Tag: solid waste management

The most convenient reusable wastes are old newspapers because you can get them anywhere and they are not a hazard to the environment. So, the correct answer is "Old newspapers".

Cement manufacturing mainly solid waste include clinker production and spoil rocks, which are removed from the raw materials during the raw meal preparation. Kiln dust and fly ash from power plant also included in solid waste. Another waste is generated from plant maintenance like used oil and metal scrap. So, the correct answer is "True".

The old, dilapidated mobile phone you replaced with a snazzy, up-to-date version was disposed of properly at the company’s collection centre. You think it has been discarded in an environmentally friendly way. But often that does not happen. Worse, it can contribute to the losses the country makes on account of electronic waste, or e-waste. Mobile phones have precious metals such as gold, silver and palladium; special metals such as cobalt, indium and antimony; and metals such as copper and tin. So, the correct answer is "True".

When garbage such as leftover food, fruit and vegetable peels, paper and animals waste is collected in heaps, decomposers such as bacteria, insects such as earthworms and fungi act on it and break it down as these components are organic in nature. This product which is formed by this action of decomposers is called compost. This process is called composting and the compost can be used to increase the plant yield. Thus the correct answer is option A.

Reducing solid waste involves the '3Rs' (Reduce, Reuse, Recycle). Reusing plastic bags, boxes, and containers are all effective ways to minimize the amount of waste generated.

Mechanical composting devices accelerate the stabilization process through forced aeration and controlled conditions. The timeframe of 3-6 days is a reasonable estimate for accelerated composting systems, compared to traditional methods that take weeks. The question contains a spelling error - 'compositing' should be 'composting'.

Incineration is the process of burning solid waste at high temperatures. This method reduces the volume of waste significantly.

Uncontrolled dumping is indeed the cheapest method of solid waste disposal as it requires minimal infrastructure or processing. Chemical waste and nuclear waste require specialized, expensive handling. Food waste is too narrow a category. The sentence structure is grammatically poor.

In the hierarchy of solid waste management, the first step is typically generation or collection, followed by processing (such as sorting or treatment) before final disposal.