SEWAGE

SEWAGE C화학적 특성, 용도, 생산

농업용

Sewage is watery material from chemical plants, municipal waste and septic systems. Safe disposal of large quantities of sewage and septage poses an economic problem.
The end products of all sewage treatment processes are sewage sludge and effluents. Both components of sewage are used to increase crop production. Sewage sludge is the solid portion produced during sewage treatment. Sewage effluent is essentially clear liquid, containing low concentrations of plant nutrients and traces of organic matter, which after chlorinating can be used for irrigation purposes. Common methods for disposal of sewage include its burning, burial and composting.
On average, sewage contains 22 ppm, 5 ppm and 15 ppm of NPK, respectively. In addition, it contains micronutrients like Zn, Cu, Fe and undesirable materials like heavy metals (Ni, Cd, Pb). All sewage and septage sludges generated annually would replace only about 1 % , 4% and0.5% N, P, K, respectively. Sewage is allowed to stand in a settling tank or a septic tank to let the heavier portion to settle, and for organic matter to undergo preliminary fermentation and oxidation. This oxidized sludge is called activated sludge which is odorless. It contains 3 to 6% N, 2% P and 1 % K on dry weight basis.
Raw sewage should not be used directly for growing vegetables as it may contain toxic elements and bacteria which are dangerous to health. Treated sewage wastewater can be used on fields and thus plowed back into the soil. Field crops grown with sewage irrigation include: (a) fodder crops like oats, sorghum, maize, (b) sugar cane, and (c) vegetable crops like cabbage, cauliflower, potato, lady's finger, brinjal and leafy vegetables.
Waste material, usually liquid, originating from households (kitchen, bath and washings), but not including urine or feces, is referred to as sullage.

SEWAGE 준비 용품 및 원자재

원자재

준비 용품

SEWAGE 공급 업체

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