Stepped resource and standard reaching discharge method for high-ammonia nitrogen wastewater in environmental protection toilet urine
A resource-based, high-ammonia-nitrogen technology, applied in the field of environmental sanitation, can solve the problems of high proton exchange membranes, non-compliance with the principle of resource cascade utilization, and limited engineering applications, etc., and achieve the effects of simple and controllable operation, narrowing the gap, and promoting ammonia recovery
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example 1
[0034] The present invention is described in further detail in conjunction with accompanying drawing now.
[0035] Firstly, the electrolysis system is assembled, the anode is made of columnar magnesium rod and magnesium alloy material, the cathode is made of graphite rod, the surface area of the anode and the cathode is the same, the distance between the electrodes is set to 1.5cm, and the external circuit is connected; through the DC-POWER The method applies a voltage of 0.8V; the biogas slurry after anaerobic treatment of pig manure is used as the treatment object, and the temperature is 28±3°C. When the power is turned on, a large amount of hydrogen gas is generated at the cathode, and the pH of the solution rises rapidly to 10.0, and ammonia and hydrogen gas are volatilized. Wait for the mixed gas to recover ammonia nitrogen through 3% sulfuric acid absorption, and then absorb 10% lye to further purify hydrogen, and finally obtain hydrogen content as high as 98%. , COD≤6...
example 2
[0045]Human urine contains high nitrogen and phosphorus elements, especially the ammonia nitrogen content of the hydrolyzed urine is as high as 5000-6000mg / L, which is much higher than the phosphorus 300-400mg / L. Example 2 takes the hydrolyzed urine as the processing object , to recover nitrogen and phosphorus, and other operations are consistent with Example 1, but the pH of the urine itself can rise to above 9.0 after hydrolysis, which is more conducive to ammonia volatilization and struvite precipitation. The research results show that the ammonia recovery rate is as high as 90%, but The purity of struvite is only 65%, the purity of hydrogen reaches 98%, and the effluent quality is colorless and odorless, in which ammonia nitrogen≤1mg / L, COD≤50mg / L, total nitrogen≤15mg / L, and total phosphorus≤0.3mg / L.
example 3
[0047] Human urine contains high nitrogen and phosphorus elements, especially the ammonia nitrogen content of the hydrolyzed urine is as high as 5000-6000mg / L, which is far higher than the phosphorus 300-400mg / L. In Example 3, the unhydrolyzed fresh urine is Treat objects and recover nitrogen and phosphorus. During the biohydrolysis of urine, a mixed bacterial solution of functional microbial strains Pseudomonas, Tauerella and Bacillus was added to quickly complete the hydrolysis of urine, and then follow the operation method of Example 1 to recover nitrogen and phosphorus. The research results show that the recovery rate of ammonia is as high as 90%, the purity of struvite is 75%, the purity of hydrogen is 98%, and the effluent quality is colorless and odorless, in which ammonia nitrogen≤0.5mg / L, COD≤50mg / L, total nitrogen≤15mg / L , total phosphorus ≤ 0.5mg / L.
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