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  • 如何降低污水中的总磷?
  • 本站编辑:浙江国清环保科技有限公司发布日期:2018-02-22 10:49 浏览次数:

水体中磷的来源

The source of phosphorus in water body

排放到湖泊中的磷大多来源于生活污水、工厂和畜牧业废水、山林耕地肥料流失以及降雨降雪之中。与前几项相比,降雨和降雪中的磷含量较低。有调查表明,降雨中磷浓度平均值低于O.04 mg/L,降雪中低于O.02 mg/L。以生活污水为例,每人每天磷排放量大约在1.4~3.2 g,各种洗涤剂的贡献约占其中的70%左右。此外,炊事与漱洗水以及在粪尿中磷也有相当的含量。工厂磷排放主要来源于肥料、医药、金属表面处理、纤维染发酵和食品工业。在水域的磷流入量中,生活污水占43.4%为比较大, 其他依次为20.5%,29.4%与6.7%,生活污水43.4%工厂和畜牧业废水20.5%肥料流失29.4%降雪降水6.7%。

Most of the phosphorus released into the lake comes from domestic sewage, factory and livestock wastewater, fertilizer loss in mountain forest, and rainfall and snowfall. Compared with the previous several, the phosphorus content in rainfall and snowfall is lower. The investigation shows that the average phosphorus concentration in the rainfall is lower than O.04 mg / L, and it is lower than O.02 mg / L in the snowfall. Taking domestic sewage as an example, per person per day the amount of phosphorus is about 1.4 to 3.2 g, and the contribution of various detergents is about 70% of them. In addition, cooking and washing in water and urine phosphorus also has considerable content. Phosphorus emissions from factories are mainly derived from fertilizer, medicine, metal surface treatment, fiber dyeing and food industry. In the water inflow of phosphorus, the domestic sewage accounts for 43.4% of the total, the rest of which are 20.5%, 29.4% and 6.7%, domestic sewage 43.4% factories and livestock wastewater 20.5%, fertilizer loss 29.4%, snow and rain 6.7%.

废水中磷的形态

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The form of phosphorus in waste water

废水中的磷以正磷酸盐、聚磷酸盐和有机磷的形式存在,由于废水来源不同,总磷及各种形式的磷含量差别较大。典型的生活污水中总磷含量在3~15 mg/L(以磷计);在新鲜的原生活污水中,磷酸盐的分配大致如下:正磷酸盐5 mg/L(以磷计),三聚磷酸盐3 mg几(以磷计),焦磷酸盐lmg,L(以磷计)以及有机磷<lmg,L(以磷计)[”。聚磷酸盐在酸性条件下可以水解为正磷酸盐,大多数生活污水的pH范围在6.5~8.0,温度在lO~20℃,在此条件下水解过程非常缓慢;然而,在污水中细菌生物酶的作用下,可以大大加快水解转化过程:生活污水中的不少缩聚磷酸盐在污水到达处理厂之前已经转变为正磷酸盐。此外,在污水生化处理过程中,所有的聚磷酸盐都被转化为正磷酸盐,没有缩聚磷酸盐能残存下来。同时,在细菌的作用下,污水中的有机磷也部分转化为正磷酸盐。

Phosphorus in wastewater exists in the form of orthophosphate, polyphosphate and organic phosphorus. Due to the different sources of wastewater, total phosphorus and various forms of phosphorus are quite different. The typical life of total phosphorus content in 3~15 mg / L (P gauge); in the fresh raw sewage, phosphate distribution is as follows: 5 mg / L (phosphate phosphorus meter), 3 mg (with tripolyphosphate pyrophosphate, phosphorus meter) LMG, L (P.) and organic phosphorus <lmg, L (P [plan)". Polyphosphate in acidic conditions can be hydrolyzed to orthophosphate, most of the sewage in the range of 6.5 ~ 8 pH, temperature of lO to 20 DEG C, under this condition the hydrolysis process is very slow; however, the bacteria in wastewater of biological enzyme, can greatly accelerate the hydrolysis process of sewage in many condensation: phosphate treatment plant before arrival has been transformed into orthophosphate in wastewater. In addition, in the process of biochemical treatment of sewage, all polyphosphate is converted to orthophosphate, and no polyphosphate can be retained. At the same time, under the action of bacteria, the organophosphorus in the sewage is partly converted to phosphate.

废水除磷方法

The method of removing phosphorus from waste water

电解法脱磷:含PO43-的废水可以用铁作阳极进行电解去除, 在这种情况下, 磷酸盐以Fe3(PO4)2及FePO4的形态被去除, 然后再经阳极进行电解以去除残余的铁离子。含磷废水可用铁~铝作电极进行电解凝聚进行处理。

Electrolysis dephosphorization: wastewater containing PO43- can be removed by electrolysis with iron as anode. In this case, phosphate is removed by the form of Fe3 (PO4) 2 and FePO4, and then electrolyzed by anode to remove residual iron ions. The phosphorus containing wastewater can be treated by electrolytic coagulation with Fe ~ Al as the electrode.

结晶法除磷:就是向已含钙盐的含磷废水中添加一种结构和表面性质与难溶磷酸盐相似的固体颗粒,破坏溶液的亚稳态,在作为晶核的除磷剂上析出羟基钙磷灰石,从而达到除磷目的。

Phosphorus removal by crystallization is to add a solid particle with similar structure and surface properties to that of insoluble phosphate, which destroys the metastable state of the solution, and precipitates hydroxycalcium calcium phosphate on the core as a phosphorus removal agent, so as to achieve the goal of phosphorus removal.

化学法除磷:即投加除磷剂,投加除磷剂后,污水中进行的不仅是沉析反应,同时还发生着化学絮凝作用,即形成的细小的非溶解状的固体物互相粘结成较大形状的絮凝体,通过固液分离,得到净化的污水和固液浓缩物(化学污泥),达到化学除磷的目的。

Chemical dephosphorization: adding phosphorus removal agent, adding phosphorus removal agent, the sewage is not only the precipitation reaction, but also a chemical flocculation, namely non dissolved solids formed fine mutually bonded into large flocs shape, through solid-liquid separation, sewage and solid liquid concentrate obtained purification (chemical sludge), to achieve the purpose of chemical phosphorus removal.

希洁生产的高效除磷剂就属于化学法的一种,那么希洁的产品有什么优势呢?接着往下看:

The high efficient phosphorus removal agent produced by Greek and clean is one of the chemical methods, so what are the advantages of the products of Greek and clean? Then look down.

希洁产品除磷剂:

The dephosphorization agent for the products of Xi Jie:

1、不需要大幅度调节pH

1. There is no need for a large adjustment of pH

2、具有除磷、混凝双重功效,是一种多功能高效除磷剂

2. It has dual functions of phosphorus removal and coagulation, which is a multifunctional and efficient dephosphorization agent.

3、除磷彻底,出水清澈

3, the phosphorus removal is thorough, the water is clear

4、真正的环保型药剂,对人体无害

4. The real environmental protection agent is harmless to the human body

5、一共有3种型号分别针对不同类型的污水可供选择

5. A total of 3 models are available for different types of sewage, respectively.