CN101216925A - A feasibility judging method on the recycling of tailwater of chemical industrial park - Google Patents

Abstract

The invention provides a feasibility judgment method for reutilizing tailing water of chemical industry parks. The invention respectively provides judgment steps for reutilization feasibility of tailing water of chemical industrial industry parks technically and economically in terms of system, process and enterprises; and the steps includes (1) metabolism of system water resources; (2) technical feasibility analysis in terms of process; and (3) economical feasibility analysis in terms of enterprises. The invention ensures practical operability of tailing water reutilization scheme, and application of the invention can greatly improve utilization efficiency of water resources in the industry parks so as to facilitate realization of zero discharge of waste water.

Description

Chemical industry garden tail water reuse feasibility method of discrimination

Technical field

The present invention relates to the feasibility method of discrimination of chemical industry garden tail water reuse scheme, is exactly the method that the technical feasibility and the economic feasibility of chemical industry garden tail water reuse scheme are carried out objective evaluation and differentiation specifically.

Background technology

Now, developing ecology industry and construction ecological Industrial Area have become the important channel that China implements recycling economy strategy, constructing environment friendly type society and realizes target for energy-saving and emission-reduction.Since the nineties in 20th century, the ecological Industrial Area construction has just begun to become the theme of world industry garden development field, and has obtained comparatively rich experience.Yet, because the weak and disappearance of Ecological Industrial and eco industrial park basic theory and method, cause the ecological Industrial Area construction in the reality to rest on the planning stage more, relevant programme is difficult to put into practice, this is that the risk that scheme puts into practice is too big because the complicacy of ecological Industrial Area self causes the uncertainty of programme too big on the one hand; Be because these planning all also lack the theory and the method for science to be instructed on the other hand, all be the subjective judgement that the planning personnel by virtue of experience makes basically, thereby make relevant programme in reality, lack economic feasibility and technical feasibility.

At the variety of problems that exists in the Ecological Industrial planning in the reality, expert and scholar have successively carried out a series of fundamental researches both at home and abroad, all in all, can be subdivided into following field: industrial symbiosis mechanism and stability, infrastructure shared mechanism, energy cascade utilization technology, material cycle are utilized technology etc.Yet, when developed countries proposes the industrial symbiosis notion at first, its industrial economy has reached a higher level, the energy resource utilization ratio of industrial ecology system is all higher relatively, the pollutant emission intensity of unit industrial output is lower, be used to realize that by the waste exchange between enterprise/industry enterprise/industry wastes reduction or zero-emission are optimum relatively economic policies and means in this case, therefore, " Ecological Industrial " is to wish to realize the closed cycle of industrial system material and the cascade utilization of energy by the association of setting up between enterprise abroad at first, this specific background has stayed the branding of " regeneration of secondary product " to Ecological Industrial, though and its research afterwards enlarges on intension to some extent, research object and category do not change basically.

Ecological Industrial research of China and practice then present three kinds of trend: the one, " the leading opinion of technology ", mainly be to emphasize that enterprise's clearer production technology, waste recovery and recirculating technique, waste resource exchange utilize the exploitation of technology, substitution of resources technology etc., and utilize these technology to make up that waste exchange utilizes network between enterprise/industry, and then realize to improve the utilization ratio of energy resource and reduce the purpose of disposal of pollutants, that support this judgement mainly is technician in industry engaged in trade cleaner productions such as chemical industry, metallurgy, iron and steel, petrochemical industry; The 2nd, " the leading opinion of management ", it mainly is the operation management of emphasizing the industrial symbiosis network, think by deepen the understanding, tighten management, reinforcement cooperation between enterprises can reach the purpose that economizes on resources and reduce pollution, that support this judgement mainly is the scientific research personnel who originally was engaged in management, environmental policy, environmental economy research.These two kinds of judgements have all proposed to analyze and optimize the thinking and the method for industrial symbiosis network from separately knowledge background and position visual angle, but because the complicacy and the diversity of system cause in the reality all not fully up to expectations according to these two kinds of thinking ecological Planning industrial symbiosis system schemas.Though also have some scholars once to attempt two kinds of thoughts are merged,, all also do not get a desired effect because no matter the restriction of objective condition is research aspect or level of practice.

As making up the industrial symbiosis network and building one of important content of ecological Industrial Area, water resource is recycling to be one of the core content be concerned about of industrial ecology expert and scholar and the target dreamed of always.Why with water cycle as the target that realizes the regional water regulation and control, be because operation in the different enterprises in industrial park and process are discrepant to the demand of water resource, this is just for making up between enterprises, the enterprise and even big regional water circulation system provides possibility.All in all, the water resource study on regulation of industrial park aspect mainly concentrates between enterprises, the enterprise and integrated three aspects, garden: the research of enterprise level is based on water reuse in the water resource saving utilization of single enterprise and the enterprises more, the water circulation system research that began afterwards between enterprise changes, and presents the global optimization transition trend to the garden aspect recently again.Yet, in research and practice, find, because the uncertainty of chemical industry garden tail water reuse is bigger, and " waste water recycling " still can not generally be accepted in the heart of the entrepreneur's, add that present China water resource price is generally lower, can't be for the reuse of chemical enterprise tail water provide cost advantage from the cost, therefore, correlative study all is limited in the laboratory basically.Recent years, develop rapidly along with Computer Simulation and analogue technique, utilize computer modeling technique that the industrial park water circulation system is simulated and become a kind of a kind of effective ways and means of evading the programme risk and seeking water cycle mechanism, developed industrial park water cycle model based on GIS as Nobe1, Keckler and Allend have developed the industrial park material circulating system model based on water cycle.In general, though the research about the garden water circulation system has had analogy model to occur, but generally be based on the model of enterprise level, this model since be not deep into supply and demand water basic microscopic units---the operation aspect is considered its technical feasibility, just do not consider the otherness of various microscopic units, more do not consider the economic feasibility of various schemes on enterprise level, therefore water quality requirement, though model is many, defective also is apparent.

With regard to wastewater from chemical industry, basically all be to adopt chemical precipitation method, coagulant sedimentation, absorption method, ion exchange process, electrocoagulation and hyperfiltration etc. at present, more be the group technology that adopts above several technology in fact in the reality, but the correlative study of reuse technology that relates to such waste water of chemical industrial park does not appear in the newspapers as yet.

Summary of the invention

1. invent the technical matters that will solve

The problem that exists in the utilization at chemical industry garden tail water; the invention provides a kind of chemical industry garden tail water reuse feasibility method of discrimination; this method can solve the technical feasibility and the economic feasibility of chemical industry garden tail water design proposal in the reality, thereby guarantees the science and the exploitativeness of chemical industry garden tail water reuse scheme.

2. technical scheme

Chemical industry garden tail water reuse feasibility method of discrimination, its step comprises:

The first step: system water resource metabolism

Guarantee the technical feasibility of tail water reuse scheme between the enterprise, at first to carry out the water resource metabolic analysis to chemical industry garden system, not only to consider the water resource flow in the analytic process, also to consider the water quality and the various component concentrations of each input and output water resource, promptly, each enterprise is subdivided into the micro unit (one or several operation) that independent water resource input is arranged one by one to all need water and draining enterprise to decompose in the chemical industry garden.

On this basis, the water quality and the water yield of each micro unit input water resource are monitored, set up each micro unit input water resource attribute database.Database mainly comprises following field: the acceptable concentration change scope of each solute etc. in each solute concentration, the micro unit input water resource in micro unit numbering, micro unit title, the micro unit input water yield, the micro unit input water resource.

Second step: the technical feasibility analysis of operation aspect

Though the tail water reuse of chemical industry garden aspect seems and occurs between the enterprise, in fact but be between two or more operations of some or a plurality of enterprises, to carry out, for example first enterprise utilizes the tail water of chemical industry garden, certain that is actually the first enterprises together or a few procedure can reuse tail water, and can not be that all need water conservancy project prefaces of first enterprise can reuse tail water.Therefore, determine the technical feasibility of chemical industry garden tail water reuse, will determine that in fact exactly tail water water quality can satisfy the water quality requirement of which operation in those enterprises in the chemical industry garden.

At first, by stirring mixing method the tail water of intending reuse is carried out the water quality homogenising and handle, and mixed tail water water quality is monitored, determine the concentration of main solute in the tail water.Secondly, input water resource database information and the tail water water quality information of the micro unit that the first step is screened compare, and determine that main solute concentration is in which micro unit is imported the solute concentration the accepted scope of water resource in the tail water.If the main solute concentration of tail water is in the solute concentration the accepted scope of a certain micro unit input water resource solute, say that then this micro unit can reuse tail water, also be that tail water is back to use this micro unit feasibility that possesses skills, otherwise it is technical infeasible to claim that tail water is back to use this micro unit scheme.

The 3rd step: the economic feasibility analysis of enterprise level

In the economic feasibility of chemical industry garden tail water reuse scheme, be based on enterprise level, that is to say that the economic feasibility analysis of tail water reuse scheme must be based upon on enterprise's yardstick.Promptly for a certain enterprise, may simultaneously and between other enterprise one or several technical feasible tail water reuse schemes be arranged, yet, the cost one performance analysis result of different schemes then has very big difference, for enterprise, what need to consider is the benefit of whole enterprise but not the benefit of some schemes, that is to say that a certain tail water reuse scheme perhaps realizes that it is infeasible economically when carrying out single cost-performance analysis, but, if its relevant tail water reuse scheme with other is combined when considering and may find, overall tail water reuse scheme is economically viable, and this scheme occupy indispensable effect in global schema, and Here it is based on the foundation of business economic feasibility analysis.

Feasible technically tail water reuse scheme will be implemented in reality, must relate to the transaction issues between tail water discharging enterprise and the reuse enterprise, in case transaction takes place, the financial cost of tail water reuse scheme just produces between tail water discharging and reuse enterprise, and the model structure of chemical industry garden tail water reuse scheme economic feasibility scoring model as shown in Figure 2.

The individual tail water discharging of total M (M 〉=j 〉=1) enterprise in the model structure shown in Figure 2, the individual tail water reuse of N (N 〉=i 〉=1) enterprise.Exist L (L 〉=k 〉=1) to plant reuse (trust-agency) business between tail water discharging (trust) j of enterprise and reuse (agency) i of enterprise.Obviously, from model structure shown in Figure 1 as can be seen, chemical industry garden tail water reclaiming system can be disassembled and be the relation between single tail water discharging enterprise and the single tail reuse enterprise, and then is subdivided into the relation of having only a kind of reuse scheme between a tail water discharging enterprise and the tail water reuse enterprise.And the reuse cost of this moment mainly contains three parts composition: effluent storage cost, moving costs and reuse cost.

Suppose t sometime ₀The time tail water discharging enterprise and reuse enterprise the tail water memory space be respectively Q ₁ ⁰And Q ₂ ⁰, the carrying cost of unit interval unit's tail water is r ₁And r ₂, the tailwater quantity that is transported to reuse enterprise from tail water discharging enterprise in the unit interval is q, and it is w that unit tail water is carried cost, and unit tail water Treatment for Reuse cost is ζ.Then from t ₀Begin arbitrary time t (t 〉=t ₀) tail water reuse total expenses can be expressed as:

$C_{\mathrm{dt}}=({\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="S200710191994XE00011.png"\; state="\{\{state\}\}">Q</figure-callout>}}_1^0+{\mathrm{<figure-callout\; id="1"\; label="v"\; filenames="S200710191994XE00011.png"\; state="\{\{state\}\}">v</figure-callout>}}_1\&CenterDot;\mathrm{dt}-q\&CenterDot;\mathrm{dt}){\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="S200710191994XE00011.png"\; state="\{\{state\}\}">r</figure-callout>}}_1+q\&CenterDot;w\&CenterDot;\mathrm{dt}+(Q_2^0+q\&CenterDot;\mathrm{dt}-v_2\&CenterDot;\mathrm{dt})r_2+v_2\&CenterDot;\mathrm{\&zeta;}\&CenterDot;\mathrm{dt}$

The transposition integration gets:

$C=(Q_1^0{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="S200710191994XE00011.png"\; state="\{\{state\}\}">r</figure-callout>}}_1+Q_2^0{r}_2)(t-t_0)+{\&Integral;}_{t_0}^t(v_1{r}_1-\mathrm{<figure-callout\; id="1"\; label="q\; r"\; filenames="S200710191994XE00011.png"\; state="\{\{state\}\}">q</figure-callout>}{r}_{}{}_1+\mathrm{qw}+q{r}_2-v_2{r}_2+v_2\mathrm{\&zeta;})\mathrm{dt}---\left(1\right)$

Can know that from model structure shown in Figure 2 and assumed condition thereof chemical industry garden tail water reuse scheme total expenses is to be expressed as:

$C_{\mathrm{total}}^{\mathrm{network}}=\mathrm{\&Sigma;\&Sigma;\&Sigma;}{C}_{i,j,k}^{\mathrm{two}-\mathrm{point}}---\left(2\right)$

In the formula (2): C _Total ^NetworkBe chemical industry garden tail water reuse scheme total expenses;

C _{I, j, k} ^Two-pointIt is the cost that (tail) water reuse enterprise accepts (tail) water scheme in the k essential elements of (tail) water discharging enterprise in j among the i.If further establish:

W: chemical industry garden tail water discharging enterprise;

D: chemical industry garden tail water reuse enterprise;

M: chemical industry garden tail water discharging enterprise number;

N: chemical industry garden tail water reuse enterprise number;

L: the item number of reuse scheme between chemical industry garden tail water discharging enterprise and the reuse enterprise;

T: time, Q _{I, j, k} ^W: t ₀Tail water discharges the k class tail water tank farm stock of j of enterprise and the i of reuse enterprise constantly;

Q _{I, j, k} ^D: t ₀The tail water reuse i of enterprise admits the k class tail water tank farm stock of the discharging j of enterprise constantly;

γ _{I, j, k} ^W: the unit carrying cost of the k class tail water of tail water discharging j of enterprise and the i of reuse enterprise;

γ _{I, j, k} ^D: the tail water reuse i of enterprise admits the unit carrying cost of the k class tail water of the discharging j of enterprise;

v _{I, j, k} ^W: the tail water discharging j of enterprise supplies with the unit interval generation of the k class tail water of the reuse i of enterprise;

v _{I, j, k} ^D: the tail water reuse i of enterprise is to receiving the unit interval reuse amount of the k class tail water that discharges the j of enterprise;

q _{I, j, k} ^WQ: the operational throughput from the tail water discharging j of enterprise to the k class tail water of the i of reuse enterprise in the unit interval;

ω _{I, j, k} ^WD: the unit from the tail water discharging j of enterprise to the k class tail water of the i of reuse enterprise carries cost;

ζ _{I, j, k} ^WD: the tail water reuse i of enterprise is from the processed in units cost of the k class tail water of the discharging j of enterprise admittance;

C _T: chemical industry garden tail water reuse scheme total cost;

P _{I, j, k} ^D: tail water reuse enterprise resilience power;

ξ _{I, j, k} ^WD: the maximum transmission capacity of the k item tail water of tail water discharging i of enterprise and the j of reuse enterprise.

Then each parameter is brought into formula (2), obtains expense in the chemical industry garden tail water reuse scheme:

$C_T=\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{j-1}{\overset{M}{\mathrm{\&Sigma;}}}\underset{K=1}{\overset{L}{\mathrm{\&Sigma;}}}(Q_{i,j,k}^W\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^W+Q_{i,j,k}^D\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^D)(t-t_0)$

$+\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{j-1}{\overset{M}{\mathrm{\&Sigma;}}}\underset{K=1}{\overset{L}{\mathrm{\&Sigma;}}}{\&Integral;}_{t_0}^t(v_{i,j,k}^W\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^W-q_{i,j,k}^{\mathrm{WD}}\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^W+q_{i,j,k}^{\mathrm{WD}}\&CenterDot;{\mathrm{\&omega;}}_{i,j,k}^{\mathrm{WD}})$

$+q_{i,j,k}^{\mathrm{WD}}\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^D-v_{i,j,k}^D\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^D+v_{i,j,k}^D\&CenterDot;{\mathrm{\&zeta;}}_{i,j,k}^{\mathrm{WD}})\mathrm{dt}---\left(3\right)$

I in the formula (3), j, k is positive integer, and satisfies: 1≤i≤N, 1≤j≤M, 1≤k≤L, $0<v_{i,j,k}^D{\&le;}_{i,j,k}^D,$ $0\&le;q_{I,J,K}^{\mathrm{WD}}\&le;{\mathrm{\&xi;}}_{i,j,k}^{\mathrm{WD}}.$

More than in the 3rd step feasibility scoring model structure based on following assumed condition:

1) this model is only considered between discharge of wastewater and the reuse enterprise and waste water recycling relevant cost, and does not consider the expense of other business activity;

2) the cost difference of the various waste water mode of movements of supposition is little, does not promptly consider the influence of the difference of tail water mode of movement to total expenses;

3) course of conveying of supposition from tail water discharging enterprise to tail water reuse enterprise is continuous;

4) tail water of enterprises carries pricing in carrying cost;

5) this model not detailed consideration tail water reuse business processes mode and various processing mode processing power and actual treatment amount to the influence of total reuse cost;

6) this model does not consider to generate the fresh water resources costs of tail water.

Variation range for solute concentration in each micro unit input water resource is generally determined in the following way: do the test of solute concentration and product quality influence relation, be horizontal ordinate then with the solute concentration, do ordinate with the product quality situation of change, change solute concentration one product quality change curve, as shown in Figure 2.

Among Fig. 2, increase along with solute concentration, product quality changes and reduces earlier afterwards to increase, generally speaking, product quality changes and must be controlled in certain scope, just among Fig. 2 in the E point, therefore, cross the E point and make the transverse axis line, with curved intersection in a C and the some D, the distance between transverse axis coordinate A, the B of C, D correspondence is the variation range accepted of solute.

3. beneficial effect

The invention discloses chemical industry garden tail water reuse feasibility method of discrimination, the present invention analyzes and proves chemical industry garden tail water reuse feasibility from technology and economic two aspects respectively, thereby guaranteed the real operability of tail water reuse scheme, application of the present invention will improve the chemical industrial park water resource utilization efficiency greatly, help to realize waste water zero emission.

Figure of description

Fig. 1 is that chemical industry garden tail water reuse scheme feasibility is passed judgment on block diagram;

Fig. 2 is solute concentration-product quality change curve;

Fig. 3 is a chemical industry garden tail water reuse economic feasibility scoring model structural drawing.

Fig. 4 is selected printing and dyeing enterprise process flow diagram.

Embodiment

Further specify the present invention with embodiment below, the test of carrying out with printing and dyeing industry garden, Jiangsu here is that example is carried out the application process explanation.

This printing and dyeing chemical industrial park chief engineer has 25 tame printing and dyeing enterprises, the dyeing waste water total emission volumn is 200,000 tons/day, each enterprise's dyeing waste water is handled by the pre-service facility of this enterprise, reach that the sewage-farm, industrial park requires connect the net water quality standard after enter sewage network, enter advanced treatment of wastewater factory and handle, the tail water up to standard after the processing drains into peripheral water body (river).

First one: system water resource metabolic analysis

Because the similarity of printing and dyeing enterprise technology, cause the metabolic analysis analytic process to have very strong comparability, be simple and convenient process, here only to wherein one the family a larger tame printing and dyeing enterprise carry out the water resource metabolic analysis, the technological process of this printing and dyeing enterprise is as shown in Figure 4.

Main processes is: grey cloth is after sample is confirmed color, and after registration was produced the rice number, the dye gigging staining jar was advanced in clot, carry out destarch, decrement pre-treatment, residual alkali is removed in rinsing then, adds color additive, dyes under process conditions, dye complete, after opening cylinder sample being met, abandon water at the bottom of the dye bath, add water washing, clot goes out cylinder, send the typing workshop to get finished product.

Know through investigation and analysis and each material concentration-product quality variation test, 5500 tons of this enterprise's waters every day, its main need water supply and demand has: alkali decrement workshop, O type workshop, overflow workshop, M141 workshop and normal temperature dye gigging workshop, its daily water consumption are respectively 700 tons, 1400 tons, 2500 tons, 700 tons and 200 tons.Each workshop water water quality requirement sees the following form 1.

Each needs water conservancy project preface water quality requirement table 1

The operation title	Index	Indication range
			Alkali decrement workshop	Total hardness is (with CaCO 3Meter)	≤150mg/L
Colourity (extension rate)	≤25
		pH		6.5-8.5
Transparency	≥25cm
		SS		≤30mg/L
Iron	≤0.1mg/L
		Manganese		≤0.05mg/l
O type workshop	Total hardness is (with CaCO 3Meter)				≤200mg/L
		Colourity (extension rate)	≤25
	pH			6-8
		Transparency	≥25cm
	SS			≤30mg/L
		Iron	≤0.1mg/L
	Manganese			≤0.05lmg/l
		The overflow workshop	Total hardness is (with CaCO 3Meter)		≤450mg/L
Colourity (extension rate)	≤25
			pH	6-9
Transparency	≥25cm
			SS	≤30mg/L
Iron	0.2～0.3mg/L
			Manganese	≤0.25mg/l

The M141 workshop	Total hardness is (with CaCO 3Meter)	≤100mg/L
			Colourity (extension rate)	≤25
	pH	≥9
			Transparency	≥25cm
	SS	≤30mg/L
			Iron	≤0.2mg/L
	Manganese	≤0.1mg/l
			Normal temperature dye gigging workshop	Total hardness is (with CaCO 3Meter)	≤350mg/L
Colourity (extension rate)	≤25
		pH		≤6
Transparency	≥25cm
		SS		≤30mg/L
Iron	≤0.05mg/L
		Manganese		≤0.1mg/l

Second step: technical feasibility analysis

Know that through monitoring analysis printing and dyeing chemical industry garden tail water water-quality guideline is as shown in table 2.

Table 2 printing and dyeing chemical industry garden tail water water quality situation

Index	Indication range
		Total hardness is (with CaCO 3Meter)	≤150mg/L
Colourity (extension rate)	≤25
		pH	6.5-8
Transparency	25～30cm
		SS	≤30mg/L
Iron	0.25mg/L
		Manganese	0.1～0.2mg/l

The technical feasibility analysis is exactly that water-quality guideline that tail water is all and each need the water water quality corresponding index between waterwheel to contrast one by one, if whole water-quality guideline of tail water are in the need water index acceptable concentration scope of a certain operation, claim that then tail water can be by this workshop reuse, also being about to tail water, to be back to use this operation be feasible technically, otherwise be called technical infeasible scheme.Each needs between waterwheel water-quality guideline to contrast situation with the tail water water-quality guideline and marks 3 as follows in this research.

Table 3 tail water water-quality guideline and each workshop need the contrast of water water quality requirement

The operation title	Index	The water-quality guideline scope	Tail water water quality	Whether tail water can reuse
					Alkali decrement workshop	Total hardness is (with CaCO 3Meter)	≤150mg/L	≤150mg/L	√
Colourity (extension rate)	≤25	≤25	√

	pH	6.5-8.5	6.5-8	√
					Transparency	≥25cm	25～30cm	√
	SS	≤30mg/L	≤30mg/L	√
					Iron	≤0.1mg/L	0.25mg/L	×
	Manganese	≤0.05mg/l	0.1～0.2mg/l	×
					O type workshop	Total hardness is (with CaCO 3Meter)	≤200mg/L	≤150mg/L	√
Colourity (extension rate)	≤25	≤25	√
				pH		6-8	6.5-8	√
Transparency	≥25cm	25～30cm	√
				SS		≤20mg/L	≤30mg/L	×
Iron	≤0.1mg/L	0.25mg/L	×
				Manganese		≤0.2mg/l	0.1～0.2mg/l	√
The overflow workshop	Total hardness is (with CaCO 3Meter)	≤450mg/L	≤150mg/L						√
				Colourity (extension rate)	≤25	≤25	√
	pH	6-9	6.5-8					√
				Transparency	≥25cm	25～30cm	√
	SS	≤30mg/L	≤30mg/L					√
				Iron	0.2～0.3mg/L	0.25mg/L	√
	Manganese	≤0.25mg/l	0.1～0.2mg/l
				The M141 workshop	Total hardness is (with CaCO 3Meter)	≤100mg/L	≤150mg/L		√
Colourity (extension rate)	≤25	≤25	√
					pH	≥9	6.5-8	×
Transparency	≥25cm	25～30cm	√
					SS	≤30mg/L	≤30mg/L	√
Iron	≤0.2mg/L	0.25mg/L	×
					Manganese	≤0.1mg/l	0.1～0.2mg/l	×
Normal temperature dye gigging workshop	Total hardness is (with CaCO 3Meter)	≤350mg/L	≤150mg/L						√
				Colourity (extension rate)	≤25	≤25	√
	pH	≤6	6.5-8					×
				Transparency	≥25cm	25～30cm	√
	SS	≤30mg/L	≤30mg/L					√
				Iron	≤0.05mg/L	0.25mg/L	×
	Manganese	≤0.1mg/l	0.1～0.2mg/l					×

Can know from table 3 comparing result, with regard to these printing and dyeing chemical industry garden tail water water quality and selected printing and dyeing enterprise, tail water water quality only satisfies the need water water quality requirement in this printing and dyeing enterprise overflow workshop, and also being about to the reuse scheme that tail water is back to use this printing and dyeing enterprise overflow workshop is feasible technically.

The 3rd step: economic feasibility analysis

Can know from the analysis in second step, printing and dyeing chemical industry garden tail water can be back to use the overflow workshop of this printing and dyeing enterprise, the total water requirements in overflow workshop is 2500 tons/day, but because the irreplaceable water yield of being brought by a last operation has 1000 tons/day, therefore, the maximum reuse tailwater quantity of overflow workshop every day is 1500 tons.

In present case, have only tail water generation enterprise's (being sewage treatment plant), a tail water to utilize enterprise's (i.e. this printing and dyeing enterprise), a kind of cooperative business (being the tail water utilization), tail water through pipeline transportation to printing and dyeing enterprise after direct reuse after the suitable stop, the cost of each link of reuse is as follows.

Tail water is carried:

Flow: 62.5 tons/hour

Pipe network length: 6000 meters

Unit length pipe network price: 500 yuan/meter (term of life 10 years)

Pipe network laying project expense and other: 1,500,000 yuan

Tail water price: 0.2 yuan/ton

Fresh water price: 1.5 yuan/ton

Sewage treatment plant's discharging tail water need be handed over charges for disposing pollutants: 0.1 yuan/ton

Bring above data into formula (3):

The tail water storage cost of sewage treatment plant every day: 0 yuan

Sewage treatment plant reduces charges for disposing pollutants every day: 150 yuan

Every day is taken out the tail water income by sewage treatment plant: 0.2 * 1500=300 unit

Pipeline is carried the cost of tail water every day: (6000 * 500+1500000)/(10 * 365)=1233 yuan

The fresh water cost is used in printing and dyeing enterprise saving every day: (1.5-0.2) * and 1500=1950 unit

Printing and dyeing enterprise is built tail water regulating reservoir engineering total expenses (comprising land purchase): 6,000,000 yuan

15 years tenure of use of printing and dyeing enterprise tail water regulating reservoir, then:

The total cost of tail water reuse scheme every day is: 1233+6000000/ (15 * 365)=2329 yuan

The total revenue of tail water reuse scheme every day is: 1950+150+300=2400 unit

This shows that the tail water reuse scheme that the tail water in this printing and dyeing chemical industry garden is back to use printing and dyeing enterprise overflow operation is not only feasible technically, and also is feasible economically.Has only 2400-2329=71 unit though adjust the profit of this scheme every day according to financial cost, the infringement that this does not calculate sewage treatment plant and brings to surrounding enviroment owing to reduce the tail water discharging, and the quantitative estimation of having no idea of this part value.

Claims (2)

1. chemical industry garden tail water reuse feasibility method of discrimination, its step comprises:

(A) chemical industry garden system water resource metabolic analysis, with each needs the micro unit that water and draining enterprise are subdivided into has independent water resource to import one by one in the garden, set up each micro unit input water resource attribute database, comprising with the water resource flow, the water quality of input and output water resource and various component concentrations, the acceptable concentration change scope of each solute in the micro unit input water resource;

(B) carry out the technical feasibility analysis of operation aspect, at first, by stirring mixing method the tail water of intending reuse being carried out the water quality homogenising handles, and mixed tail water water quality monitored, determine the concentration of main solute in the tail water, secondly, the input water resource database information and the tail water water quality information of the micro unit of top step are compared, determine that main solute concentration is in the solute concentration the accepted scope of which micro unit input water resource in the tail water, if the main solute concentration of tail water is in the solute concentration the accepted scope of a certain micro unit input water resource solute, say that then this micro unit can reuse tail water, also be that tail water is back to use this micro unit feasibility that possesses skills, otherwise it is technical infeasible to claim that tail water is back to use this micro unit scheme;

(C) carry out the economic feasibility analysis of enterprise level, by following chemical industry garden tail water reuse scheme economic feasibility scoring model, be provided with the individual tail water discharging of M (M 〉=j 〉=1) enterprise, the individual tail water reuse of N (N 〉=i 〉=1) enterprise, exist L (L 〉=k 〉=1) to plant the reuse business between tail water discharging (trust) j of enterprise and reuse (agency) i of enterprise, chemical industry garden tail water reclaiming system can be disassembled and be the relation between single tail water discharging enterprise and the single tail reuse enterprise, and then being subdivided into the relation of having only a kind of reuse scheme between tail water discharging enterprise and the tail water reuse enterprise, the reuse cost mainly contains three parts and forms: the effluent storage cost, moving costs and reuse cost;

Suppose t sometime ₀The time tail water discharging enterprise and reuse enterprise the tail water memory space be respectively Q ₁ ⁰And Q ₂ ⁰, the carrying cost of unit interval unit's tail water is r ₁And r ₂, the tailwater quantity that is transported to reuse enterprise from tail water discharging enterprise in the unit interval is q, and it is w that unit tail water is carried cost, and unit tail water Treatment for Reuse cost is ζ.Then from t ₀Begin arbitrary time t (t 〉=t ₀) tail water reuse total expenses can be expressed as:

$C_{\mathrm{dt}}=(Q_1^0+v_1\&CenterDot;\mathrm{dt}-q\&CenterDot;\mathrm{dt})r_1+q\&CenterDot;w\&CenterDot;\mathrm{dt}+(Q_2^0+q\&CenterDot;\mathrm{dt}-v_2\&CenterDot;\mathrm{dt})r_2+v_2\&CenterDot;\mathrm{\&zeta;}\&CenterDot;\mathrm{dt}$

The transposition integration gets:

$C=(Q_1^0{r}_1+Q_2^0{r}_2)(t-t_0)+{\&Integral;}_{t_0}^t(v_1{r}_1-q{r}_1+\mathrm{qw}+q{r}_2-v_2{r}_2+v_2\mathrm{\&zeta;})\mathrm{dt}---\left(1\right)$

Chemical industry garden tail water reuse scheme total expenses is expressed as:

$C_{\mathrm{total}}^{\mathrm{network}}=\mathrm{\&Sigma;\&Sigma;\&Sigma;}{C}_{i,j,k}^{\mathrm{two}-\mathrm{point}}---\left(2\right)$

In the formula (2): C _Total ^NetworkBe chemical industry garden tail water reuse scheme total expenses;

C _{I, j, k} ^Two-pointBe the cost that (tail) water reuse enterprise accepts (tail) water scheme in the k essential elements of (tail) water discharging enterprise in j among the i, if further establish:

W: chemical industry garden tail water discharging enterprise;

D: chemical industry garden tail water reuse enterprise;

M: chemical industry garden tail water discharging enterprise number;

N: chemical industry garden tail water reuse enterprise number;

L: the item number of reuse scheme between chemical industry garden tail water discharging enterprise and the reuse enterprise;

T: time, Q _{I, j, k} ^W: t ₀Tail water discharges the k class tail water tank farm stock of j of enterprise and the i of reuse enterprise constantly;

Q _{I, j, k} ^D: t ₀The tail water reuse i of enterprise admits the k class tail water tank farm stock of the discharging j of enterprise constantly;

γ _{I, j, k} ^W: the unit carrying cost of the k class tail water of tail water discharging j of enterprise and the i of reuse enterprise;

γ _{I, j, k} ^D: the tail water reuse i of enterprise admits the unit carrying cost of the k class tail water of the discharging j of enterprise;

v _{I, j, k} ^W: the tail water discharging j of enterprise supplies with the unit interval generation of the k class tail water of the reuse i of enterprise;

v _{I, j, k} ^D: the tail water reuse i of enterprise is to receiving the unit interval reuse amount of the k class tail water that discharges the j of enterprise;

q _{I, j, k} ^WQ: the operational throughput from the tail water discharging j of enterprise to the k class tail water of the i of reuse enterprise in the unit interval;

ω _{I, j, k} ^WD: the unit from the tail water discharging j of enterprise to the k class tail water of the i of reuse enterprise carries cost;

ζ _{I, j, k} ^WD: the tail water reuse i of enterprise is from the processed in units cost of the k class tail water of the discharging j of enterprise admittance;

C _T: chemical industry garden tail water reuse scheme total cost;

P _{I, j, k} ^D: tail water reuse enterprise resilience power;

ξ _{I, j, k} ^WD: the maximum transmission capacity of the k item tail water of tail water discharging i of enterprise and the j of reuse enterprise.

Then each parameter is brought into formula (2), obtains expense in the chemical industry garden tail water reuse scheme:

$C_T=\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{j-1}{\overset{M}{\mathrm{\&Sigma;}}}\underset{K=1}{\overset{L}{\mathrm{\&Sigma;}}}(Q_{i,j,k}^W\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^W+Q_{i,j,k}^D\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^D)(t-t_0)$

$+\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}\underset{j-1}{\overset{M}{\mathrm{\&Sigma;}}}\underset{K=1}{\overset{L}{\mathrm{\&Sigma;}}}{\&Integral;}_{t_0}^t(v_{i,j,k}^W\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^W-q_{i,j,k}^{\mathrm{WD}}\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^W+q_{i,j,k}^{\mathrm{WD}}\&CenterDot;{\mathrm{\&omega;}}_{i,j,k}^{\mathrm{WD}})$

$+q_{i,j,k}^{\mathrm{WD}}\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^D-v_{i,j,k}^D\&CenterDot;{\mathrm{\&gamma;}}_{i,j,k}^D+v_{i,j,k}^D\&CenterDot;{\mathrm{\&zeta;}}_{i,j,k}^{\mathrm{WD}})\mathrm{dt}---\left(3\right)$

I in the formula (3), j, k is positive integer, and satisfies: 1≤i≤N, 1≤j≤M, 1≤k≤L, $0<v_{i,j,k}^D{\&le;}_{i,j,k}^D,$ $0\&le;q_{I,J,K}^{\mathrm{WD}}\&le;{\mathrm{\&xi;}}_{i,j,k}^{\mathrm{WD}}.$

2. according to the chemical industry garden tail water reuse feasibility method of discrimination under the claim 1, it is characterized in that the feasibility scoring model meets the following conditions in the step (C):

1) this model is only considered between discharge of wastewater and the reuse enterprise and waste water recycling relevant cost, and does not consider the expense of other business activity;

2) the cost difference of the various waste water mode of movements of supposition is little, does not promptly consider the influence of the difference of tail water mode of movement to total expenses;

3) course of conveying of supposition from tail water discharging enterprise to tail water reuse enterprise is continuous;

4) tail water of enterprises carries pricing in carrying cost;

5) this model not detailed consideration tail water reuse business processes mode and various processing mode processing power and actual treatment amount to the influence of total reuse cost;

6) this model does not consider to generate the fresh water resources costs of tail water.

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