Quantitative application technology for removing and recovering phosphorus from water body with rich phosphorus or sewage using natural mineral

Abstract

The invention provides a quantitative application technology for removing and recovering phosphorus from water body with rich phosphorus or sewage using natural mineral. The technology comprises the following steps: weighting calcite and anhydrite powders with the grain size of 300-500 meshes, mixing according to the weight ratio of 4:1-10:1 and reacting at 30 DEG C for 10h in the solution with the initial phosphorus concentration of 20mg / L-2mg / L. The effective phosphorus-removing empirical formula for 1g of gypsum in the mixed mineral is Pt = (0.5*C-0.3+ / -0.45)mg, wherein the Pt is the effective phosphorus-removing amount for 1g of gypsum and Cis the initial phosphorus concentration of the solution. When the phosphorus-removing effect of the mixed mineral becomes low, anhydrite mineral powder is only needed to add so that the effective phosphorus-removing amount for 1g of gypsum can reach (0.5*C-0.5)-1.9(0.5*C-0.5). The technology can be used for the phosphorus-removing process of the supernatant on the terminal urban sewage treatment, the rural distributed domestic sewage, eutrophic lake water body and large-scale, medium-scale and small-scale eutrophic landscape water body.

Description

technical field [0001] The invention belongs to the field of water pollution control, and particularly refers to a quantitative application method for repeatedly using a mixture of two natural minerals in a specific ratio in the process of phosphorus-rich water or sewage phosphorus removal and phosphorus recovery. Background technique [0002] Phosphorus is the main inducer of water eutrophication, so in the process of dealing with the increasingly serious global eutrophication problem, the first thing to pay attention to is the control of phosphorus. [0003] In developed countries, the treatment of phosphorus in sewage is very important, especially the recovery and utilization of phosphorus in the treatment of industrial wastewater and urban domestic sewage; MgNH 4 PO 4 6H 2 O, commonly known as struvite or MAP) and calcium phosphate technology. For example, the Treviso sewage treatment plant in Italy installed a MAP crystallization recovery device on the sludge dewate...

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Problems solved by technology

[0005] ① The recovery method of ammonium magnesium phosphate and calcium phosphate minerals is mainly used for the recovery of phosphorus in the process of removing phosphorus from industrial wastewater and urban domestic sewage, but it cannot be used for eutrophic water bodies (such as eutrophic lake water bodies, rural distributed domestic sewage, etc.) , phosphorus-rich water in scenic spots) to remove and recycle phosphorus

[0006] ②Phosphorus removal (recovery of phosphorus) in the form of magnesium ammonium phosphate is accomplished by adding chemical reagents such as MgCl. The disadvantage is that the operating cost is very high, and it is required to operate under the background of a relatively high pH value (pH>9) ( This is impossible in natural water bodies)

[0007] ③ Phosphorus removal (recovery of phosphorus) in the form of calcium phosphate is done by adding Ca(OH) 2 , NaOH and other chemical reagents to complete, not only the cost is high, but also the problem of demanding operating conditions, it is difficult to carry out large-scale production and operation of natural phosphorus-rich water

[0008] ④The above methods have not yet achieved real quantitative treatment, and the maturity of the process needs to be further developed

[0009] In my country, many scholars have conducted research on phosphorus removal and phosphorus recycling from different angles, but most of them are still in the laboratory research stage, and lack systematic experimental programs and measures with promotion prospects

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