Nitrogen and phosphorus removal method by using pyrite as biochemical filling
A technology for nitrogen and phosphorus removal and pyrite removal, which is applied in the direction of anaerobic digestion treatment, can solve problems such as poor results, and achieve the effects of easy engineering promotion and application, low effluent hardness, and simple operation
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[0032] Example 1: Start-up of the reactor
[0033] The process flow used in the test is as follows figure 1 As shown, the waste water to be treated is located in the water tank 1 and enters the reactor through the peristaltic pump 2, the influent flow is measured by the liquid flow meter 3, and the treated water is discharged from the water outlet 5.
[0034] (1) Reactor packing preparation: Screen pyrite with a particle size of 2-5mm and limestone with a particle size of 1-2mm. According to the mass ratio of 4:1, the bed porosity is about 50%, directly filled into the reaction Device
[0035] (2) In order to start the reactor as soon as possible, the start-up of the reactor is divided into three stages:
[0036] a. First inoculate the anaerobic sludge from the wastewater treatment plant into the reactor, pass the Thiobacillus denitrificans culture solution into the reactor, set the hydraulic retention time to 8h, and regularly detect NO 3 - -N concentration, NO measured for 3 consec...
Example Embodiment
[0042] Example 2: Denitrification and phosphorus removal of artificially prepared domestic sewage
[0043] The experiment was continued on the basis of the start-up of the reactor of Example 1.
[0044] Test water is artificial water distribution, influent NO 3 - -N concentration is 29.52mg / L, TP is 15.37mg / L, pH=7.18, water temperature is 30°C.
[0045] The wastewater to be treated is circulated into the reactor after the start-up. The hydraulic retention time is 5 days, so that the microorganisms and the treated wastewater are fully contacted; water samples are taken every 24 hours to determine the water quality indicators. The results are shown in the table below, effluent NO 3 - -N is less than 1mg / L, NO 2 - -N was not detected; and TP was lower than 0.05mg / L. It can be seen that the treated effluent is better than the first-level discharge standard of pollutant discharge standards for urban sewage treatment plants in my country, and the device operates stably.
[0046] Sampl...
Example Embodiment
[0047] Example 3: Denitrification and phosphorus removal of artificially prepared domestic sewage
[0048] The experiment was continued on the basis of the start-up of the reactor of Example 1.
[0049] Test water is artificial water distribution, influent NO 3 - -N concentration is 30.14mg / L, TP is 14.19mg / L, pH=5.03, water temperature is 20°C.
[0050] The wastewater to be treated is circulated into the reactor after the start-up. The hydraulic retention time is 5 days, so that the microorganisms and the treated wastewater are fully contacted; water samples are taken every 24 hours to determine the water quality indicators. The results are shown in the table below.
[0051] Sampling times
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