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Phosphorus Removal

The Rules on Phosphorus in Wastewater Discharge

Phosphorus removal is a bigger issue today than ever before.State laws limit the levels of phosphorusthat can be discharged from wastewater into the environment. Generally, the enforcement of these laws also happens at the state level. Many U.S. states currently regulate, or will soon regulate, these phosphorus levels. Some states are contemplating switching to new, more stringent standards—in some cases as low as 0.1 mg/L. That’s ten times lower than the current standard.

Why All the Fuss About Phosphorus?

Phosphorus is found in almost every fertilizer that is manufactured commercially. After crops are fertilized, the excess nutrients in the fertilizer, like phosphorous, are washed into our watershed.

虽然磷在粮食作物的植物生长增加时非常有效,但它具有dangerous side-effects for state waterways. The issue is, phosphate also promotes eutrophication—the growth of aquatic plants in bodies of water, which includes harmful algal blooms (cyanobacteria). These cyanoHABs can producenoxious toxinsthat are harmful to both humans and animals.

Approaches to Phosphorus Removal in Wastewater

As phosphorus issues persist, regulations that limit levels in wastewater will become more strict. For many treatment facilities, understandinghow to effectively remove phosphorusfrom their effluent might be a challenge, but it is surely possible.

几乎所有废水处理厂至少表现出次要处理,但这通常不提供足够的磷去除。为了满足新的要求,设施可以做两件事中的一种:1)改造其植物以增强生物处理过程,或2)加入化学以帮助沉淀出磷酸盐。Treatment technologies that are presently availablefor removing phosphate include:

Physical:过滤颗粒磷或膜technologies
Chemical:Precipitation or physical-chemical adsorption
Biological:Assimilation or enhanced biological phosphorus removal (EBPR)

Graphic of the new phosphorus removal regulations

Physical Treatment

One approach that works well to nitrify and denitrify wastewater is to retrofit existing wastewater plants with particulate phosphorus membrane technologies; however, this method may lack the intended benefit of phosphate removal. Furthermore, due to the high capital cost of investment required upfront, it may take years to see a return on investment. Over the long term, however, this process can be a cost-effective solution to reduce phosphate levels.

Chemical Treatment

在磷酸盐管理中使用的一种策略长期以来是化学沉淀。虽然这种方法需要低资本成本,但它确实具有持续的治疗费用。使用化学处理在废水中降低磷酸盐水平的益处是它可以立即提供不等待施工(物理溶液)的即时结果。然而,传统化学处理可以增加显着的污泥去除成本;如果使用的方法是在初级处理期间的应用(Tchobanoglous等,2003),则这些成本可能是特别的。二次治疗后的明矾可以产生较少的污泥,但增加仍然可能是一个问题。

Biological Treatment

生物磷酸盐去除可以有效地降低磷酸盐水平;however, its performance varies during the year due to several factors like flow, water, air temperature, etc. There is, nevertheless, some concern about the effects that solids management processes and return side streams may have on a biological treatments’ ability to lower phosphate levels. Any process that destroys organic material (such as digestion) has the potential to release particulate organic phosphate, which is present as soluble organic or inorganic phosphate. Any released phosphate will then be returned to the main wastewater treatment process in high concentrations through recycle side streams; because of this, phosphate removal is required a second time. Processes that are not continuous may also cause variable loadings from side streams.

ATS Innova Phosphate Treatment Plan

In most cases, wastewater plants caneffectively reduce phosphate levels using a smart chemical approach, for a fraction of the cost of infrastructure upgrades. After working with wastewater facilities across the U.S. for over 30 years, ATS Innova has identified certain variables that should be considered in order to dial-in an optimal chemical solution. These factors include the following water attributes:

  • 博士
  • Alkalinity
  • Influent phosphate levels
  • Influent ammonia levels
  • 流水硝酸盐水平
  • Daily plant effluent volume
Graph of PO4 Reduction (Phosphorus Removal) Using ATS-809

When traditional chemicals likealum, ferric, or other productsare not doing enough to lower phosphorus levels, many facilities tend to react by simply dosingmore. All too often, however, this approach merely results in added cost, more sludge, and increased handling costs—among other problems.

Rather than simply dosing more chemical, ATS Innova helps wastewater plants determine the best chemical strategy for phosphate removal at each unique plant. Our water experts first assess current state water dynamics and then analyze the best location(s) for treatment. Specialty, high-performance chemistry solutions will be recommended based on plant variables. Next, we perform bench-scale testing to validate performance. To ensure everything runs smoothly, the ATS team offers support throughout the startup process, as well as safety training for the implemented solution.

领先于磷酸盐调节曲线—Call us today at855.215.4600为您的免费植物分析,并了解如何通过您的设施独特的水动态实现最佳性能。

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