If industrial wastewater entering a treatment works contains toxic components the rate of biodegradation will be inhibited or stop completely. This can result in failed consents and will certainly give rise to operational problems. Visible indications include deflocculation, bulking and the appearance of filamentous bacteria. Sometimes, there are no visible effects. When the sludge bacteria are inhibited, there is the possibility of toxicity carryover in the effluent that is discharged to receiving waters. With...
If toxicity is identified in a mixed sewage entering a treatment works, the problem for the plant manager is to track and identify the source of the toxicity. This can be done by sampling the effluent stream at various points in its length. By working in a logical sequence back up the sewer network the number of samples can be minimised. This type of testing should be rigorously enforced for new product introduction by a waste producer, as well as sampling the effluents directly at source. The samples would be...
In industrial manufacturing companies, before a new process comes on-line, it is important to measure the toxicity of the effluent stream. This is especially the case for companies who treat their own waste. From the toxicity value (EC50) obtained, it may be a cost-effective solution to simply discharge the effluent to the treatment works at a slow and defined rate to minimise damage to the activated sludge. Following a period of acclimatisation it is often possible to increase feed rates to the plant and this...
Water companies, water authorities or publicly-owned treatment works (POTW) need to have some knowledge of the composition of the wastes they it receive. In addition to testing for ammonia and BOD or COD levels, treatment works can license industrial discharges on the basis of concentrations of some of the known toxic compounds. However, it is recognised that very many non-regulated toxic materials still enter the treatment works and reduce the efficiency of biodegradation, and may cause toxic shock. The way is...
Ion exchange resins and synthetic adsorbents can be used in the metal plating industry to remove impurities, allowing recycling of the plating liquor. Treatment of effluents removes toxic metals, allowing safe disposal of the waste liquor.
The water from pharmaceutical companies can cause big troubles because of the high variability in their manufacturing processes. Depending on the kind of raw materials used, the effluents may even be toxic, hence why the most conflictive effluents have to be separated from the rest and not to be sent to the general treatment.
Custom water and wastewater engineering, consulting and process design services to prevent air, land, water and environmental pollution. We rework systems as processes change and troubleshoot where necessary to bring systems into compliance.
• High purity and process water
• Biological nutrient removal
• Solids treatment
• Toxicity reduction
• Industrial treatment
• Advanced oxidation and alternative disinfection
• Effluent reclamation and reuse
• Land application systems
• Natural treatment systems