The chemical industry produces usually robust wastewaters that could include harmful contaminants. Typically, organic and inorganic materials are present in variable concentrations, in chemical industry wastes. Acids, bases, poisonous substances, and stuff with a high biological oxygen demand, colour, and low suspended solids content are all present.
The chemical industry uses a lot of poisonous, mutagenic, carcinogenic, or scarcely biodegradable compounds. The chemical industry's usage of surfactants, emulsifiers, and petroleum hydrocarbons, lowers the performance efficiency of numerous treatment unit processes. As a result, CPCB has formulated certain effluent discharge guidelines for the organic chemical manufacturing industries.
Treatment of effluent from organic chemical manufacturing industries
In general, treating extremely toxic and contaminated industrial wastewater at the source, is the optimum course of action, while sometimes onsite treatment within production lines with recycled treated effluent is used. Pretreatment is necessary to create an equal effluent since these wastes have common features, which set them apart from home sewage.
· Some biological oxidation techniques, such as trickling filters, rotating biological contactors (RBC), activated sludge, or lagoons, can be used to treat chemical industrial wastewater.
· Pollutants having a molecular weight of between 10,000 and 20,000 can be treated, using flotation or coagulation, followed by sedimentation.
CPCB Guidelines for Effluent Treatment Plants in organic chemical manufacturing industry
(a) Compulsory parameters
pH |
6.5—8.5 |
BOD (3 days at 27oC) Oil & Grease Bioassay test |
100 mg/l 10 mg/l Minimum 90% survival after 96 hours with at 100% effluent |
(b) Additional parameters (mg/l)
Nitrate (as N) |
10 |
Arsenic |
0.2 |
Hexavalent Chromium |
0.1 |
Total Chromium |
1.0 |
Lead |
0.1 |
Cyanide as CN |
0.2 |
Zinc |
0.5 |
Mercury |
0.01 |
Copper |
2.0 |
Nickel |
2.0 |
OH |
5.0
|
Sulphide
|
2.0 |
Although, there is no set COD limit, it must be monitored. Such industrial entities are expected to identify the chemicals producing the same, if the COD in a treated effluent is consistently greater than 250 mg/l.
How to determine the best method for effluent treatment in organic chemical manufacturing industries?
The most suitable treatment method is determined by the characteristics of chemical industrial wastewater, specifically, the pollutants' concentration, molecular size, solubility, toxicity, and biodegradability.
The concentration and toxicity of chemical industrial pollutants are effectively reduced, by diluting them with domestic sewage in the plant, which also improves the effectiveness of the biological treatment. Additionally, since no chemical salts are needed to deliver nutrients, dilution with sewage is economical.
Conclusion
Before wastewater is applied to land, placed in a natural body of water, or recycled, it must first undergo a multi-stage treatment process. The aim is to reduce or remove organic matter, sediments, minerals, and other pollutants, because each receiving body of water can only hold a certain quantity of pollutants before deteriorating.
Each effluent treatment plant is therefore required to comply with discharge requirements, which are frequently specified by the relevant environmental authority, as allowable levels of pollutants.
Producers of effluent treatment plants for organic chemical manufacturing industries
Please get in touch with the Netsol Water team as soon as possible, if you have any inquiries about effluent treatment plants. Our staff is a leader in wastewater treatment, and we can work with you to customize a plan to meet your needs.
Netsol Water is Greater Noida-based leading water & wastewater treatment plant manufacturer. We are industry's most demanding company based on client review and work quality. We are known as best commercial RO plant manufacturers, industrial RO plant manufacturer, sewage treatment plant manufacturer, Water Softener Plant Manufacturers and effluent treatment plant manufacturers. Apart from this 24x7 customer support is our USP. Call on +91-9650608473, or write us at enquiry@netsolwater.com for any support, inquiry or product-purchase related query.