Speech On Waste Water Management

I. INTRODUCTION

1. Waste water

Wastewater is any water that adversely affects the quality of human health. Wastewater is a liquid source of waste from homes, commercial properties and industry or agriculture, often containing some pollutants from mixing water of different sources. Wastewater is often classified as industrial or domestic wastewater.

In waste water, it contains a lot of harmful pollutants liked: lead, manganese, cadmium, zinc and so on. As known, these pollutants are very dangerous when humans or other species consumed or even when exposed to it. These will affect human health and kill aquatic organisms. Many serious health effects including mutations, cancer, organ damage and death are caused by violet dye in large quantities.

Waste water treatment.

Wastewater is a major cause of water pollution. Thus, wastewater treatment is a very important process to overcome water pollution. To remove pollutants, adsorption processes are carried out before discharging waste water out to river by many industries. This is an effective way to remove contaminants from industrial wastewater.

There are two methods of wastewater treatment: chemical / physical treatment & biological treatment: Biological waste treatment uses biological and bacterial substances to decompose waste. Physical waste treatment carries out some chemical reactions or physical processes for treatment.

The adsorption process is classified into two kinds of removal techniques: continuous and batch processes. In batch process, the adsorbents can be used up to maximum capacity. But it is not suitable for industrial uses because of the continuous and large wastewater-producing, which require larger areas to put large reservoirs for treatment. It is expensive and the processes need a lot of times to run.

Therefore, industrial wastewater treatment mainly uses continuous

Thus, the design SRT: θ_x^d=SF* [θ_x^min ]_lim = 15*1.4=21 d

After that, we need to choose the concentration of total suspended solids. Base on the table 2, the value for conventional treatment we choose is 2000 mg/l. The hydraulic detention time for reactor: θ= (θ_x^d)/X_v [X_i^0+Y(S^0-S)(1+(1-f_d )bθ_x^d )/(1+bθ_x^d )]

θ=21/2000[20+ 0.34(60-0)(1+(1-0.8)(0.15)(21))/(1+0.15(21) )]=0.29 d

Volume reactors:

V=Q^0 θ=〖10〗^2 (0.29)=29 m^3

The Concentration of Effluent Substrate:

S=K (1+bθ_x^d)/(θ_x^d (Yq ̂-b)-1)= (1+0.15(21))/(21(0.34(2.5)-0.15)-1)=0.3 mg NH4^+-N/l

The efficiency of ammonia-nitrogen removal of system is:

Removal efficiency = 100 (S^0-S)/S^0 =100 (60-0.3)/60=99.5 %

IV. CONCLUSION

The average removal efficiency of NH4 + -N (99.5%) is therefore much larger than required, providing another level of safety in the design for system. In this case, as with most actual designs, the volume reactor tends to be more governed by the reliability considerations rather than considering the removal