Process for separating nitrates, COD salts and sulfates by evaporating wastewater containing nitrates, COD salts and sulfates
A technology of nitrate and salt nitrate, which is applied in the field of evaporation and separation of nitrate COD salt nitrate wastewater containing nitrate COD salt nitrate, can solve the complex process flow of the wastewater pretreatment system, the large consumption of refrigeration equipment and cold energy, and the energy consumption of refrigeration Dashi water Glauber's salt and other problems, to achieve the effect of strong adaptability of raw materials, low TOC, high yield of salt salt
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[0034] Example 1 (nitrate brine): take 200m 3 Salt nitrate wastewater (NaCl 5.29g / l, Na 2 SO 4 39.91g / l, CaSO 4 0.007g / l, MgSO 4 0.006g / l, COD corresponds to reducing substances 0.058g / l, NaNO 3 0.20g / l) as the raw material, the 200m 3 Evaporation of salt and nitrate wastewater (evaporation temperature 100℃) to concentrate fresh water and 25.46m 3 Concentrate (NaCl 46.5g / l, Na 2 SO 4 313.5g / l, CaSO 4 0.055g / l, MgSO 4 0.047g / l, COD corresponds to reducing substances 0.458g / l, NaNO 3 1.579g / l); the 25.46m 3 Concentrate (NaCl 46.5g / l, Na 2 SO 4 313.5g / l, CaSO 4 0.055g / l, MgSO 4 0.047g / l, COD corresponds to reducing substances 0.458g / l, NaNO 3 1.579g / l) and 16.81m 3 Circulating mother liquor for salt making (NaCl290.5g / l, Na 2 SO 4 64.5g / l, CaSO 4 0.11g / l, MgSO 4 0.094g / l, COD corresponding to reducing substances 3.03g / l, NaNO 3 10.452g / l) mixed evaporation (evaporation temperature 100℃) to obtain 7.879 tons of nitrate, fresh water and 23.57m 3 Salt nitrate saturated solut...
Example Embodiment
[0035] Example 2 (nitrate brine): take 200m 3 Salt nitrate wastewater (NaCl 20.55g / l, Na 2 SO 4 20.80g / l, COD corresponding reducing substance 0.206g / l) as raw materials, the 200m 3 Evaporation of salt and nitrate wastewater (evaporation temperature 100℃) to concentrate fresh water and 22.91m 3 Concentrate (NaCl 179.40g / l, Na 2 SO 4 181.58g / l, COD corresponds to 1.799g / l of reducing substances); the 22.91m 3 Concentrate (NaCl 179.40g / l, Na 2 SO 4 181.58g / l, COD corresponds to 1.799g / l of reducing substances) and 56.67m 3 Circulating mother liquor for salt making (NaCl 290.5g / l, Na 2 SO 4 64.5g / l, COD corresponds to 3.175g / l of reducing substances) Mixed evaporation (evaporation temperature 100℃) to obtain 4.145 tons of nitrate, fresh water and 79.47m 3 Salt nitrate saturated solution (NaCl 308g / l, Na 2 SO 4 55g / l, COD corresponds to reducing substance 3.175g / l); the 79.47m 3 Salt nitrate saturated solution (NaCl 308g / l, Na 2 SO 4 55g / l, COD corresponds to 3.175g / l of reducing ...
Example Embodiment
[0036] Example 3 (salt salt type brine): take 200m 3 Salt nitrate wastewater (NaCl 39.91g / l, Na 2 SO 4 5.92g / l, CaSO 4 0.007g / l, MgSO 4 0.006g / l, COD corresponds to reducing substances 0.058g / l, NaNO 3 0.20g / l) as the raw material, the 200m 3 Evaporation of salt and nitrate wastewater (evaporation temperature 100℃) to concentrate fresh water and 25.46m 3 Concentrate (NaCl 313.5g / l, Na 2 SO 4 46.5g / l, CaSO 4 0.055g / l, MgSO 4 0.047g / l, COD corresponds to reducing substances 0.458g / l, NaNO 3 1.579g / l); the 25.46m 3 Concentrate (NaCl 313.5g / l, Na 2 SO 4 46.5g / l, CaSO 4 0.055g / l, MgSO 4 0.047g / l, COD corresponds to reducing substances 0.458g / l, NaNO 3 1.579g / l) and 93.78m 3 Nitrate production cycle mother liquor (NaCl305g / l, Na 2 SO 4 55g / l, CaSO 4 0.11g / l, MgSO 4 0.094g / l, COD corresponding to reducing substances 3.03g / l, NaNO 3 10.452g / l) mixed evaporation (evaporation temperature 55℃) to obtain 7.815 tons of salt, fresh water and 119.99m 3 Salt nitrate saturated solution ...
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