Does the circulating water quality meet environmental discharge standards?
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This post was last edited by cdpulin on 2010-6-17 09:35. The drainage outlet of our circulating pool was sampled by environmental authorities once, and excessive levels of total phosphorus were detected; we are facing penalties as a result. What I would like to ask is: 1. How do you handle the discharge of recycled water, and what are the environmental requirements in this regard? 2. Can the phosphorus content issue be addressed in the formulation of water treatment agents? If not, wastewater must be discharged at appropriate times to increase the concentration ratio. I hope friends who are familiar with the sea can offer some guidance.
Since most current formulations for circulating water treatment are phosphonate-based, either organic phosphons or inorganic phosphorus, with the former being more common. Moreover, the control limit for phosphorus is generally between 2 and 4, or even higher; therefore, the wastewater from circulating water needs to be sent to a wastewater treatment system for phosphorus removal. Phosphorus-free scale inhibitors are still viable; as far as I know, there aren’t many applications for them at present, but with increasing environmental regulations, the market prospects for phosphorus-free scale inhibitors are good.
Moderator: Which is more expensive, phosphorus-free water treatment agents or those that contain phosphorus? Are there any data for comparing the treatment effects? Could the moderator please provide some materials for us to study?*
We produce chlor-alkali products, so excess chlorine water is fed into the circulation tank to remove impurities from the circulating water
Reply to 3# jiangzhen2009: The cost of using phosphorus-free scale inhibitors is higher than that of phosphorus-containing scale inhibitors. At concentration ratios of 3 to 5 times, the costs of the two types are similar; however, at higher concentration ratios, organic phosphonates are more effective than phosphorus-free agents. Phosphorus-free scale inhibitors are primarily expensive due to the high costs of their raw materials, and a slightly higher dosage is required. Additionally, because some of the production technologies used in China are not highly advanced, the quality of these products can be substandard.
The chlorine water obtained from the chlorine gas washing is fed into a circulation tank to remove impurities from the circulating water, achieving excellent results while saving costs
There are discharge standards for circulating water quality. Production-oriented enterprises generally have corresponding wastewater treatment systems; those without such systems must comply with the standards anyway. For the specific details, please refer to the relevant national standards; no further explanation is given here. Currently, high concentration levels are used for circulating water treatment both domestically and internationally; this helps save energy and reduce costs, but it makes water quality treatment increasingly difficult. Regarding phosphorus content, it depends on specific requirements and water quality; there are phosphonate-based and non-phosphonate agents available. Among them, phosphine-based formulations are the most common, which are further divided into organic phosphines and inorganic phosphines, with organic phosphine-based ones being the predominant type. Phosphine-free versions are much more expensive than those based on phosphines! It is best for emission standards to be below 3 units.