Every country has its own regulation which rules the waste disposal to the drain. Why should chemicals not be released in drain? Negligence of these rules will bring much harm and less benefit. Keep in mind to ask your environmental safety officer for comprehensive list of chemicals which can go down to the drain.
The harmful effects of chemical waste are corrosive and toxic. Otherwise, these materials can be sent down to the drain because it has been considered safe based on the research. Why? Because these materials readily ingestible by the microorganism in a water treatment plant.
Here are several lists of organic chemicals which can go down the drain if they meet all the following criteria.
Nonhazardous category means there is no radioactive waste, no hazardous chemical waste, and no untreated biohazardous waste. Nonhazardous waste has a low toxicity and even high water solubility.
Biohazardous waste can be disposed after treated by decontaminating the waste. There are two following methods of decontamination which are suitable for these waste’s drain disposal.
Radioactive chemical list is a list of substances which has an ability to emits radioactive rays more than 0,002 µCi per gram. Radioactive waste which is water soluble and dispersible in water could be disposed down to the drain unless the concentration is less than 200 µCi per laboratory per day. Please keep in mind to maintain Radioactive Material Usage Log for this waste’s disposal record.
This category means there is no solid, muddy, or viscous substances.
Here are several examples of chemicals which are considered safe for drain disposal.
Cations | Anions |
Aluminium | Borate |
Ammonium | Bromide |
Calcium | Carbonate |
Cesium | Chloride |
Lithium | Bisulfite |
Magnesium | Hydroxide |
Potassium | Oxide |
Sodium | Iodide |
Strontium | Nitrate |
Tin | Phosphate |
Titanium | Sulfate |
Zirconicum |
Why? These materials are relatively low in toxicity. Any compounds with these ions which are strongly acidic or basic should be neutralized before removing it down to the drain. The examples of inorganic salts are including drying agents, such as calcium chloride, magnesium sulfate, sodium sulfate.
Corrosive waste with a pH between 2 to 5 could be disposed down to the drain after the pH has been adjusted. It can be done by 2 following options: (a) The pH is adjusted to greater than 5 and less than 12.5 or neutralized to pH 5.5 – 9 range, in order to be disposed down the drain; (b) Non-adjusted waste should be stored and disposed as hazardous chemical waste. Any other chemical compound which is low toxicity and low molecular weight biodegradable organic chemicals such as aldehydes, ketones, amines, ethers, nitriles, esters, and nitroalkanes.
How Much May be Disposed?
Quantities of chemical waste for drain disposal should be limited to a few hundred grams or milliliters or less per day. Larger amounts should have approval first from environmental safety department. The quantities which are considered safe are up to 100 grams or 100 milliliters per discharge. This disposal should be followed by flushing with at least 100-fold excess of water per disposal.
The properties of all these materials can be understood by reading the material safety data sheet (MSDS). Furthermore, if you have any doubt whether a solution can go down to the drain, please contact environmental department officer for further questions.
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