The effectiveness of return sludge in removing undesirable materials from dairy wastewater factories

Milk and dairy products are one of the main sources of food, and the reason that this industry uses a lot of water for production is that the amount of wastewater is large. The use of chemicals and even biological materials to treat these effluents will incur additional costs. This method of recycling the sludge produced in the clarification ponds will yield benefits from several aspects. Reducing costs, on the one hand, reducing the use of chemicals, and then reducing the sludge produced and discharged into the environment. This method will reduce the aluminium used in the treatment and thus its health effects. The recycling of sludge with (50%) of the incoming discharge improves the treatment efficiency. The deviation from this percentage works to create additional brownishness, and this is what happened at (25%) and (75%). The returned particles work with the sludge, bridges and felt work, which increases the removal efficiency at rates that can reach (14%), and this, of course, reduces the amount of aluminium used to achieve the treatment process and can be in the same proportion.