of above impact loads, and the effect of each technique unit just cannot effectively be controlled, and thus, the design of technological process processing parameter is controlled difficulty and greatly strengthened.
Summary of the invention
For addressing the above problem, the invention provides a kind of effective solution and remove COD and NH in waste water3the breeding wastewater treatment process of-N contradiction.
The technical solution adopted for the present invention to solve the technical problems is:
A breeding wastewater treatment process, comprises the following steps:
A. by effluent segregation, be wash-down water and waste liquid, and collect respectively;
B. the wash-down water of collecting is processed, made it to reach breeding wastewater emission standard;
C. the waste liquid distributing in steps A is carried out to concentration, and obtain dope and clear liquid;
D. by the concentrated clear liquid recycling obtaining, the concentrated dope obtaining is carried out to fermentative processing;
E. the dope after fermentative processing is made to liquid biological organic fertilizer.
Be further used as the improvement of technical solution of the present invention, adopt 3-way valve to control the shunting of waste water in steps A, while not rinsing cultivation place, 3-way valve is not controlled and is collected waste liquid, and when water rinses, 3-way valve is controlled and collected wash-down water.
Be further used as the improvement of technical solution of the present invention, in step B, wash-down water passes through the processing of baffling type anaerobic reactor and BAF successively, removes the pollutent in wash-down water, completes the carbon elimination of wash-down water, nitrated, denitrogenation, dephosphorization and processes.
Be further used as the improvement of technical solution of the present invention, during fermentative processing in step D, in dope, add organic high phosphorus, high potassium material, middle trace element and microbial preparation.
Beneficial effect of the present invention: first this breeding wastewater treatment process classifies to breeding wastewater, will be containing high density NH3the waste liquid of-N and the shunting of the wash-down water of high COD.After shunting, then process respectively high NH3the waste liquid of-N and the wash-down water of high COD, avoided combination treatment NH3the interactional contradiction of-N and COD, the waste liquid after simultaneously processing is made liquid fertilizer, and for agricultural provides the manure resources of high-quality, wash-down water after treatment, is better than breeding wastewater emission standard, realizes qualified discharge or the middle water reuse of breeding wastewater, not only energy-conservation but also environmental protection.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is embodiment of the present invention schematic flow sheet.
Embodiment
With reference to Fig. 1, of the present invention a kind of breeding wastewater treatment process disclosed, comprise the following steps:
A. by effluent segregation, be wash-down water and waste liquid, and collect respectively;
B. the wash-down water of collecting is processed, made it to reach breeding wastewater emission standard;
C. the waste liquid distributing in steps A is carried out to concentration, and obtain dope and clear liquid;
D. by the concentrated clear liquid recycling obtaining, the concentrated dope obtaining is carried out to fermentative processing;
E. the dope after fermentative processing is made to liquid biological organic fertilizer.
Breeding wastewater main component is animal excrements and feed, and first this breeding wastewater treatment process classifies to breeding wastewater, will be containing high density NH3the waste liquid of-N and the shunting of the wash-down water of high COD.After shunting, then process respectively high NH3the waste liquid of-N and the wash-down water of high COD, avoided combination treatment NH3the interactional contradiction of-N and COD, the waste liquid after simultaneously processing is made liquid fertilizer, and for agricultural provides the manure resources of high-quality, wash-down water after treatment, is better than breeding wastewater emission standard, realizes qualified discharge or the middle water reuse of breeding wastewater, not only energy-conservation but also environmental protection.
As the preferred embodiment of the present invention, in steps A, adopt 3-way valve to control the shunting of waste water, while not rinsing cultivation place, 3-way valve is not controlled and is collected waste liquid, and when water rinses, 3-way valve is controlled and is collected wash-down water.
For the cleaning of cultivation waste liquid, while not rinsing cultivation place, 3-way valve is not controlled waste liquid and is imported waste collection pond, and while rinsing cleaning, 3-way valve is controlled wash-down water and imported wash-down water collecting tank, completes high NH3the shunting of the waste liquid of-N and the wash-down water of high COD.
As the preferred embodiment of the present invention, in step B, wash-down water passes through the processing of baffling type anaerobic reactor and BAF successively, removes the pollutent in wash-down water, completes the carbon elimination of wash-down water, nitrated, denitrogenation, dephosphorization and processes.
In baffling type anaerobic reactor, realize hydrolysis, acidifying, the methanogenic process of wash-down water.Enough when the anaerobic technique residence time, a large amount of organic carbons can constantly resolve into CH4, C2h6deng air release out, the range of decrease of COD is greatly improved, a large amount of organic carbons can be absorbed as biogas energy, the difficulty of the COD of subsequent technique degraded simultaneously significantly reduces, anaerobic reactor is in the methanogenic process of acidication, for the aminating reaction of while output provides nitrification and denitrification condition, make NH in reactor water outlet3-N obviously declines, and by BAF, is further removed and comprises SS, COD, BOD, NH3-N, TP, complete the carbon elimination of wash-down water, nitrated, denitrogenation, dephosphorization and process.
As the preferred embodiment of the present invention, during fermentative processing in step D, in dope, add organic high phosphorus, high potassium material, middle trace element and microbial preparation.
Fermentative processing is mainly for NH in dope3the processing of-N, NH3the treating processes of-N is completed by ammonification (anaerobism) → nitrated (aerobic) → denitrification (anoxic), during processing, in dope, add organic high phosphorus, high potassium material, middle trace element and microbial preparation, guarantee that fermentation carries out smoothly, and obtain the liquid biological fertilizer of high-quality, high quality, the biological insect protected of tool, diseases prevention.
Certainly, the invention is not limited to above-mentioned embodiment, those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and the modification that these are equal to or replacement are all included in the application's claim limited range.