Method for treating phosphorus-containing wastewater by using desulfurization wastewater sludge

• Main Authors: ZHOU ZHEN, NIU TIANHAO, SHEN XUELIAN, HUANG RONGWEI, YE JIONGJIONG, DOU WEIXIAO
• Format: Patent
• Language: English
• Published: 13.01.2016
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a method for treating phosphorus-containing wastewater by using desulfurization wastewater sludge. The method includes the following steps: step S1, carrying out precipitation, coagulation and sedimentation treatment on desulfurization wastewater, and generating the desulfurization wastewater sludge; step S2, separating the desulfurization wastewater sludge from a liquid phase, and dehydrating; step S3, adding the desulfurization wastewater sludge after dehydration into the phosphorus-containing wastewater; and step S4, stirring the wastewater after mixing, allowing to stand and layer, and allowing the supernatant to be effluent and discharged. With use of the characteristic that the desulfurization wastewater sludge mostly comprises Ca<2+> insoluble substances and colloid materials, phosphorus of the high-concentration phosphorus-containing wastewater is efficiently removed, the waste is used for treating the waste, a large amount of cost is saved, and waste recycling increases the output value. In addition, heavy metals in the desulfurization wastewater after sulfide precipitation form precipitates extremely difficult to dissolve, the stability is good, the release quantity to water is extremely low in the process of phosphorus removal, and the problem of secondary pollution does not appear.